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Citation: GUO Li-Ping, DU Xiao-Di, FANG Wei, LEI Jia-Heng. Reduction and Dissolution of LiCoO₂ by Na₂S₂O₃ and Separation and Recovery of Li and Co[J]. Chinese Journal of Applied Chemistry, ;2006, 23(10): 1182-1184. shu

Reduction and Dissolution of LiCoO₂ by Na₂S₂O₃ and Separation and Recovery of Li and Co

1.
School of Science, Department of Applied chemistry, Wuhan University of Technology, Wuhan 430070

Corresponding author: LEI Jia-Heng,
Received Date: 29 October 2005
Available Online: 26 December 2005
Fund Project: 湖北省自然科学基金资助项目(2002AB074) (2002AB074)

The process of reducing and dissolving LiCoO₂ in the lithium-ion battery by Na₂S₂O₃ in the presence of H₂SO₄ was studied.It had high reaction rate and LiCoO₂ dissolved completely with no contamination.The solubility rate of LiCoO₂ was 99.5%.The optimal process conditions are that the concentration of H⁺ is 3.5 mol/L,the concentration of Na₂S₂O₃ is 0.25 mol/L,reaction temperature is 90℃,reaction time is 2.3 h.Fe and Al in the system were removed by precipitation at pH≈5.Co(OH)₂ was obtained by preci-pitation at pH=9.5~10,it was then purified by reprecipitation.Co₃O₄ was obtained by calcining Co(OH)₂ at 500℃ for 2 h,the purity of which was 99.3%.The recovery rate of Co was 97%.Li₂CO₃ was obtained by adding Na₂CO₃ to the mother liquor,the purity of which was 97.8%.The one-time recovery for Li was 73%.The mother liquor can be reused after being cooled to below 10℃ and Na₂SO₄·10H₂O is recovered.
- Li-ion battery,
- LiCoO₂,
- Na₂S₂O₃,
- recover,
- Li,
- Co
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Reduction and Dissolution of LiCoO₂ by Na₂S₂O₃ and Separation and Recovery of Li and Co