Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 14, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202116668
Keywords
Calcium-Ion Battery; Capacity Retention; Concentrated Electrolyte; Graphite Cathode; Organic Anode
Categories
Funding
- National Natural Science Foundation of China [52061160484, 51822210, 51972329, 22109170, 52125105]
- Shenzhen Science and Technology Planning Project [JCYJ20200109115624923]
- Guangdong Natural Science Foundation [2021A1515012365, 2019TX05L389]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515110445]
- SIAT Innovation Program for Excellent Young Researchers [E1G042]
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Calcium-ion batteries (CIBs) have great potential for energy storage applications due to the abundance, low redox potential, and multivalent properties of calcium (Ca). However, the lack of suitable electrolytes and electrode materials has restricted the cycling stability and capacity of CIBs. In this study, a concentrated electrolyte with a calcium bis(fluorosulfonyl)imide (Ca(FSI)(2)) salt dissolved in carbonate solvents was developed, which significantly improved the intercalation capacity for anions in the graphite cathode and the reversible insertion of Ca2+ in the organic anode. By combining this electrolyte with low-cost graphite cathode and organic anode, a Ca-based dual-ion battery (Ca-DIB) with high specific discharge capacity and good capacity retention was achieved.
Due to the large abundance, low redox potential, and multivalent properties of calcium (Ca), Ca-ion batteries (CIBs) show promising prospects for energy storage applications. However, current research on CIBs faces the challenges of unsatisfactory cycling stability and capacity, mainly restricted by the lack of suitable electrolytes and electrode materials. Herein, we firstly developed a 3.5 m concentrated electrolyte with a calcium bis(fluorosulfonyl)imide (Ca(FSI)(2)) salt dissolved in carbonate solvents. This electrolyte significantly improved the intercalation capacity for anions in the graphite cathode and contributed to the reversible insertion of Ca2+ in the organic anode. By combining this concentrated electrolyte with the low-cost and environmentally friendly graphite cathode and organic anode, the assembled Ca-based dual-ion battery (Ca-DIB) exhibits 75.4 mAhg(-1) specific discharge capacity at 100 mAg(-1) and 84.7 % capacity retention over 350 cycles, among the best results known for CIBs.
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