Gradient‐Structured and Robust Solid Electrolyte Interphase In Situ Formed by Hydrated Eutectic Electrolytes for High‐Performance Zinc Metal Batteries

Author:

Wang Guanyao12ORCID,Fu Hao1,Lu Jun1,Huang Shengyang1,Pei Chengang1,Min Donghyun1,Zhang Qiang3ORCID,Park Ho Seok1456ORCID

Affiliation:

1. School of Chemical Engineering Sungkyunkwan University 2066, Seoburo, Jangan‐gu Suwon 440‐746 Republic of Korea

2. School of Environmental and Chemical Engineering Shanghai University Shanghai 200444 China

3. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical Engineering Tsinghua University Beijing 100084 China

4. Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology (SAIHST) Sungkyunkwan University 2066, Seoburo, Jangan‐gu Suwon 440‐746 Republic of Korea

5. SKKU Advanced Institute of Nano Technology (SAINT) Sungkyunkwan University 2066, Seoburo, Jangan‐gu Suwon 440‐746 Republic of Korea

6. SKKU Institute of Energy Science and Technology (SIEST) Sungkyunkwan University 2066, Seoburo, Jangan‐gu Suwon 440‐746 Republic of Korea

Abstract

AbstractThe mechanically and electrochemically stable and ionically conducting solid electrolyte interphase (SEI) is important for the stabilization of metal anodes. Since SEIs are originally absent in aqueous zinc metal batteries (AZMBs), it is very challenging to suppress water‐induced side reactions and dendrite growth of Zn metal anodes (ZMAs). Herein, a gradient‐structured and robust solid gradient SEI, consisting of B,O‐inner and F,O‐exterior layer, in situ formed by hydrated eutectic electrolyte for the homogeneous and reversible Zn deposition, is demonstrated. Moreover, the molar ratio of acetamide to Zn salt is modulated to prohibit the water activity and the hydrolysis of BF4 as well as to achieve high ionic conductivity owing to the regulation of the solvation sheath of Zn2+. Consequently, the eutectic electrolyte allows Zn||Zn symmetric cells to achieve a cycling lifespan of over 4400 h at 0.5 mA cm−2 as well as Zn||PANI full cells to deliver a high capacity retention of 73.2% over 4000 cycles at 1 A g−1 and to demonstrate the stable operation at low temperatures. This work provides the rational design for the hydrated eutectic electrolyte and the corresponding gradient SEIs for dendrite‐free and stable Zn anodes even under harsh conditions.

Publisher

Wiley

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