石墨烯
材料科学
复合数
锂(药物)
氧化物
纳米颗粒
涂层
化学工程
复合材料
阴极
离子
纳米技术
化学
有机化学
物理化学
内分泌学
冶金
工程类
医学
作者
Wen Luo,Shulei Chou,Yuchun Zhai,Huan Liu
出处
期刊:Journal of materials chemistry. A, Materials for energy and sustainability
[The Royal Society of Chemistry]
日期:2014-01-01
卷期号:2 (14): 4927-4927
被引量:73
摘要
A graphene encapsulated LiFePO4 composite has been synthesized by self-assembly of surface modified LiFePO4 and graphene oxide with peptide bonds, followed by reduction. The graphene forms a continuous conductive coating network connecting the LiFePO4 nanoparticles to facilitate electron transportation, resulting in excellent high rate capability with 70% capacity retention at 50 C rate. The apparent activation energy of the graphene encapsulated LiFePO4 composite (9.6 kJ mol−1) is much lower than that of the carbon coated LiFePO4 (14.6 kJ mol−1). An excellent cycling performance is also demonstrated, in which the capacity loss is less than 8.6% after 950 cycles at 10 C. Therefore, this hybrid material is promising for use as a cathode material for high rate lithium ion batteries.
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