电源技术2011，Vol.35Issue(3)：248-251,4.
Mg2+不同取代位对LiFePO4/C性能的影响
Effect of different substitute position of Mg2+on performance of LiFePO4/C
摘要
Abstract
Li0.96Mg0.02FePO4/C,LiFe0.98Mg0.02PO4/C and uncertain substitute LiFePO4/C+Mg2+ cathode materials were synthesized by high-temperature solid-state reaction with sucrose as carbon source. The structure, morphology and electrochemical performance of the samples were tested by XRD, SEM, galvanostatic charge-discharge test, cyclic voltarnmogram and AC impedance methods. The results show that all samples are pure phases with an ordered olivine structure. The biggest specific discharge capacity of Li0.98Mg0.02,FePO4/C and LiFe0.98Mg0.02PO4/C are 138.2 mAh/g and 142.6 mAh/g at 0.2C( 1C =150 mAh/g ), respectively. The biggest specific discharge capacity of Li0.96Mg0.02FePO4/C is 102.1 mAh/g, which is the smallest in three samples. Furthermore, the capacity fading of Li0.98Mg0.02FePO4/C is 3％, and there is almost no capacity fading of LiFe0.98Mg0.02PO4/C after 20 cycles. In comparison,the capacity loss of LiFePO4/C+Mg2+is biggest after 20 cycles.关键词
锂离子电池/正极材料/LiFePO4/Mg2+掺杂/高温固相法Key words
lithium-ion battery/ cathode materials/ LiFePO4/ Mg2+doping/ high-temperature solid-state reaction分类
信息技术与安全科学引用本文复制引用
夏继平,王连亮,邓小川,高成华..Mg2+不同取代位对LiFePO4/C性能的影响[J].电源技术,2011,35(3):248-251,4.基金项目
青海省重点科技攻关项目(2006-G-168) （2006-G-168）
