H2O‐Mg2+ Waltz‐Like Shuttle Enables High‐Capacity and Ultralong‐Life Magnesium‐Ion Batteries

Author:

Ma Xiu‐Fen1,Zhao Bai‐Qing2,Liu Hongyu1,Tan Jing1,Li Hong‐Yi13ORCID,Zhang Xie4,Diao Jiang13,Yue Jili13,Huang Guangsheng13,Wang Jingfeng13,Pan Fusheng135

Affiliation:

1. National Innovation Center for Industry‐Education Integration of Energy Storage Technology College of Materials Science and Engineering Chongqing University Chongqing 400044 China

2. Materials and Energy Division Beijing Computational Science Research Center Beijing 100193 China

3. National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing 400044 China

4. School of Materials Science and Engineering Northwestern Polytechnical University Xi'an 710072 China

5. National Key Laboratory of Advanced Casting Technologies Chongqing University Chongqing 400044 China

Abstract

AbstractMg‐ion batteries (MIBs) are promising next‐generation secondary batteries, but suffer from sluggish Mg2+ migration kinetics and structural collapse of the cathode materials. Here, an H2O‐Mg2+ waltz‐like shuttle mechanism in the lamellar cathode, which is realized by the coordination, adaptive rotation and flipping, and co‐migration of lattice H2O molecules with inserted Mg2+, leading to the fast Mg2+ migration kinetics, is reported; after Mg2+ extraction, the lattice H2O molecules rearrange to stabilize the lamellar structure, eliminating structural collapse of the cathode. Consequently, the demo cathode of Mg0.75V10O24·nH2O (MVOH) exhibits a high capacity of 350 mAh g−1 at a current density of 50 mA g−1 and maintains a capacity of 70 mAh g−1 at 4 A g−1. The full aqueous MIB based on MVOH delivers an ultralong lifespan of 5000 cycles The reported waltz‐like shuttle mechanism of lattice H2O provides a novel strategy to develop high‐performance cathodes for MIBs as well as other multivalent‐ion batteries.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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