LiMn_2O_4与Li_(1.5)Al_(0.5)Ge_(1.5)(PO_4)_3/Li_7La_3Zr_2O_(12)的复合正极材料制备及性能研究

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英文篇名：Preparation and Properties of Composite Cathode Materials of LiMn_2O_4 and Li_(1.5)Al_(0.5)Ge_(1.5)(PO_4)_3/Li_7La_3Zr_2O_(12) 作者：蓝凌霄 ; 吴秋满 ; 王云婷 ; 吴希 ; 梁兴华 英文作者：LAN Ling-xiao;WU Qiu-man;WANG Yun-ting;WU Xi;LIANG Xing-hua;Guangxi Key Laboratory of Auto Parts and Vehicle Technology Guangxi University of Science and Technology;Guangdong Academy of Sciences Institute of New Materials; 关键词：LiMn_2O_4 ; Li_(1.5)Al_(0.5)Ge_(1.5)(PO_4)_3 ; Li_7La_3Zr_2O_(12) ; 复合正极材料 ; 电化学性能 英文关键词：LiMn_2O_4;;Li_(1.5)Al_(0.5)Ge_(1.5)(PO_4)_3;;Li_7La_3Zr_2O_(12);;composite positive electrode material;;electrochemical performance 中文刊名：GXJX 英文刊名：Equipment Manufacturing Technology 机构：广西汽车零部件与整车技术重点实验室广西科技大学;广东省新材料研究所; 出版日期：2019-05-15 出版单位：装备制造技术 年：2019 期：No.293 基金：广西汽车零部件与整车技术重点实验室自主研究课题(2017GKLACVTZZ04);; 广西科技大学研究生教育创新计划项目(YCSW2018202,YCSW2019210);广西科技大学创新团队支持计划资助项目(No.3);; “广东省科学院实施创新驱动发展能力建设专项资金”项目(2017GDAS CX-0202) 语种：中文; 页：GXJX201905016 页数：4 CN：05 ISSN：45-1320/TH 分类号：63-66

摘要

正极材料在锂离子电池服役过程中的电化学稳定性是目前研究的热点之一,研究锰酸锂复合正极材料,探索改善正极材料电化学稳定性的工艺与方法。采用高温固相法制备LiMn_2O_4和NISICON结构的Li_(1.5)Al_(0.5)Ge_(1.5)(PO_4)_3、石榴石结构的Li_7La_3Zr_2O_(12),将LiMn_2O_4和Li_(1.5)Al_(0.5)Ge_(1.5)(PO_4)_3/Li_7La_3Zr_2O_(12)以9∶1的比例混合制备复合正极材料。利用X射线衍射仪分析其物理性能,组装成扣式电池,通过恒流充放电测试、循环伏安测试、阻抗测试等进行电化学性能分析。结果表明,LiMn_2O_4/Li_(1.5)Al_(0.5)Ge_(1.5)(PO_4)_3复合正极材料和LiMn_2O_4/Li_7La_3Zr_2O_(12)复合正极材料依然为尖晶石结构,材料结晶度良好。其中,LiMn_2O_4/Li_(1.5)Al_(0.5)Ge_(1.5)(PO_4)_3复合正极材料衍射峰相对尖锐,峰强较大。充放电测试表明,LiMn_2O_4/Li_(1.5)Al_(0.5)Ge_(1.5)(PO_4)_3复合正极材料的放电比容量比LiMn_2O_4/Li_7La_3Zr_2O_(12)复合正极材料的放电比容量高,化学反应的可逆性更佳。所以,LiMn_2O_4/Li_(1.5)Al_(0.5)Ge_(1.5)(PO_4)_3复合正极材料的性能优于LiMn_2O_4/Li_7La_3Zr_2O_(12)复合正极材料。
        LiMn_2O_4 and LiLi_(1.5)Al_(0.5)Ge_(1.5)(PO_4)_3Al_(0.5)Ge_(1.5)(PO_4)_3、Li_7La_3Zr_2O_(12) were prepared by high temperature solid state method.Composite cathode materials were prepared by mixing LiMn_2O_4 and Li_(1.5)Al_(0.5)Ge_(1.5)(PO_4)_3/Li_7La_3Zr_2O_(12) at 9 ∶1.The physical properties of the battery were analyzed by x-ray diffractometer,and the electrochemical performance of the battery was analyzed by constant current charge-discharge test,cyclic volt-ampere test and impedance test.The results show that LiMn_2O_4/Li_(1.5)Al_(0.5)Ge_(1.5)(PO_4)_3 composite cathode material and LiMn_2O_4/Li_7La_3Zr_2O_(12) composite cathode material are still spinel structure,and the crystallization degree of the material is good.Among them,the diffraction peak of LiMn_2O_4/Li_(1.5)Al_(0.5)Ge_(1.5)(PO_4)_3 composite cathode material is relatively sharp and the peak strength is large.The charge-discharge test shows that the discharge specific capacity of LiMn_2O_4/Li_(1.5)Al_(0.5)Ge_(1.5)(PO_4)_3 composite cathode material is higher than that of LiMn_2O_4/Li_7La_3Zr_2O_(12) composite cathode material,and the reversibility of chemical reaction is better.Therefore,the properties of LiMn_2O_4/Li_(1.5)Al_(0.5)Ge_(1.5)(PO_4)_3 composite cathode material are better than those of LiMn_2O_4/Li_7La_3Zr_2O_(12) composite cathode material.

引文

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