烧结温度对LiNi0.7Co0.1Mn0.2O2三元正极材料结构和电化学性能的影响  

Influence of Sintering Temperature on Structure and Electrochemical Performance of LiNi0.7Co0.1Mn0.2O2 Ternary Anode Material

作　　者：赵霞妍[1] 罗加悦 杨志伟[1] 王烉然 王振宇[1] 朱凌云 ZHAO Xia-yan;LUO Jia-yue;YANG Zhi-wei;WANG Huan-ran;WANG Zhen-yu;ZHU Ling-yun(Guilin Electrical Equipment Scientific Research Institute Co., Ltd., Guangxi Guilin 541004, China)

机构地区：[1]桂林电器科学研究院有限公司

出　　处：《电工材料》2019年第3期13-16,24,共5页Electrical Engineering Materials

基　　金：“1020”创新驱动计划重大攻关“高能量密度动力电池系统及关键技术研究”项目(20160203);广西科技重大专项“高能量密度全固体锂电池用硫化物固体电解质”项目(桂科AA17204061)

摘　　要：将通过化学共沉淀法合成的Ni0.7Co0.1Mn0.2(OH)2三元前驱体与锂源LiOH·H2O混合均匀,用高温固相反应法合成LiNi0.7Co0.1Mn0.2O2三元正极材料。采用XRD、SEM、恒电流充放电电池测试系统和电化学工作站对高温烧结合成的三元正极材料的晶体结构、颗粒形貌和电化学性能进行研究。结果表明,在850℃下高温煅烧合成的LiNi0.7Co0.1Mn0.2O2材料具有最优的组织结构、微观形貌和电化学性能。0.2 C倍率下首次放电比容量达到191.5 mAh/g,1.0 C倍率下循环50圈后的放电比容量为178.3 mAh/g,容量保持率达96.5%。The Ni0.7Co0.1Mn0.2(OH)2 precursor was prepared by chemical coprecipitation process in this paper, and LiNi0.7 Co0.1Mn0.2O2 ternary anode material was synthesized by calcining a mixture of LiOH·H2O and Ni0.7Co0.1Mn0.2(OH)2 precursor. X-ray diffraction (XRD), scanning electron microscope (SEM), galvanostatic charge/discharge battery test system and electrochemical workstation were used to research the lattice structure, particle morphology and electrochemical performance of the ternary anode material which prepared by high temperature sintering. The results stated that the LiNiO.7Co0.1 Mn0.2O2 calcined at 790 ℃ for 8 h can obtain best crystal structure, microtopography and electrochemical performance. It delivered a high initial discharge capacity of 191.5 mAh/g at 0.2 C, and after 50 cycles the discharge capacity of 1.0 C was 178.3 mAh/g, the capacity retention rate was high to 96.5%.

关 键 词：高镍三元正极材料 高温固相反应 分段烧结 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]