化工进展 ›› 2019, Vol. 38 ›› Issue (10): 4659-4665.DOI: 10.16085/j.issn.1000-6613.2019-0083

• 材料科学与技术 • 上一篇    下一篇

钛酸锂/石墨烯复合材料及电化学性能

庄晓东1(),李荣兴1(),俞小花1,谢刚1,2,和晓才2,徐庆鑫2   

  1. 1. 昆明理工大学冶金与能源工程学院,云南 昆明 650093
    2. 昆明冶金研究院,云南 昆明 650500
  • 收稿日期:2019-01-11 出版日期:2019-10-05 发布日期:2019-10-05
  • 通讯作者: 李荣兴
  • 作者简介:庄晓东(1990—),男,硕士研究生,研究方向为锂离子电池材料。E-mail:15093215687@163.com
  • 基金资助:
    云南省科技创新强省计划(2016AA008)

Lithium titanate/graphene oxide composite and its electrochemical properties

Xiaodong ZHUANG1(),Rongxing LI1(),Xiaohua YU1,Gang XIE1,2,Xiaocai HE2,Qingxin XU2   

  1. 1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
    2. Kunming Metallurgy Research Institute, Kunming 650031, Yunnan, China
  • Received:2019-01-11 Online:2019-10-05 Published:2019-10-05
  • Contact: Rongxing LI

摘要:

通过固相法制备出钛酸锂(LTO)样品,再将LTO和氧化石墨烯通过水热法制得钛酸锂/还原石墨烯复合材料(LTO-RGO)。通过XRD、SEM、TEM对材料的结构、形貌进行表征,并进行充放电性能测试、交流阻抗测试来检测其电化学性能。结果表明,石墨烯对钛酸锂进行包覆处理不影响钛酸锂材料的晶型结构、无杂相出现。钛酸锂/石墨烯复合材料表现出了比钛酸锂材料更为优异的电化学性能,0.2C倍率下的放电比容量为208.7mA·h/g,50次循环后容量保持率为98.10%;20C倍率下的放电比容量为136.1mA·h/g。

关键词: 固相法, 水热法, 氧化石墨烯, 倍率循环, 交流阻抗, 扩散系数

Abstract:

Lithium titanate (LTO) samples were prepared by solid phase method, and then LTO and graphene oxide were treated by hydro-thermal method to prepare lithium titanate/graphene oxide composite (LTO-RGO). The structure and morphology of the material were characterized by XRD, SEM and TEM, and its electrochemical properties were tested by charge-discharge performance test and AC impedance test. The results showed that the graphene coating treatment of lithium titanate had no effect on the crystal structure of lithium titanate and no impurities appeared. LTO-RGO exhibited excellent electrochemical performance. The discharge specific capacity at 0.2C ratio was 208.7mA·h/g, the capacity retention rate after 50 cycles was 98.10%, and the discharge specific capacity at 20C ratio was 136.1 mA·h/g.

Key words: solid phase method, hydro-thermal method, graphene oxide, rate cycling, AC impedance, coefficient of diffusion

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