中文摘要：

用共沉淀法合成了Li Ni0.5Mn0.5O2材料.为了探索共沉淀法合成Li Ni0.5Mn0.5O2的最佳工艺,详细研究了研磨时间、pH值、预处理温度、煅烧温度、煅烧时间和冷却方式等对材料结构的影响.以氢氧化锂为锂源,Ni（NO3）2.6 H2O和Mn（Ac）2.4 H2O为镍源和锰源,锂与镍、锰物质的量比为1.1∶0.5∶0.5,经强氧化剂处理,900℃下煅烧12 h后经淬冷制备了Li Ni0.5Mn0.5O2样品.采用XRD,Raman和XPS对该样品进行了分析,结果表明：材料为标准的α-NaFeO2层状结构,属于六方晶系;镍以正二价的形式存在,锰主要以正四价存在,非常接近理论计算的理想结构.

英文摘要：

The LiNi_0.5Mn_0.5O_2 materials were synthesized by co-precipitation method.In order to explore the best path of synthesis the LiNi_0.5Mn_0.5O_2 with co-precipitation,we studied detailedly the grinding time,pH,pretreatment,calcination temperature,calcination time and the cooling methods.Experimental results show that lithium hydroxide is a lithium source,Ni（NO_3）_2·6H_2O and Mn（Ac）_2·4H_2O is the source for the nickel and manganese sources,so lithium and nickel,manganese molar ratio is 1.1∶0.5∶0.5.After strong oxidant treatment,900℃ calcined 12 h,and quenching,the LiNi0.5Mn0.5O2 materials were prepared,the samples structure were the standard α-NaFeO2 layered structure and belongs to hexagonal system by XRD and Raman spectroscopy testing.XPS analysis showed that the nickel was divalent,the manganese is tetravalent.This is very close to the theoretical calculation of the ideal structure.