【作者】 杨潇薇； 兰伟； 崔艳华； 刘效疆；

【Author】 Xiaowei Yang;Yanhua Cui;Wei Lan;Xiaojiang Liu;Institute of Electronic Engineering,China Academy of Engineering Physics;

【机构】 电子工程研究所中国工程物理研究院；

【摘要】 MnO₂由于具有独特的结构、化学组成和优越的电化学性能,被认为是一种理想的金属氧化物电极材料。石墨烯因其独特的二维结构、良好的导电性和导热性,可作为导电添加剂与金属氧化物复合,形成金属氧化物/石墨烯纳米复合材料[1-3]。本文采用水热法合成了MnO₂/石墨烯复合材料,摸索了反应物浓度、反应温度、反应时间对MnO₂/石墨烯产物形貌、结构、组成的影响;同时将MnO₂/石墨烯作为正极材料制备成单体热电池,进行了不同电流密度、不同温度条件下电性能的测试。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-MnO₂变成了α-MnO₂,产物形貌由花球式结构变成了纳米棒式结构。单体电池以30mA/cm²放电时,初始放电电压为3.12V,放电过程中有高且平稳的放电平台,平台电压截止2.0V时,比容量达到639.5 mAh/g。更多还原

【Abstract】 The MnO₂/graphene was synthesized by hydrothermal method.The effect of reaction concentration,reaction temperature,reaction time on morphology,structure and composition for products.MnO₂/graphene was also used as positive electrode in thermal battery and discharge curves of single thermal battery were tested at different current density and different temperature.The results showed that along with the decrease of the concentration of Mn in the reaction system,crystalline phase structure of product was changed from δ-MnO₂ intoα-MnO₂ and morphologies of product was changed from flower-like into stick-like.When single thermal battery was discharged at 30 mA/cm²,the initial discharge voltage was 3.12 V and discharge platform was high and stable.When the platform voltage was cutoff at 2.0V,the specific capacity can reach 639.5 mAh/g.更多还原