液态合金/二硫化钼自修复负极材料的制备及其电化学性能  

Preparation and Eletrochemical Study of Liquid Metal/MoS2 Self-Repairing Anode Materials for Lithium-Ion Batteries

作　　者：朱传晖 郭磊 胡涛 龚兴厚 吴崇刚 郑譞 ZHU Chuanhui;GUO Lei;HU Tao;GONG Xinghou;WU Chonggang;ZHENG Xuan(Hubei Provincial Key Laboratory of Green Materials for Light Industry,School of Materials and Chemical Engineering,Hubei University of Technology,Wuhan 430068,China;Hubei Longzhong Laboratory,Xiangyang 441002,Hubei,China)

机构地区：[1]湖北工业大学材料与化学工程学院,绿色轻工材料湖北省重点实验室,武汉430068 [2]湖北隆中实验室,湖北襄阳441002

出　　处：《硅酸盐学报》2024年第6期2024-2031,共8页Journal of The Chinese Ceramic Society

基　　金：湖北省自然科学基金青年项目(2022CFB899);国家自然科学基金青年科学基金项目(52303081)。

摘　　要：二硫化钼在可充电电池等能源存储领域具有广阔的应用前景,然而其电子导电性较差、充放电过程中易粉化和团聚等问题限制了其发展。采用水热法一步合成了液态合金(LM)和二硫化钼(MoS_(2))的复合负极材料(LM@MoS_(2))。通过XRD、SEM等综合表征方法对复合材料的结构和形态特性进行了研究。结果表明,液态合金通过静电吸附和配位键等方式有效结合于MoS_(2),形成稳定的复合结构。此外,复合材料具有较高的可变形性和化学稳定性,促进了电极材料裂纹表面的修复,减少了内部氧化还原反应,提高了锂离子电池的循环稳定性。当LM与MoS_(2)质量比为2:1时,复合材料表现出最佳性能。在0.1 A·g^(−1)的电流密度下,经过100次循环,复合材料的比容量稳定在656.1 m A·h·g^(−1),容量保持率达74.3%,该研究为锂离子电池电极的裂纹自修复提供了新思路。Introduction Two-dimensional transition metal dichalcogenides(TMDCs)have attracted much attention due to their unique“sandwich”structure.As a typical two-dimensional layered transition metal sulfide,MoS_(2) has a layered structure composed of S-Mo-S triple layers with covalent bonds.The atoms in MoS_(2) layer are combined by covalent bonds,while the interaction between layers depends on the van der Waals forces.This special S—Mo—S layered structure is conductive to the rapid diffusion of lithium ions,and the intercalation of lithium ions between layers during a charging and discharging process does not affect the volume change.However,MoS_(2) has some problems such as poor conductivity and easy decomposition of the structure,severely hindering the development of MoS_(2) electrode materials.This paper was to composite a liquid metal(LM)with MoS_(2) materials.Among them,LM has an excellent ion and electron conductivity,which can improve the conductivity of MoS_(2).The moderate interlayer distance of MoS_(2) can restrict LM droplets within the framework,thereby allowing LM to better exert its self-healing properties for the preparation of negative electrode materials with self-healing capabilities.Methods 400 mg of LM was firstly added into 50 mL of N,N-Dimethylformamide(DMF),and then a certain amount of phosphomolybdic acid was added into the LM and DMF under ultrasound.Also,the required thiourea and catalyst NaBH4 were mixed in a beaker in a molar Mo:S ratio of 1.0:2.6.Afterwards,the two solutions were transferred to a polytetrafluoroethylene liner and reacted at 200℃for 24 h.The resulting reaction solutions were washed with deionized water,N,N-Dimethylformamide,and anhydrous ethanol,respectively.Finally,the washed materials were dried in a vacuum drying oven at 70℃for 12 h to obtain the final reaction product.The prepared active material was mixed with acetylene carbon black and polyvinylidene fluoride(PVDF)in a ratio of 8:1:1.The material was fully ground in a ball mill in the presence of an appropri

关 键 词：二硫化钼 液态合金 锂离子电池 负极材料 自修复 

分 类 号：O613.51[理学—无机化学]