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Constructing tri-functional modification for spinel LiNi₀.₅Mn₁.₅O₄ via fast ion conductor

Li, L; Zhao, R; Pan, D; Yi, S; Gao, L; He, G; Zhao, H; ... Bai, Y; + view all (2020) Constructing tri-functional modification for spinel LiNi₀.₅Mn₁.₅O₄ via fast ion conductor. Journal of Power Sources , 450 , Article 227677. 10.1016/j.jpowsour.2019.227677. Green open access

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Abstract

Instable surface structure and low capacity retention hinder the further application of high voltage LiNi0.5Mn1.5O4 (LNMO) cathode in lithium-ion battery. In order to promote its electrochemical performances, Li6.4La3Al0.2Zr2O12 (LLAZO) with the intrinsic property of fast ion conductivity has been employed as a protective layer to modify surface of LNMO. By regulating the LLAZO contents, 1 wt % LLAZO coated LNMO (LLAZO-1) cathode shows a high capacity of 92.1 mAh g−1 over 600 cycles with a capacity retention of 72.6% at 1 C and a reversible capacity of 57.9 mAh g−1 at 20 C, much higher than those of pristine LNMO. Further investigation indicates that the greatly improved electrochemical performances of LLAZO-1 can be attributed to the LLAZO modification, which including the LLAZO surface coating and La3+ and Zr4+ gradient co-doping. In addition, the LLAZO precursor significantly restricts the growth of LNMO precursor particles during calcination process, shorting Li+ migration pathway. Thus, modification strategy effectively improves the structure stability of LNMO, accompanied with the enhancement in lithium-ion diffusion kinetics performances and confinement in particle growth. This optimization approach with tri-functions sheds light on novel electrode design and construction in rechargeable batteries.

Type: Article
Title: Constructing tri-functional modification for spinel LiNi₀.₅Mn₁.₅O₄ via fast ion conductor
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jpowsour.2019.227677
Publisher version: https://doi.org/10.1016/j.jpowsour.2019.227677
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Lithium-ion batteries, LiNi0.5Mn1.5O4, Li6.4La3Al0.2Zr2O12, Tri-functional modification
UCL classification: UCL
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/10113386
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