Interfacial properties between LiFePO4 and poly(ethylene oxide)–Li(CF3SO2)2N polymer electrolyte
Interfacial properties between LiFePO4 and poly(ethylene oxide)–Li(CF3SO2)2N polymer electrolyte
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DOI：
10.1016/j.jpowsour.2009.08.087
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发表时间：
2009-07
影响因子：
9.2
通讯作者：
K. Hanai;K. Kusagawa;M. Ueno;T. Kobayashi;N. Imanishi;A. Hirano;Y. Takeda;O. Yamamoto
中科院分区：
文献类型：
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作者：
K. Hanai;K. Kusagawa;M. Ueno;T. Kobayashi;N. Imanishi;A. Hirano;Y. Takeda;O. Yamamoto
通过测量LixFePO4/PEO-LiTFSI/LixFePO4电池在30-60℃温度范围内的交流阻抗，测试了LixFePO4与聚氧化乙烯(PEO)-Li(CF3SO2)2N(LiTFSI)电池之间的界面电阻。根据等效电路对电池阻抗的分析，提出了R0、R1、R2和R3四种类型的电阻。在高频范围内，R0和R1之和与PEO电解液的电阻一致。中频区的R2与锂离子向复合电极内部电荷转移的活化点有关，而低频区的R3被认为是电荷转移阻力。R2的活化能受电极厚度和成分的影响，而R3的活化能不受电极厚度和成分的影响。
The interface resistance between LixFePO4and poly(ethylene oxide) (PEO)–Li(CF3SO2)2N (LiTFSI) was examined by AC impedance measurement of a LixFePO4/PEO–LiTFSI/LixFePO4cell in the temperature range of 30–60°C. Four types of resistance, R0, R1, R2 and R3 were proposed according to analysis of the cell impedance using an equivalent circuit. The sum of R0 and R1 in the high frequency range is consistent with the resistance of the PEO electrolyte. R2 in the middle frequency range is related to lithium ion transport to an active point for charge transfer inside the composite electrode, and R3 in the low frequency range is considered to be the charge transfer resistance. The activation energy for R2 was affected by the thickness and composition of the electrode, whereas that for R3 was not.