高容量锂离子电池Li_2MnSiO_4/C正极材料的合成和电化学性能研究（英文）  

Synthesis and Electrochemical Performance of Li_2MnSiO_4/C as Cathode Materials with High Capacity for Lithium ion Batteries

作　　者：杨蓉[1] 刘晓艳[1] 邓坤发 曲冶[1] 雷京[1] 路蕾蕾[1] 

机构地区：[1]西安理工大学,陕西西安710048

出　　处：《稀有金属材料与工程》2015年第11期2707-2710,共4页Rare Metal Materials and Engineering

基　　金：International Science Technology Cooperation Program of China(2015DFR50350);Specialized Research Fund for the Doctoral Program of Higher Education(20116118120017);Scientific Research Program Funded by Shaanxi Provincial Education Department(2014JK1531);Innovation Project of Xi'an Institute of Technology(2014CX024)

摘　　要：在三元液相体系中合成了球形Li2MnSiO4/C复合正极材料,XRD、SEM和电化学性能测试对材料进行了表征。XRD测试表明Li2MnSiO4具有正交结构,对应Pmn21空间群。SEM显示所得样品为小于1μm的球形颗粒。将Li2MnSiO4/C组装成扣式电池进行电化学测试的结果表明,在1.54.6 V,该样品的初始充电容量达310 mAh/g,放电容量高至286 mAh/g,为理论比容量的85.9%;循环30次后放电比容量为142 mAh/g。Carbon-coated lithium manganese silicate（Li2MnSiO4/C） spherical composite particles were synthesized by solution process in a ternary system.X-ray diffraction（XRD） test of the obtained materials displays that the Li2MnSiO4 is crystallized in an orthorhombic structure with a space group of Pmn21.Scanning electron microscopy（SEM） images of the obtained samples show that the particles are spherical with less than 1 μm sizes.The composite prepared through ternary system shows good performance as cathode materials in lithium cells at room temperature.The charge capacity of the Li2MnSiO4/C samples is 310 mAh/g,and the discharge capacity is 286 mAh/g in the first cycle in the voltage range of 1.54.6 V.A good capacity cycling maintenance of 142mAh/g after 30 cycles is obtained.

关 键 词：锂离子电池 正极材料 LI2MNSIO4 三元液相体系 

分 类 号：TB33[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]