Confined Element Distribution with Structure‐Driven Energy Coupling for Enhanced Prussian Blue Analogue Cathode

Author:

Hu Xinyu1,Jian Weishun1,Hong Ningyun1,Zhong Xue1,Yang Mushi1,Tao Shusheng1,Huang Jiangnan1,Wang Haoji1,Gao Jingqiang1,Deng Wentao1,Zou Guoqiang1,Hou Hongshuai1,Silvester Debbie S.2,Banks Craig E.3,Ji Xiaobo1ORCID

Affiliation:

1. State Key Laboratory of Powder Metallurgy, College of Chemistry and Chemical Engineering Central South University Changsha 410083 China

2. School of Molecular and Life Sciences Curtin University, GPO Box U1987 Perth, Western Australia 6845 Australia

3. Faculty of Science and Engineering Manchester Metropolitan University Manchester M1 5GD UK

Abstract

AbstractThe structural failure of Na2Mn[Fe(CN)6] could not be alleviated with traditional modification strategies through the adjustable composition property of Prussian blue analogues (PBAs), considering that the accumulation and release of stress derived from the MnN6 octahedrons are unilaterally restrained. Herein, a novel application of adjustable composition property, through constructing a coordination competition relationship between chelators and [Fe(CN)6]4− to directionally tune the enrichment of elements, is proposed to restrain structural degradation and induce unconventional energy coupling phenomenon. The non‐uniform distribution of elements at the M1 site of PBAs (NFM‐PB) is manipulated by the sequentially precipitated Ni, Fe, and Mn according to the Irving‐William order. Electrochemically active Fe is operated to accompany Mn, and zero‐strain Ni is modulated to enrich at the surface, synergistically mitigating with the enrichment and release of stress and then significantly improving the structural stability. Furthermore, unconventional energy coupling effect, a fusion of the electrochemical behavior between FeLS and MnHS, is triggered by the confined element distribution, leading to the enhanced electrochemical stability and anti‐polarization ability. Consequently, the NFM‐PB demonstrates superior rate performance and cycling stability. These findings further exploit potentialities of the adjustable composition property and provide new insights into the component design engineering for advanced PBAs.

Funder

National Natural Science Foundation of China

Fundamental Research Funds for Central Universities of the Central South University

Publisher

Wiley

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