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

Chuanliang Wei ¹Zhengran Wang ¹Peng Wang ¹Xinlu Zhang ¹Xuguang An ²Jinkui Feng ¹Baojuan Xi ¹Shenglin Xiong¹

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作者信息

1. School of Chemistry and Chemical Engineering,School of Materials Science and Engineering,Shandong University,Jinan 250100,China
2. School of Mechanical Engineering,Chengdu University,Chengdu 610106,China
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Abstract

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.

Key words

Ultrathin CoSe2 nanobelts/N-doped MXene nanosheets/In situ growth/Flexible MXene-based films/Li-S batteries

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基金项目

National Natural Science Foundation of China(U21A2077)

National Natural Science Foundation of China(51972198)

Natural Science Foundation of Shandong Province(ZR2021ZD05)

Natural Science Foundation of Shandong Province(ZR2020JQ19)

Natural Science Foundation of Shandong Province(ZR2023QB169)

Taishan Scholars Program of Shandong Province(ts20190908)

Taishan Scholars Program of Shandong Province(tsqn201812002)

State Key Program of National Natural Science of China(62133007)

Shenzhen Fundamental Research Program(JCYJ20190807093405503)

China Postdoctoral Science Foundation(2022M721913)

出版年

2024

科学通报(英文版)

中国科学院

科学通报(英文版)

CSTPCD

ISSN：1001-6538

参考文献量1

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