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Constructing a Composite Structure by a Gradient Mg2+ Doping Strategy for High-Performance Sodium-Ion Batteries.
Luo, Xin; Huang, Qun; Feng, Yiming; Zhang, Chunxiao; Liang, Chaoping; Zhou, Liangjun; Wei, Weifeng.
Afiliación
  • Luo X; State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, People's Republic of China.
  • Huang Q; State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, People's Republic of China.
  • Feng Y; State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, People's Republic of China.
  • Zhang C; State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, People's Republic of China.
  • Liang C; State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, People's Republic of China.
  • Zhou L; State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, People's Republic of China.
  • Wei W; State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, People's Republic of China.
ACS Appl Mater Interfaces ; 14(46): 51846-51854, 2022 Nov 23.
Article en En | MEDLINE | ID: mdl-36346960
Layered P2-Na0.67Mn0.67Ni0.33O2 has been considered an attractive cathode material for sodium-ion batteries (SIBs). Nevertheless, it is still burdened with hazardous phase transformation of P2-O2 under high voltage and harmful reactions at the interface of the electrode and electrolyte. These result in unfavorable structural degradation and rapid capacity decay. Herein, a gradient Mg2+ doping approach is proposed to trigger a structural transformation. During the annealing process, the bulk-diffused Mg2+ and surface residual Mg2+ induce the formation of the P2/P3@MgO structure. Consequently, this method combines the merits of the composite phases, bulk doping, and surface modification. In consequence, Na+ diffusion kinetics and electrochemical performances are remarkably enhanced. The cells using P2/P3@MgO show 69.7% capacity retention at 0.2 C within a voltage range of 1.5-4.5 V for 100 cycles, compared with the 42.6% for P2-Na0.67Mn0.67Ni0.33O2. This work offers new insights into further developments of advanced layered oxide cathodes for SIBs.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: ACS Appl Mater Interfaces Asunto de la revista: BIOTECNOLOGIA / ENGENHARIA BIOMEDICA Año: 2022 Tipo del documento: Article Pais de publicación: Estados Unidos
Texto completo
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Imprimir
XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: ACS Appl Mater Interfaces Asunto de la revista: BIOTECNOLOGIA / ENGENHARIA BIOMEDICA Año: 2022 Tipo del documento: Article Pais de publicación: Estados Unidos