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Enhanced Li-Ion Diffusion and Cycling Stability of Ni-Free High-Entropy Spinel Oxide Anodes with High-Concentration Oxygen Vacancies.
Xiao, Bin; Wu, Gang; Wang, Tongde; Wei, Zhengang; Xie, Zelin; Sui, Yanwei; Qi, Jiqiu; Wei, Fuxiang; Zhang, Xiahui; Tang, Lin-Bo; Zheng, Jun-Chao.
Afiliação
  • Xiao B; School of Materials Science and Physics, China University of Mining and Technology, Xuzhou221116, P. R. China.
  • Wu G; School of Materials Science and Physics, China University of Mining and Technology, Xuzhou221116, P. R. China.
  • Wang T; School of Materials Science and Physics, China University of Mining and Technology, Xuzhou221116, P. R. China.
  • Wei Z; School of Materials Science and Physics, China University of Mining and Technology, Xuzhou221116, P. R. China.
  • Xie Z; School of Materials Science and Physics, China University of Mining and Technology, Xuzhou221116, P. R. China.
  • Sui Y; School of Materials Science and Physics, China University of Mining and Technology, Xuzhou221116, P. R. China.
  • Qi J; School of Materials Science and Physics, China University of Mining and Technology, Xuzhou221116, P. R. China.
  • Wei F; School of Materials Science and Physics, China University of Mining and Technology, Xuzhou221116, P. R. China.
  • Zhang X; School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington99164, United States.
  • Tang LB; School of Metallurgy and Environment, Central South University, Changsha410083, P. R. China.
  • Zheng JC; School of Metallurgy and Environment, Central South University, Changsha410083, P. R. China.
ACS Appl Mater Interfaces ; 15(2): 2792-2803, 2023 Jan 18.
Article em En | MEDLINE | ID: mdl-36606677
High-entropy oxide (HEO) is an emerging type of anode material for lithium-ion batteries with excellent properties, where high-concentration oxygen vacancies can effectively enhance the diffusion coefficient of lithium ions. In this study, Ni-free spinel-type HEOs ((FeCoCrMnZn)3O4 and (FeCoCrMnMg)3O4) were prepared via ball milling, and the effects of zinc and magnesium on the concentration of oxygen vacancy (OV), lithium-ion diffusion coefficient (DLi+), and electrochemical performance of HEOs were investigated. Ab initio calculations show that the addition of zinc narrows down the band gap and thus improves the electrical conductivity. X-ray photoelectron spectroscopy (XPS) results show that (FeCoCrMnZn)3O4 (42.7%) and (FeCoCrMnMg)3O4 (42.5%) have high OV concentration. During charge/discharge, the OV concentration of (FeCoCrMnZn)3O4 is higher than that of (FeCoCrMnMg)3O4. The galvanostatic intermittent titration technique (GITT) results show that the DLi+ value of (FeCoCrMnZn)3O4 is higher than that of (FeCoCrMnMg)3O4 during charge and discharge. All of that can improve its specific discharge capacity and enhance its cycle stability. (FeCoCrMnZn)3O4 achieved a discharge capacity of 828.6 mAh g-1 at 2.0 A g-1 after 2000 cycles. This work provides a deep understanding of the structure and performance of HEO.
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Texto completo: 1 Bases de dados: MEDLINE Idioma: En Revista: ACS Appl Mater Interfaces Assunto da revista: BIOTECNOLOGIA / ENGENHARIA BIOMEDICA Ano de publicação: 2023 Tipo de documento: Article

Texto completo: 1 Bases de dados: MEDLINE Idioma: En Revista: ACS Appl Mater Interfaces Assunto da revista: BIOTECNOLOGIA / ENGENHARIA BIOMEDICA Ano de publicação: 2023 Tipo de documento: Article