锂离子电池正极材料Li_2MnSiO_4固体核磁共振谱研究  

Solid State NMR Studies of Lithium Manganese Silicate as Positive Electrode Materials for Li-ion Batteries

作　　者：程琥[1,2] 刘子庚[2] 李益孝[2] 陈忠[1] 杨勇[2] 

机构地区：[1]厦门大学物理与机电工程学院物理系,福建厦门361005 [2]厦门大学固体表面物理化学国家重点实验室 化学化工学院化学系,福建厦门361005

出　　处：《电化学》2010年第3期296-299,共4页Journal of Electrochemistry

基　　金：国家自然科学基金(20873115);国家重大基础研究计划(2007CB209702)资助

摘　　要：应用水热-溶胶凝胶法合成了Li2MnSiO4正极材料.由XRD、FTIR、固体NMR及恒流充放电等方法表征、分析样品的相组成、晶体结构和电化学性能.结果表明,合成的样品主相为Li2MnSiO4,同时存在少量Li2CO3杂质.该材料的首次放电容量可达190mAh·g-1,但在充放电循环过程中由于结构坍塌、分解导致其容量衰退明显.The Li2MnSiO4 cathode material for lithium ion batteries was synthesized by sol-gel assisted hydrothermal method. XRD,FTIR and SS-NMR were used to study the phase,structure and morphology of obtained samples. Electrochemical performance of cathode material was tested. The results show that the main phase of sample prepared was Li2MnSiO4,whereas a small amount of impurities （ Li2CO3） were existed. The Li2MnSiO4 cathode material gave an initial discharging capacity of about 190 mAh·g -1. But this capacity faded rapidly during the cycling process due to the decomposition of Li2MnSiO4.

关 键 词：LI2MNSIO4 固体核磁共振 正极材料 锂离子电池 

分 类 号：TM912[电气工程—电力电子与电力传动]