介电谱
电解质
电池(电)
材料科学
电化学
分析化学(期刊)
电极
欧姆接触
电阻抗
离子
内阻
复合材料
电气工程
化学
热力学
色谱法
功率(物理)
图层(电子)
有机化学
物理化学
工程类
物理
作者
Xijin Wu,Zhenyu He,Tianqi Wang,Xin Li,Dongmei Yang,Qingshan Wang,Yan Li
出处
期刊:IOP conference series
[IOP Publishing]
日期:2021-02-01
卷期号:675 (1): 012220-012220
被引量:5
标识
DOI:10.1088/1755-1315/675/1/012220
摘要
Abstract Change in temperature affects cycle life and performance of the LiFePO 4 battery. Thus, different temperature (-20°C∼45°C) performance of the LiFePO 4 battery was investigated by electrochemical impedance spectroscopy (EIS). The prismatic 40 Ah batteries testing was utilized to show the effect of increasing temperature on ohmic impedance (RΩ) and charge transfer internal resistance (R ct ), and evaluate electrical performance consistency of a batch of batteries The results showed that the effect of increasing temperature on RΩ was very slight and on R ct was more obvious. The change was believed to result from ion moving speed, chemical reaction speed and ion charge transfer process at the electrode/electrolyte interface. At low-temperature (-20°C), the standard deviation of R was larger than other higher temperature, indicating that the electrical performance difference of the battery pack was large under low temperature condition.
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