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Synthesis and electrochemical properties of bimetallic-doped porous carbon cathode material
Author NameAffiliationE-mail
CAO Xiangyu Department of Materials and Chemical Engineering, Taiyuan University, Taiyuan 030032, China  
ZHANG Jiaying Department of Materials and Chemical Engineering, Taiyuan University, Taiyuan 030032, China  
FENG Yun Department of Materials and Chemical Engineering, Taiyuan University, Taiyuan 030032, China  
SHEN Linkun Department of Materials and Chemical Engineering, Taiyuan University, Taiyuan 030032, China  
ZHANG Xiuling Department of Materials and Chemical Engineering, Taiyuan University, Taiyuan 030032, China  
YAN Juanzhi Department of Materials and Chemical Engineering, Taiyuan University, Taiyuan 030032, China yanjuanzhi@tyu.edu.cn 
Abstract: A bimetallic (Co, Fe) and nitrogendoped porous carbon/sulfur composite material (e-CF@NPC/S, CF represents CoFe alloy, NPC represents nitrogen-doped porous carbon) was prepared by hydro-thermal reaction, carbonization, acid etching, and S loading. Then a series of composite materials with different nuclear shell ratios were obtained by changing the ratio of raw materials. The structural analysis and electrochemical properties test results of these composite materials show that core-shell structure porous carbon composite had a rich surface area and space to serve active substance loading and volume changes. The spatial domain restriction of the shell can be helpful to anchor sulfur and polysulfide (LiPSs) inside the structure, however, the shell can also block ion diffusion. The catalytic and absorptive capability of Co-Fe alloy depends on the quantities of active sites. Cathodes of e-CF@NPC-3/S show the best electrochemistry performance with a capacity retention rate of 92.35% at 0.2C after 100 cycles (initial capacity was 996.9 mAh·g-1). After 300 cycles at 1C, it can achieve a capacity decay rate of 0.049% per cycle (initial capacity was 684.5 mAh·g-1).
Keywords: metal-doped  lithium-sulfur battery  cathode material  composite material  core-shell structure
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CAO Xiangyu,ZHANG Jiaying,FENG Yun,SHEN Linkun,ZHANG Xiuling,YAN Juanzhi.Synthesis and electrochemical properties of bimetallic-doped porous carbon cathode material[J].Chinese Journal of Inorganic Chemistry,2025,41(3):509-520.
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Chinese Journal of Inorganic Chemistry