高性能锂离子电池负极材料MoO3-x的制备与性能研究  

Preparation of MoO3-x as high-performance anode material for lithium-ion battery and study on its property

作　　者：李春晓 丘德立 陈东 刘汗青 李学良 LI Chun-xiao;QIU De-li;CHEN Dong;LIU Han-qing;LI Xue-liang(School of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei 230000,China)

机构地区：[1]合肥工业大学化学与化工学院

出　　处：《现代化工》2019年第12期76-80,共5页Modern Chemical Industry

基　　金：国家自然科学基金(21571047)

摘　　要：以三氧化钼、二水合草酸为原料,通过简单的溶剂热法制备了MoO3-x锂离子电池负极材料。采用XRD、TG、SEM、HR-TEM等方法对MoO3-x样品的化学组成、结构与形貌进行了表征,并对MoO3-x进行电化学性能测试。结果表明,该材料呈现花状结构,形貌均一,具有氧缺陷结构。MoO3-x作为负极材料应用于锂离子电池时展示出极好的电化学性能:在电流密度为2 A/g的条件下,该材料的首圈充/放电比容量分别达到978.6 mAh/g和1760 mAh/g。具有良好的循环稳定性;在5 A/g的条件下进行测试时,稳定循环1000圈后,可逆放电比容量仍旧保持在490 mAh/g。MoO3-x cathode materials are synthesized via a simple solvothermal method,with molybdenum trioxide and oxalic acid dihydrate as raw materials.XRD,TG,SEM,HR-TEM and other methods are used to study the chemical composition,structure and morphology of the sample,and the electrochemical performance of the sample is tested also.Based on the results,the flower-like MoO3-x,which possesses oxygen vacancies structure,has a uniform morphology.The oxygen vacancies results in a large interlayer spacing that enhance faster charge storage kinetics.Moreover,it can maintain the structure stabilities during the process of insertion and removal of Li ions.And flower-like structure of the sample can accommodate the volume expansion during long cycle.Herein,MoO3-x as anode materials for lithium ion battery displays excellent electrochemical performance with good rate capability,long cycling life and high reversible discharge capacity.Under a current density of 2 A·g-1,the first cycle specific charge and discharge capacities of the material is 978.6 mAh·g-1 and 1,760 mAh·g-1 respectively.Under a current density of 5 A·g-1,its reversible discharge specific capacity maintains at 490 mAh·g-1 after 1000 cycles of stable circulation.

关 键 词：氧缺陷 MoO3-x 负极材料 体积膨胀 

分 类 号：R155[医药卫生—营养与食品卫生学]