二氧化锰超细粉体的制备及其电化学性能Preparation of ultrafine MnO2 particle and its electrochemical performance
李青,胡云楚,汤林
摘要(Abstract)：
以MnCl2和NaOH为原料,利用超临界流体干燥技术(SCFD)制备了MnO2超细粉体。采用TG-DTA、XRD、粒度分析仪、透射电镜、恒流放电等方法对样品的热稳定性、粒子的形貌、电化学性能进行了表征和测试。研究表明,采用超临界流体干燥技术可以制备出颗粒细、大小均匀的纳米粒子;酸化后的纳米MnO2的电化学性能大大提高,中等负荷放电时,累积容量比电解MnO2提高了24%;重负荷放电时,放电容量提高幅度更大,放电容量较电解MnO2提高110%(-0.9V)。
关键词(KeyWords)： 临界流体干燥;γ-MnO2;电化学性能
基金项目(Foundation): 国家自然科学基金项目(30471358);; 中南林学院引进人才基金(315-0139)
作者(Author): 李青,胡云楚,汤林
参考文献(References)：
- [1]李东升,王尧宇,刘萍,等.超声辐射沉淀法制备纳米-γMnO2的研究[J].无机化学学报,2005,21(2):202-206.LI Dong-sheng,WANG Yao-yu,LIU Ping,et al.Preparation of nanosized-γMnO2by precipitation under ultrasound radiation[J].Chinese Journal of InorganicChemistry,2005,21(2):202-206.
- [2]马淳安,楼颖伟,赵峰鸣,等.纳米MnO2的制备及电化学性能[J].中国有色金属学报,2004,14(10):1736-1741.MA Chun-an,LOU Ying-wei,ZHAO Feng-ming,et al.Systhesis and characterization of nano-size manganese dioxide[J].The Chinese Journal of NonferrousMetals,2004,14(10):1736-1741.
- [3]黄坤,刘熙.纳米级电池活性材料的研究进展[J].电池工业,2001,6(3)133-136.HUNG Kun,LIU Xi.Development and research of nanophase active materials of battery[J].Batteries Industry,2001,6(3)133-136.
- [4]Sugantha M,Ramakrishnan P A,Hermnann A M,et al.Nanostructured MnO2for Li batteries[J].International J Hygrogen Energy,2003,28:597-600.
- [5]刘玲,夏熙.纳米电极材料的制备及其电化学性能研究[J].电化学,1998,4(2):329-330.LIU Ling,XIA Xi.Studies on the preparation of nanophase electrode materials and its electrochemical properties[J].Electrochemistry,1998,(2):329-330.
- [6]夏熙,李娟,李文清.纳米MnO2的固相合成及其电化学性能研究(Ⅱ)[J].高等学校化学学报,1999,20(10):1584-1588.XIA Xi,LI Juan,LI Wen-qing.Synthesis and electrochemical properties of nanophase MnO2by solid-phase reaction(Ⅱ)[J].Chemical J ChineseUniversities,1999,20(10):1584-1588.
- [7]YUAN Liang-jie,LI Zi-cheng,SUN Juang,et al.Synthesis and characterization of activated MnO2[J].Materials Letters,2002,4093:1-4.
- [8]Kim Hyung-Sun,Kim Hyun-Joong,Cho Won,et al.Discharge characteristics of chemically prepared MnO2and electrolytic MnO2in nonaqueous electrolytes[J].J Power Sources,2002,112:660-664.
- [9]梁丽平,高荫本,陈诵英.共沉淀—超临界干燥法合成CaO—ZrO2复合超细粉体及烧结性能研究[J].硅酸盐通报,1998(3):17-23.LIANG Li-ping,GAO Yin-ben,CHEN Song-ying.Preparation of CaO—ZrO2ultrafine powder by coprecipitation-supercritical fluid drying method andinvestigation on its sintering powders[J].Bulletin of the Chinese Ceramic Society,1998(3):17-23.
- [10]张池明,陈诵英.多孔超细粒子的制备[J].粉体技术,1995,1(3):18-25.ZHANG Chi-ming,CHEN Song-ying.Preparation of the porous ultrafine particle[J].Powder Science and Technilogy,1995,1(3):18-25.
- [11]Kordesch K.电池组[M].夏熙,译.北京:轻工业出版社,1981.
文章评论(Comment)：
|
||||||||||||||||||
|
||||||||||||||||||