首页|One-step growth of ultrathin CoSe2 nanobelts on N-doped MXene nanosheets for dendrite-inhibited and kinetic-accelerated lithium-sulfur chemistry

One-step growth of ultrathin CoSe2 nanobelts on N-doped MXene nanosheets for dendrite-inhibited and kinetic-accelerated lithium-sulfur chemistry

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The practical application of lithium-sulfur(Li-S)batteries is inhibited by the shuttle effect of lithium polysulfides(LiPSs)and slow polysulfide redox kinetics on the S cathode as well as the uncontrollable growth of dendrites on the Li metal anode.Therefore,both cathode and anode sides must be considered when modifying Li-S batteries.Herein,two-dimensional(2D)ultrathin CoSe2 nanobelts are in situ grown on 2D N-doped MXene nanosheets(CoSe2@N-MXene)via one-step solvothermal process for the first time.Owing to its unique 2D/2D structure,CoSe2@N-MXene can be processed to crumpled nanosheets by freeze-drying and flexible and freestanding films by vacuum filtration.These crumpled CoSe2@N-MXene nanosheets with abundant active sites and inner spaces can act as S hosts to accelerate polysulfide redox kinetics and suppress the shuttle effect of LiPSs owing to their strong adsorption ability and cat-alytic conversion effect with LiPSs.Meanwhile,the CoSe2@N-MXene film(CoSe2@NMF)can act as a cur-rent collector to promote uniform Li deposition because it contains lithiophilic CoSe2 and N sites.Under the systematic effect of CoSe2@N-MXene on S cathode and Li metal anode,the electrochemical and safety performance of Li-S batteries are improved.CoSe2@NMF also shows excellent storage performances in flexible energy storage devices.

Ultrathin CoSe2 nanobeltsN-doped MXene nanosheetsIn situ growthFlexible MXene-based filmsLi-S batteries

Chuanliang Wei、Zhengran Wang、Peng Wang、Xinlu Zhang、Xuguang An、Jinkui Feng、Baojuan Xi、Shenglin Xiong

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School of Chemistry and Chemical Engineering,School of Materials Science and Engineering,Shandong University,Jinan 250100,China

School of Mechanical Engineering,Chengdu University,Chengdu 610106,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Shandong ProvinceNatural Science Foundation of Shandong ProvinceNatural Science Foundation of Shandong ProvinceTaishan Scholars Program of Shandong ProvinceTaishan Scholars Program of Shandong ProvinceState Key Program of National Natural Science of ChinaShenzhen Fundamental Research ProgramChina Postdoctoral Science Foundation

U21A207751972198ZR2021ZD05ZR2020JQ19ZR2023QB169ts20190908tsqn20181200262133007JCYJ201908070934055032022M721913

2024

10.1016/j.scib.2024.03.043

科学通报(英文版)
中国科学院

科学通报(英文版)

CSTPCD
ISSN：1001-6538
年,卷(期)：2024.69(13)
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