Affiliation:
1. School of Chemistry and Materials Science University of Science and Technology of China Anhui 230026 China
2. Laboratory of Advanced Energy Chemistry (Ministry of Education) Nankai University Tianjin 300071 China
Abstract
AbstractElectrolyte freezing under low temperatures is a critical challenge for the development of aqueous batteries (ABs). While lowering the freezing point of the electrolyte has caught major research efforts, limited attention has been paid to the structural evolution during the electrolyte freezing process and regulating the frozen electrolyte structure for low temperature ABs. Here, we reveal the formation process of interconnected liquid regions for ion transport in frozen electrolytes with various in situ variable‐temperature technologies. More importantly, the low‐temperature performance of ABs was significantly improved with the colloidal electrolyte design using graphene oxide quantum dots (GOQDs), which effectively inhibits the growth of ice crystals and expands the interconnected liquid regions for facial ion transport. This work provides new insights and a promising strategy for the electrolyte design of low‐temperature ABs.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Key Technologies Research and Development Program
Ministry of Education of the People's Republic of China