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Electrolyte Chemistry Enables Simultaneous Stabilization of Potassium Metal and Alloying Anode for Potassium-Ion Batteries.
Wang, Hua; Yu, Dandan; Wang, Xiao; Niu, Zhiqiang; Chen, Mengxue; Cheng, Liwei; Zhou, Wei; Guo, Lin.
Afiliação
  • Wang H; School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, 100191, China.
  • Yu D; School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, 100191, China.
  • Wang X; Department of Chemistry, Virginia Tech, Blacksburg, VA, 24061, USA.
  • Niu Z; Key Laboratory of Advanced Energy Materials Chemistry of Ministry of Education, School of Chemistry, Nankai University, Tianjin, 300071, China.
  • Chen M; School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, 100191, China.
  • Cheng L; School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, 100191, China.
  • Zhou W; School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, 100191, China.
  • Guo L; School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, 100191, China.
Angew Chem Int Ed Engl ; 58(46): 16451-16455, 2019 Nov 11.
Artigo em Inglês | MEDLINE | ID: mdl-31482655
ABSTRACT
Alloying anodes are promising high-capacity electrode materials for K-ion batteries (KIBs). However, KIBs based on alloying anodes suffer from rapid capacity decay due to the instability of K metal and large volume expansion of alloying anodes. Herein, the effects of salts and solvents on the cycling stability of KIBs based on a typical alloying anode such as amorphous red phosphorus (RP) are investigated, and the potassium bis(fluorosulfonyl)imide (KFSI) salt-based carbonate electrolyte is versatile to achieve simultaneous stabilization of K metal and RP electrodes for highly stable KIBs. This salt-solvent complex with a moderate solvation energy can alleviate side reactions between K metal and the electrolyte and facilitate K+ ion diffusion/desolvation. Moreover, robust SEI layers that form on K metal and RP electrodes can suppress K dendrite growth and resist RP volume change. This strategy of electrolyte regulation can be applicable to other alloying anodes for high-performance KIBs.

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: Angew Chem Int Ed Engl Ano de publicação: 2019 Tipo de documento: Artigo País de afiliação: China