共沉淀法合成球形正极材料xLi_2MnO_3·(1-x)Li(Ni_(1/3)Co_(1/3)Mn_(1/3))O_2(x=0.2、0.4、0.6)及其性能研究  

Preparation and characterization of xLi_2MnO_3 ·(1-x) Li( Ni_(1/3)Co_(1/3)Mn_(1/3))O_2(x=0. 2,0. 4,0. 6) cathode materials synthesized by hydroxide co-precipitation method

作　　者：杨越[1] 徐盛明[1,2] 翁雅青[1] 黄国勇[1] 李林艳[1,2] 

机构地区：[1]清华大学核能与新能源技术研究院,北京100084 [2]清华大学精细陶瓷北京市重点实验室,北京100084

出　　处：《功能材料》2013年第19期2878-2881,2887,共5页Journal of Functional Materials

基　　金：国家自然科学基金面上资助项目(51074096);国家自然科学基金重点资助项目(50734005)

摘　　要：以氨水作为络合剂，采用氢氧化物共沉淀法合成了球形富锂锰基正极材料xLi2MnO3·（1-x）Li（Ni1／3Co1／3Mn1／3）O2（x=0．2、0．4和0．6），并对合成的不同组分样品材料的化学成分、结构、形貌和电化学性能进行了表征。结果表明，样品材料的化学组分与其理论含量相同，随着x的增大，材料的粒度变小，在电压范围为2．5～4．6V条件下进行充放电性能测试时，材料的首次充放电容量随着x值减小而增加，且当x=0．2时，材料在不同倍率条件下具有最大的放电容量。Spherical cathode materials xLi2MnO3·（1-x）Li（Ni1/3Co1/3Mn1/3）O2 （x = 0.2,0.4 and 0.6）, using ammonia as complexing agent, were synthesized by hydroxide co-precipitation method. Chemical component, structure, morphology and electrochemical performance of synthesized materials with diverse components were characterized by EDS, ICP, XRD, SEM and electrochemical performance measurement. Results show that chemical component of synthesized material was identical to its theoretical content. Increasing cr value, particle size diminishes. Testing its charge-discharge performance under voltage ranging from 2.5 to 4.6V, first charge- discharge capacity increases as a function of x value and maximum discharge capacity at different ratios was reached when cc = 0.2.

关 键 词：锂离子电池 共沉淀 正极材料xLi2MnO3·（1-x）Li（Ni1 3Co1 3Mn1 3）O2 

分 类 号：TQ152[化学工程—电化学工业]