Premium
Judging Degradation of Lithium‐Ion Batteries Using a Real‐Time Capacitance Measurement
Author(s) -
KANEKO FUTAO,
KAWAKAMI TAKAHIRO,
SHINBO KAZUNARI,
BABA AKIRA,
KATO KEIZO,
MIYAZAKI SHIGETOSHI,
SHIMIZU KOICHI,
SATO KENICHI,
HANAOKA OSAMU
Publication year - 2017
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.22962
Subject(s) - capacitance , degradation (telecommunications) , materials science , voltage , differential capacitance , ion , lithium (medication) , electrode , analytical chemistry (journal) , current (fluid) , optoelectronics , electrical engineering , chemistry , engineering , chromatography , organic chemistry , medicine , endocrinology
SUMMARY A novel method was proposed to judge degradation/health of lithium‐ion batteries (LIBs) using the capacitance that was estimated from the real‐time voltage and current characteristics of the batteries. It is thought that the capacitance of LIBs decreases with degradation because of undesirable components formed on the electrodes that are the main cause of the degradation. As the LIBs are active, the capacitance was evaluated from the differential equation, ∆ Q /∆ v = I /(∆ v /∆ t ) = i /( dv / dt ), using the voltage and current characteristics during the charging or discharging. The capacitances of the commercial LIBs with different SOHs; 100%, 92%, and 88% were estimated during the charging and discharging using the equation. The average capacitance in the specific voltage region of the batteries was directly proportional to the state of health. Therefore, the proposed measurement is thought to be a useful method for judging degradation of LIBs.