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Fundamental understanding of high-capacity lithium-excess cathodes with disordered rock salt structure
- Source :
- Journal of Materials Science & Technology. 74:60-68
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- As a new class of lithium rich cathodes, disordered rock-salt cathodes have been of primary interest, because of their ability to deliver a promisingly high capacity up to 300 mA h/g. Nevertheless, some fundamental issues are yet to be fully understood and a comprehensive mastering of their solid-state chemistry, kinetics and thermal stability is required. Here, we select a high capacity cation-disordered positive electrode- Li1.2Ni0.4Nb0.4O2 as a model compound to study intrinsic reaction mechanism, including charge compensation mechanism, kinetics, thermal stability, and structural evolution. By combining soft and hard X-ray absorption spectroscopy (XAS), X-ray photoelectron spectroscopy (XPS) with operando and ex-situ differential scanning calorimetry (DSC), galvanostatic intermittent titration technique (GITT), cyclic voltammetry (CV), and X-ray diffraction (XRD), we present holistic information on disordered rock-salt cathode. This work provides beneficial insights into designing and tailoring new positive electrodes with disordered rock-salt structure.
- Subjects :
- Materials science
Polymers and Plastics
Absorption spectroscopy
chemistry.chemical_element
02 engineering and technology
010402 general chemistry
01 natural sciences
law.invention
Differential scanning calorimetry
X-ray photoelectron spectroscopy
law
Materials Chemistry
Thermal stability
X-ray absorption spectroscopy
Mechanical Engineering
Metals and Alloys
021001 nanoscience & nanotechnology
Cathode
0104 chemical sciences
Chemical engineering
chemistry
Mechanics of Materials
Ceramics and Composites
Lithium
Cyclic voltammetry
0210 nano-technology
Subjects
Details
- ISSN :
- 10050302
- Volume :
- 74
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Science & Technology
- Accession number :
- edsair.doi...........f686f4083680de9450ab4b28aaaf88dc