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Journal Article
Enhanced Fast-Discharging Performance and Cyclability in Oxygen-Redox-Based P3-Type Na-Layered Cathode via Vacancies in TM layers
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- Authors
- Sang-Yeop Lee, Hyunji Kweon, Sangyeop Lee, Min-kyung Cho, Hobin Ahn, Jinho Ahn, Bonyoung Ku, Myungeun Choi, Hun-Gi Jung, Dong Ok Shin, Jongsoon Kim
- Issue Date
- 2024-11
- Citation
- Advanced Energy Materials, v.14, no.42, pp.1-13
- ISSN
- 1614-6832
- Publisher
- Wiley-VCH Verlag
- Language
- English
- Type
- Journal Article
- Abstract
- Oxygen redox in layered oxide cathodes for Na-ion batteries is considered a promising approach for improving the energy density. However, oxygen-redox-based cathodes suffer from sluggish kinetics and undesirable structural change during charge/discharge, leading to poor electrochemical performances. Herein, introducing vacancies (□) in the transition metal layers enables the enhanced oxygen redox-based electrochemical performances in the P3-type Mn-based layered oxide cathode is demonstrated. The vacancies can play a role of the local distortion buffers, resulting in the enhanced oxygen redox kinetics and the suppressed structural deformation such as P3-O3(II) phase transition. The oxygen-redox-based P3-type Na0.56[Ni0.1Mn0.81□0.09]O2 exhibits the large discharge capacity of ≈140.95 mAh g−1 at 26 mA g−1 with a high average discharge voltage of ≈3.54 V (vs Na+/Na). Even at 650 mA g−1, its discharge capacity and average operation voltages delivered ≈122.06 mAh g−1 and ≈3.22 V, respectively. Especially, the small gap of average discharge voltage indicates both improves power-capability and enhanced kinetics of oxygen redox in P3-type Na0.56[Ni0.1Mn0.81□0.09]O2. Moreover, the vacancy buffer in the transition metal layers results in the stable cycle-performance of P3-type Na0.56[Ni0.1Mn0.81□0.09]O2 with the capacity retention of ≈80.80% for 100 cycles, due to the suppressed P3-O3(II) phase transition.
- KSP Keywords
- Average discharge, Discharge voltage, Discharging performance, Electrochemical performance, Energy Density, Enhanced kinetics, Layered cathode, Local distortions, Mn-based, Na-ion batteries, Phase transition