以山茶花瓣为模板合成多孔片层结构MnO_2及其电化学性能  

Preparation and Electrochemical Properties of Lamellar Porous MnO_2 Synthesized by Using Camellia Petal as Biotemplates

作　　者：王赛[1] 许松松[1] 吴正颖[1] 叶朋[1] 陈丰[1] 刘成宝[1] 李萍[1] 陈志刚(指导)[1] 

机构地区：[1]苏州科技学院化学生物与材料工程学院,江苏省环境功能材料重点实验室,苏州215009

出　　处：《机械工程材料》2016年第3期43-48,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(21103119,21277094,21407111);江苏省高校自然科学研究面上项目(11KJB430012);教育部留学回国人员科研启动经费资助项目([2013]693);江苏省环境功能材料重点实验室开放课题项目(SJHG1310);江苏省高校研究生科研创新计划项目(CXZZ13_0855)

摘　　要：以山茶花瓣为模板,以0.01,0.03,0.05,0.10mol·L-1 MnNO_3溶液为前驱体,采用浸渍煅烧的方法合成了具有山茶花瓣微观形貌的多孔片层状MnO_2,并对它的结构和形貌进行了表征;然后将MnO2作为负极材料安装成扣式锂离子电池,测定了MnO_2的电化学特性。结果表明:合成的MnO_2中均含有α、β和ε晶型的MnO_2;随着前驱体溶液浓度由0.01mol·L-1增至0.10mol·L-1,制备的MnO_2的比表面积由8.81cm2·g^(-1)增至39.82cm^2·g^(-1),孔容由0.08cm^3·g^(-1)增至0.26cm^3·g^(-1);电池的首次库伦效率均大于22.56%,经过10次循环后的可逆容量仍能保持70mAh·g^(-1)。The biomorphic MnO_2 materials with lamellar porous structure were successfully synthesized by using camellia petal as biotemplate and MnNO3 solution of 0.01,0.03,0.05,0.10 mol·L^-1 as precursor.Their structure and morphology were characterized.And then lithium-ion battery was assembled by using MnO_2 as negative electrode material,the electrochemical properties of MnO_2 was tested.Results show that all MnO_2containedα,βandεform MnO_2 crystals.The specific surface area and pore volume of MnO_2 respectively increased from 8.81cm^2·g^-1 to 39.82cm^2·g^-1 and from 0.08cm^3·g^-1 to 0.26cm^3·g^-1 with the concentration of precursor solution increased from 0.01mol·L-1 to 0.10mol·L^-1.In addition,the first coulombic efficiency of lithium-ion battery was more than 22.56%,and the reversible capacity of the battery could still maintain 70mAh·g^-1 after 10 cycles.

关 键 词：山茶花瓣 二氧化锰 多孔结构 生物模板 锂离子电池 电化学性能 

分 类 号：TB34[一般工业技术—材料科学与工程]