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Understanding improved stability of Co-free Ni-rich single crystal cathode materials by combined bulk and surface modifications.
- Source :
-
Materials Today . May2024, Vol. 74, p22-33. 12p. - Publication Year :
- 2024
-
Abstract
- [Display omitted] Co-free Ni-rich single crystal LiNi x Mn 1-x O 2 (x ≥ 0.6) (denoted as SCNM) have been actively studied as a candidate cathode for high energy density and low-cost lithium-ion batteries (LIBs). However, their practical use in LIBs is significantly hindered by their poor chemo-mechanical stability and short cycle life. Herein, we show much improved structural stability and cycle life by bulk and surface modifications of SCNM. We show strong evidence that bulk Ti-doping and gradient Nb-doping are effective in stabilizing lattice oxygen and suppressing detrimental phase transformations, while LiTi 2-x Nb x (PO 4) 3 (LTNP) surface coating protects SCNM from reacting with liquid electrolyte and promotes formation of thin and robust interphase layers. As a result, LTNP-modified SCNM achieves an excellent electrochemical performance with 87.2% capacity retention after 100 cycles at high voltage of 4.4 V. This work demonstrates a new approach to stabilize lattice oxygen of Co-free and Ni-rich cathodes and their interfaces with liquid electrolytes, thus contributing to the development of high-energy–density LIBs. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13697021
- Volume :
- 74
- Database :
- Academic Search Index
- Journal :
- Materials Today
- Publication Type :
- Academic Journal
- Accession number :
- 177288641
- Full Text :
- https://doi.org/10.1016/j.mattod.2024.02.003