多孔钴酸锌材料的制备及嵌锂性能  

Synthesis and lithium intercalated performance of porous zinc cobaltate

作　　者：宋雄[1,2] 汝强[1,2,3] 莫玉迪 胡社军[1,2] 安柏楠 

机构地区：[1]华南师范大学物理与电信工程学院,广东广州510006 [2]电化学储能材料与技术教育部工程研究中心,广东广州510006 [3]华南师范大学物理与电信工程学院量子信息科技实验室,广东广州510006

出　　处：《电池》2013年第6期349-352,共4页Battery Bimonthly

基　　金：国家自然科学基金(51101062);广东省自然科学基金重点项目(S2012020010937;10351063101000001);广东省教育部科技部产学研结合项目(2011A091000014);广东高校优秀青年创新人才培育项目(LYM09052);广州市科技计划项目(2011J4100075);华南师范大学学生课外科研一般课题立项课题基金(13WDGB03);华南师范大学研究生科研创新基金(2013kyjj039)

摘　　要：以草酸为络合剂，采用共沉淀法制得前驱体，再在氧气气氛中、500℃下煅烧2h，制备纳米多孔钴酸锌（ZnCo2O4）材料。XRD、SEM、透射电镜（TEN）和热重．差热分析（TG-DTA）测试结果表明：材料是由纳米颗粒（20—50nm）组成的纯相多孔ZnCo2O4，前驱体的热分解有2个明显的热失重过程。电化学性能测试结果表明：在0．01—3．00V充放电，当电流为100mA／g时，首次、第50次循环的放电比容量分别为1443．2mAh／g和1275．1mAh／g；当电流为500mA／g、1000mA／g和1500mA／g，平均放电比容量分别为1039mAh／g、854mAh／g和636mAh／g。Zinc cobaltate（ ZnCo2 04 ）material with porous nanostructure was prepared by using oxalic acid as complex agent to pre- pare precursor by co-precipitation method and calcining at 500 ℃ for 2 h in oxygen atmosphere. The test results of XRD, SEM, transmission electron microscopy（TEM） and thermal gravimetrlc-differential thermal analysis （TG-DTA） showed that the material had a high purity and a good crystallinity,composed of uniform ZnCo204 nanocrystals with a diameter of 20 ~ 50 nm. Two distinct weight loss steps were found in the TG process. The test results of electrochemical performance tests showed that when cycled in 0. 01 ~ 3.00 V and at the current of 100 mA/g,the specific discharge capacities of initial and 50th cycle were 1 443.2 mAh/g and 1 275. 1 mAh/g, respectively, at the current of 500 mA/g, 1 000 mA/g and 1 500 mA/g, the average specific discharge capacities were 1 039 mAh/g,854 mAh/g and 636 mAh/g,respeetively.

关 键 词：多孔 钴酸锌(ZnCo2O4) 锂离子电池 共沉淀 负极材料 

分 类 号：TM912.9[电气工程—电力电子与电力传动]