Effect of rich R-TiO2 on the rate and cycle properties of Li4Ti5O12 as anode for lithium ion batteries

查看全文 作　　者：Delai [1]Qian;Yijie [1]Gu;Shuainan [2]Guo;Hongquan [1]Liu;Yunbo [3]Chen;Juan [1]Wang;Guoxuan [1]Ma;Chuan [2]Wu

机构地区：[1]College of Materials Science and Engineering,Shandong University of Science and Technology.Qingdao 266510,Shandong,China;[2]Beijing Key Laboratory of Environmental Science and Engineering,School of Materials Science & Engineering,Beijing Institute of Technology,Beijing 100081,China;[3]Advanced Manufacture Technology Center,China Academy of Machinery Science and Technology,Beijing 100044,China

出　　处：《Journal of Energy Chemistry》索引2019年第28卷第5期,共7页

基　　金：financially supported by the National Natural Science Foundation of China(No.51641206);Shandong Natural Science Foundation Project(No.ZR2015EM013);Special Funds for Independent Innovation and Transformation of Achievements in Shandong Province(No.2014CGZH0911);National Key R&D Program of China(No.2016YFB0100508) 摘　　要：Li4Ti5012 (LTO) with rich R-TiO2 (17.06, 23.69, and 34.42 wt%), namely, R-TiO2@Li4Ti5O12 composites, were synthesized using the hydrothermal method and tetrabutyl titanate (TBT) as the precursor. Rietveld refinement of X-ray diffraction (XRD) results show that the proportion of Li occupying 16d sites is extraordinary low and the lattice constants of LTO and R-TiO2 change with the ritanium dioxide content. EIS measurements showed that with in creasing R-TiO2 content, both its charge transfer impedance (Rct) and lithium ion diffusion coefficient (DLi) decreased. The changes of Rct and DLi caused by the increase of titanium dioxide content have synergic-antagonistic effects on the rate and cycle properties of Li4Ti5012. The rate performance is positively related to DLi, while the cycle property is negatively correlated with Rct, indicati ng that the rate performs nee is mainly related to DLi, while Rct more significantly affects the cycle performance. LTO-RT-17.06% exhibited excellent rate properties, especially under a high current density (5.0 C, 132.5 mAh/g) and LTO-RT-34.42% showed superior long-term cycle performance (0.012% capacity loss per cycle) compared to that of LTO-RT-17.06% and LTO-RT-23.69%. 关键词：LI4TI5O12 R-TiO2 content RATE and CYCLE properties Charge transfer impedance LI-ION diffusion coefficient

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Effect of rich R-TiO2 on the rate and cycle properties of Li4Ti5O12 as anode for lithium ion batteries

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