蜂窝状WS_(2)/N-rGO复合材料的制备与储锂性能  

Preparation of honeycomb WS_(2)/N-rGO composite material and its lithium storage performance

作　　者：吕悠悠 张现发[1] 徐英明[1] 程晓丽[1] 赵辉[1] 霍丽华[1] LÜYouyou;ZHANG Xianfa;XU Yingming;CHENG Xiaoli;ZHAO Hui;HUO Lihua(Key Laboratory of Functional Inorganic Material Chemistry,Ministry of Education,School of Chemistry and Materials Science,Heilongjiang University,Harbin 150080,China)

机构地区：[1]黑龙江大学化学化工与材料学院功能无机材料化学教育部重点实验室,哈尔滨150080

出　　处：《黑龙江大学自然科学学报》2024年第6期655-662,共8页Journal of Natural Science of Heilongjiang University

基　　金：中央支持地方高校改革发展资金(高水平人才项目);黑龙江省自然科学基金资助项目(B201414)。

摘　　要：WS_(2)因具有高的理论比容量和好的化学稳定性被视为一种很有应用前景的锂离子电池负极材料。然而,目前这类材料在锂化/脱锂过程中还存在体积变化、多硫化物溶解以及Li+扩散动力学较差等问题。以氧化石墨烯(Graphene oxide,GO)为碳源,通过简单的溶剂热法,结合高温烧结制备了蜂窝状WS_(2)/N掺杂还原氧化石墨烯(WS_(2)/N-doped reduced graphene oxide,WS_(2)/N-rGO)复合材料。WS_(2)纳米片在rGO表面均匀生长,rGO与WS_(2)的协同效应不仅使材料具有高的导电性和大的表面积,还可以缓冲体积膨胀。而且N的掺杂还可以引入缺陷,创造大量的反应活性位点,从而提高材料的稳定性和循环性。蜂窝状WS_(2)/N-rGO电极材料在0.1 A·g^(-1)电流密度下进行100次充放电循环后,比容量为830 mA·h·g^(-1)。在1.0 A·g^(-1)下,循环550次后,比容量达到511 mA·h·g^(-1)。WS_(2) is considered a promising negative electrode material for lithium-ion batteries due to its high theoretical specific capacity and good chemical stability.However,currently these materials still face issues such as volume changes during lithiation/delithiation processes,dissolution of polysulfides,and poor Li+diffusion kinetics.Graphene oxide(GO)was used as a carbon source and the honeycomb WS_(2)/N-doped reduced graphene oxide(WS_(2)/N-rGO)composite materials were prepared through a simple solvothermal method combined with high-temperature sintering.WS_(2) nanosheets grow uniformly on the surface of graphene,and the synergistic effect of graphene and WS_(2) not only has high conductivity and large surface area,but also can buffer volume expansion.Moreover,the doping of N can introduce defects,create a large number of reactive active sites,and thus improve the stability and cycling of the material.The honeycomb WS_(2)/N-rGO electrode material has a specific capacity of 830 mA·h·g^(-1) after 100 charge-discharge cycles at a current density of 0.1 A·g^(-1).After 550 cycles at 1.0 A·g^(-1),the specific capacity reaches 511 mA·h·g^(-1).

关 键 词：多级结构 WS_(2) rGO 锂离子电池 负极材料 

分 类 号：O646[理学—物理化学]