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Specific Adsorption-Oxidation Strategy in Cathode Inner Helmholtz Plane Enabling 4.6 V Practical Lithium-Ion Full Cells.
Mao, Shulan; Mao, Jiale; Shen, Zeyu; Wu, Qian; Zhang, Shichao; Zhang, Jiahui; Lu, Yingying.
Afiliação
  • Mao S; State Key Laboratory of Chemical Engineering, Institute of Pharmaceutical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China.
  • Mao J; ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou 311215, China.
  • Shen Z; State Key Laboratory of Chemical Engineering, Institute of Pharmaceutical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China.
  • Wu Q; ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou 311215, China.
  • Zhang S; State Key Laboratory of Chemical Engineering, Institute of Pharmaceutical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China.
  • Zhang J; ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou 311215, China.
  • Lu Y; State Key Laboratory of Chemical Engineering, Institute of Pharmaceutical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China.
Nano Lett ; 23(15): 7014-7022, 2023 Aug 09.
Article em En | MEDLINE | ID: mdl-37523782
Increasing the cutoff voltage effectively maximizes the available capacity of the state-of-art layered-oxide cathodes (LiTMO2). However, the spontaneous dehydrogenation-oxidation of carbonates in the cathode inner Helmholtz plane (C-IHP) under high voltage/temperature leads to side effects, including weak cathode electrolyte interphase (CEI) and cathode structural collapse. Here, we report a specific adsorption-oxidation (Ad-O) mechanism that dominates the later CEI formation through molecular regulation in C-IHP. The two tailored additives with specific electron-rich groups will enter the C-IHP and mask the active sites of cathodes, thereby reducing the weak CEI generation from conventional carbonates. As-formed hierarchical CEI with inner LiF and outer B-F/-CN rich organic structure will further protect the aggressive cathode from harmful electrolyte corrosion under harsh conditions of high voltages (4.6 V) and elevated temperatures (60 °C). This synergistic strategy guided by the specific Ad-O mechanism enables 3.5 Ah LiNi0.8Co0.1Mn0.1O2/Graphite pouch cells, which remarkably achieve 270 Wh/kg with 450 cycles.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Nano Lett Ano de publicação: 2023 Tipo de documento: Article País de afiliação: China País de publicação: Estados Unidos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Nano Lett Ano de publicação: 2023 Tipo de documento: Article País de afiliação: China País de publicação: Estados Unidos