Volume 7 Issue 4
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Article Navigation >  Green Energy&Environment  > 2022  >  7(4): 734-741
Huiqin Wang, Fengchu Zhang, Jing Xia, Fei Lu, Bo Zhou, Ding Yi, Xi Wang. Engineering electronic structures of titanium vacancies in Ti1-xO2 nanosheets enables enhanced Li-ion and Na-ion storage. Green Energy&Environment, 2022, 7(4): 734-741. doi: 10.1016/j.gee.2020.11.006
Citation: Huiqin Wang, Fengchu Zhang, Jing Xia, Fei Lu, Bo Zhou, Ding Yi, Xi Wang. Engineering electronic structures of titanium vacancies in Ti1-xO2 nanosheets enables enhanced Li-ion and Na-ion storage. Green Energy&Environment, 2022, 7(4): 734-741. doi: 10.1016/j.gee.2020.11.006
shu

Engineering electronic structures of titanium vacancies in Ti1-xO2 nanosheets enables enhanced Li-ion and Na-ion storage

doi: 10.1016/j.gee.2020.11.006

  • a Key Laboratory of Luminescence and Optical Information, Ministry of Education, Department of Physics, School of Science, Beijing Jiaotong University, Beijing, 100044, China;

  • b Institute of Molecular Plus, Tianjin University, Tianjin, 300072, China;

  • c Chemistry and Chemical Engineering Guangdong Laboratory, Shantou, 515031, China

Funds:

T Cooperation Projects of China” from the Ministry of Science and Technology of China (Grant No. 2018YFE0124600), “the Fundamental Research Funds for the Central Universities” (Grant No. 2018JBZ107), and the Chemistry and Chemical Engineering Guangdong Laboratory (Grant No. 1932004). The authors also appreciate the support from the “Excellent One Hundred” project of Beijing Jiaotong University.

This work was supported financially by the National Natural Science Foundation of China (Grant Nos. 91961125 and 21905019), “Key Program for International S&

  • Received date 17 August 2020, Accepted date 12 November 2020, RevRecd date 15 October 2020, Publish date 22 November 2020,
    Abstract
  • Up to now, three kinds of ion-storage mechanisms are summarized towards anode materials in lithium/sodium-ion batteries, but they have low capacity and poor cyclic performance. Therefore, it is necessary to develop a new approach to optimize ion storage. Herein, we report an adsorption/desorption storage route through engineering electronic structure of cation-deficient Ti1-xO2 nanosheets. Ti1-xO2 nanosheets indeed exhibit higher capacity (332.1 mA h g-1 vs. 137.7 mA h g-1 for LIBs, 195.7 mA h g-1 vs. 111 mA h g-1 for SIBs), and more stable cyclic performance (296 mA h g-1 vs. 99 mA h g-1 for LIBs, 178.1 mA h g-1 vs. 80.2 mA h g-1 for SIBs after 100 cycles) at 0.1 A g-1 than TiO2 nanosheets. Kinetics analysis and density functional theory (DFT) calculations reveal that electronic structures of vacancy within Ti1-xO2 nanosheets encourage a novel adsorption-desorption storage route. These results highlight the benefits of the engineered electronic structures within electrode material and implement novel ion-storage mechanism towards broad energy storage applications.

     

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