碳包覆二硫化铼纳米球的制备及其储钠性能  

Preparation and Sodium Storage Performance of Carbon-Coated Rhenium Disulfide Nanospheres

作　　者：张旭辉 邢琨 Zhang Xuhui;Xing Kun(School of Microelectronics,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学微电子学院,合肥230009

出　　处：《微纳电子技术》2023年第7期1019-1026,共8页Micronanoelectronic Technology

基　　金：国家自然科学基金(62204073);安徽省自然科学基金(2208085QF210)。

摘　　要：二硫化铼(ReS_(2))由于极弱的层间范德华力和独特的1T’相,使其非常适合作为钠离子电池(SIB)的负极材料,但是由于ReS2具有电导率较低和充放电过程中体积膨胀的缺点,制约了其SIB性能的进一步提高。制备了一种碳包覆ReS_(2)(ReS_(2)/C)纳米球复合材料。通过水热反应制成自组装的ReS_(2)纳米球,ReS_(2)纳米球与葡萄糖混合后高温碳化得到ReS_(2)/C,碳在ReS_(2)纳米球间形成均匀的三维(3D)碳导电网络。对ReS_(2)/C负极进行了电化学性能测试。结果表明,3D碳导电网络能够提供电子快速传输的通道,并且3D碳导电网络包覆活性材料可以更好地承受结构应力。得益于均匀碳涂层形成的3D碳导电网络,ReS_(2)/C负极表现出优异的循环稳定性和倍率性能。研究结果表明,ReS_(2)/C负极在电流密度0.1、0.2、0.5、1、2和5 A·g^(-1)时,放电比容量分别为378、330、282、245、211和165 mA·h·g^(-1);ReS_(2)/C负极在电流密度1 A·g^(-1)时,经过2000次循环后放电比容量保持在117 mA·h·g^(-1),这表明碳包覆可以改善钠离子电池的电化学性能。Rhenium disulfide(ReS_(2))is very suitable as the anode material for sodium-ion battery(SIB)due to its extremely weak inter-layer van der Waals force and unique 1T phase.However,due to the shortcomings of low conductivity of ReS_(2)and the volume expansion during charge and discharge,the further improvement of SIB performance is restricted.A carbon-coated ReS_(2)(ReS_(2)/C)nanosphere composite was prepared.Self-assembled ReS_(2)nanospheres were prepared by hydrothermal reaction.ReS,nanospheres were mixed with glucose and carbonized at high temperature to obtain ReS_(2)/C.Carbon formed a uniform three-dimensional(3D)carbon conductive network between ReS,nanospheres.The electrochemical performance of ReS_(2)/C anode was tested.The result shows that the 3D carbon conductive network can provide a fast electron transmission channel,and 3D carbon conductive network coating active material can better withstand the structural stress.Benefiting from the 3D carbon conductive network formed by the uniform carbon coating,ReS_(2)/C anode shows excellent cyclic stability and rate performance.The study results show that at current densities of 0.1,0.2,0.5,1,2 and 5 A·g^(-1),the discharge specific capacities of the ReS_(2)/C anode are 378,330,282,245,211 and 165 mA·h·g^(-1),respectively,and the discharge specific capacity of the ReS,/C anode remains 117 mA·h·g^(-1)at a current density of 1 A·g^(-1)after 2000 cycles,indicating that carbon coating can improve the electrochemical performance of sodium-ion batteries.

关 键 词：钠离子电池 碳包覆 纳米材料 二硫化铼(ReS_(2)) 负极材料 纳米球 

分 类 号：TM912[电气工程—电力电子与电力传动]