Establishment of Nondestructive Degradation Evaluation and Lifetime Estimation Method of Lithium-ion Secondary Battery Considering Degradation Modes

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420264
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Power engineering/Power conversion/Electric machinery
• Research Institution: The University of Shiga Prefecture
• Principal Investigator: INUI Yoshitaka 滋賀県立大学, 工学部, 教授 (70168425)
• Co-Investigator(Kenkyū-buntansha): IKENOUE Takumi 京都大学, 大学院エネルギー科学研究科, 助教 (00633538) ; TANAKA Tadashi 茨城大学, 工学部, 講師 (40583985)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: リチウムイオン二次電池 / 劣化評価 / 寿命推定 / 交流インピーダンス特性 / 起電力

Outline of Final Research Achievements

Detailed information on degradation process of lithium-ion secondary batteries is essential to manage the batteries throughout their lifetime. Therefore, the authors at first proposed a new evaluation method of detailed degradation process of lithium-ion secondary batteries through measurements of AC impedance and electromotive force of degraded batteries. Since this proposed evaluation method separately evaluates each degradation mode of the batteries, it can provide simple but detailed diagnosis of battery degradation degree. Next, the authors made clear detailed temperature dependence of each degradation mode. These obtained results make it possible to develop a simple but accurate performance evaluation and lifetime estimation method of degraded lithium-ion secondary batteries.

Free Research Field

エネルギー変換工学，電力工学