首页|Superior and safer lithium sulfur batteries realized by robust polysulfides-retarding dam with high flame retardance

Superior and safer lithium sulfur batteries realized by robust polysulfides-retarding dam with high flame retardance

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The unparalleled energy density has granted lithium-sulfur batteries(LSBs)with attractive usages.Unfortunately,LSBs still face some unsurpassed challenges in industrialization,with polysulfides shut-tling,dendrite growth and thermal hazard as the major problems triggering the cycling instability and low safety.With the merit of convenience,the method of designing functional separator has been adapted.Concretely,the carbon aerogel confined with CoS2(CoS2-NCA)is constructed and coated on Celgard separator surface,acquiring CoS2-NCA modified separator(CoS2-NCA@C),which holds the pro-moted electrolyte affinity and flame retardance.As revealed,CoS2-NCA@C cell gives a high discharge capacity 1536.9 mAh/g at 1st cycle,much higher than that of Celgard cell(987.1 mAh/g).Moreover,the thermal runaway triggering time is dramatically prolonged by 777.4 min,corroborating the promoted thermal safety of cell.Noticeably,the higher coulombic efficiency stability and lower overpotential jointly confirm the efficacy of CoS2-NCA@C in suppressing the lithium dendrite growth.Overall,this work can provide useful inspirations for designing functional separator,coping with the vexing issues of LSBs.

Lithium-sulfur batteriesThermal safetyFlame retardancySeparator

Junling Wang、Yanfang Cao、Zhirong Wang、Yinquan Zhao、Chuang He、Fudong Zhao、Chaoling Han、Shui Yu

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Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control,College of Safety Science and Engineering,Nanjing Tech University,Nanjing 211816,Jiangsu,China

Department of Architecture and Civil Engineering,City University of Hong Kong,Hong Kong 999077,China

School of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 211816,Jiangsu,China

National Natural Science Foundation of ChinaHongkong Scholar ProgramNational Science Foundation for Postdoctoral Scientists of ChinaNational Science Foundation for Postdoctoral Scientists of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaJiangsu Provincial Double-Innovation Doctor ProgramNatural Science Foundation of the Jiangsu Higher Education InstitutionsOpen Fund of the State Key Laboratory of Fire Science(SKLFS)ProgramPostgraduate Research & Practice Innovation Program of Jiangsu Province

52104197XJ20220222021M6915492021M7030825227239652306090JSSCBS2021040221KJB620001HZ2022-KF04SJCX22-0457

2024

10.1016/j.jechem.2023.09.047

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.89(2)
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