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Stable heteroepitaxial interface of Li-rich layered oxide cathodes with enhanced lithium storage
- Source :
- Energy Storage Materials. 21:69-76
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Lithium and oxygen activities can have substantial influences on the kinetics of ion and electron transport and the structural integrity of Li-rich layered oxide (LLO) cathodes, since reversible oxygen redox is ascribed to the extra capacity beyond the theoretical capacity from transition metal redox at high voltages. Herein, we demonstrate a liquid-solid interfacial reaction to generate a heteroepitaxial interface with tunable Li/O activities on LLOs using molten boric acid. The experimental and theoretical analyses indicate that the atomic scale interface is comprised of a disordered rock salt structure containing substantial Li/O vacancies along the layered structure, associated with a segregation tendency of Ni and Co. The formation of this heteroepitaxial interface with Li/O vacancies improves the ionic/electronic conduction and electrochemical/structural stability, leading to a high discharge capacity of 283 mA h g-1 with initial Coulombic efficiency of 91.7% (0.1 C, 2.0–4.7 V vs. Li+/Li), excellent rate performance (246 and 159.7 mAh g-1 at 1 C and 10 C, respectively) and enhanced cyclic performance with a capacity retention of 92% after 100 cycles. The findings highlight the importance of a well-engineered interface for the design of high performance layered cathode materials for Li storage.
- Subjects :
- Materials science
Renewable Energy, Sustainability and the Environment
Oxide
Energy Engineering and Power Technology
Ionic bonding
chemistry.chemical_element
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Electrochemistry
01 natural sciences
Redox
Cathode
0104 chemical sciences
law.invention
chemistry.chemical_compound
Chemical engineering
chemistry
Transition metal
law
General Materials Science
Lithium
0210 nano-technology
Faraday efficiency
Subjects
Details
- ISSN :
- 24058297
- Volume :
- 21
- Database :
- OpenAIRE
- Journal :
- Energy Storage Materials
- Accession number :
- edsair.doi...........01642a319b66b90e14e263b84e695189