摘要
以Li2SiO3、Mn(CH3COO)·24H2O和TiO2为原料,利用传统高温固相合成法成功合成出Li2Mn0.9Ti0.1SiO4锂离子电池正极材料。采用XRD、FESEM等手段分析了正极材料的相组成、结构和形貌,利用电池测试仪测试了正极材料样品的电化学性能。研究结果表明,固相合成的产物主相为Li2Mn1-xTixSiO4,同时存在少量的杂质,掺杂Ti后,材料表面形貌从近球形转变为非球形颗粒,颗粒尺寸略有增大,为200～500nm。实验结果表明,Ti掺杂以后,Li2MnSiO4正极材料的可逆容量和循环寿命都得到提高。正极材料电化学性能提高的机理在于Ti掺杂稳定了Li2MnSiO4正极材料的结构。
Li2Ti0.1Mn0.9SiO4 cathode material for lithium ion batteries was synthesized by traditional solid-state reaction method taking Li2SiO3, Mn （CH3COO）2· 4H2O and TiO2 as starting materials. XRD and FESEM 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 the sample prepared via solid-state reaction is Li2Mn0.9Ti0.1SiO4, whereas a small amount of impurities exist. The particle size of Li2Mn0.9Ti0.1SiO4 sample is about 200-500 nm and its particle shape is not sphere morphology. The experiment results show that the reversible capacity and cycle life of cathode sample improve through doping Ti, and its mechanism is that doping Ti can stabilize the structure of Li2MnSiO4 cathode material.
出处
《热加工工艺》
CSCD
北大核心
2009年第16期25-28,共4页
Hot Working Technology
