摘要
为了获得高性能的锂硫电池正极材料,采用先超声分散再进行热处理的方法制备了负载ZnS的介孔炭复合材料(ZnS/MC),进而用热复合法获得负载有ZnS的介孔炭复合硫正极材料(ZnS/MC/S)。XRD、SEM、EDS和N2吸附脱附等温线表明,当ZnS含量低于17wt%时,通过超声波分散,ZnS可以均匀负载到介孔炭中;但热处理或提高ZnS含量时ZnS会发生聚集,形成闪锌矿型ZnS晶相。循环伏安测试表明,ZnS对多硫离子的氧化起促进作用;充放电测试表明,ZnS/MC/S电极的初始放电比容量为1354.6 mAh/g,首次充放电库仑效率为98.7%;50次循环后容量仍有650 mAh/g。
With the aim to obtain high performance cathode materials for lithium-sulfur batteries, composite of mesoporous carbon （MC） loaded with ZnS （ZnS/MC） was prepared through ultrasonic dispersion and heat treatment. The as-prepared composite was blended with elemental sulfur by heating, then cathode materials （ZnS/MC/S） was ob- tained. The ZnS/MC composite was characterized by XRD, SEM, EDS and N2 adsorption-desorption isotherms. The results showed that ZnS particle was uniformly loaded to the surface of MC through ultrasonic dispersion when con- tent of ZnS was less than 17wt%. ZnS nanoparticles aggregated to form sphalerite ZnS by heat treatment or increasing content of ZnS. Cyclic voltammetry test showed that ZnS accelerated the oxidation process of polysulfides. Charge/ discharge tests indicated that the initial discharge specific capacity was 1354.6 mAh/g, while the coulombic efficiency of the first charge and discharge was 98.7%. The capacity still remained 650 mAh/g after 50 cycles.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第10期1127-1131,共5页
Journal of Inorganic Materials
基金
国家基础科学人才培养基金(J1103303)~~
关键词
锂硫电池
ZNS
介孔炭
超声波分散
循环性能
lithium sulfur battery
ZnS
mesoporous carbon
ultrasonic dispersion
cyclic performance
