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Combinatorial Performance Mapping of Near-NMC111 Li-ion Cathodes

Commandeur, D; Sabado, C; Ashton, TE; Darr, JA; (2021) Combinatorial Performance Mapping of Near-NMC111 Li-ion Cathodes. Journal of Materiomics 10.1016/j.jmat.2021.07.003. (In press). Green open access

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Abstract

A combinatorial library of twenty-three, phase pure, near-NMC111 (LiNi0·33Mn0·33Co0·33O2) compositions were synthesised and their electrochemical performance, was mapped (in lithium ion half-cells). Each of the 23 compositions was made in series, using a two-step process of 1) a rapid initial continuous hydrothermal precipitation, followed by 2) solid state lithiation. The 23 lithiated NMC samples were then subjected to analytical methods including electron microscopy (selected samples), Powder X-ray Diffraction and electrochemical tests in half cell Li-ion configurations versus Li metal. A sample with a Ni:Mn:Co (NMC) ratio of 39:28:33, revealed a specific capacity of 150 mA h g−1 at a C/20 rate, which was 63 and 43% greater capacity than NMC111 and NMC433 samples produced in this work, respectively. The sample with NMC ratio 47:25:28, showed the best capacity retention characteristics, retaining 70% of its C/20 capacity at 1C, after 40 cycles. Further analysis of all the samples by cyclic voltammetry and electrochemical impedance spectroscopy, allowed compositional mapping of diffusion coefficients. Overall, the mapping data revealed a gradual change of properties across compositional space, which has validated our combinatorial approach and allowed identification of the optimum performing near-NMC111 cathode materials.

Type: Article
Title: Combinatorial Performance Mapping of Near-NMC111 Li-ion Cathodes
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jmat.2021.07.003
Publisher version: https://doi.org/10.1016/j.jmat.2021.07.003
Language: English
Additional information: Copyright © 2021 The Chinese Ceramic Society. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Keywords: Li-ion Batteries, Li-ion Cathode, NMC, Combinatorial, Continuous hydrothermal flow synthesis, Rate capability
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.ucl.ac.uk/id/eprint/10133053
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