Study on the stability of the LiFePO4 Li-ion battery via an electrochemical method
Study on the stability of the LiFePO4 Li-ion battery via an electrochemical method
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电化学方法研究LiFePO4锂离子电池的稳定性
DOI：
10.1016/j.jpowsour.2013.11.019
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发表时间：
2014-03
影响因子：
9.2
通讯作者：
Tong, Ye-Xiang
中科院分区：
文献类型：
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作者：
Xia, Xin-De;Xue, Jian-Jun;Liu, Peng;Tong, Ye-Xiang
磷酸铁锂电池是一种很有前途的电动汽车电源。然而，由于LIPB的稳定性差，它们通常表现出较低的性能均匀性。本文采用电化学方法对LIPB的稳定性进行了研究，结果表明，由于LIPB表面形成了稳定的固体电解质界面（SEI）膜，因此采用充放电循环和老化两种活化方法可以获得稳定的LIPB。稳定的SEI膜与LIPB的低自放电相关，其特征在于在放电状态下的存储期间保持高开路电压（OCV）、高容量、稳定的内阻和高充电/放电可逆性。大多数低OCV的LIPB可以通过包括充放电循环和老化的电化学处理来修复。充放电循环和老化的活化过程诱导了光滑、粘附和稳定的SEI膜的产生，有助于电池的良好稳定性。稳定的SEI膜的实现主要是由于在充放电循环期间形成完全覆盖电极表面的表面层，以及通过在老化期间将层的物质转化为“更无机”的化合物如羧酸盐或甚至碳酸盐（如Li 2CO 3）来稳定层。
Lithium iron phosphate battery (LIPB) is a promising power source for electric vehicle. However, LIPBs generally show a low uniformity in performances due to their poor stability. Herein, we employ an electrochemical method to study the stability of LIPB, and the results show that stable LIPB can be obtained by using the activation with both charge–discharge cycle and aging, since the stable solid-electrolyte-interface (SEI) films are available. The stable SEI films are associated with the low self-discharge of LIPB, characterized by keeping high open circuit voltage (OCV) during storage under discharged states, high capacity, stable internal resistance, and high charge/discharge reversibility. Most of the low-OCV LIPBs can be repaired by using the electrochemical treatment containing charge–discharge cycle and aging. The activation processes with charge–discharge cycle and aging induce the generation of the smooth, adherent, and stable SEI films, contributing to the good stability of the battery. The achievement of the stable SEI films is mainly resulted from the formation of the surface layers completely covering the electrodes' surfaces during charge–discharge cycle, and the stabilization of the layers by transforming the layers' species to the “more inorganic” compounds such as carboxylates or even carbonates (like Li2CO3) during aging.
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影响因子：
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作者：
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通讯作者：
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影响因子：
3.7
作者：
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通讯作者：
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作者：
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通讯作者：
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影响因子：
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通讯作者：
Maier, Joachim