摘要
为研究钛含量对硅钛复合材料储锂性能的影响,将钛质量百分数含量分别为3.3%、6.4%和8%的硅钛复合物组装成锂离子电池负极并测试其电化学储锂能力。结果表明,钛的加入未改变活性物质硅的嵌/脱锂反应电位,但对负极的储锂能力影响显著。随着钛含量的增加,硅钛复合物的首次嵌锂比容量降低,首次库伦效率增大,当钛含量为8%时,负极的储锂能力最佳:首次嵌锂比容量为2107.02 mAh/g,首次库伦效率为89.95%,经过经50圈循环后,容量保持率高达80.72%,平均衰减率仅有0.38%/圈。
In order to investigate effect of titanium concentration on lithium-storage performance of silicon-titanium composite,silicon-titanium composite with titanium mass fraction of 3.3%,6.4%and 8%was selected as anode of lithium-ion battery to investigate its electrochemical performance.The results suggest that addition of titanium is independent on lithiation/delithiation reaction potentials of active silicon,but affects lithium-storage performance of anode greatly.The first lithiation specific capacity of silicon-titanium composite drops and initial columbic efficiency of anode rises with increase of titanium concentration in silicon-titanium composite.When titanium concentration is 8%,lithiation-storage performance of anode reaches the best values with the first discharge specific capacity of 2107.02 mAh/g and initial columbic efficiency of 89.95%.After cycling for 50 times,the specific capacity retention ratio of anode is 80.72%with average capacity decaying ratio of 0.38%per-cycle.
作者
张英杰
周忠仁
董鹏
张举峰
夏广辉
施晗程
ZHANG Ying-jie;ZHOU Zhong-ren;DONG Peng;ZHANG Ju-feng;XIA Guang-hui;SHI Han-cheng(Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China;National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology, Kunming 650093, China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2020年第4期71-74,共4页
Nonferrous Metals（Extractive Metallurgy)
基金
国家自然科学基金资助项目(51804148)
云南省应用基础研究计划项目(2018FD038)。
关键词
硅钛负极
钛含量
储锂性能
锂离子电池负极
silicon-titanium anode
titanium concentration
lithiation-storage performance
lithium-ion battery anode
