纳米针状Li2MnSiO4正极材料的合成及电化学性能研究
Synthesis of nanoneedle-like Li2MnSiO4 cathode material for lithium-ion batteries and study on its electrochemical properties
李俊鹏 1黄妍青 1戴华平 1丁正平 1任玉荣1
作者信息
- 1. 常州大学材料科学与工程学院,江苏 常州 213164
- 折叠
摘要
基于Li2MnSiO4 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0.1C倍率下,放电比容量达到 217.3 mAh/g.
Abstract
Based on the anisotropic characteristics of Li+ions migration in Li2MnSiO4 structure,a hydrothermal method is proposed to synthesize the nano-grade needle-like Li2MnSiO4 crystals,which can regulate the preferential growth of the crystal plane and improve the electrochemical performance of Li2MnSiO4 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,Li2MnSiO4 cathode materials exhibit good electrochemical performance,delivering a discharge capacity of 217.3 mAh·g-1 at 0.1 C.
关键词
锂离子电池/正极材料/硅酸锰锂/晶面暴露/水热法Key words
lithium ion battery/cathode material/lithium manganese silicate/exposed crystallographic facets/hydrothermal method引用本文复制引用
基金项目
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)
出版年
2024
NETL
NSTL
万方数据