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.
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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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