热电池用CoS2正极材料水热合成及其性能研究  

Hydrothermal Synthesis and Properties of CoS_2 Cathode Materials for Thermal Batteries

作　　者：杨潇薇 刘波[1] 李科[1] 王静 YANG Xiao-wei;LIU Bo;LI Ke;WANG Jing(Institute of Electronic Engineering,China Academy of Engineering Physics,Mianyang 621999,China)

机构地区：[1]中国工程物理研究院,电子工程研究所,绵阳621999

出　　处：《人工晶体学报》2018年第3期623-628,634,共7页Journal of Synthetic Crystals

基　　金：中国工程物理研究院电子工程研究所创新基金(S20170601)

摘　　要：以硝酸钴(Co(NO_3)_2·6H_2O)和硫脲(NH2CSNH2)为原料,在不同的反应物浓度下水热合成了不同形貌的Co S2材料,利用X射线衍射(XRD)、扫描电子显微镜(SEM)和X射线光电子能谱技术(XPS)对产物进行了表征,最后将石墨烯添加到制备的Co S2中作为正极材料制备成单体热电池进行恒流和脉冲放电测试。SEM、XRD测试结果表明,随着反应体系中反应物(Co(NO_3)_2·6H_2O)量从0.02 mol/L增加到0.08 mol/L,产物Co S2材料纳米棒尺寸逐渐缩短,球形颗粒尺寸趋于均匀,团聚现象更加明显;材料晶相结构没有发生改变,都为立方晶系的Co S2;XPS测试结果表明合成的材料元素价态分别为Co2+和S-1。当恒流放电电流密度较大增加到0.8 A/cm2时,Co S2/石墨烯阴极材料有更好的电性能;脉冲放电测试结果表明,Co S2材料制备的单体电池内阻明显小于Fe S2材料,在放电初期的平稳阶段,内阻约小0.5Ω。CoS2 with different morphologies are hydrothermal synthesized using cobalt nitrate(CO(N0 3)2?6H20)and thiourea(NH2 CSNH2)as raw materials in different reactant concentration.The products are characterized by X ray diffraction(XRD)、scanning electron microscopy(SEM)and X ray photoelectron spectroscopy(XPS).Finally,graphene is added to the synthetic CoS2,which is used as the cathode materials to prepare the single cell for constant current and pulse discharge test.The SEM and XRD experimental results show that with the reactant in the reaction system of CO(N0 3)2?6H20 increasing from 0.02 mol/L to 0.08 mol/L,CoS2 nanorods gradually shorten product size.The size of spherical particles tend to be uniform and agglomeration phenomenon is more obvious.The crystal structure of the material is not changed,it is also cubic CoS2.The XPS test results show that the valence states of the synthesized materials are Co2+and S 1,respectively.When the galvanostatic discharge current density increasing to 0.8 A/cm2,CoS2/graphene cathode material have better electrical performance.Pulse discharge test results show that the single battery internal resistance CoS2 material preparation is significantly less than the FeS2 material.And at the stable stage in initial stage of discharge,the internal resistance is reduced about 0.5Ω.

关 键 词：热电池 水热法 正极材料 COS2 石墨烯 

分 类 号：O782[理学—晶体学]