An aqueous electrolyte densified by perovskite SrTiO3 enabling high-voltage zinc-ion batteries

Rongyu Deng, Zhenjiang He, Fulu Chu, Jie Lei, Yi Cheng, You Zhou and Feixiang Wu ()
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Rongyu Deng: Central South University
Zhenjiang He: Central South University
Fulu Chu: Central South University
Jie Lei: Central South University
Yi Cheng: Central South University
You Zhou: Central South University
Feixiang Wu: Central South University

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract The conventional weak acidic electrolyte for aqueous zinc-ion batteries breeds many challenges, such as undesirable side reactions, and inhomogeneous zinc dendrite growth, leading to low Coulombic efficiency, low specific capacity, and poor cycle stability. Here, an aqueous densified electrolyte, namely, a conventional aqueous electrolyte with addition of perovskite SrTiO3 powder, is developed to achieve high-performance aqueous zinc-ion batteries. The densified electrolyte demonstrates unique properties of reducing water molecule activity, improving Zn2+ transference number, and inducing homogeneous and preferential deposition of Zn (002). As a result, the densified electrolyte exhibits an ultra-long cycle stability over 1000 cycles in Zn/Ti half cells. In addition, the densified electrolyte enables Zn/MnO2 cells with a high specific capacity of 328.2 mAh g−1 at 1 A g−1 after 500 cycles under an extended voltage range. This work provides a simple strategy to induce dendrite-free deposition characteristics and high performance in high-voltage aqueous zinc-ion batteries.

Date: 2023
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DOI: 10.1038/s41467-023-40462-z

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