纳米α-MnS的溶剂热合成及电化学性能研究

摘要

以锰粉和硫粉为原料,以乙二胺为溶剂,分别在180℃和160℃下,采用溶剂热法成功地合成了纳米α -MnS(对应分别记为MnS-1和MnS-2).利用XRD,SEM手段对目标产物MnS-1和MnS-2的结构和形貌进行了表征,结果表明:溶剂热法合成的样品具有单一纯相的面心立方α -MnS结构.溶剂热的温度对样品的形貌有较大的影响:在180℃温度下反应2d的样品MnS-1呈棒状和片状,棒粗20～30 nm,棒长200～ 250 nm.在160℃温度下反应5d的样品MnS-2呈片状,片厚为30～40 nm.并对该材料的电化学性质进行了初步测试,实验发现:合成的纳米α -MnS材料作为电极时,MnS-1和MnS-2的首次放电容量分别为957.2mAh/g和1 033mAh/g,而且具有一定的循环性能,可望得到应用.%MnS nanocrystals were prepared by a solvothermal method using Mn powder and Surfur powder as the reactants. The obtained products were characterized by XRD and SEM, respectively. The results indicated that as-obtained samples (MnS-1 and MnS-2) were rock-salt-type a-MnS. The electrochemical properties of the MnS nanocrystals were also studied. The initial lithiation capacities of the a -MnS nanocrystals were 957. 2 mAh/g and 1 033. 1 mAh/g, respectively. The MnS-1 sample prepared at 180 ℃ for 2 days exhibited a better cycling performance related to the smaller particle size and narrower particle size distribution,compared with the MnS-2 sample prepared at 160 ℃ for 5 days. The as-prepared a -MnS materials have potential applications as an alternative anode material for lithium-ion batteries in the future through modification or encapsulation.