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戴海花,王勇龙,李凯瑞,郑小燕,代正昆,黎业生.基于碳纳米管宏观膜的高比容量及高电化学稳定性钛酸锂负极[J].稀有金属材料与工程(英文),2021,50(5):1781~1786.[DAI Hai-Hua,Wang Yong-Long,Li Kai-Rui,Zheng Xiao-Yan,Dai Zheng-Kun and LI Ye-Sheng.High specific capacity and electrochemical stability lithium titanate negative electrode based on carbon nanotubes macro film[J].Rare Metal Materials and Engineering,2021,50(5):1781~1786.]
High specific capacity and electrochemical stability lithium titanate negative electrode based on carbon nanotubes macro film
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Received:June 29, 2020  
DOI:
Key words: Lithium Ion Battery  Lithium titanate  Carbon nanotubes
Foundation item:国家自然科学(51861009);江西省教育厅科技重点项目(GJJ160596)
Author NameAffiliation
DAI Hai-Hua,Wang Yong-Long,Li Kai-Rui,Zheng Xiao-Yan,Dai Zheng-Kun and LI Ye-Sheng  
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Abstract:
      Changing the structure of lithium titanate (Li4Ti5O12, Abbre. LTO) material by delithiation (activation) in advance, to increase the internal lithium ion vacancy and enhance the lithium intercalation ability, a high specific capacity LTO was prepared; and CMF (carbon nanotubes macro film) was introduced as a current collector instead of metal foil to improve its electrochemical stability; finally, a Li4Ti5O12 electrode having high specific capacity and high stability was obtained. Characterization was executed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical testing. The results show that the activated Li4Ti5O12 can achieve a specific capacity of 192.7 mAh/g at 1C rate, which is about 30 mAh/g higher than that of the normal Li4Ti5O12 material. The introduced CMF current collector can enhance the binding force with the active material, and it still possesses a specific capacity of 150 mAh/g at 5C rate , exhibiting excellent rate performance.