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The interface resistance between Li x FePO 4 and poly(ethylene oxide) (PEO)–Li(CF 3 SO 2 ) 2 N (LiTFSI) was examined by AC impedance measurement of a Li x FePO 4 /PEO–LiTFSI/Li x FePO 4 cell 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...
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