以FePO_4·2H_2O、Li_2CO_3和柠檬酸/酒石酸/抗坏血酸为原料,经机械球磨后在惰性气氛中高温煅烧合成LiFePO_4/C正极材料.研究了不同碳源对LiFePO_4结构、形貌及电化学性能的影响.重点考察了碳源为酒石酸时,不同合成温度对材料性能的影响.采用XRD、SEM以及电化学测试等手段对目标产物进行了结构表征和性能测试.结果表明,以酒石酸做碳源时,合成的正极材料物相单一,颗粒细小,粒度均匀,并且具有优良的电化学性能.在室温下以0.1C倍率充放电,首次放电比容量可达155mAh/g,1.0C首次放电比容量为120mAh/g,经过100次循环以后容量仍有109mAh/g.
LiFePO_4/C cathode material was synthesized by ball-milling and then sintering at high temperature under the protection of the inert gas with precursor FePO_4·2H_2O, Li_2CO_3 and monohydrate acid /tartaric acid/ ascorbic acid as raw materials. The effects of different carbon source on the structure, morphology and electrochemical performance of as-synthesized cathode materials were investigated, especially, the effects of different temperatures with tartaric acid as carbon source. The crystal structure and the electrochemical performance were characterized by XRD, SEM, and electrochemical performance testing. The results show that the as-synthesized cathode materials with tartaric acid as carbon source are pure and have excellent electrochemical performance. The particles are small and the distribution of particle size is uniform. At room temperature, the specific discharge capacity reaches 155mAh/g at 0.1C, 91.18% of the theoretical capacity. The specific discharge capacity at 1.0C reaches 120mAh/g and remains 109mAh/g after 100 cycles.
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