TiO_(2)掺杂、树脂包覆的SiO_(x)复合物作为锂离子电池负极材料的研究  

A study on TiO_(2)-doped and resin-coated SiO_(x) composites as anode materials for lithium-ion batteries

作　　者：胡乃琪 张春媚 邓雯雯 HU Naiqi;ZHANG Chunmei;DENG Wenwen(School of Materials Science and Engineering,SUST,Suzhou 215009,China)

机构地区：[1]苏州科技大学材料科学与工程学院,江苏苏州215009

出　　处：《苏州科技大学学报(自然科学版)》2025年第1期50-58,共9页Journal of Suzhou University of Science and Technology(Natural Science Edition)

基　　金：电分析化学国家重点实验室开放基金项目(SKLEAC202203);苏州科技大学自然科学基金项目(22202143)。

摘　　要：球磨结合高温烧结法制备得到TiO_(2)掺杂的SiO_(0.4)材料,表面包覆树脂(RF)后高温碳化,生成均匀的碳层,以此作为锂离子电池硅氧基负极材料。通过合成不同摩尔比的SiO_(0.4)∶TiO_(2)(9∶1,8∶2,7∶3)复合材料,发现材料的循环稳定性随着TiO_(2)的增加而增加,比容量逐渐降低。综合考虑,选取SiO_(0.4)∶TiO_(2)=8∶2的材料包覆树脂(RF),产物记为SiO_(0.4)@TiO_(2) 8 2 15H@RF。电化学测试结果表明:SiO_(0.4)@TiO_(2)8 2 15H@RF材料的倍率性能表现优异,在800 mA·g^(-1)大电流密度下,充电比容量为280.4 m Ah·g^(-1)。当电流密度恢复到100 mA·g^(-1)时,SiO_(0.4)@TiO_(2)@RF复合材料的可逆容量恢复到485.5 mAh·g^(-1),容量保持率为92.0%,表现出较好的应用前景。TiO_(2) doped SiO_(0.4) materials were prepared by ball milling combined with high temperature sintering.The surface was coated with resin(RF)and carbonized at high temperature to form a uniform carbon layer,which was used as the silicon oxide anode material for lithium-ion batteries.Through the synthesis of SiO_(0.4)∶TiO_(2)(9∶1,8∶2,7∶3)composites with different molar ratios,it is found that the cyclic stability of the materials increases with the increase of TiO_(2),and that the specific capacity decreases gradually.After comprehensive consideration,the material coated resin(RF)with SiO_(0.4)∶TiO_(2)=8∶2 was selected,and the product was recorded as SiO_(0.4)@TiO_(2)[e-mail] electrochemical test results show that SiO_(0.4)@TiO_(2)8215H@RF composite material has excellent rate performance,and that the charging specific capacity is 280.4 mAh·g^(-1) at a large current density of 800 mA·g^(-1).When the current density returned to 100 mA·g^(-1),the reversible capacity of SiO_(0.4)@TiO_(2)8215H@RF composite recovered to 485.5 mAh·g^(-1),and the capacity retention rate was 92.0%,showing a good application prospect.

关 键 词：硅氧基负极 TiO_(2)掺杂 树脂包覆 

分 类 号：TM912.9[电气工程—电力电子与电力传动]