Boost VS_(2) electrochemical reactive kinetics by regulating crystallographic planes and coupling carbon matrix for high performance sodium-ion storage  

作　　者：Min Zeng Ming-Shan Wang Lin Chen En-Zhi Li Zhen-Liang Yang Dan Zhou Hai-Jiao Xie Jun-Chen Chen Zhi-Yuan Ma Bing-Shu Guo Bo Yu Xing Li 

机构地区：[1]School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China [2]Energy Storage Research Institute,Southwest Petroleum University,Chengdu 610500,China [3]Institute of Materials,China Academy of Engineering Physics,Mianyang 621908,China [4]Beijing Advanced Innovation Center for Materials Genome Engineering,University of Science and Technology,Beijing,Beijing 100083,China [5]Hangzhou Yanqu Information Technology Co.,Ltd.,Hangzhou 310003,China

出　　处：《Rare Metals》2024年第1期98-112,共15页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos.52072322 and 51604250);Sichuan Science and Technology Program (Nos.2022YFG0294 and 2019-GH02-00052-HZ)。

摘　　要：Vanadium disulfide(VS_(2)) as a typical two-dimensional transition metal chalcogenide has excellent competitiveness for sodium-ion storage due to its wide layer spacing(0.575 nm),high theoretical capacity of 932mAh·g^(-1) originating from multi-electron electrochemical redox.However,continuous sodiation process accompanied by crystal structural evolution and collapse cause rapid capacity decaying.Herein,novel few-layer VS_(2)nanosheets with open(001) crystal planes are in-situ constructed on reduced graphene oxide to solve these issues mentioned above.It indicates that few-layer VS_(2)provides more Na^(+) storage activity due to the low Na^(+)surface migration energy barrier on exposed crystal(001)planes.The flexible and high electronic conductivity of carbon matrix also effectively builds multi-level buffer structure and electron transport kinetics to boost the Na^(+)insertion/conversion reactive activity on VS_(2) as well as Na^(+) pseudocapacitance storage kinetics on edges and defects of nano sheets.Those coupling effects result in high rate capability and long cycling stability as a battery/capacitor anode.It delivers conspicuous high energy density of 81 and 40 Wh·kg^(-1) at power density of 118 and 10,286W·kg^(-1),as well as 80% energy retention rate after 5000cycles,confirming its great application potential in sodiumbased storage devices.

关 键 词：Vanadium disulfide Reduced graphene oxide Anode Sodium-ion battery Sodium-ion capacitor 

分 类 号：TM912[电气工程—电力电子与电力传动] TM53[理学—物理化学] O643.1[理学—化学]