Molecular template derived ultrathin N-doped carbon layer on cobalt selenide nanobelts for durable and rapid sodium storage  

作　　者：Chuanliang Wei Baojuan Xi Kangdong Tian Xinlu Zhang Quanyan Man Keyan Bao Wutao Mao Jinkui Feng Shenglin Xiong 

机构地区：[1]Key Laboratory of the Colloid and Interface Chemistry,Ministry of Education,School of Chemistry and Chemical Engineering,School of Materials Science and Engineering,Shandong University,Jinan 250100,China [2]Resource Environment and Clean Energy Laboratory,School of Chemical and Environmental Engineering,Jiangsu University of Technology,Changzhou 213001,China

出　　处：《Nano Research》2024年第9期8145-8154,共10页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.U21A2077 and 51972198);the State Key Program of National Natural Science of China(No.62133007);the Natural Science Foundation of Shandong Province(Nos.ZR2021ZD05,ZR2020JQ19,ZR2022JQ08 and ZR2023QB169);Taishan Scholars Program of Shandong Province(Nos.tsqn201812002,ts20190908 and tsqn202211028);Shenzhen Fundamental Research Program(No.JCYJ20190807093405503);China Postdoctoral Science Foundation(No.2022M721913).

摘　　要：Sodium-ion batteries(SIBs)are an attractive battery system because of similar characteristics to lithium-ion batteries(LIBs)and large Na element abundance.Nevertheless,exploring stable,high-capacity and high-rate anode materials for SIBs is still challenging now.Herein,diethylenetriamine(DETA)molecular template derived ultrathin N-doped carbon(NC)layer decorated CoSe_(2)nanobelts(CoSe_(2)/NC)are prepared by solvothermal reaction followed by calcination process.The CoSe_(2)/NC exhibits large potential as an anode for SIBs.Experiments and theoretical calculations reveal that the in situ formed conductive ultrathin NC layer can not only relieve the volume change of CoSe_(2)but also accelerate electron and ion transport.In addition,the nanobelt structure of CoSe_(2)/NC with abundant exposed active sites can obviously accelerate the electrochemical kinetics.Under the synergistic effect of special nanobelt structure and NC layer,the rate as well as cycling performances of CoSe_(2)/NC are obviously improved.A superior capacity retention of 94.8%is achieved at 2 A·g^(-1)after 2000 cycles.When using Na3V2(PO4)3 cathodes,the pouch full batteries can work steadily at 0.5 C,verifying the application ability.CoSe_(2)/NC anodes also exhibit impressive performances in LIBs and potassium-ion batteries(PIBs).

关 键 词：CoSe2 nanobelts ultrathin N-doped carbon layer sodium-ion batteries anode high rate 

分 类 号：TM912[电气工程—电力电子与电力传动] TB383.1[一般工业技术—材料科学与工程]