Ashton, TE;
Baker, PJ;
Sotelo-Vazquez, C;
Footer, CJM;
Kojima, KM;
Matsukawa, T;
Kamiyama, T;
(2021)
Stoichiometrically driven disorder and local diffusion in NMC cathodes.
Journal of Materials Chemistry A
, 9
(16)
pp. 10477-10486.
10.1039/d1ta01639c.
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Abstract
Major structural differences in lithium nickel manganese cobalt oxides (NMC) prepared under identical conditions have been uncovered using neutron powder diffraction. Sample NMC-622 was obtained as a single R[3 with combining macron]m crystal structure with little defects, whereas NMC-811 showed significant Li deficiency and NMC-433 formed three distinct phases; ordered R[3 with combining macron]m, disordered R[3 with combining macron]m and a C2/m phase. Local diffusion behaviour was also studied by muon spin relaxation (μSR). It was observed that single phase R[3 with combining macron]m NMC-622 showed a higher lithium diffusion coefficient (4.4 × 10−11 cm2 s−1) compared to lithium deficient NMC-811 (2.9 × 10−11 cm2 s−1), or the highly disordered NMC-433 (3.4 × 10−11 cm2 s−1). Furthermore, activation energies for the Li diffusion process were estimated to be 58 meV, 61 meV and 28 meV for NMC-811, NMC-622 and NMC-433, respectively.
| Type: | Article |
|---|---|
| Title: | Stoichiometrically driven disorder and local diffusion in NMC cathodes |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1039/d1ta01639c |
| Publisher version: | https://doi.org/10.1039/d1ta01639c |
| Language: | English |
| Additional information: | This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (http://creativecommons.org/licenses/by/3.0/). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10127609 |
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