Facile Preparation of Monolithic LiFePO4/Carbon Composites with Well-Defined Macropores for a Lithium-Ion Battery
Facile Preparation of Monolithic LiFePO4/Carbon Composites with Well-Defined Macropores for a Lithium-Ion Battery
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DOI：
10.1021/cm2021438
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发表时间：
2011-12-13
影响因子：
8.6
通讯作者：
Abe, Takeshi
中科院分区：
文献类型：
--
作者：
Hasegawa, George;Ishihara, Yuya;Abe, Takeshi
本文提出了一种制备LiFePO 4/C复合材料的新方法。采用溶胶-凝胶相分离法制备了由无机网络和有机聚合物组成的前驱体大孔凝胶。无机-有机杂化凝胶在惰性气氛下煅烧，得到LiFePO 4/碳整料。研究了起始组分对凝胶形态的影响，并对凝胶网络的组成进行了讨论。采用热分析、X射线衍射和拉曼散射等方法研究了煅烧过程中绿色体中磷酸铁锂晶化的反应机理。此外，通过充放电测试考察了所得LiFePO 4/C复合材料的电化学性能。
A novel and facile method for the preparation of monolithic LiFePO4/carbon composites with well-defined macropores has been developed. The precursor macroporous gels consisting of inorganic networks as well as organic polymers were fabricated by the epoxide-mediated sol-gel method accompanied by phase separation. The inorganic-organic hybrid gels were calcined under an inert atmosphere, resulting in LiFePO4/carbon monoliths. The influence of the starting compositions on the gel morphologies has been investigated, and the constituents of the gel network were discussed. The reaction mechanism of the crystallization of LiFePO4 from green bodies during calcination has also been investigated by thermal analysis, X-ray diffraction, and Raman scattering. In addition, the electrochemical properties of the resultant LiFePO4/carbon composites were examined by the charge-discharge test.