Volume 19, Issue 21 2300148
Research Article

High-Energy Aqueous Magnesium Ion Batteries with Capacity-Compensation Evolved from Dynamic Copper Ion Redox

Shuxin Zhang

Shuxin Zhang

School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China

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Yaowei Wang

Yaowei Wang

University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China

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Yukun Sun

Yukun Sun

School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China

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Yaru Wang

Yaru Wang

School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China

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Yang Yang

Yang Yang

School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China

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Peng Zhang

Peng Zhang

School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China

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Xuecheng Lv

Xuecheng Lv

School of Energy and Power Engineering, Dalian University of Technology, Dalian, 116024 P. R. China

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Jiulin Wang

Jiulin Wang

School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China

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Hong Zhu

Hong Zhu

University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China

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Yanna NuLi

Corresponding Author

Yanna NuLi

School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China

E-mail: [email protected]

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First published: 25 February 2023
Citations: 5

Abstract

The low specific capacity and low voltage plateau are significant challenges in the advancement of practical magnesium ion batteries (MIBs). Here, a superior aqueous electrolyte combining with a copper foam interlayer between anode and separator is proposed to address these drawbacks. Notably, with the dynamic redox of copper ions, the weakened solvation of Mg2+ cations in the electrolyte and the enhanced electronic conductivity of anode, which may offer effective capacity-compensation to the 3,4,9,10-perylenetetracarboxylic diimide (PTCDI)-Mg conversion reactions during the long-term cycles. As a result, the unique MIBs using expanded graphite cathode coupled with PTCDI anode demonstrate exceptional performance with an ultra-high capacity (205 mAh g−1, 243 Wh kg−1 at 5 A g−1) as well as excellent cycling stability after 600 cycles and rate capability (138 mAh g−1, 81 Wh kg−1 at 10 A g−1).

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

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