High‐Energy Aqueous/Organic Hybrid Batteries Enabled by Cu2+ Redox Charge Carriers

Author:

Bi Songshan1,Zhang Yanyu1,Wang Huimin1,Tian Jinlei1,Niu Zhiqiang1ORCID

Affiliation:

1. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Renewable Energy Conversion and Storage Center Haihe Laboratory of Sustainable Chemical Transformations College of Chemistry Nankai University Tianjin 300071 P. R. China

Abstract

AbstractLithium||sulfur (Li||S) batteries are considered as one of the promising next‐generation batteries due to the high theoretical capacity and low cost of S cathodes, as well as the low redox potential of Li metal anodes (−3.04 V vs. standard hydrogen electrode). However, the S reduction reaction from S to Li2S leads to limited discharge voltage and capacity, largely hindering the energy density of Li||S batteries. Herein, high‐energy Li||S hybrid batteries were designed via an electrolyte decoupling strategy. In cathodes, S electrodes undergo the solid‐solid conversion reaction from S to Cu2S with four‐electron transfer in a Cu2+‐based aqueous electrolyte. Such an energy storage mechanism contributes to enhanced electrochemical performance of S electrodes, including high discharge potential and capacity, superior rate performance and stable cycling behavior. As a result, the assembled Li||S hybrid batteries exhibit a high discharge voltage of 3.4 V and satisfactory capacity of 2.3 Ah g−1, contributing to incredible energy density. This work provides an opportunity for the construction of high‐energy Li||S batteries.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

General Chemistry,Catalysis

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