Effects of Solvents on the Electrochemical Performance of LiFePO4/C Composite Electrodes
作者： Guixin Wang , Hanchang Kang , Miao Chen , Kangping Yan , Xueshan Hu
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摘要: Author(s): Wang, G; Kang, H; Chen, M; Yan, K; Hu, X; Cairns, EJ | Abstract: The electrolyte, a key component for the successful operation of energy materials, is greatly affected by its solvents. influence solvents on electrochemical performance LiFePO /C composite cathode was investigated at various operating temperatures. reaction kinetics electrode, including changes rate capability, redox potential, polarization degree, electrode process, exchange current densities, and activation energies, were evaluated using techniques. composition volume ratio affect kinetics. In mixed ethylene carbonate (EC), dimethyl (DMC) ethyl methyl (EMC), EMC beneficial room temperature performance, while substitution 20 vol % acetate (EA) good low performance. When 30 DMC substituted 10 EA, density increases from 0.022 to 0.038 mA cm −20 °C, charge-transfer process decreases 48.36 33.01 kJ mol . Possible mechanisms improving different have been analyzed. These results are significant exploration appropriate electrolytes extensive applications electrodes. 4 −2 −1
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