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A Novel Method for Judging Health/Degradation of Lithium-Ion Batteries

Published online by Cambridge University Press:  07 July 2014

Futao Kaneko
Affiliation:
Niigata University, 2-8050 Ikarashi, Nishi-ku, Niigata, 950-2181 Japan
Takahiro Kawakami
Affiliation:
Niigata University, 2-8050 Ikarashi, Nishi-ku, Niigata, 950-2181 Japan
Akira Baba
Affiliation:
Niigata University, 2-8050 Ikarashi, Nishi-ku, Niigata, 950-2181 Japan
Kazunari Shinbo
Affiliation:
Niigata University, 2-8050 Ikarashi, Nishi-ku, Niigata, 950-2181 Japan
Keizo Kato
Affiliation:
Niigata University, 2-8050 Ikarashi, Nishi-ku, Niigata, 950-2181 Japan
Shigetoshi Miyazaki
Affiliation:
Alps Electric Instruments, 285 Takebusa, Shinsyushinmachi, Nagano, 381-2411 Japan
Koichi Shimizu
Affiliation:
Alps Electric Instruments, 285 Takebusa, Shinsyushinmachi, Nagano, 381-2411 Japan
Kenichi Sato
Affiliation:
Midori Anzen, 5-27-1 Inari, Souka, 340-0003 Japan
Osamu Hanaoka
Affiliation:
Midori Electronic, 397 Togura, Chikuma, 389-0804 Japan
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Abstract

A novel and fundamental method was reported to judge states of lithium ion batteries (LIBs) using the capacitance and the voltage of the cells that were estimated from the real-time currents and voltage characteristics of the cells. We measured the differential capacitance, that is, dQ/dV or delta Q/ delta V that is equal to the currents (I) divided by differential voltages (dV/dt) calculated from the current and the voltage characteristics of the cell during the charging/ discharging, where Q is the charge that flows through the cell, V is the voltage of the cell and t is time. It is thought that the capacitance decrease with the degradation of the cell because the effective area of the electrodes is decreasing due to formation of undesirable compounds. The differential capacitance in some specific voltage range for the LIBs was approximately directly proportional to the state of the degradation of the cell. Therefore, it is concluded that the novel method is very useful to judge the state of the LIBs.

Type
Articles
Copyright
Copyright © Materials Research Society 2014 

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References

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