复合氧化物Ca_(1-x)Pb_xMnO_(3-σ)的合成及其电化学性能研究  

Studies on the Synthesis of Ca_(1-x)Pb_xMnO_(3-σ) and Its Electrochemical Performance

作　　者：夏熙[1] 李学琴[1] 

机构地区：[1]新疆大学应用化学所,乌鲁木齐830046

出　　处：《化学学报》2002年第6期985-990,共6页Acta Chimica Sinica

基　　金：国家自然科学基金 (No.2 996 30 0 2 )资助项目

摘　　要：采用共沉淀法制得Ca1 -xPbxMnO3 -σ的XRD测试结果表明该样品具有钙钛矿结构 ,利用X射线光电子能谱(XPS)对Ca0 9Pb0 1 MnO3 -σ样品中各元素的价态进行了鉴定 ,结果表明各元素分别以Ca2 +,Pb4+,Mn4+以及少量的Mn3 +的形式存在 .四探针电导率测试结果发现Ca0 9Pb0 1 MnO3 -σ的电导率比无取代CaMnO3 -σ样品的电导率提高了将近两个数量级 .并且半导体的类型发生了变化 .在碱性溶液中Ca0 9Pb0 1 MnO3 -σ表现出良好的电化学性能 ,在 9mol LKOH电解质溶液中 ,5 0mg样品采用 2mA放电至 - 0 8V时放电容量为 384mA·h g左右 .A series samples of Ca 1-xPb xMnO 3-σ have been synthesized by co-deposition method. Their structures were analyzed and characterized by X-ray diffraction (XRD) and X-ray electron spectroscopy (XPS). The results show that these samples are perovskite-type structure with Ca 2+, Pb 4+, and Mn 4+ respectively and a minor amount of Mn 3+. The conductivity value of Ca 0.9Pb 0.1MnO 3-σ is two orders of magnitude higher than that of CaMnO 3-σ and the semiconductivity-type changes from n-type for CaMnO 3-σ to p-type for Ca 0.9Pb 0.1MnO 3-σ. The discharge capacity of Ca 0.9Pb 0.1MnO 3-σ in 9 mol/L KOH solution is about 380 mA·h/g at the discharge regime - 2 mA galvanostatic to cutoff voltage of -0.8 V(vs. Hg/HgO). Cyclic voltammetry and galvanostatic charge-discharge studies show Ca 0.9 Pb 0.1MnO 3-σ has a better rechargeability than the International Common Sample (I.C.No.1) in alkaline solution. The mechanism is preliminarily discussed.

关 键 词：合成 钙钛矿型复合氧化物 Ca1-xPbxMnO3-σ 电导率 电化学性能 充放电机理 电子导电材料 共沉淀法 碱锰电池 电极材料 

分 类 号：O646[理学—物理化学]