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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
Halogen Electrochemistry Enabled Complementary Lithium/Halogen Dual-Ion Batteries with Enhanced Capacity and
Kaiqiang Zhang1,2, Qianchuan Yu1, Jingjie Sun1
1State Key Laboratory of Coordination Chemistry, MOE Key Laboratory of Mesoscopic Chemistry, MOE Key Laboratory of High Performance Polymer Materials and Technology, Jiangsu Key Laboratory of Clean Energy Catalysis and Intelligent Green Chemical Engineering, Suzhou Key Laboratory of Green Intelligent Manufacturing of New Energy Materials and Devices, Tianchang New Materials and Energy Technologies Research Center, Institute of Green Chemistry and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu 210023, P. R. China.
Researchers developed a new halogen electrochemistry strategy for rechargeable dual-ion batteries. This method uses small halogen ions, like bromide, to improve battery performance, offering a promising alternative to traditional lithium-ion batteries.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Rechargeable dual-ion batteries offer potential for fast charging and grid storage.
- Current limitations include sluggish kinetics, low capacity, and poor durability due to bulky anions.
Purpose of the Study:
- To introduce a novel halogen electrochemistry strategy for enhanced dual-ion battery performance.
- To utilize small halogen ions as charge carriers for efficient anion redox reactions.
Main Methods:
- Employed small halogen ions, specifically bromide ions, as charge carriers.
- Investigated graphite, Co-BDC, and ZIF-67 as cathode materials.
- Conducted electrochemical and spectroscopic analyses to understand charge storage mechanisms.
Main Results:
- Bromide ions demonstrated superior electrochemical performance.
- Achieved specific capacities of 197, 226, and 291 mAh g⁻¹ with graphite, Co-BDC, and ZIF-67 cathodes, respectively.
- Confirmed enhanced ion storage and redox kinetics by replacing large anions with small halogen ions.
Conclusions:
- Halogen electrochemistry provides a new approach for high-performance dual-ion batteries.
- Small halogen ions overcome limitations associated with bulky anions.
- This strategy enables scalable and efficient energy storage solutions.
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