首页|Enlarged interlayer of separator coating enabling high-performance lithium-sulfur batteries

Enlarged interlayer of separator coating enabling high-performance lithium-sulfur batteries

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Lithium-sulfur batteries have been intensively studied due to their high theoretical energy density and abundant sulfur resources.However,their commercial application is hindered by the low redox kinetics and high sulfur losses.In principle,in the design of cathodes and separators,the adsorption toward lithium-polysulfides should be enhanced and the conversion of soluble high-order lithium-polysulfides should be catalyzed.Herein,a KV3O8·0.75H2O separator is designed as an effective lithium-polysulfides mediator in lithium-sulfur batteries.The intercalated K+would enlarge the interlayer spacing of vanadium oxides,preventing the collapse of the layer structure and improving the electrical/ion conductivity of the interface.Moreover,the KV3O8·0.75H2O modified separator possess a prior adsorption and high redox kinetics toward lithium-polysulfides due to the enhanced diffusion kinetics,which guarantees the high-rate capability and efficient utilization of sulfur.As a result,lithium-sulfur batteries exhibit a high capacity of 1362 mAh·g-1 and a long lifespan with a low capacity loss of 0.073％per cycle.This work may provide an alternative way to establish a functional separator to balance the adsorption and conversion of polysulfides during the redox back and forth.

Yanqi Feng、Hui Liu、Xiaoting Liu、Qiongqiong Lu

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School of Materials & Environment Engineering,Chengdu Technological University,Chengdu 611730,China

School of Materials Science and Engineering,Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials,Shaanxi University of Science and Technology,Xi'an 710021,China

Green Catalysis Center,and College of Chemistry,Zhengzhou University,Zhengzhou 450001,China

Institute of Materials,Henan Key Laboratory of Advanced Conductor Materials,Henan Academy of Sciences,Zhengzhou 450046,China

Leibniz Institute for Solid State and Materials Research(IFW),Dresden e.V.,Dresden 01069,Germany

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Joint Fund of Henan Province Science and Technology R&D ProgramStartup Research of Henan Academy of SciencesNational Natural Science Foundation of ChinaNatural Science Foundation of Shaanxi ProvinceGraduate Innovation Found of Shaanxi University of Science and TechnologyScientific Research Project of Chengdu Technological UniversityNational Key R&D Program of ChinaChina Scholarship Council

225200810093231817001512721472015JM52082023RC0012019YFC1520100

2024

10.1007/s11705-024-2385-5

化学科学与工程前沿
高等教育出版社

化学科学与工程前沿

CSTPCDEI
影响因子：0.172
ISSN：2095-0179
年,卷(期)：2024.18(2)
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