摘要
基于Li_(2)MnSiO_(4)结构锂离子迁移的各向异性特征,提出了一种调控材料晶面生长取向的水热合成方法,以提高材料的电化学性能。利用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)以及X射线光电子能谱(XPS)等对产物进行表征。结果表明,产物呈纳米针状(长为200 nm,宽度为30 nm),具有特定晶面暴露的特征。其特殊的纳米结构展现出良好的电化学性能,在0.1 C倍率下,放电比容量达到217.3 mAh/g。
Based on the anisotropic characteristics of Li+ions migration in Li_(2)MnSiO_(4)structure,a hydrothermal method is proposed to synthesize the nano-grade needle-like Li_(2)MnSiO_(4)crystals,which can regulate the preferential growth of the crystal plane and improve the electrochemical performance of Li_(2)MnSiO_(4)cathode material.The crystal structure and morphology of the products are characterized by using X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and X-ray photoelectron spectroscopy(XPS).It is shown that the product displays a nanoneedle-like morphology(200 nm in length and 30 nm in width)with a specific face-exposed structure.Benefitting from the particular nanoneedle morphology,Li_(2)MnSiO_(4)cathode materials exhibit good electrochemical performance,delivering a discharge capacity of 217.3 mAh·g^(-1)at 0.1 C.
作者
李俊鹏
黄妍青
戴华平
丁正平
任玉荣
LI Jun-peng;HUANG Yan-qing;DAI Hua-ping;DING Zheng-ping;REN Yu-rong(School of Materials Science&Engineering,Changzhou University,Changzhou 213164,China)
出处
《现代化工》
CAS
CSCD
北大核心
2024年第1期114-119,共6页
Modern Chemical Industry
基金
国家自然科学基金项目(52203291)
常州市社会发展项目应用基础研究计划(CJ20210079)
常州市领军型创新人才引进培育项目(CQ20210099)。
关键词
锂离子电池
正极材料
硅酸锰锂
晶面暴露
水热法
lithium ion battery
cathode material
lithium manganese silicate
exposed crystallographic facets
hydrothermal method