微通道反应器共沉淀法制备钴掺杂一氧化锰及其储锂性能  

Preparation and lithium storage properties of Co-doped MnO by co-precipitation method in micro-channel reactor

作　　者：杨洋 何亮 张亚男 龙云飞[1] 苏静[1,3,4] 文衍宣 Yang Yang;He Liang;Zhang Yanan;Long Yunfei;Su Jing;Wen Yanxuan(School of Chemistry and Chemical Engineering,Guangxi University,Nanning,Guangxi 530004,China;Guangxi Key Laboratory of Processing for Non-Ferrous Metallic and Featured Materials;Guangxi Novel Battery Materials Research Center of Engineering Technology;Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology)

机构地区：[1]广西大学化学化工学院,广西南宁530004 [2]广西有色金属及特色材料加工重点实验室 [3]广西新型电池材料工程技术研究中心 [4]广西高校新能源材料及相关技术重点实验室

出　　处：《无机盐工业》2019年第12期10-14,共5页Inorganic Chemicals Industry

基　　金：国家自然科学基金[喷雾干燥构筑三维多孔导电骨架/MnC2O4复合微球及其储锂性能(51864005);T型微反应器共沉淀法制备锂离子电池多孔MnO/C微球负极材料(51564002)];广西自然科学基金[锂离子电池负极材料MnC4O4多孔纳米导电框架结构的构筑与性能研究(2018GXNSFDA281014)]

摘　　要：以乙酸锰、乙酸钴、草酸为原料,采用微通道反应器共沉淀法合成了花朵状的钴掺杂氧化锰(Mn1-xCoxO)锂离子电池负极材料。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)对电极材料的结构、形貌和元素状态进行了表征。采用恒流充放电测试和电化学工作站研究了钴不同掺杂量对一氧化锰负极材料电化学性能的影响。研究发现,随着钴掺杂量逐渐增加,Mn1-xCoxO由棒状演变为花朵状结构,比容量随着钴掺杂量增加先增加后下降。合成的Mn0.95Co0.05O在5C倍率下循环200次后放电比容量为496.7 mA·h/g,与未掺杂的一氧化锰相比其比容量提高约40.0%,显示出较好的电化学性能。Flower-like Co-doped manganese oxide(Mn1-xCoxO)lithium ion battery anode material was synthesized by coprecipitation method in the micro-channel reactor,using Mn(CH3COO)2·4H2O,Co(CH3COO)2·4H2O and C2H2O4·2H2O as raw materials.X-ray diffraction(XRD),scan electron microscopy(SEM)and X-ray photoelectron spectroscopy(XPS)were used to characterize the structure,morphology and elemental state of Mn1-xCoxO electrodes.Galvanostatic charge-discharge test and electrochemical workstation were carried out to investigate the effect of Co-doping amount on electrochemical performance of Mn1-xCoxO as an anode material for lithium ion batteries.When the amount of Co-doping increased,Mn1-xCoxO and its precursor all evolved from rod-like to flower-like,and the capacity first increased and then decreased.As-synthesized Mn0.95Co0.05O delivered a discharge capacity of 496.7 mA·h/g after 200 cycles at 5C rate,and its discharge specific capacity was increased by about 40.0%compared with undoped MnO,which showed good electrochemical performance.

关 键 词：钴掺杂一氧化锰 微通道反应器共沉淀法 锂离子电池负极材料 

分 类 号：TQ137.12[化学工程—无机化工]