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High-entropy Electrolyte Enables High Reversibility and Long Lifespan for Magnesium Metal Anodes.
Wang, Shiyang; Wang, Kewei; Zhang, Yuchen; Jie, Yulin; Li, Xinpeng; Pan, Yuxue; Gao, Xiaowen; Nian, Qingshun; Cao, Ruiguo; Li, Qi; Jiao, Shuhong; Xu, Dongsheng.
Afiliação
  • Wang S; College of Chemistry and Molecular Engineering, Peking University, 100871, Beijing, China.
  • Wang K; College of Chemistry and Molecular Engineering, Peking University, 100871, Beijing, China.
  • Zhang Y; Hefei National Laboratory for Physical Science at the Microscale, Department of Materials Science and Engineering, University of Science and Technology of China, 230026, Hefei, Anhui, China.
  • Jie Y; Hefei National Laboratory for Physical Science at the Microscale, Department of Materials Science and Engineering, University of Science and Technology of China, 230026, Hefei, Anhui, China.
  • Li X; Hefei National Laboratory for Physical Science at the Microscale, Department of Materials Science and Engineering, University of Science and Technology of China, 230026, Hefei, Anhui, China.
  • Pan Y; Hefei National Laboratory for Physical Science at the Microscale, Department of Materials Science and Engineering, University of Science and Technology of China, 230026, Hefei, Anhui, China.
  • Gao X; College of Chemistry and Molecular Engineering, Peking University, 100871, Beijing, China.
  • Nian Q; Hefei National Laboratory for Physical Science at the Microscale, Department of Materials Science and Engineering, University of Science and Technology of China, 230026, Hefei, Anhui, China.
  • Cao R; Hefei National Laboratory for Physical Science at the Microscale, Department of Materials Science and Engineering, University of Science and Technology of China, 230026, Hefei, Anhui, China.
  • Li Q; College of Chemistry and Molecular Engineering, Peking University, 100871, Beijing, China.
  • Jiao S; Hefei National Laboratory for Physical Science at the Microscale, Department of Materials Science and Engineering, University of Science and Technology of China, 230026, Hefei, Anhui, China.
  • Xu D; College of Chemistry and Molecular Engineering, Peking University, 100871, Beijing, China.
Angew Chem Int Ed Engl ; 62(31): e202304411, 2023 Aug 01.
Article em En | MEDLINE | ID: mdl-37269185
ABSTRACT
The stable cycling of Mg-metal anodes is limited by several problems, including sluggish electrochemical kinetics and passivation at the Mg surface. In this study, we present a high-entropy electrolyte composed of lithium triflate (LiOTf) and trimethyl phosphate (TMP) co-added to magnesium bis(trifluoromethane sulfonyl)imide (Mg(TFSI)2 /1,2-dimethoxyethane (DME) to significantly improve the electrochemical performance of Mg-metal anodes. The as-formed high-entropy Mg2+ -2DME-OTf- -Li+ -DME-TMP solvation structure effectively reduced the Mg2+ -DME interaction in comparison with that observed in traditional Mg(TFSI)2 /DME electrolytes, thereby preventing the formation of insulating components on the Mg-metal anode and promoting its electrochemical kinetics and cycling stability. Comprehensive characterization revealed that the high-entropy solvation structure brought OTf- and TMP to the surface of the Mg-metal anode and promoted the formation of a Mg3 (PO4 )2 -rich interfacial layer, which is beneficial for enhancing Mg2+ conductivity. Consequently, the Mg-metal anode achieved excellent reversibility with a high Coulombic efficiency of 98 % and low voltage hysteresis. This study provides new insights into the design of electrolytes for Mg-metal batteries.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2023 Tipo de documento: Article
Texto completo
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2023 Tipo de documento: Article