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Enhanced low-temperature performance of slight Mn-substituted liFePO_4/C cathode for lithium ion batteries

Chinese Science Bulletin 2011年第12期56卷 1262-1266页

作者： zeng lingjie gong qiang liao xiaozhen he li he yushi ma zifeng Department of Chemical Engineering Institute of Electrochemical & Energy Technology Shanghai Jiao Tong University Shanghai 200240China

Low temperature performance of liFePO4/C cathode was remarkably improved by slight Mn-substitution. Electrochemical measurements showed that about 95% of the discharge capacity of liFe0.98Mn0.02PO4/C cathode at 20°C was obtained at 0°C, compared to 85% of that of liFePO4/C cathode. The liFe0.98Mn0.02PO4/C sample also presented enhanced rate performance at –20°C with the discharge capacities of 124.4 ma h/g (0.1C), 99.8 ma h/g (1C), 80.7mah/g (2C) and 70 ma h/g (5C), respectively, while pristine liFePO4/C only delivered capacities of 120.5 ma h/g (0.1C), 90.7 ma h/g (1C), 70.4 ma h/g (2C) and 52.2 ma h/g (5C). Cyclic voltammetry measurements demonstrated an obvious improvement of the lithium insertion-extraction process of the liFePO4/C cathode by slight Mn-substitution. The results of FSEM observation and electrical conductivity measurement indicated that slight Mn-substitution minimized the particle size of liFe0.98Mn0.02PO4/C and also obviously improved the electrical conductivity of the compound, thus obviously enhances the interface reaction process on the cathode.

关键词：磷酸铁锂低温性能电池正极锰取代锂离子 liFePO4 放电容量电化学测量

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