锰基锂正极材料Li_(1.2)Ni_(0.13)Co_(0.13)Mn_(0.54)O_2的制备与电化学特性研究

Study on preparation and electrochemical character of Mn-base lithium anode material Li_(1.2)Ni_(0.13)Co_(0.13)Mn_(0.54)O_2

对掺杂镍(Ni)和钴(Co)固体物质锰基锂正极材料进行研究,采用高温固相合成法制得锰基锂正极材料Li_(1.2)Ni_(0.13)Co_(0.13)Mn_(0.54)O_2,采用X射线衍射仪分析该合成材料在不同恒定温度煅烧下的晶体结构和材料表征,采用高精度电池测试仪测试电池的电化学特性。测试结果表明,锰基锂正极材料Li_(1.2)Ni_(0.13)Co_(0.13)Mn_(0.54)O_2为六方晶系,α-NaFeO2结构,R3m空间群,结晶程度极高,结构稳定性很好。锰基锂正极材料Li_(1.2)Ni_(0.13)Co_(0.13)Mn_(0.54)O_2的充电平台和放电平台分别为4.2V和3.2V,在0.1C倍率下,充电比容量高达约370mAh/g,放电比容量高达约325mAh/g,在不同倍率下经过10次循环后其比容量保持稳定。

Mn-base lithium anode material doped Ni and Co solid material was studied.Using high temperature synthesis method,Mn-base lithium anode material Li1.2Ni0.13Co0.13Mn0.54O2 was prepared.The crystal structure of sample and material characterization was analyzed and collected through X-ray diffractometry（XRD）under the calcination of different constant temperature.The electrochemical character of charge-discharge were showed by high precision electrical tester.Testing results showed that Li1.2Ni0.13Co0.13Mn0.54O2 was hexagonal system,crystal structure was space group of R3 mand the cubic crystal structure.Li1.2Ni0.13Co0.13Mn0.54O2 of constant temperature of 900℃calcination synthesis was high degree of crystallization and its structure stability was very good.Electrical characteristics tests indicated that there were two charge-discharge platforms and between 3.45 Vand 4.8Vin the the battery of Mn-base lithium anode material Li1.2Ni0.13Co0.13Mn0.54O2.The charge and discharge specific capacity was up to more than 300mAh/g,and after 10 cycles in different ratio in the specific storage stability between 0.1Cand 0.2Cratio.