溶胶⁃凝胶法合成钛酸锌锂负极材料

Synthesis of Lithium Zinc Titanate Anodes by a Sol⁃Gel Method

王立福 卢汇嘉 许航 包鹏伟 万一行 荀瑞 张重学 王利娟

Lifu WANG Huijia LU Hang XU Pengwei BAO Yihang WAN Rui XUN Zhongxue ZHANG Lijuan WANG

辽宁石油化工大学 石油化工学院，辽宁 抚顺 113001

School of Petrochemical Engineering，Liaoning Petrochemical University，Fushun Liaoning 113001，China

以溶胶?凝胶法制备锂离子电池Li2ZnTi3O8（LZTO）负极材料，考察退火温度和退火时间对LZTO电化学性能的影响，得到了最佳工艺条件：退火温度为700 ℃，退火时间为3 h。在最佳工艺条件下制备的LZTO中添加络合剂柠檬酸进行了改性。结果表明，当金属离子与柠檬酸的物质的量比为2.00∶1.50时，制备的样品LZTO?2/1.50颗粒小、分散均匀，表现出良好的电化学性能；当电流密度为0.5 A/g时，恒流充放电300次后放电比容量为203.6 mA·h/g。

Li2ZnTi3O8 (LZTO) anodes of lithium?ion batteries have been prepared by a sol?gel method. The effects of the calcination temperature and time on the electrochemical performance have been studied for LZTO in detailed. The optimum calcination temperature and time are 700 ℃ and 3 h, respectively. On the basis of the optimum preparation process, citric acid as the chelating agent has been introduced into the synthesis to modify LZTO. When the molar ratio of metal ions to citric acid is 2.00∶1.50, the obtained product is denoted as LZTO?2/1.50, which has small particle size, good dispersion, and then shows good electrochemical performance. The discharge specific capacity is 203.6 mA·h/g after 300 cycles at the current density of 0.5 A /g for LZTO?2/1.50.

辽宁省“兴辽英才计划”项目(XLYC1907025);辽宁石油化工大学第五层次人才基金项目(2018XJJ┫?012）);辽宁省教育厅面上项目(LJKZ0408);辽宁省大学生创新创业训练计划项目(2021101480017)

10.12422/j.issn.1672-6952.2024.01.004