Li Jin, Han Chengjun, Ou Xuewu, Tang Yongbing
Advanced Energy Storage Technology Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China.
Nano Science and Technology Institute, University of Science and Technology of China, Suzhou, 215123, China.
Angew Chem Int Ed Engl. 2022 Mar 28;61(14):e202116668. doi: 10.1002/anie.202116668. Epub 2022 Feb 11.
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) ) 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 Ca 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 mAh g specific discharge capacity at 100 mA g and 84.7 % capacity retention over 350 cycles, among the best results known for CIBs.
由于钙（Ca）的丰度高、氧化还原电位低和多价特性，钙离子电池（CIBs）在储能应用中展现出广阔前景。然而，目前关于CIBs的研究面临循环稳定性和容量不尽人意的挑战，主要受限于缺乏合适的电解质和电极材料。在此，我们首先开发了一种3.5 m的浓电解质，其中双（氟磺酰）亚胺钙（Ca(FSI)₂）盐溶解于碳酸盐溶剂中。这种电解质显著提高了石墨阴极中阴离子的嵌入容量，并有助于Ca在有机阳极中的可逆嵌入。通过将这种浓电解质与低成本且环保的石墨阴极和有机阳极相结合，组装的钙基双离子电池（Ca-DIB）在100 mA g⁻¹电流密度下展现出75.4 mAh g⁻¹的比放电容量，在350次循环中容量保持率为84.7%，是CIBs领域已知的最佳结果之一。
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