Suppressed Lattice Oxygen Release via Ni/Mn Doping from Spent LiNi<sub>0.5</sub>Mn<sub>0.3</sub>Co<sub>0.2</sub>O<sub>2</sub> toward High-Energy Layered-Oxide Cathodes.
basic_science · Level V
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- Record sourced from PubMed, PMID 36149367.
- Also identified by DOI 10.1021/acs.nanolett.2c03090.
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Abstract
LiCoO<sub>2</sub> has suffered from poor stability under high voltage as a result of insufficient Co-O bonding that causes lattice oxygen release and lattice distortions. Herein, we fabricated a high-voltage LiCoO<sub>2</sub> at 4.6 V by doping with Ni/Mn atoms, which are obtained from spent LiNi<sub>0.5</sub>Mn<sub>0.3</sub>Co<sub>0.2</sub>O<sub>2</sub> cathode materials. The as-prepared high-voltage LiCoO<sub>2</sub> with Ni/Mn substitutional dopants in the Co layer enhances Co-O bonding that suppresses oxygen release and harmful phase transformation during delithiation, thus stabilizing the layered structure and leading to a superior electrochemical performance at 4.6 V. The pouch cell of modified LiCoO<sub>2</sub> exhibits a capacity retention of 85.1% over 100 cycles at 4.5 V (vs graphite). We found that our strategy is applicable for degraded LiCoO<sub>2</sub>, and the regenerated LiCoO<sub>2</sub> using this strategy exhibits excellent capacity retention (84.1%, 100 cycles) at 4.6 V. Our strategy paves the way for the direct conversion of spent batteries into high-energy-density batteries.