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Controlling Residual Lithium in High-Nickel (>90 %) Lithium Layered Oxides for Cathodes in Lithium-Ion Batteries.
- Source :
-
Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2020 Oct 12; Vol. 59 (42), pp. 18662-18669. Date of Electronic Publication: 2020 Aug 31. - Publication Year :
- 2020
-
Abstract
- The rampant generation of lithium hydroxide and carbonate impurities, commonly known as residual lithium, is a practical obstacle to the mass-scale synthesis and handling of high-nickel (>90 %) layered oxides and their use as high-energy-density cathodes for lithium-ion batteries. Herein, we suggest a simple in situ method to control the residual lithium chemistry of a high-nickel lithium layered oxide, Li(Ni <subscript>0.91</subscript> Co <subscript>0.06</subscript> Mn <subscript>0.03</subscript> )O <subscript>2</subscript> (NCM9163), with minimal side effects. Based on thermodynamic considerations of the preferred reactions, we systematically designed a synthesis process that preemptively converts residual Li <subscript>2</subscript> O (the origin of LiOH and Li <subscript>2</subscript> CO <subscript>3</subscript> ) into a more stable compound by injecting reactive SO <subscript>2</subscript> gas. The preformed lithium sulfate thin film significantly suppresses the generation of LiOH and Li <subscript>2</subscript> CO <subscript>3</subscript> during both synthesis and storage, thereby mitigating slurry gelation and gas evolution and improving the cycle stability.<br /> (© 2020 Wiley-VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1521-3773
- Volume :
- 59
- Issue :
- 42
- Database :
- MEDLINE
- Journal :
- Angewandte Chemie (International ed. in English)
- Publication Type :
- Academic Journal
- Accession number :
- 32668043
- Full Text :
- https://doi.org/10.1002/anie.202007436