Li-Rich Organosulfur Cathode with Boosted Kinetics for High-Energy Lithium-Sulfur Batteries

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外文摘要：Organosulfur materials containing sulfur-sulfur bonds are an emerging class of high-capacity cathodes for lithium storage.However,it remains a great challenge to achieve rapid conversion reaction kinetics at practical testing conditions of high cathode mass loading and low electrolyte utilization.In this study,a Li-rich pyrolyzed polyacrylonitrile/selenium disulfide(pPAN/Se2S3)composite cathode is synthesized by deep lithiation to address the above challenges.The Li-rich molecular structure significantly boosts the lithium storage kinetics by accelerating lithium diffusivity and improving electronic conductivity.Even under practical test conditions requiring a lean electrolyte(Electrolyte/sulfur ratio of 4.1 μL mg-1)and high loading(7 mg cm-2 of pPAN/Se2S3),DL,pPAN/Se2S3 exhibits a specific capacity of 558 mAh g-1,maintaining 484 mAh g-1 at the 100th cycle with an average Coulombic efficiency of near 100％.Moreover,it provides(electro)chemically stable Li resources to offset Li consumption over charge-discharge cycles.As a result the as-fabricated anode-free cell shows a superior cycling stability with 90％retention of the initial capacity over 45 cycles.This study provides a novel approach for fabricating high-energy and stable Li-SPAN cells.

作者：

Ting Ma、Jiaojiao Deng、Yuxiao Lin、Qinghua Liang、Liang Hu、Xiaohu Wang、Jun Liu、Xinsheng Zhao、Yinwei Li、Ding Nan、Xiaoliang Yu

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作者单位：

College of Chemistry and Chemical Engineering,Inner Mongolia University,Hohhot 010021,China

Inner Mongolia Key Laboratory of Graphite and Graphene for Energy Storage and Coating,School of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China

Shenzhen Key Laboratory on Power Battery Safety and Shenzhen Geim Graphene Center,Tsinghua Shenzhen International Graduate School(SIGS),Shenzhen 518071,China

School of Physics and Electronic Engineering,Jiangsu Normal University,Xuzhou 221116,China

Key Laboratory of Rare Earth,Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341000,China

Department of Mechanical Engineering,Research Institute for Smart Energy,The Hong Kong Polytechnic University,Hong Kong,China

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基金：

Hong Kong Polytechnic UniversityHong Kong Polytechnic UniversityHong Kong Polytechnic UniversityInner Mongolia Scientific and Technological Achievements Transformation ProjectInner Mongolia Major Science and Technology ProjectAlashan League's Project of Applied Technology Research and Development FundLocal science and Technology Development Project of the Central GovernmentLocal science and Technology Development Project of the Central GovernmentNational Natural Science Foundation of ChinaNatural Science Fund for Colleges and Universities in Jiangsu ProvinceNatural Science Foundation of Jiangsu ProvinceJiangsu Outstanding Professors

项目编号：

ZZLMYY4VYY5KCGZH20181322020ZD0024AMYY2020-012021ZY00062022ZY00115220224522KJB430004BE2020759

出版年：

2024

DOI：

10.1002/eem2.12704

能源与环境材料(英文)

ISSN：

年,卷(期)：2024.7(4)