MnO_2/石墨烯水热合成及其在热电池中的应用  

Hydrothermal synthesis of MnO_2/graphene and its application in thermal battery

作　　者：杨潇薇 杨坤坤[2] 杨兆堂[1] 兰伟[1] 杨少华[2] 

机构地区：[1]中国工程物理研究院电子工程研究所,四川绵阳621999 [2]沈阳理工大学环境与化学工程学院,辽宁沈阳110159

出　　处：《电源技术》2018年第1期61-64,共4页Chinese Journal of Power Sources

基　　金：中国工程物理研究院科学技术发展基金(2014B0302043)

摘　　要：采用水热法合成了MnO_2/石墨烯复合材料,利用扫描电子显微镜法(SEM)、X射线衍射光谱法(XRD)、傅里叶变换红外光谱法(FT-IR)研究了反应物浓度对MnO_2/石墨烯产物形貌、结构、组成的影响;同时将MnO_2/石墨烯作为正极材料制备成单体热电池,进行脉冲放电曲线的测试。测试结果表明:随着反应体系中锰源浓度的降低,产物晶相结构发生了较大变化,由δ-MnO_2变成了α-MnO_2,产物形貌由花球式结构变成了纳米棒式结构。单体电池以10 m A/cm2,其间加以200 m A/cm2电流脉冲放电时,初始放电电压为3.192 V,放电过程中有高且平稳的放电平台;初始放电时电池内阻为3.63Ω,随着放电深度的增加,电池内阻呈现先减小后增加的变化趋势。MnO_2/grapheme(MnO_2/G) composites were synthesized by hydrothermal method. The effect of reactant concentration on the morphology, structure and composition of MnO_2/G was studied by SEM, XRD and FT-IR.MnO_2/G was used as the cathode material to prepare the thermal cell, and the pulse discharge curve was tested. The test results show that with the decrease of manganese source concentration in the reaction system, the phase structure is changed from d-MnO_2 into a-MnO_2, and the morphology of product is changed from ball type structure into nanorod structure. When the single cell is discharged at current density of 10 m A/cm2, during which 200 mA/cm2 pulse current is applied, the initial discharge voltage is 3.192 V and there is a high and stable discharge platform during the discharge. The initial internal resistance of single cell is 3.63 Ω, and with increase of discharge depth, the internal resistance of the battery firstly decreases and then increases.

关 键 词：热电池 MnO2/石墨烯 水热法 电性能 

分 类 号：TM911[电气工程—电力电子与电力传动]