solvothermal technique

摘要：

Spherical LiFePO4/C composite was prepared via a low-temperature solvothermal reaction followed by high-temperature treatment. The as-prepared sample was characterized by XRD, SEM, FTIR, cyclic voltammetry(CV) and galvanostatic charge-discharge tests. It was confirmed that the spherical LiFePO4/C were composed of crystalline LiFePO4 with a size of c.a.10 μm. As-prepared micrometer-sized spherical LiFePO4 particles were successful in overcoming the major limitation of volumetric energy density and reached a high tap density of 1.4g.cm-3. The charge-discharge tests showed that the as-fabricated spherical LiFePO4/C cathode in lithium-ion cells demonstrated high reversible capacity (154 mAh g.1 at 0.1C, 135.2 mAh g.1 at 0.2C,115 mAh g1 at 1C) and good cycle stability (columbic efficiency 100％ after 50 cycles). Compared with the nano-LiFePO4 positive electrode material, this spherical and nanoporous materials resulted in a similarly high rate capability plus a higher volumetric energy density. So, as-prepared LiFePO4/C powder with high tap density makes an attractive positive electrode candidate for lithium-ion batteries designed for high energy density.

关键词： Cathode material LiFePO4 High energy density Solvothermal.

作者: Lian-xing LI Xin-cun TANG Yi QU Hong-tao Liu Zhou-guang LU

作者单位: College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China Stat

会议类型: 国内会议

会议名称: 2010中国材料研讨会

会议地点: 长沙

会议语种:英文

页码: 1-8

在线出版日期: 2010-06-19（万方平台首次上网日期，不代表论文的发表时间）