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- のぶあき ひでやま
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16 [1-1] 1970p.13. [1-2] 1982p.174. [1-3] 2001p.321. [1-4] D. Guerard, A. Herold, Carbon, 13, 337 (1975). [1-5] A. N. Dey, B. P. Sullivan, J. Electrochem. Soc., 117, 222 (1970). [1-6] (1982). [1-7] S. Basu, U. S. Patent (1983). [1-8] (1988). [1-9] S. Yata, H. Kinoshita, M. Komoi, N. Ando, T. Kashiwamura, T. Harada, K. Tanaka, T. Yamabe, Synth. Met., 62, 153 (1994). [1-10] J. R. Dahn, R. Fong, M. J. Spoon, Phys. Rev B, 42, 6424 (1990). [1-11] [1-12] 4(4), 54 (1993). [1-13] K. Mizushima, P. C. Jpones, P. J. Wiseman and J. B. Goodenough, Mater. Res. Bull., 15, 783 (1980). [1-14] C. Delmas, J. J. Braconnier, P. Hagenmuller, Mat Res. Bull, 17, 117 (1982). [1-15] A. Mendiboure, C. Delmas, P. Hagenmuller, Mat Res. Bull, (1984). [1-16] M. G. S. R. Thomas, W. I. F. David, J. B. Goodenough, Mat Res. Bull, (1985). [1-17] E. Plicta, M. Salomon, S.Slane, M. Uchiyama, D. Chua, W. B. Ebnber, H. W. Lin, J. Power Sources, 21, 25 (1987). [1-18] J. J. Anborn, Y. L. Barberio, J. Electrochem. Soc., 134, 638 (1987).
![[1-10] J. R. Dahn, R. Fong, M. J. Spoon, Phys. Rev B, 42, 6424 (1990). [1-11] 15 1992. [1-12] 4(4), 54 (1993). [1-13] K. Mizushima, P. C. Jpones, P. J. Wiseman and J. B. Goodenough, Mater. Res. Bull.](/docs-images/51/20151599/images/page_16.jpg ", 15, 783 (1980). [1-14] C. Delmas, J. J. Braconnier, P. Hagenmuller, Mat Res. Bull, 17, 117 (1982). [1-15] A. Mendiboure, C. Delmas, P. Hagenmuller, Mat Res. Bull, 19 1383 (1984). [1-16] M. G. S. R. Thomas, W.")
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24 Table 2-1 Physical and chemical properties of natural graphite, artificial graphite and coke used in this study Purity Real density Particle size Interlayer spacing Crystallite size (%) (g cm -3 ) (µm) d 002 (nm) along c-axis, Lc (nm) Natural graphite A >100 Natural graphite B >100 Natural graphite C >100 Artificial graphite A Artificial graphite B Coke A Coke B Coke C
25 Table 2-2 Deterioration ratios (%/cycle) of the discharge capacity of type test cells using LiCoO 2 with natural graphite A and with coke A at various cycle periods Cycle periods Natural graphite A Coke A
26 Fig Discharge curves of carbon electrodes at a rate of 0.25 ma cm -2 at 25 C using 1 mol dm -3 LiPF 6 / (EC +DME) as an electrolyte.
27 Fig Discharge curves of carbon electrodes at a rate of 0.25 ma cm -2 at 25 C using 1 mol dm -3 LiPF 6 / (EC +DEC) as an electrolyte.
28 Fig Relationship between specific surface area of carbon materials and initial charge/discharge efficiency.
29 Fig Charge/discharge cycle performance of type test cells using LiCoO 2 and natural graphite A and coke A at a charge/discharge current of 0.2 A.
30 Fig Discharge curves of (a) natural graphite, (b) coke, and mixtures of graphite and coke: (c) natural graphite/coke = 8/2, (d) natural graphite/coke = 7/3, (e) natural graphite/coke = 6/4, (f) natural graphite/coke = 5/5, and (g) natural graphite/coke = 2/8 at a rate of 0.25 ma cm -2 at 25 C.
31 Fig Discharge curves of type test cells using LiCoO 2 and (a) natural graphite, (b) coke and (c) mixture of graphite and coke (natural graphite/coke = 8/2) at a discharge rate of 0.2 A.
32 Fig Charge/discharge cycle performance of type test cells using LiCoO 2 and (a) natural graphite, (b) coke and (c) mixture of graphite and coke (natural graphite/coke = 8/2) at a discharge rate of 0.2 A.
33 [2-1] T. Hazama, M. Miyabayashi, H. Ando, R. Ishikawa, S. Furuta, H. Ishihara and J. Shonaka, J. Power sources, 54, 306 (1995). [2-2] R. Kanno, Y. Takeda, T. Ichikawa, K. Nakanishi and O. Yamamoto, J. Power sources, 26, 535 (1989). [2-3] M. Mohri, N. Yanagisawa, Y. Tajima, H. Tanaka, T. Mizuki and H. Wada, J. Power sources, (1989). [2-4] N. Imanishi, S. Ohashi, T. Ichikawa, Y. Takeda and O. Yamamoto, J. Power sources, 39, 185 (1992). [2-5] B. Scrosati, J. Electorchem. Soc., 139, 2776 (1992). [2-6] M. Fujimoto, K. Ueno, T. Nohma, M. Takahashi, K. Nishio and T. Saito, Proceedings of the symposium on new sealed rechargeable batteries and supercapacitors, [2-7] H. Kurokawa, T. Nohma, M. Fujimoto, T. Maeda, K. Nishio and T. Saito, Ext. Abst. of the International Workshop on Advanced Batteries, Japan, [2-8] T. Maeda, H. Kurokawa, M. Fujimoto T. Nohma and K. Nishio, Ext. Abst. of 36th Meet. Battery Symp. Japan, [2-9] M. Fujimoto, Y. Kida, T. Nohma, M. Takahashi, K. Nishio and T. Saito, J. Power sources, 63, 127 (1996). [2-10] M. Fujimoto, Y. Shoji, Y. Kida, R. Ohshita, T. Nohma and K. Nishio, J. Power sources, 72, 226 (1998).
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44 Table 3-1 Properties of the graphite and coke used in this study Purity Real density Particle size Interlayer spacing Crystallite size along c-axis / % / g cm -3 / µm d 002 / nm Lc / nm Graphite >100 Coke
45 Table 3-2 Impurities contained in the graphite and coke used in this study Carbon Graphite Coke Impurities Al, Ca, Cu, Fe, Mg, Mn, Mo, P, S, Ti, Zn Ca, P, S
46 Table 3-3 Ratios of relative peak areas of carbon electrodes at 0ppm of 7 Li NMR spectra after 10 cycles and 500 cycles Carbon in Graphite in Graphite/coke hybrid carbon in Coke Ratio of relative 1.3(2) 1.1(5) 1.2(9) peak area a) a) Relative peak area of inactive lithium, P x, was calculated from the peak area at 0ppm divided by all peak areas after x cycles, and the ratio of relative peak areas was calculated from P 500 /P 10.
47 Table 3-4 Relative peak areas of carbon electrodes at 0ppm of 7 Li NMR spectra after one cycle and 1000 cycles under two voltage regions. in Graphite in Coke Condition A a) Condition B b) Condition A a) Condition B b) Q 1 after one charge 10% 26% Q 1000 after 1000 cycles 13% 16% 34% 26% Ratio of relative peak areas c) a) Condition A: charge to 4.2 V, discharge of a limited capacity of 0.10 Ah. b) Condition B: discharge to 3.0 V, charge of a limited capacity of 0.10 Ah. c) Ratio of relative peak areas was calculated from Q 1000 /Q 1.
48 Fig Charge/discharge cycle performance of type cylindrical cells using LiCoO 2 and (a) graphite, (b) graphite-coke (4/1) hybrid carbon, and (c) coke at a discharge rate of 0.20 A.
49 Fig Discharge curves of (a) graphite, (b) graphite-coke (4/1) hybrid carbon, and (c) coke at a rate of 0.25 ma cm -2 in three-electrode test cells.
50 Fig Li NMR spectra of graphite electrodes after (a) 10 and (b) 500 full range cycles (state of charge of both batteries are 100%, cell capacity was (a) 450 mah and (b) 280 mah).
51 Fig Li NMR spectra of graphite-coke (4/1) hybrid carbon electrodes after (a) 10 and (b) 500 full range cycles (state of charge of both batteries are 100%, cell capacity was (a) 390 mah and (b) 300 mah).
52 Fig Li NMR spectra of coke electrodes after (a) 10 and (b) 500 full range cycles (state of charge of both batteries are in the SOC=100%, cell capacity was (a) 330 mah and (b) 190 mah).
53 Fig Schematic image of two voltage regions.
54 Fig Li NMR spectra of graphite electrodes after 1000 cycles under (a) condition A and (b) condition B (both electrodes were charged at 0.0 V vs. Li/Li + ).
55 Fig Li NMR spectra of coke electrodes after 1000 cycles under (a) condition A and (b) condition B (both electrodes were charged at 0.0 V vs. Li/Li + ).
56 [3-1] Y. Kida, K. Yanagida, A. Funahashi, T. Nohma, and I. Yonezu, J. Power Sources, 94, 74 (2001). [3-2] R. Kanno, Y. Takeda, T. Ichikawa, K. Nakanishi, and O. Yamamoto, J. Power Sources, 26, 535 (1989). [3-3] M. Mohri, N. Yanagisawa, Y. Tajima, H. Tanaka, T. Mizuki, and H. Wada, J. Power Sources, 26, 545 (1989). [3-4] N. Imanishi, S. Ohashi, T. Ichikawa, Y. Takeda, O. Yamamoto, and R. Kanno, J. Power Sources, 39, 185 (1992). [3-5] B. Scrosati, J. Electrochem. Soc., 139, 2776 (1992). [3-6] T. Hazama, M. Miyabayashi, H. Ando, R. Ishikawa, S. Furuta, H. Ishihara, and J. Shonaka, J. Power Sources, 54, 306 (1995). [3-7] J. Conard and H. Estrade, Mater. Sci. Eng., 31, 173 (1977). [3-8] K. Tatsumi, K. Zaghib, Y. Sawada, H. Abe, and T. Ohsaki, Rechargeable Lithium and Lithium-Ion Batteries, PV94-28, (Eds. S. Megahed, B. M. Barnett, and L. Xie), The Electrochemical Society Proceedings Series, Pennington, NJ, 1994, p. 97. [3-9] T. Maeda, H. Kurokawa, M. Fujimoto T. Nohma and K. Nishio, Ext. Abst. of 36th Meet. Battery Symp. Japan, [3-10] T. Maeda, N. Nakanishi, H. Kurokawa, M. Fujimoto, T. Nohma, and K. Nishio, Ext. Abst. of 37th Meet. Battery Symp. Japan, [3-11] K. Tatsumi, T. Akai, T. Imamura, K. Zaghib, N. Iwashita, S. Higuchi, and Y. Sawada, J. Electrochem. Soc., 143, 1923 (1996). [3-12] K. Tatsumi, J. Conard, M. Nakahara, S. Menu, P. Lauginie, Y. Sawada, and Z. Ogumi, Chem. Commun., 7, 687 (1997). [3-13] N. Takami, A. Satoh, T. Ohsaki, and M. Kanda, Electrochimica Acta, 42, 2537 (1997). [3-14] N. Takami, A. Satoh, M. Oguchi, H. Sasaki, and T. Ohsaki, J. Power Sources, 68,
57 283 (1997). [3-15] Y. Nakagawa, S. Wang, Y. Matsumura, and C. Yamaguchi, Synthetic Metals, 85, 1363 (1997). [3-16] N. Imanishi, K. Kumai, H. Kokugan, Y. Takeda, and O. Yamamoto, Solid State Ionics, 107, 135 (1998). [3-17] C. Menachem, Y. Wang, J. Flowers, E. Peled, and S. G. Greenbaum, J. Power Sources, 76, 180 (1998). [3-18] K. Tatsumi, J. Conard, M. Nakahara, S. Menu, P. Lauginie, Y. Sawada, and Z. Ogumi, J. Power Sources, 81, 397 (1999). [3-19] K. Tatsumi, Tanso, 186, 54 (1999). [3-20] J. Conard and P. Lauginie, Tanso, 191, 62 (2000). [3-21] M. Fujimoto, Y. Kida, T. Nohma, M. Takahashi, K. Nishio, and T. Saito, J. Power Sources, 63, 127 (1996). [3-22] K. Kanamura, H. Tamura, and Z. Takehara, J. Electroanal. Chem., 333, 127 (1992). [3-23] M. Fujimoto, Y. Shoji, Y. Kida, R. Ohshita, T. Nohma, and K. Nishio, J. Power Sources, 72, 226 (1998). [3-24] D. Bar-Tow, E. Peled, and L. Burstein, J. Electrochem. Soc., 146, 824 (1999).
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68 Table 4-1 Properties of the graphite and coke used in this study Purity Real density Particle size Interlayer spacing Crystallite size along the c-axis (%) (g cm -3 ) (µm) d 002 (nm) Lc (nm) Graphite >100 Coke
69 Table 4-2 Combinations of graphite-coke hybrid carbons and LiNi 1-x Co x O 2 System Negative electrode material Positive electrode material A Graphite-coke (4/1) hybrid carbon LiCoO 2 B Graphite-coke (3/2) hybrid carbon LiCoO 2 C Graphite Li Ni 0.3 Co 0.7 O 2 D Graphite-coke (4/1) hybrid carbon Li Ni 0.3 Co 0.7 O 2 E Graphite Li Ni 0.7 Co 0.3 O 2 F Graphite-coke (4/1) hybrid carbon Li Ni 0.7 Co 0.3 O 2
70 Table 4-3 Discharge capacity and deterioration ratio in the charge/discharge cycle test 1) System Discharge Deterioration x in Coke capacity ratio LiNi 1-x Co x O 2 (%) (mah) (%/cycle) A B C D E F ) The test was done under constant current charge and discharge at 200 ma in a range of 2.7 to 4.1 V.
71 Fig.4-1. Discharge curves of (a) pure graphite, (b) graphite-coke (4/1) hybrid carbon, (c) graphite-coke (3/2) hybrid carbon, and (d) pure coke in a three-electrode test cell at a constant current density of 0.25 ma cm -2 [4-19].
72 Fig.4-2. Initial discharge curves of battery systems A and B in a type (2 Wh-class) cylindrical cell at a constant current of 200 ma in a range of 2.7 to 4.1 V.
73 Fig.4-3. Charge/discharge cycle performance of battery systems A and B in a type (2 Wh-class) cylindrical cell at a constant current of 200 ma in a range of 2.7 to 4.1 V.
74 Fig.4-4. Cycle performance of (a) x = 0.9, (b) x = 0.8, (c) x = 0.7, (d) x = 0.6, (e) x = 0.5, (f) x = 0.4, (g) x = 0.3, (h) x = 0.2, and (i) x = 0.1 in LiNi 1-x Co x O 2 in a three-electrode test cell at a constant current density of 0.25 ma cm -2 [4-12].
75 Fig.4-5. Initial discharge curves of battery systems C, D, E, and F in a type (2 Wh-class) cylindrical cell at a constant current of 200 ma in a range of 2.7 to 4.1 V.
76 Fig.4-6. Charge/discharge cycle performance of battery systems C, D, E, and F in a type (2 Wh-class) cylindrical cell at a constant current of 200 ma in a range of 2.7 to 4.1 V.
77 Fig.4-7. Relationship between the coke-to-graphite mixing ratio and the deterioration ratio (a) LiCoO 2, (b) LiNi 0.3 Co 0.7 O 2, and (c) LiNi 0.7 Co 0.3 O 2. Some data are from [4-19].
78 Fig.4-8. Charge/discharge cycle performance of battery system A (graphite-coke (4/1) hybrid/licoo 2 ) in a type (10 Wh-class) cylindrical cell under load-levelling imitation conditions.
79 Fig.4-9. Charge/discharge cycle performance of battery system F (graphite-coke (4/1) hybrid/lini 0.7 Co 0.3 O 2 ) in a type (10 Wh-class) cylindrical cell under load-levelling imitation conditions.
80 [4-1] T. Hazama, M. Miyabayashi, H. Ando, R. Ishikawa, S. Furuta, H. Ishihara and J. Shonaka, J. Power sources, 54, 306 (1995). [4-2] J. Aragane, K. Matsui, H. Andoh, S. Suzuki, H. Fukuda, H. Ikeda, K. Kitaba, R. Ishikawa, J. Power Sources, 68, 13 (1997). [4-3] T. Iwahori, I. Mitsuishi, S. Shiraga, N. Nakajima, H. Momose, Y. Ozaki, S. Taniguchi, H. Awata, T. Ono, K. Takeuchi, Electrochimica Acta, 45, 1509 (2000). [4-4] K. Mizushima, P. C. Jones, P. C. Wiseman, J. B. Goodenough, Mater. Res. Bull. 15, 783 (1980). [4-5] J. R. Dahn, U. von Sacken, C. A. Michel, Solid State Ionics, 44, 87 (1990). [4-6] T. Ohzuku, A. Ueda, M. Nagayama, J. Electrochem. Soc., 140, 1862 (1993). [4-7] T. Nohma, H. Kurokawa, M. Uehara, M. Takahashi, K. Nishio, T. Saito, J. Power Sources, 54, 522 (1995). [4-8] R. J. Gummow, A. de Kock, M. M. Thackeray, Solid State Ionics, 69, 59 (1994). [4-9] C. Delmas, I. Saadoune, Solid State Ionics, 53-56, 370 (1992). [4-10] C. Delmas, I. Saadoune, A. Rougier, J. Power Sources, 43-44, 595 (1993). [4-11] A. Ueda, T. Ohzuku, J. Electrochem. Soc., 141, 2010 (1994). [4-12] A. Kinoshita, K. Yanagida, A. Yanai, Y. Kida, A. Funahashi, T. Nohma, I. Yonezu, J. Power Sources, 102, 283 (2001). [4-13] J. R. Dahn, R. Fong, M. J. Spoon, Phys. Rev B, 42, 6424 (1990). [4-14] R. Kanno, Y. Takeda, T. Ichikawa, K. Nakanishi, O. Yamamoto, J. Power Sources, 26, 535 (1989). [4-15] M. Mohri, N. Yanagisawa, Y. Tajima, H. Tanaka, T. Mizuki, H. Wada, J. Power Sources, 26, 545 (1989). [4-16] J. R. Dahn, Phys. Rev B, 44, 9170 (1991). [4-17] T. Ohzuku, Y. Iwakoshi, K. Sawai, J. Electrochem. Soc., 140, 2490 (1993). [4-18] M. Fujimoto, K. Ueno, T. Nohma, M. Takahashi, K. Nishio and T. Saito, Proceedings of the symposium on new sealed rechargeable batteries and
81 supercapacitors, [4-19] Y. Kida, K. Yanagida, A. Funahashi, T. Nohma, I. Yonezu, J. Power Sources, 94, 74 (2001). [4-20] Y. Kida, K. Yanagida, A. Funahashi, T. Nohma, I. Yonezu, Electrochemistry, 70, 26 (2002).
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91 Table 5-1 Properties of the graphite and coke used in this study Purity Real density Particle size Interlayer spacing Crystallite size along the c-axis / % / g cm -3 / µm d 002 / nm Lc / nm Graphite >100 Coke
92 Fig.5-1. Initial discharge curve of type (10 Wh-class) cell using LiNi 0.7 Co 0.3 O 2 and graphite/coke hybrid carbon (4/1 in weight ratio) at a discharge current of 370 ma.
93 Fig % SOC cycle performance of type (10 Wh-class) cell using LiNi 0.7 Co 0.3 O 2 and graphite/coke hybrid carbon (4/1 in weight ratio) at a charge and discharge current of 1190 ma.
94 Fig.5-3. Discharge curves of graphite/coke hybrid carbon (4/1 in weight ratio) (a) after one charging and (b) after 2000 cycles in three-electrode test cells at a current density of 0.25 ma cm -2.
95 Fig.5-4. SEM images of graphite/coke hybrid carbon after 2000 cycles.
96 Fig Li NMR spectra of graphite/coke hybrid carbon (a) after one charging and (b) after 2000 cycles.
97 Fig.5-6. XPS of graphite/coke hybrid carbon (a) O 1S after one charging, (b) O 1S after 2000 cycles, (c) F 1S after one charging, and (d) F 1S after 2000 cycles.
98 Fig.5-7. Nyquist plots of graphite/coke hybrid carbon (a) after one charging and (b) after 2000 cycles.
99 Fig.5-8. Discharge curves of type (10 Wh-class) cell (a) after one charging, (b) after 2000 cycles, and (c) after 2050 cycles (CC-CV charging) at a discharge current of 370 ma.
100 Fig % SOC cycle performance of type (10 Wh-class) cell using LiNi 0.7 Co 0.3 O 2 and graphite/coke hybrid carbon (4/1 in weight ratio).
101 [5-1] T. Hazama, M. Miyabayashi, H. Ando, R. Ishikawa, S. Furuta, H. Ishihara and J. Shonaka, J. Power sources, 54, 306 (1995). [5-2] J. R. Dahn, R. Fong, M. J. Spoon, Phys. Rev B, 42, 6424 (1990). [5-3] R. Kanno, Y. Takeda, T. Ichikawa, K. Nakanishi, O. Yamamoto, J. Power Sources, 26, 535 (1989). [5-4] M. Mohri, N. Yanagisawa, Y. Tajima, H. Tanaka, T. Mizuki, H. Wada, J. Power Sources, 26, 545 (1989). [5-5] J. R. Dahn, Phys. Rev B, 44, 9170 (1991). [5-6] T. Ohzuku, Y. Iwakoshi, K. Sawai, J. Electrochem. Soc., 140, 2490 (1993). [5-7] M. Fujimoto, K. Ueno, T. Nohma, M. Takahashi, K. Nishio and T. Saito, Proceedings of the symposium on new sealed rechargeable batteries and supercapacitors, [5-8] Y. Kida, K. Yanagida, A. Funahashi, T. Nohma, I. Yonezu, J. Power Sources, 94, 74 (2001). [5-9] Y. Kida, K. Yanagida, A. Funahashi, T. Nohma, I. Yonezu, Electrochemistry, 70, 590 (2002). [5-10] H. Kurokawa, T. Nohma, M. Fujimoto, T. Maeda, K. Nishio and T. Saito, Ext. Abst. of the International Workshop on Advanced Batteries, Japan, [5-11] H. Kurokawa, T. Maeda, N. Nakanishi, T. Nohma, K. Nishio, Ext. Abst. of the 8th International Meeting of Lithium Batteries, [5-12] K. Mizushima, P. C. Jones, P. C. Wiseman, J. B. Goodenough, Mater. Res. Bull., 15, 783 (1980). [5-13] J. R. Dahn, U. von Sacken, C. A. Michel, Solid State Ionics, 44, 87 (1990). [5-14] T. Ohzuku, A. Ueda, M. Nakajima, J. Electrochem. Soc., 140, 1862 (1993). [5-15] T. Nohma, H. Kurokawa, M. Uehara, M. Takahashi, K. Nishio, T. Saito, J. Power Sources, 54, 522 (1995). [5-16] R. J. Gummow, A. de Kock, M. M. Thackeray, Solid State Ionics, 69, 59 (1994).
102 [5-17] C. Delmas, I. Saadoune, A. Rougier, J. Power Sources, 43-44, 595 (1993). [5-18] A. Ueda, T. Ohzuku, J. Electrochem. Soc., 141, 2010 (1994). [5-19] A. Kinoshita, K. Yanagida, A. Yanai, Y. Kida, A. Funahashi, T. Nohma, I. Yonezu, J. Power Sources, 102, 283 (2001). [5-20] E. Peled, J. Electrochem. Soc., 126, 2047 (1979). [5-21] M. Fujimoto, Y. Shoji, Y. Kida, R. Ohshita, T. Nohma, K. Nishio, J. Power Sources, 72, 226 (1998). [5-22] D. Aurbach, B. Markovsky, A. Shechter, Y. Ein-Eli, H. Cohen, J. Electrochem. Soc., 143, 3809 (1996). [5-23] D. Bar-Tow, E. Peled, L. Burstein, J. Electrochem. Soc., 146, 824 (1999). [5-24] K. Kanamura, H. Tamura, Z. Takehara, J. Electroanal. Chem., 333, 127 (1992). [5-25] N. Takami, A. Satoh, T. Ohsaki, M. Kanda, Electrochimica Acta, 42, 2537 (1997). [5-26] J. Conard, H. Estrade, Mater. Sci. Eng., 31, 173 (1977). [5-27] K. Tatsumi, K. Zaghib, Y. Sawada, H. Abe, and T. Ohsaki, Rechargeable Lithium and Lithium-Ion Batteries, PV94-28, (Eds. S. Megahed, B. M. Barnett, and L. Xie), The Electrochemical Society Proceedings Series, Pennington, NJ, 1994, p. 97. [5-28] K. Tatsumi, T. Akai, T. Imamura, K. Zaghib, N. Iwashita, S. Higuchi, Y. Sawada, J. Electrochem. Soc., 143, 1923 (1996). [5-29] N. Imanishi, K. Kumai, H. Kokugan, Y. Takeda, O. Yamamoto, Solid State Ionics, 107, 135 (1998). [5-30] Y. Dai, Y. Wang, V. Eskenazi, E. Peled, S. G. Greenbaum, J. Electrochem. Soc., 145, 1179 (1998). [5-31] E. Peled, D. B. Tow, A. Merson, L. Burstein, J. New Mat. Electrochem. Systems, 3, 319 (2000).
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112 Table 6-1 Properties of the graphite and coke used in this study Purity Real density Particle size Interlayer spacing Crystallite size along the c-axis (%) (g cm -3 ) (µm) d 002 (nm) Lc (nm) Graphite >100 Coke
113 Table 6-2 Lattice parameters in Li x Ni 0.7 Co 0.3 O 2 a axis (nm) c axis (nm) At initial After 2000 cycles After 2350 cycles
114 Table 6-3 Atomic ratio by ICP spectroscopy and AAS Li Ni Co At initial After 2000 cycles After 2350 cycles * The results calculated as total contents of nickel and cobalt are 1.00.
115 Fig % SOC cycle performance of type (10 Wh-class) cell using LiNi 0.7 Co 0.3 O 2 and graphite/coke hybrid carbon (4/1 in weight ratio) at a charge and discharge current of 1190 ma.
116 Fig.6-2. Discharge curves of type (10 Wh-class) cell (a) at initial, (b) after 2000 cycles, (c) after 2050 cycles and (d) after 2350 cycles using LiNi 0.7 Co 0.3 O 2 and graphite/coke hybrid carbon (4/1 in weight ratio) at a discharge current of 370 ma.
117 Fig.6-3. SEM images of positive electrode at initial state.
118 Fig.6-4. SEM images of positive electrode after 2350 cycles.
119 Fig.6-5. Nyquist plots of LiNi 0.7 Co 0.3 O 2 positive electrode (a) after one charging and (b) after 2350 cycles.
120 Fig.6-6. Nyquist plots of graphite/coke hybrid carbon negative electrode (a) after one charging and (b) after 2350 cycles.
121 Fig.6-7. XRD pattern of positive electrode after 2350 cycles.
122 Fig.6-8. Discharge curves of LiNi 0.7 Co 0.3 O 2 positive electrode (a) at first discharge, (b) after 2000 cycles, and (c) after 2350 cycles in three-electrode test cells at a current density of 0.25 ma cm -2.
123 Fig.6-9. Discharge curves of graphite/coke hybrid carbon negative electrode (a) at first discharge, (b) after 2000 cycles, and (c) after 2350 cycles in three-electrode test cells at a current density of 0.25 ma cm -2.
124 Fig Relationships x in Li x Ni 0.7 Co 0.3 O 2 and charge/discharge curves (a) charge at initial state, (b) discharge at initial state, (c) first charge after cell decomposition and (d) third discharge after cell decomposition (the cell was decomposed after 2350 charge/discharge cycles).
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134 Yoshinori Kida, Katsunori Yanagida, Atsuhiro Funahashi, Toshiyuki Nohma, Ikuo Yonezu Electrochemical characteristics of graphite, coke and graphite/coke hybrid carbon as negative electrode materials for lithium secondary batteries, Journal of Power Sources, 94, (2001). Yoshinori Kida, Katsunori Yanagida, Atsuhiro Funahashi, Toshiyuki Nohma, Ikuo Yonezu 7 Li NMR study on carbon negative electrodes in lithium secondary batteries, Electrochemistry, 70(8), (2002). Yoshinori Kida, Akira Kinoshita, Katsunori Yanagida, Atsuhiro Funahashi, Toshiyuki Nohma, Ikuo Yonezu A study on the cycle performance of lithium secondary batteries using lithium nickel-cobalt composite oxide and graphite/coke hybrid carbon, Electrochimica Acta, 47, (2002). Yoshinori Kida, Akira Kinoshita, Katsunori Yanagida, Atsuhiro Funahashi, Toshiyuki Nohma, Ikuo Yonezu Study on capacity fade factors of lithium secondary batteries using LiNi 0.7 Co 0.3 O 2 and graphite-coke hybrid carbon, Electrochimica Acta, 47, (2002). Yoshinori Kida, Katsunori Yanagida, Atsushi Yanai, Atsuhiro Funahashi, Toshiyuki Nohma, Ikuo Yonezu
135 Cycle performance of LiCo x Ni 1-x O 2 /graphite-coke hybrid carbon systems for long-life lithium secondary batteries, Journal of Power Sources, 142, (2005). Masahisa Fujimoto, Yoshinori Kida, Toshiyuki Nohma, Masatoshi Takahashi, Koji Nishio, Toshihiko Saito Electrochemical behavior of carbon electrodes in some electrolyte solutions, Journal of Power Sources, 63, (1996). Masahisa Fujimoto, Yoshihiro Shoji, Yoshinori Kida, Toshiyuki Nohma, Masatoshi Takahashi, Koji Nishio Influence of solvent species on the charge-discharge characteristics of a natural graphite electrode, Journal of Power Sources, 72, (1998). Akira Kinoshita, Katsunori Yanagida, Atsushi Yanai, Yoshinori Kida, Atsuhiro Funahashi, Toshiyuki Nohma, Ikuo Yonezu Electrochemical characteristics of LiNi 1-x Co x O 2 as positive electrode materials for lithium secondary batteries, Journal of Power Sources, 102, (2001). Atsuhiro Funahashi, Yoshinori Kida, Katsunori Yanagida, Toshiyuki Nohma, Ikuo Yonezu Thermal Simulation of a large-scale lithium secondary batteries using graphite-coke hybrid carbon negative electrode and LiNi 0.7 Co 0.3 O 2 positive electrode, Journal of Power Sources, 104, (2002).
136 Katsunori Yanagida, Atsushi Yanai, Yoshinori Kida, Atsuhiro Funahashi, Toshiyuki Nohma, Ikuo Yonezu Charge-discharge characteristics of graphite-hard carbon hybrid carbon and graphite-coke hybrid carbon as negative electrode materials for lithium secondary batteries, Journal of Electrochemical Society, 149(7), A804-A807 (2002). K. Yanagida, A. Yanai, Y. Kida, A. Funahashi, T. Nohma and I. Yonezu Charge-discharge cycle performance of lithium secondary batteries using hybrid carbon as negative electrode materials, 10th International Meeting on Lithium Batteries, Abst No.337, Como, (2000). I. Yonezu, K. Yanagida, Y. Kida, A. Funahashi and T. Nohma Development of 250 Wh-class Long Lithium Secondary Batteries and 2 kwh-class module using a Graphite-coke Hybrid Carbon Negative Electrode for Home-use Load-leveling Systems, Electric Energy Applications and Technologies (EESAT) 2000, (2000). K. Yanagida, Y. Kida, A. Funahashi, T. Nohma, and I. Yonezu Development of Long Life Lithium Secondary Batteries Using Hybrid Carbon Negative Electrode for Home-Use Load-Leveling Systems, 4th Hawaii battery Conference (HBC2002), (2002). N. Nakanishi, K. Yanagida, Y. Kida, A. Funahashi, T. Nohma, and I. Yonezu Capacity-fade mechanisms during charge-discharge cycles of long life lithium secondary batteries, 11th International Meeting on Lithium Batteries, Abst No.
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