广西师范大学学报（自然科学版） ›› 2022, Vol. 40 ›› Issue (6): 154-162.doi: 10.16088/j.issn.1001-6600.2021080801

• 研究论文 • 上一篇    下一篇

固相反应制备Li2FeSiO4/C及嵌/脱锂性能研究

李付绍*, 徐应仙, 武青青, 邓明森*   

  1. 贵州省纳米材料模拟与计算重点实验室(贵州师范学院),贵州贵阳550018
  • 收稿日期:2021-08-08 修回日期:2021-08-31 出版日期:2022-11-25 发布日期:2023-01-17
  • 通讯作者: 李付绍(1978—),男,贵州思南人,贵州师范学院副教授,博士。E-mail:lifushao@126.com邓明森(1981—),男,湖北恩施人,贵州师范学院副教授,博士。E-mail:deng@gznc.edu.cn
  • 基金资助:
    国家自然科学基金(52062006);贵州省基础研究计划(黔科合基础-ZK[2021]一般237)

Synthesis of Li2FeSiO4/C by Solid-State Reaction and Its Lithium Intercalation/de-Intercalation Property

LI Fushao*, XU Yingxian, WU Qingqing, DENG Mingsen*   

  1. Guizhou Provincial Key Laboratory of Computational Nano-Material Science (Guizhou Education University), Guiyang Guizhou 550018, China
  • Received:2021-08-08 Revised:2021-08-31 Online:2022-11-25 Published:2023-01-17

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摘要： 本文利用直接高温固相反应,合成制备了锂离子电池正极材料Li2FeSiO4及Li2FeSiO4/C,并研究了碳复合改性对Li2FeSiO4的结构、电导率、嵌/脱锂性能、循环比容量等方面的影响。结果表明,材料的制备工艺流程简单易行,有利于规模化生产;碳复合改性有利于提高硅酸盐正极材料的导电性能,改善材料在成相反应后的粒度分布;特别是碳复合改性有利于提高Li2FeSiO4的嵌/脱锂性能和循环比容量,Li2FeSiO4/C在0.1C倍率下首次放电容量高达120 mAh/g以上,大大高于未经复合改性Li2FeSiO4的20 mAh/g。研究表明,Li2FeSiO4是一种很有研究价值和开发潜力的锂离子电池正极材料,碳复合改性可显著克服该材料在电导率、电化学性能等诸多方面所存在的不足和局限。

关键词: 锂离子电池, 硅酸盐, 正极材料, 嵌/脱锂性能, 电化学技术

Abstract: In this paper, Li2FeSiO4 as well as Li2FeSiO4/C was prepared as cathode materials of lithium-ion batteries by direct high temperature solid-sate reaction, and effect of carbonized modification on the structure, electrical conductivity, lithium intercalation/de-intercalation property, and cyclic specific capacity of Li2FeSiO4 was investigated. The result shows that this process of material preparation is economic and scalable. The carbonized composite helps to enhance the electrical conductivity of Li2FeSiO4, and also improves the particle distribution after phase formation reaction of Li2FeSiO4. Most importantly, carbonized composite quite facilitates the lithium intercalation/de-intercalation and greatly promotes the cyclic specific capacity of Li2FeSiO4, and initial discharge capacity of Li2FeSiO4/C under rate of 0.1C reaches above 120 mAh/g, much higher than the 20 mAh/g of Li2FeSiO4. In conclusion, Li2FeSiO4 is a most promising cathode material of lithium-ion batteries, and carbonized modification can overcome the shortcomings of this cathode material in aspects of electrical conductivity, electrochemical performance, and so on.

Key words: lithium-ion batteries, silicates, cathode material, lithium intercalation/de-intercalation property, electrochemical techniques

中图分类号: 

  • TM911
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