VS_(4)/rGO纳米复合材料的制备及储钠性能研究  

Research on the Preparation and Sodium-ion Storage Performance of VS_(4)/rGO Nanocomposites

作　　者：徐莺歌 王世伟[2] 梁补女 毛生红 孔令斌[4] XU Yingge;WANG Shiwei;LIANG Bunü;MAO Shenghong;KONG Lingbin(Department of Basic Subjects,Lanzhou Institute of Technology,Lanzhou 730050,China;Science and Technology on Vacuum Technology and Physical Laboratory,Lanzhou Institute of physics,Lanzhou 730000,China;School of Materials Engineering,Lanzhou Institute of Technology,Lanzhou 730050,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhouu 730050,China)

机构地区：[1]兰州工业学院基础学科部,兰州730050 [2]兰州空间技术物理研究所真空技术与物理重点实验室,兰州730000 [3]兰州工业学院材料工程学院,兰州730050 [4]兰州理工大学材料科学与工程学院,兰州730050

出　　处：《真空与低温》2023年第4期348-355,共8页Vacuum and Cryogenics

基　　金：国家自然科学基金(51971104、51762031)。

摘　　要：电极材料的尺寸和电导率在钠离子电池的反应动力学中起着重要的作用。VS_(4)具有高的理论比容量,但电导率较低,为了提高VS_(4)的储钠性能,本文采用一步水热法制备了VS_(4)/rGO纳米复合材料,对其晶体结构、微观组织及储钠性能进行了研究。结果表明:当电流密度为0.1 A/g时,160℃水热条件下制备的VS_(4)/rGO,经100圈循环,放电比容量为300 mA·h/g;当电流密度为0.5 A/g时,经300圈长循环,放电容量为211.4 mA·h/g;在0.1、0.2、0.5、1、2、5 A/g的电流密度下,放电比容量分别为430、400、300、200、150、100 mA·h/g,具有良好的倍率性能。VS_(4)/rGO具有出色的储钠性能是由于VS_(4)纳米颗粒与高导电性石墨烯网络之间的协同效应缩短了Na^(+)的扩散路径,扩大了电解液与电极材料的接触面积,提高了VS_(4)的电化学反应可逆性。The size and conductivity of electrode materials play an important role in reaction kinetics of the sodium-ion batteries.VS_(4) has high theoretical specific capacity but low conductivity.In order to improve the sodium-ion storage performance of VS_(4),VS_(4)/rGO nanocomposites were prepared by one-step hydrothermal method.The results showed that the specific discharge capacity of VS_(4)/rGO prepared at 160°C under hydrothermal condition was 300 mA·h/g after 100 cycles at 0.1 A/g.When the current density was 0.5 A/g,the discharge capacity was 211.4 mA·h/g after 300 cycles.At current densities of 0.1,0.2,0.5,1,2 and 5 A/g,the discharge specific capacities were 430,400,300,200,150 and 100 mA·h/g,respectively,showed favorable rate performance.The VS_(4)/rGO has excellent sodium-ion storage performance due to the synergistic effect between VS_(4) nanoparticles and the highly conductive graphene network,which shorted the diffusion path of Na+,expanded the contact area between the electrolyte and electrode materials,and improved the electrochemical reaction reversibility of VS_(4).

关 键 词：钠离子电池 VS_(4) 石墨烯 电化学性能 

分 类 号：TB383[一般工业技术—材料科学与工程] O484[理学—固体物理]