A novel Mn-based P2/tunnel/O3′ tri-phase composite cathode with enhanced sodium storage properties

Dong Wang; Yihua Liu; Zhenguo Wu; Xiaohong Liu; Jie Qu; Hao Liu; Yong Ming; Yanjun Zhong; Benhe Zhong; Xiaodong Guo

doi:10.1039/C9CC09316H

A novel Mn-based P2/tunnel/O3′ tri-phase composite cathode with enhanced sodium storage properties†

Dong Wang,^a Yihua Liu,^a Zhenguo Wu,

*^a Xiaohong Liu,^a Jie Qu,^a Hao Liu,^a Yong Ming,^a Yanjun Zhong,

^a Benhe Zhong^a and Xiaodong Guo

*^ab

Author affiliations

* Corresponding authors

^a College of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China
E-mail: zhenguowu@scu.edu.cn

^b Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia

Abstract

A novel P2/tunnel/O3′ composite Na_0.7Bi_0.01MnO₂ cathode is developed via the Na⁺-site modification of Bi³⁺ in layer structure Na_0.7MnO₂ for the first time. Superior electrochemical performance with a high capacity retention of ∼86.5% after 300 cycles at 2C is obtained. Moreover, the tri-phase structure can also serve as a model material, which intuitively evidences the environmental structural stability order: tunnel > P2 > O3′.

Chemical Communications

A novel Mn-based P2/tunnel/O3′ tri-phase composite cathode with enhanced sodium storage properties†

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A novel Mn-based P2/tunnel/O3′ tri-phase composite cathode with enhanced sodium storage properties

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