作　　者： ; ; ; ;

机构地区： 华南理工大学

出　　处： 《电源技术》 2010年第7期650-653,共4页

摘　　要： 用不同阴离子的二价锰化合物和高锰酸钾水热反应生成二氧化锰,研究不同阴离子,对二氧化锰结构、形态和放电性能的影响。通过X射线衍射(XRD)、扫描电子显微镜(SEM)和恒电流充放电测试等方法对二氧化锰的结构、形态和电化学性能进行表征。结果表明,不同阴离子对二氧化锰的结构、晶型转化和形态等有显著影响。(SO_4)^(2-)有利于形成α-MnO_2单相晶体,且α-MnO_2晶体不会随着反应时间的增加而转化为其它晶型。γ-MnO_2只会在含有(Cl~)-和(NO_3)^-的溶液中形成,而β-MnO_2较容易在含有Ac^-离子的溶液中形成。用反应时间为7h的MnO_2((SO4)^(2-))、MnO_2(Ac-)、MnO_2((NO_3)^-)和MnO_2(Cl^-)组装电池,初次放电容量分别为207、120、20_3、181 mAh/g,MnO_2((SO_4)^(2-))的初次放电容量较高。 Manganese dioxide was prepared by hydrothermal reaction of potassium permanganate and manganese （11） compounds which had different anions, and the influence of different anions on their structure, morphology and electrochemical characteristics was studied. The crystal structure, morphology and electrochemical characteristics of manganese dioxide were investigated by XRD, SEM and constant current discharge-charge experiments. The experimental results indicate that the different anions have significant influence on the structure, crystal transformation and morphology of manganese dioxide.α-MnO2 is likely to be formed in SO42- solution and can not change to other polymorph of MnO2 when the hydrothermal reaction time is longer .γ-MnO2 is always formed in solution which contains Cl- and NO3- anions and ,β -MnO2 can easily be formed in solution which has Ac- anion. MNO2（SO42-）, MnO2（Ac-）, MnO2（NO3-） and MnO2（CI-） prepared in 7 hours are used as cathode material in lithium battery, and the initial discharge capacities are 207, 120, 203 and 181 mAh/g respectively.

关 键 词： 二氧化锰 阴离子 结构 电化学性能

领　　域： [电气工程]