层状正极材料Li[Co_(1/3)Ni_(1/3)Mn_(1/3)]O_2的合成及电化学性能表征

Research on Preparing Kinetics and Electrochemical Characterization of Layered Li[Co1/3Ni1/3Mn1/3]O2 Cathode Material

中文关键词:  锂电池  正极材料  TG/DSC  XRD  循环伏安法

英文关键词:TG/DSC  XRD

中文摘要:

      以Co(NO3)2.6H2O、Ni(CH3COO)2.4H2O和Mn(CH3COO)2.4H2O为原料,在氩气保护下用共沉淀法制备了分散均匀的前驱体[Co1/3Ni1/3Mn1/3]C2O4.xH2O,用TG/DSC对前驱体的热分解做了表征。前驱体与碳酸锂在乙醇-水的混合体系中均匀分散,50℃下真空干燥后于500℃下预烧,将得到的混合物压片,然后在空气中于700~1 000℃下煅烧12~24 h得到三元正极材料。将得到的样品进行XRD、电池充放电循环、循环伏安等表征和测试。结果表明,700~1 000℃合成的样品有好的晶型(六方晶系,α-NaFeO2),特别是900℃下合成的正极材料有较好的晶型、高的首次充放电容量,并具有良好的电化学性能。

英文摘要:

      Co(NO3)2·6H2O,Ni(CH3COO)2·4H2O and Mn(CH3COO)2·H2O were selected as the starting materials to synthesize the homogeneous transition-metal oxalate [Co1/3Ni1/3Mn1/3]C2O4·xH2O by co-precipitation method under the propection of argon atmosphere.TG/DSC analysis was used to confirm precursor thermal decomposition process.The mixture of precursor and lithium carbonate mixed in ethanol/water system was dried at 50 ℃ in vacuum dryer,and then presintered at 500 ℃ for 6h.After cooled to ambient,the mixture was pressed...