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| Chemical Reaction Mechanism of LiCoO2 Roasting in SO3 Atmosphere |
| Received:November 28, 2016 Revised:December 02, 2016 |
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| DOI：doi：10.3969/j.issn.1007-7545.2017.04.001 |
| KeyWord:spent Li-ion battery; LiCoO2; SO3 atmosphere; gas-solid reaction; reaction mechanism |
| Author | Institution |
| wangdahui |
兰州理工大学 |
| lianghongyan |
兰州理工大学 |
| chenhuaijing |
兰州理工大学 |
| yangyujiao |
兰州理工大学 |
| sunjianyong |
兰州理工大学 |
| wanghongwei |
兰州理工大学 |
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| Abstract: |
| A new technique was applied to recycle LiCoO2 from spent Li-ion batteries. LiCoO2 reacted with SO3 in closed container. Controlled speed link of SO3-LiCoO2 reaction was found with Model Fitting Method. Phase transformation of product was analyzed by XRD and chemical reaction mechanism of LiCoO2 roasting in SO3 atmosphere was discussed. The results show that temperature is the key factor. SO3-LiCoO2 reaction was controlled by inner diffusion with apparent activation energy of 51.04 kJ/mol. The products include Li2SO4, Co3O4, and Li2Co(SO4)2, without CoSO4. Transformation process of Li is Li2O→Li2SO4→Li2Co(SO4)2, and that of Co is CoO2→Co3O4→Li2Co(SO4)2. The transformation process of Co3O4→Li2Co(SO4)2 is the limited step in whole reaction. |
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