无机材料学报

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新型碳热还原法制备LiFePO4/C复合材料及其性能研究

刘素琴, 龚本利, 黄可龙, 张戈, 李世彩   

  1. 中南大学化学化工学院, 长沙 410083
  • 收稿日期:2006-04-28 修回日期:2006-10-10 出版日期:2007-03-20 网络出版日期:2007-03-20

Synthesis of LiFePO4/C Composite Cathode Materials by a Novel Carbothermal Reduction Method and Its Performance

LIU Su-Qin, GONG Ben-Li, , ZHANG Ge, LI Shi-Cai   

  1. College of Chemical & Chemical Engineering, Central South University, Changsha 410083, China
  • Received:2006-04-28 Revised:2006-10-10 Published:2007-03-20 Online:2007-03-20

摘要: 以葡萄糖为碳源, 采用一种新的碳热还原法制备LiFePO4/C正极材料. 采用TG-DTA、XRD、TEM等手段对前驱体及产物进行了表征, 研究了碳热还原的反应历程, 测试了样品的电化学性能. 结果表明, 该碳热还原法可以降低煅烧温度. 600℃烧结24h的样品在0.05C下首次放电容量达156mAh·g-1, 在0.1、0.2、0.5、1C下首次放电容量分别为146、135、130、121mAh·g-1. 该样品在1C下经过30次循环, 容量还保持为119mAh·g-1, 衰减仅为1.65%.

关键词: 锂离子电池, 正极材料, LiFePO4, 碳热还原法

Abstract: LiFePO4/C composite cathode materials were synthesized by a novel carbothermal reduction(CTR) method using glucose as carbon resource. The precursors and the products were characterized by TG-DTA, XRD, TEM, and the reaction mechanism was investigated. The electrochemical performance of the samples was measured. The results show that the new method can reduce synthesis temperature, and the sample prepared at 600℃ for 24h can deliver a discharge capacity of 156mAh·g-1 at 0.05C. The first discharge capacities of LiFePO4 at 0.1C, 0.2C, 1C are 146mAh·g-1, 135mAh·g-1, 130mAh·g-1, 121mAh·g-1, respectively. It retains discharge capacity of 119mAh·g-1 at 1C after 30 cycles, with only 1.56% capacity decrease.

Key words: lithium-ion battery, cathode materials, LiFePO4, carbothermal reduction method

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