| 碳包覆LiFePO4的结构与性能研究 |
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| 引用本文： | 张冬云,张培新,林木崇,刘琨,袁秋华,许启明,罗仲宽,任祥忠.碳包覆LiFePO4的结构与性能研究[J].无机材料学报,2011(3):265-270. |
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| 作者姓名： | 张冬云 张培新 林木崇 刘琨 袁秋华 许启明 罗仲宽 任祥忠 |
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| 作者单位： | 西安建筑科技大学材料科学与工程学院;广西大学化学化工学院;深圳大学化学与化工学院; |
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| 基金项目： | 国家自然科学基金(50874074,50474092); 广东省自然科学基金(8151806001000028); 深圳市科技计划资助项目(ZYC200903250150A); 深圳市功能高分子重点实验室开放基金(FP20090104)~~ |
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| 摘 要： | 为了研究碳包覆对LiFePO4结构的影响,以柠檬酸为碳源,采用机械活化-高温固相法,合成了不同碳包覆量的LiFePO4/C复合正极材料.通过XRD、SEM、BET、HRTEM、选区电子衍射(SAED)、交流阻抗谱(ACI)和恒电流充放电等现代分析方法,全面研究了碳包覆量不同时,LiFePO4/C复合正极材料的结构、形貌和电化学性能,并对C包覆对结构影响的成因进行了分析.结果表明,柠檬酸高温分解后生成无定形碳非晶物质,在LiFePO4颗粒表面包覆形成一种网络结构,抑制了颗粒的生长;C包覆影响了晶体的生长方向和微观结构,LiFePO4/C的优势生长为121]方向;交流阻抗分析表明包覆后锂离子扩散系数比未改性的LiFePO4提高了两个数量级,且各项阻抗值均降低,从而提高了材料的离子及电子电导性、放电性能和循环性能.
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| 关 键 词： | 锂离子电池 正极材料 LiFePO4 结构 碳包覆 |
Property and Structure of Carbon-coated LiFePO_4 |
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| ZHANG Dong-Yun,ZHANG Pei-Xin,LIN Mu-Chong,LIU Kun,YUAN Qiu-Hua,XU Qi-Ming,LUO Zhong-Kuan,REN Xiang-Zhong.Property and Structure of Carbon-coated LiFePO_4[J].Journal of Inorganic Materials,2011(3):265-270. |
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| Authors: | ZHANG Dong-Yun ZHANG Pei-Xin LIN Mu-Chong LIU Kun YUAN Qiu-Hua XU Qi-Ming LUO Zhong-Kuan REN Xiang-Zhong |
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| Affiliation: | ZHANG Dong-Yun1,2,ZHANG Pei-Xin1,3,LIN Mu-Chong3,LIU Kun2,YUAN Qiu-Hua3,XU Qi-Ming1,LUO Zhong-Kuan3,REN Xiang-Zhong3(1.School of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China,2.School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,3.School of Chemistry and Chemical Engineering,Shenzhen University,Shenzhen 518060,China) |
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| Abstract: | LiFePO4/C composite cathode materials containing different amounts of carbon were fabricated by mechanical activation-high temperature solid state reaction using citric acid as a carbon source,with the aim to study the effect of carbon-coating on LiFePO4 internal structure.The crystal structure,surface morphology and electrochemical properties of the obtained composites coated with various carbon contents were investigated by the techniques of XRD,SEM,BET,HRTEM,SAED,AC Impedance spectra,and constant current... |
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| Keywords: | lithium-ion batteries cathode materials LiFePO4 structure carbon-coating |
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