Page 58 - 《精细化工》2023年第2期

第 40 卷第 2 期 精 细 化 工 Vol.40, No.2
20 23 年 2 月 FINE CHEMICALS Jan. 2023

功能材料
钇掺杂钛酸锂/氧化石墨烯纳米复合材料的

合成与电化学性能

闫共芹，袭沂东，祝玉婷

（广西科技大学 机械与汽车工程学院，广西 柳州 545616）

摘要：以氧化石墨烯（GO）为基底，钛酸四丁酯、一水合氢氧化锂、六水合硝酸钇为原料，十六烷基三甲基溴
化铵为表面活性剂，采用溶剂热法合成前驱体，在 N 2 气氛保护下高温煅烧合成了钇掺杂钛酸锂/氧化石墨烯纳
米复合材料。采用 SEM、XRD、EDS、Raman 对复合材料进行了形貌、结构和成分表征。将复合材料用作锂离
子电池负极材料，采用循环伏安法、恒流充放电循环法研究了其电化学性能。结果表明，片状钛酸锂包覆在氧
化石墨烯片上形成了钇掺杂钛酸锂/氧化石墨烯纳米复合材料。在 100 mA/g 的电流密度下，钇掺杂量为 8%（以
钛酸锂的物质的量为基准，下同）的纳米复合材料的首次放电比容量为 145.5 mA·h/g，经过 100 圈充放电循环
后容量衰减几乎为 0，经过 200 圈循环后容量衰减 1.59%，经过 300 圈循环后容量衰减 3.24%，与目前容量保持
率只有 80%左右的石墨负极相比有明显的改进。钇元素的掺杂和钛酸锂包覆氧化石墨烯形式的复合材料可以减
小钛酸锂电极在充放电循环中的极化程度，从而改善了材料的循环性能。
关键词：钇掺杂钛酸锂/氧化石墨烯纳米复合材料；溶剂热-煅烧合成；锂离子电池；负极材料；电化学性能；功能
材料
中图分类号：TB34；TQ152 文献标识码：A 文章编号：1003-5214 (2023) 02-0280-10

Synthesis and electrochemical properties of yttrium-doped
lithium titanate/graphene nanocomposites

YAN Gongqin, XI Yidong, ZHU Yuting
（School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou 545616,
Guangxi, China）

Abstract: Yttrium-doped lithium titanate/graphene oxide nanocomposites were synthesized by calcination
of nanocomposite precursor, which was prepared by solvothermal method using graphene as base,
tetrabutyl titanate, lithium hydroxide monohydrate and yttrium nitrate hexahydrate as raw materials, and
hexadecyl trimethyl ammonium bromide as surfactant, at high temperature under the protection of N 2
atmosphere. The morphology, structure and composition of the nanocomposites obtained were then
characterized by SEM, XRD, EDS, Raman spectroscopy. The nanocomposites were further used in lithium-
ion battery as anode material, and their electrochemical properties were evaluated by cyclic voltammetry
and constant current charge-discharge cycle method. The results showed that yttrium-doped lithium
titanate/graphene nanocomposites had a morphology of graphene sheets coated with flake lithium titanate.
Under a current density of 100 mA/g, the nanocomposites with a yttrium dopping amount 8%(based on the
amount of substance of lithium titanate, the same below) exhitbited an initial discharge capacity of 145.5 mA·h/g,
and its capacity fading was 0 after 100 charge-discharge cycles, 1.59% after 200 cycles, and 3.24% after
300 cycles, which was significantly improved compared with the graphite anode whose capacity retention
rate was only about 80%. The doping of yttrium and graphene coated with lithium titanate reduced the
polarization degree of lithium titanate electrode in the charge and discharge cycle and improved the cycle

收稿日期：2022-06-12; 定用日期：2022-09-05; DOI: 10.13550/j.jxhg.20220545
基金项目：广西自然科学基金（2020GXNSFAA159024）；柳州市科技计划项目（2018DH10507）；广西科技大学 2022 年硕士研究生创
新项目（GKYC202216）
作者简介：闫共芹（1982—），男，博士，副教授，E-mail：ygq@gxust.edu.cn。