Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (4): 30-34,44.doi: 10.3969/j.issn.1000-565X.2010.04.006

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Thermodynamic Analysis of Synthesis of Ni 1/3 Co 1/3 Mn 1/3（OH）2 via Coprecipitation

Xiao Xin-yan  Ye Yong-qing   

  1. School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2009-06-22 Revised:2009-09-07 Online:2010-04-25 Published:2010-04-25
  • Contact: 肖新颜（1964-），男，博士，教授，主要从事精细化学工程、环境化工等研究． E-mail:cexyxiao@scut．edu．cn
  • About author:肖新颜（1964-），男，博士，教授，主要从事精细化学工程、环境化工等研究．
  • Supported by:

    广东省科技攻关项目（2008B010800031）

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Abstract:

The thermodynamic analysis of Me 2＋-NH3-OH--H2O（Me=Ni,Co,Mn） coprecipitation system was carried out,and the precursor Ni 1/3 Co 1/3 Mn 1/3（OH）2, for cathode material LiNi 1/3 Co 1/3 Mn 1/3 O2 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 -6 mol/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/cm3 when pH value is 11 and an ammonia concentration is 0.24mol/L.

Key words: lithium-ion battery, cathode material, precursor, coprecipitation method, thermodynamic analysis