Jie Yulin, Tan Yunshu, Li Linmei, Han Yehu, Xu Shutao, Zhao Zhenchao, Cao Ruiguo, Ren Xiaodi, Huang Fanyang, Lei Zhanwu, Tao Guohua, Zhang Genqiang, Jiao Shuhong
Hefei National Laboratory for Physical Science at the Microscale, CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei, 230026, P. R. China.
School of Advanced Materials, Shenzhen Key Laboratory of New Energy Materials by Design, Peking University Shenzhen Graduate School, Shenzhen, 518055, P. R. China.
Angew Chem Int Ed Engl. 2020 Jul 27;59(31):12689-12693. doi: 10.1002/anie.202002274. Epub 2020 May 25.
Calcium-metal batteries (CMBs) provide a promising option for high-energy and cost-effective energy-storage technology beyond the current state-of-the-art lithium-ion batteries. Nevertheless, the development of room-temperature CMBs is significantly impeded by the poor reversibility and short lifespan of the calcium-metal anode. A solvation manipulation strategy is reported to improve the plating/stripping reversibility of calcium-metal anodes by enhancing the desolvation kinetics of calcium ions in the electrolyte. The introduction of lithium salt changes the electrolyte structure considerably by reducing coordination number of calcium ions in the first solvation shell. As a result, an unprecedented Coulombic efficiency of up to 99.1 % is achieved for galvanostatic plating/stripping of the calcium-metal anode, accompanied by a very stable long-term cycling performance over 200 cycles at room temperature. This work may open up new opportunities for development of practical CMBs.
钙金属电池（CMB）为超越当前最先进的锂离子电池的高能且经济高效的储能技术提供了一个有前景的选择。然而，室温CMB的发展受到钙金属阳极可逆性差和寿命短的显著阻碍。据报道，一种溶剂化调控策略通过增强电解质中钙离子的去溶剂化动力学来提高钙金属阳极的电镀/脱镀可逆性。锂盐的引入通过减少第一溶剂化层中钙离子的配位数，极大地改变了电解质结构。结果，钙金属阳极恒电流电镀/脱镀实现了高达99.1%的前所未有的库仑效率，同时在室温下200次循环中具有非常稳定的长期循环性能。这项工作可能为实用CMB的发展开辟新的机遇。
