articleAdvanced Energy MaterialsFeb 21, 2022Closed access

Mitigating the Large‐Volume Phase Transition of P2‐Type Cathodes by Synergetic Effect of Multiple Ions for Improved Sodium‐Ion Batteries

ZCZhiwei ChengBZBin ZhaoYGYu‐Jie GuoYGYu‐Jie GuoLYLianzheng Yu

Xi'an Jiaotong University · Chinese Academy of Sciences · +3 more institutions

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Abstract

Abstract Layered transition metal oxide P2‐Na 2/3 Ni 1/3 Mn 2/3 O 2 usually suffers from large‐volume phase transitions and different Na‐vacancy ordering during sodium (de)intercalation, incurring rapid capacity decline and poor rate capability. Herein, an effective strategy based on synergetic effect of selected multiple metal ions is designed for P2‐type cathodes with improved performance. The role of tetravalent titanium provides high redox potential, inactive divalent magnesium stabilizes the structure, and the monovalent lithium smooths the electrochemical curves. The combined analysis of in operando X‐ray diffraction, in operando X‐ray absorption spectroscopy and density functional theory calculations…

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274
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Authors

14

Topics & keywords

Keywords
  • Materials science
  • Cathode
  • Intercalation (chemistry)
  • Electrochemistry
  • Anode
  • Transition metal
  • Chemical engineering
  • Lithium (medication)
UN Sustainable Development Goals
  • Affordable and clean energy
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