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One-pot compositional and structural regeneration of degraded LiCoO2 for directly reusing it as a high-performance lithium-ion battery cathode.
- Source :
- Green Chemistry; 10/7/2020, Vol. 22 Issue 19, p6489-6496, 8p
- Publication Year :
- 2020
-
Abstract
- Recycling spent cathodes from Li-ion batteries (LIBs) is an appealing route to address environmental issues and resource shortage, but is plagued by effective and simple recycling techniques. Current recycling technologies generally involve multi-steps such as acid leaching, precipitation, smelting, or solid-state sintering, and obtained products possess inferior electrochemical properties. The current work explores a new regeneration method for failed LiCoO<subscript>2</subscript> cathode material. The electrochemical performance of LiCoO<subscript>2</subscript> is fully recovered through a single thermal-chemical treatment of spent LiCoO<subscript>2</subscript> in molten LiOH–KOH–Li<subscript>2</subscript>CO<subscript>3</subscript> under air atmosphere. The molten salt mixture presents suitable dissolving capacity, homogeneous thermal circumstance, abundant Li<superscript>+</superscript>, and high ion diffusion rate to decompose impurities, compensate for Li<superscript>+</superscript> deficiency, and repair damaged structure through a "dissolution-recrystallization" mechanism. Under the optimized reaction temperature of 500 °C, the regenerated LiCoO<subscript>2</subscript> possessed similar stoichiometric composition and crystalline structure of commercial LiCoO<subscript>2</subscript>. Importantly, the discharge capacity of spent LiCoO<subscript>2</subscript> was recovered from 68.3 mA h g<superscript>−1</superscript> to 144.5 mA h g<superscript>−1</superscript>, reaching the original level of commercial LiCoO<subscript>2</subscript>. Besides, the regenerated LiCoO<subscript>2</subscript> also delivered superior cycling of 92.5% capacity retention after 200 cycles and excellent rate performance. This work presents an effective and extendable approach to regenerate spent cathode materials to retrieve their electrochemical performance. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14639262
- Volume :
- 22
- Issue :
- 19
- Database :
- Complementary Index
- Journal :
- Green Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 146217256
- Full Text :
- https://doi.org/10.1039/d0gc02662j