Air-Stable Copper-Based P2-Na7/9Cu2/9Fe1/9Mn2/3O2 as a New Positive Electrode Material for Sodium-Ion Batteries

Yunming Li; Zhenzhong Yang; Shuyin Xu; Linqin Mu; Lin Gu; Yong-Sheng Hu; Hong Li; Liquan Chen

doi:10.1002/advs.201500031

Air-Stable Copper-Based P2-Na_7/9Cu_2/9Fe_1/9Mn_2/3O₂ as a New Positive Electrode Material for Sodium-Ion Batteries

Adv Sci (Weinh). 2015 May 4;2(6):1500031. doi: 10.1002/advs.201500031. eCollection 2015 Jun.

Authors

Yunming Li¹, Zhenzhong Yang², Shuyin Xu¹, Linqin Mu¹, Lin Gu², Yong-Sheng Hu¹, Hong Li¹, Liquan Chen¹

Affiliations

¹ Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and Devices Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China.
² Laboratory for Advanced Materials and Electron Microscopy Institute of Physics Chinese Academy of Sciences Beijing 100190 China.

Abstract

An air-stable copper-based P2-Na_7/9Cu_2/9Fe_1/9Mn_2/3O₂ is designed and synthesized by a simple solid-state method and investigated as a positive electrode material for sodium-ion batteries. The attractive long cycling stability is demonstrated by the capacity retention of 85% after 150 cycles at 1 C rate without phase transformation. The reversible Cu²⁺/Cu³⁺ redox couple in P2 phase oxides is proved for the first time.

Keywords: Na7/9Cu2/9Fe1/9Mn2/3O2; copper redox couple; grid storage; layered oxides; sodium‐ion batteries.