Li_(1.2)Ni_(0.2)Mn_(0.6)O_2溶胶-凝胶制备与电化学性能研究  

Study on preparation and electrochemical characterization of Li_(1.2)Ni_(0.2)Mn_(0.6)O_2 by sol-gel method

作　　者：孙镇[1] 向延鸿[1,2] 李剑[1,2] 吴贤文 刘志雄 伍建华[1] 熊利芝 何则强 吴显明 

机构地区：[1]吉首大学物理与机电工程学院,湖南吉首416000 [2]锰锌钒产业技术湖南省2011协同中心,湖南吉首416000

出　　处：《现代化工》2017年第5期85-88,共4页Modern Chemical Industry

基　　金：国家自然科学基金资助项目(51662010;51364009;51262008;51472107和51672104);湖南省自然科学基金资助项目(2016JJ6121);湖南省教育厅优秀青年项目(15B190和16B209);吉首大学大学生研究性学习与创新实验计划(94);吉首大学校级科研课题;吉首大学实验室开放基金(JDLF2016010;JDLF2016009;JDLF2016016)

摘　　要：采用溶胶-凝胶法合成富锂锰基(Li_(1.2)Ni_(0.2)Mn_(0.6)O_2)正极材料,考察反应pH对材料结构、形貌及电化学性能的影响。X射线衍射(XRD)分析结果表明,制备的材料(Li_(1.2)Ni_(0.2)Mn_(0.6)O_2)结晶良好,均为理想层状结构的富锂锰基材料。扫描电子显微镜(SEM)分析结果显示,pH 7.0时制得的材料颗粒细小,分散均匀。充放电性能测试结果显示,pH 7的样品具有良好的电化学性能,在2.0~4.8 V以0.05 C充放电时,首次容量达到263 m Ah/g。同时具有良好的倍率性能,1.0 C放电容量达到200 m Ah/g。Li-rich Mn-based cathode materials（ Li1.2Ni0.2Mn0.6O2） have been synthesized by a sol-gel method. The influence of reaction pH on the structure,morphology and electrochemical performance respectively of Li1.2Ni0.2Mn0.6O2 has been studied. XRD results show that the prepared Li1.2Ni0.2Mn0.6O2 crystallizes well and exhibits ideal laminated structure of Li-rich Mn-based cathode materials. SEM results indicate that the particles of sample material synthesized at pH = 7 displays more dispersed and smaller than other samples. Electrochemical charge/discharge measurements in lithium-ion cells indicate that the material synthesized at pH = 7 exhibits excellent electrochemical performance. Its first capacity can reach 263 m Ah/g when charging/discharging at 2. 0-4. 8V,0. 05 C,and its discharge capacity at 1. 0 C can reach 200 m Ah/g,1. 0 C,showing a good doubling performance.

关 键 词：锂离子电池 富锂锰基 正极材料 溶胶-凝胶法 

分 类 号：TM912[电气工程—电力电子与电力传动]