LiFePO4/CuO/Ag/RGO四元复合材料的制备与电化学性能研究

刘家伟, 于洪珺, 张玉环, 陈均青, 卑凤利*

化工新型材料 ›› 2018, Vol. 46 ›› Issue (9) : 117 -120.

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化工新型材料 ›› 2018, Vol. 46 ›› Issue (9) : 117-120.
新材料与新技术

LiFePO4/CuO/Ag/RGO四元复合材料的制备与电化学性能研究

    刘家伟, 于洪珺, 张玉环, 陈均青, 卑凤利*
作者信息 +

Synthesis and electrochemical performance of LiFePO4/CuO/Ag/RGO anode material

  • Liu Jiawei, Yu Hongjun, Zhang Yuhuan, Chen Junqing, Bei Fengli
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摘要

采用水热法、化学沉积法、有机溶剂还原法,逐步合成了择优生长、石墨烯基复合材料包覆改性的锂离子电池四元复合正极材料LiFePO4/CuO/Ag/RGO。分别采用XRD、TEM和循环充放电等手段对材料进行性能表征。结果表明,包覆后的LiFePO4呈橄榄石型结构,包覆材料未对LiFePO4结构和晶型产生影响。所制备的材料呈现择优生长的棒状结构,石墨烯基复合材料将LiFePO4包覆,构成稳定的导电网络。电化学性能测试表明,改性后的复合材料在0.2C倍率下首次充放电比容量最高达到166mA·h/g。即使在50C高倍率下首次放电比容量依然达到87.9mA·h/g,表现出优良的的倍率和循环稳定性。

Abstract

Quaternary composite anode material LiFePO4/CuO/Ag/RGO for lithium ion battery coated by graphene matrix composite was gradually synthesized by the hydrothermal,chemical precipitation and organic solvent reduction methods.The properties of products were characterized by XRD,TEM and charge-discharge cycle performance.The results indicated that these materials were highly crystallized with olivine-related structure,and the cladding materials did not affect its structure.The material presented rodlike structure and graphene matrix composites coating LiFePO4 forming a stable conductive network.The initial discharge special capacity was 166mA·h/g at 0.2C and even under higher rate of 50C,the discharge specific capacity still reached 87.9mA·h/g,showing excellent electrochemical properties.

关键词

锂离子电池 / LiFePO4/CuO/Ag/RGO / 包覆改性 / 正极材料

Key words

lithium ion battery / LiFePO4/CuO/Ag/RGO / coating modification / anode material

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LiFePO4/CuO/Ag/RGO四元复合材料的制备与电化学性能研究[J]. 化工新型材料, 2018, 46(9): 117-120 DOI:

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