Highly reversible electrochemical magnesium/lithium insertion performance in TiO2(B) nanosheets with Ti cationic vacancies

被引：24
作者：
Bi, Hongwei [1 ]
Zhu, Shengli [1 ,3 ]
Liang, Yanqin [1 ,5 ,6 ]
Jiang, Hui [1 ,5 ,6 ]
Li, Zhaoyang [1 ,5 ,6 ]
Wu, Shuilin [1 ,5 ,6 ]
Wei, Hao [4 ]
Chang, Chuntao [2 ]
Cui, Zhenduo [1 ,5 ,6 ]
机构：
[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300350, Peoples R China
[2] Dongguan Univ Technol, Sch Mech Engn, Dongguan 523808, Peoples R China
[3] Lanzhou Jiaotong Univ, Sch Mat Sci & Engn, Lanzhou 730070, Peoples R China
[4] BYD Co Ltd, Cell Dev Dept, Shenzhen 518116, Peoples R China
[5] Tianjin Key Lab Composite & Funct Mat, Tianjin 300350, Peoples R China
[6] Minist Educ, Key Lab Adv Ceram & Machining Technol, Tianjin 300350, Peoples R China
来源：
CHEMICAL ENGINEERING JOURNAL | 2022年 / 442卷
关键词：
TiO2(B) nanosheets; Ti vacancies; Li-ion battery; Mg-ion battery; MG-ION BATTERIES; CATHODE MATERIALS; ANATASE TIO2; LITHIUM;
D O I：
10.1016/j.cej.2022.136146
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Multivalent ion batteries show a promising future. As one of the crucial defects, cationic vacancies can improve diffusion coefficient and electronic conductivity and provide additional metal ions storage sites. Here, we prepare 2D cation-deficient TiO2(B) nanosheets (D-TiO2(B)) through the substitute of O by F. The D-TiO2(B) exhibits excellent properties of charge transfer and electrochemical kinetics. In the Mg-ion battery, the D-TiO2(B) electrode delivers a high reversible capacity of 129.4 mAh g(-1) at 100 mA g(-1) after 200 cycles. Furthermore, the DTiO2(B) electrode also displays high specific capacity, good long-cycling stability and rate capability in Li-ion battery. The improved electrochemical performance is attributed to the elevated diffusion coefficient, abundant energy storage sites and reduced interface resistance due to cation vacancies and F.
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页数：8
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