摘要
对Me2+(Me=Ni,Co,Mn)-NH3-OH--H2O共沉淀反应体系进行了热力学分析,采用共沉淀法合成了LiNi1/3Co1/3Mn1/3O2正极材料前驱体Ni1/3Co1/3Mn1/3(OH)2,研究了pH值和氨水浓度[N]对前驱体振实密度的影响.热力学分析表明:以氢氧化钠为沉淀剂、氨水为络合剂,采用共沉淀法合成前驱体的最佳pH值为11,最佳[N]为0.1～0.5mol/L;在此条件下,金属阳离子Ni2+、Co2+和Mn2+的损失最小,分别小于1×10-3、1×10-3和1×10-6mol/L.在pH=11、[N]=0.24mol/L条件下,所合成的前驱体中Ni、Co、Mn的摩尔比为0.324∶0.349∶0.327,与理论设计值1∶1∶1非常接近,其振实密度高达1.32g/cm3.
The thermodynamic analysis of Me^2＋-NH3-OH^--H2O（Me=Ni,Co,Mn） coprecipitation system was carried out,and the precursor Ni1/3Co1/3Mn1/3（OH）2 for cathode material LiNi1/3Co1/3Mn1/3O2 was synthesized via a coprecipitation method,with NaOH as the precipitant and NH3·H2O as the complexing agent.The thermodynamic analysis shows that the optimal conditions are pH value of 11 and ammonia concentration 0.1～0.5mol/L,and the loss of Ni^2＋,Co^2＋ and Mn^2＋ reaches the minimum,that is,1×10^-3,1×10^-3 and 1×10^-6mol/L,respectively.The molar ratio of Ni/Co/Mn in the synthesized precursor is 0.324∶0.349∶0.327,which approximates the desired 1∶1∶1,and the tap density of the synthesized precursor is up to 1.32g/cm^3 when pH value is 11 and an ammonia concentration is 0.24mol/L.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第4期30-34,44,共6页
Journal of South China University of Technology(Natural Science Edition)
基金
广东省科技攻关项目(2008B010800031)
关键词
锂离子电池
正极材料
前驱体
共沉淀法
热力学分析
lithium-ion battery
cathode material
precursor
coprecipitation method
thermodynamic analysis
