溶剂化
电解质
阴极
材料科学
电化学
溶剂化壳
离子
钒
锂(药物)
化学工程
化学物理
溶剂
电极
无机化学
物理化学
化学
有机化学
医学
工程类
冶金
内分泌学
作者
Fanbin Zeng,Senlin Li,Sanlue Hu,Minling Qiu,Guobin Zhang,Meilin Li,Caiyun Chang,Hongliang Wang,Minwei Xu,Lirong Zheng,Yongbing Tang,Cuiping Han,Hui‐Ming Cheng
标识
DOI:10.1002/adfm.202302397
摘要
Abstract Calcium ion batteries (CIBs) are considered as an important candidate for post‐lithium energy storage devices due to their abundance of resources and low cost. However, CIBs still suffer from slow kinetics due to the large solvation structure and high desolvation energy of Ca 2+ ions. Here, a solvation regulation strategy based on donor number (DN) is reported to achieve easy‐desolvation and rapid storage of Ca 2+ in sodium vanadate (Na 2 V 6 O 16 ·2H 2 O, NVO). Specially, the solvent with a low DN, represented by propylene carbonate (PC), forms the first solvation shell of calcium ions with weak binding energy and small shell structure, which facilitates the migration of Ca 2+ in the electrolyte. More importantly, the low DN solvent is preferentially desolvated at the cathode/electrolyte interface, promoting the insertion of Ca 2+ into the NVO electrode. Mechanism studies further confirm the highly reversible uptake/release of Ca 2+ in the NVO cathode, along with the VO distance change in the coordination structure. Therefore, the NVO cathode achieves high capacity (376 mAh g −1 at 0.3 A g −1 ) and high‐rate performance (151 mAh g −1 at 5 A g −1 ). The weak solvation effect strategy further improves the electrochemical performance and provides great importance for the design of the long‐term development of CIBs.
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