【作者】 孙文彬； 谢嫚； 陈人杰； 彭庆文； 刘兴江；

【Author】 Sun wenbin~1;Xie man~1;Chen renjie~1;Peng qingwen~2;Lu zhiwei~2;Liu xingjiang~2 (1.National Key Lab of Power Sources,Tianjin Institute of Power Sources,Tianjin 300381,China 2.Department of Chemical Engineering and Environment,Beijing Institute of Technology,Beijing,100081)

【机构】 中国电子科技集团公司第十八研究所化学与物理电源技术重点实验室； 北京理工大学化工与环境学院；

【摘要】 文献中对LiCoO₂材料的表面包覆已经进行大量的报道,清晰显示LiCoO₂的表面改性对材料循环性能产生了重要正性效应。然而,材料的包覆原理和作用机制直到目前仍然模糊不清,没有一个确定统一定论。本文采用溶胶-凝胶法,结合TiO₂与LiCoO₂体相反应的研究结果,详细地研究了TiO₂对LiCoO₂的包覆效应。发现两者之间在800℃时会发生反应生成Li₂TiO₃和Co₃O₄两种物质,并且生成这两种物质后可以有效提高循环性能。更多还原

【Abstract】 Recently,a lot of efforts were dedicated to the investigation on TiO₂-coated LiCoO₂,indicating that surface-coating produced remarkable improvement in cycle ability.However,the working mechanism of surface-coating is still unclear so far.In this work,in combination with the study on the phase thermal stability of coating materials against LiCoO₂,TiO₂-coated LiCoO₂ was investigated in detail by a sol-gel coating route.When sintered at 800℃,there will a reaction between LiCoO₂ and TiO₂ had happened and will produce Co₃O₄ and Li₂TiO₃.After the reaction,the cycle ability of LiCoO₂ has effective improved.更多还原