Constructing highly safe and long-life calcium ion batteries based on hydratedvanadium oxide cathodes featuring a pillar structure  

作　　者：Chun-Fang Wang Shi-Wei Zhang Lan Huang Yuan-Min Zhu Feng Liu Jian-Chuan Wang Li-Ming Tan Chun-Yi Zhi Cui-Ping Han 

机构地区：[1]Powder Metallurgy Research Institute,Central South University,Changsha410083,China [2]Songshan Lake Materials Laboratory,Dongguan 523808,China [3]Research Institute of Interdisciplinary Science and School of Materials Science and Engineering,Dongguan University of Technology,Dongguan 523808,China [4]Department of Materials Science and Engineering,City University of Hong Kong,Hong Kong 999077,China [5]Faculty of Materials Science and Energy Engineering/Institute of Technology for Carbon Neutrality,Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,China

出　　处：《Rare Metals》2024年第6期2597-2612,共16页稀有金属（英文版）

基　　金：financially supported by the Open Research Found of Songshan Lake Materials Laboratory(No.2021SLABFN04);National Natural Science Foundation of China(Nos.22109134 and 52171025);Guangdong Basic and Applied Basic Research Foundation(No.2022A1515010920);the Outstanding Youth Basic Research Project of Shenzhen(No.RCYX20221008092934093)。

摘　　要：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 reversiblc Ca^(2+)intercalation/deintercalation.Herein,layered H_(2)V_(3)O_(8)(HVO)with Zn^(2+)pre-insertion(ZHVO)is reported as a high-rate and highly durable cathode material for CIBs.The existence of Zn^(2+)and H_(2)O pillars could expand the interlayer spacing up to 1.8 nm,which is favorable for the diffusion of bulky Ca^(2+).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 Zn^(2+)moved during Ca^(2+)intercalation,thereby reducing the diffusion energy barrier and facilitating Ca^(2+)diffusion.Finally,a safe aqueous calcium ion cell was successfully assembled.

关 键 词：Multivalent batteries Calcium-ion batteries Layered structure Vanadium oxide Cathode materials 

分 类 号：TM912[电气工程—电力电子与电力传动]