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Regulating Frozen Electrolyte Structure with Colloidal Dispersion for Low Temperature Aqueous Batteries
Qingshun Nian1, Tianjiang Sun2, Yecheng Li1
1School of Chemistry and Materials Science, University of Science and Technology of China, Anhui, 230026, China.
Angewandte Chemie (International Ed. in English)
|January 2, 2023
Summary
Researchers developed a novel colloidal electrolyte using graphene oxide quantum dots (GOQDs) to improve the low-temperature performance of aqueous batteries (ABs). This strategy inhibits ice crystal growth and enhances ion transport in frozen electrolytes.
Area of Science:
- Materials Science
- Electrochemistry
- Physical Chemistry
Background:
- Electrolyte freezing at low temperatures poses a significant challenge for the development and performance of aqueous batteries (ABs).
- Existing research primarily focuses on lowering the electrolyte freezing point, with less attention given to the structural evolution during freezing and its regulation.
- Understanding and controlling the frozen electrolyte structure is crucial for enabling low-temperature battery operation.
Purpose of the Study:
- To investigate the structural evolution of electrolytes during the freezing process using in situ variable-temperature technologies.
- To develop a strategy for regulating the frozen electrolyte structure to enhance ion transport at low temperatures.
- To improve the low-temperature performance of aqueous batteries through advanced electrolyte design.
Main Methods:
- Utilized in situ variable-temperature technologies to observe the formation of interconnected liquid regions in frozen electrolytes.
- Designed a colloidal electrolyte incorporating graphene oxide quantum dots (GOQDs).
- Evaluated the low-temperature performance of aqueous batteries with the developed GOQD-based colloidal electrolyte.
Main Results:
- Revealed the formation process of interconnected liquid regions essential for ion transport in frozen electrolytes.
- Demonstrated that graphene oxide quantum dots (GOQDs) effectively inhibit ice crystal growth.
- Observed significant improvement in the low-temperature performance of aqueous batteries due to expanded interconnected liquid regions for ion transport.
Conclusions:
- The study provides new insights into the structural evolution of frozen electrolytes.
- Colloidal electrolyte design using GOQDs offers a promising strategy for developing high-performance low-temperature aqueous batteries.
- This approach enhances ion transport pathways in frozen electrolytes, overcoming critical low-temperature limitations.
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