锂离子电池LiFePO4/Li3V2(PO4)3复合正极材料的制备及性能研究

秦显忠a,b,蔡飞鹏a,b，王波a,b，蒋波a,b，姜桂林a,b

• 收稿日期:2020-03-06 出版日期:2020-10-08 发布日期:2020-09-27

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• 作者简介:秦显忠（1988—），女，助理研究员，研究方向为电池材料。Tel:13583198590,E-mail: qinxz@sderi.cn

• 基金资助:

  山东省重点研究发展计划（2017CXGC0502，2019GGX103038）；山东省科学院国际科技合作项目（2019GHPY17）

摘要： 为了提高LiFePO4正极材料的离子导电性，采用液相共沉淀法与碳热还原法制备一系列质量配比的LiFePO4/Li3V2(PO4)3复合材料，通过X-射线衍射、扫描电镜、恒流充放电测试仪等分析测试手段测试样品。研究发现，m(LiFePO4):m(Li3V2(PO4)3)=6:4时复合材料形貌较为规则且结晶度较高，在0.1C，1.0C，2.0C，5.0C，10.0C倍率下放电比容量可达148，136，130.5 ，121.5，112.3 mA·h·g-1，1C倍率下循环100次容量保持率仍可达98.5%，有效地解决了LiFePO4离子电导率低的问题，推动了该复合正极材料在动力型锂离子电池中的应用。

关键词: 锂离子电池, 正极材料, 液相共沉淀法, 倍率性能, 循环性能

Abstract: LiFePO4/Li3V2(PO4)3composite cathode materials with a series of mass ratios were synthesized using the liquid-phase co-precipitation method and carbon thermal-reduction process to improve the electronic conductivity of LiFePO4 cathodes. X-ray diffraction, scanning electron microscopy, constant-current charge and discharge testing, and other analytical methods were used to analyze the phase composition, morphology, and electrochemical performance of the composites. When the mass ratio of LiFePO4 and Li3V2(PO4)3 was 6:4, the composite exhibited regular morphology, higher crystallinity, and the best electrochemical performance: the discharge capacity was 148, 130.5, 121.5,and 112.3 mA·h·g-1 at rates of 0.1C, 1.0C, 2.0C, 5.0C, and 10.0C, respectively, and the capacity remained above 98.5% after 100 cycles at 1C. This effectively solves the problem of low conductivity of the LiFePO4 material and will accelerate its application in power lithium-ion batteries.

Key words: lithium-ion batteries, cathode material, liquid-phase co-precipitation, rate capability, cycle life

引用本文

秦显忠, 蔡飞鹏, 王波, 等. 锂离子电池LiFePO4/Li3V2(PO4)3复合正极材料的制备及性能研究[J]. 山东科学, 2020, 33(5): 67-72.

QIN Xian-zhong, CAI Fei-peng, WANG Bo , et al. Preparation and properties of LiFePO4/Li3V2 (PO4)3  composite cathode material for lithium-ion batteries[J]. Shandong Science, 2020, 33(5): 67-72.

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