Abstract
Calcium-ion batteries(CIBs)have generated intense interest due to the growing demand for safer,cheaper,and large-scale energy storage systems.However,their development is still in its infancy,owing to the lack of suitable cathodes for sustaining reversible Ca2+intercala-tion/deintercalation.Herein,layered H2V3O8(HVO)with Zn2+pre-insertion(ZHVO)is reported as a high-rate and highly durable cathode material for CIBs.The existence of Zn2+and H2O pillars could expand the interlayer spacing up to 1.8 nm,which is favorable for the diffusion of bulky Ca2+.The formation of Zn-O bonds facilitates electron transfer and enhances electrical conduction.Consequently,the ZHVO cathode achieves superior capacity performance(213.9 mAh·g-1 at 0.2 A·g-1)and long lifespan(78.3％for 1,000 cycles at 5 A·g-1)compared to pristine HVO.Density functional theory(DFT)calculations revealed that Zn2+moved during Ca2+intercalation,thereby reducing the diffusion energy barrier and facilitating Ca2+diffusion.Finally,a safe aqueous calcium ion cell was successfully assembled.
基金项目
Open Research Found of Songshan Lake Materials Laboratory(2021SLABFN04)
国家自然科学基金(22109134)
国家自然科学基金(52171025)
Guangdong Basic and Applied Basic Research Foundation(2022A1515010920)
Outstanding Youth Basic Research Project of Shenzhen(RCYX20221008092934093)
NETL
NSTL
万方数据