A New P2-Type Layered Oxide Cathode with Extremely High Energy Density for Sodium-Ion Batteries
- Title
- A New P2-Type Layered Oxide Cathode with Extremely High Energy Density for Sodium-Ion Batteries
- Author
- 황장연
- Keywords
- high-capacity; high energy density; high-rate; P2-type cathodes; sodium-ion batteries
- Issue Date
- 2019-04
- Publisher
- WILEY-V C H VERLAG GMBH
- Citation
- ADVANCED ENERGY MATERIALS, v. 9, NO 15, no. 1803346
- Abstract
- Herein, a new P2-type layered oxide is proposed as an outstanding intercalation cathode material for high energy density sodium-ion batteries (SIBs). On the basis of the stoichiometry of sodium and transition metals, the P2-type Na-0.55[Ni0.1Fe0.1Mn0.8]O-2 cathode is synthesized without impurities phase by partially substituting Ni and Fe into the Mn sites. The partial substitution results in a smoothing of the electrochemical charge/discharge profiles and thus greatly improves the battery performance. The P2-type Na-0.55[Ni0.1Fe0.1Mn0.8]O-2 cathode delivers an extremely high discharge capacity of 221.5 mAh g(-1) with a high average potential of approximate to 2.9 V (vs Na/Na+) for SIBs. In addition, the fast Na-ion transport in the P2-type Na-0.55[Ni0.1Fe0.1Mn0.8]O-2 cathode structure enables good power capability with an extremely high current density of 2400 mA g(-1) (full charge/discharge in 12 min) and long-term cycling stability with approximate to 80% capacity retention after 500 cycles at 600 mA g(-1). A combination of electrochemical profiles, in operando synchrotron X-ray diffraction analysis, and first-principles calculations are used to understand the overall Na storage mechanism of P2-type Na-0.55[Ni0.1Fe0.1Mn0.8]O-2.
- URI
- https://onlinelibrary.wiley.com/doi/full/10.1002/aenm.201803346https://repository.hanyang.ac.kr/handle/20.500.11754/111015
- ISSN
- 1614-6832; 1614-6840
- DOI
- 10.1002/aenm.201803346
- Appears in Collections:
- CENTER FOR CREATIVE CONVERGENCE EDUCATION[S](창의융합교육원) > ETC
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