Facile polymer-assisted synthesis of LiNi0.5Mn1.5O4 with a hierarchical micro–nano structure and high rate capability
- 26 April 2012
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in RSC Advances
- Vol. 2 (13), 5669-5675
- https://doi.org/10.1039/c2ra20669b
Abstract
We report the facile preparation of spinel type LiNi0.5Mn1.5O4 with hierarchical micro–nano structures (LNMO-HMs) and their application as cathode materials for rechargeable lithium-ion batteries. The LNMO-HMs, which were synthesized through a poly(ethylene glycol) (PEG)-assisted co-precipitation route, have a particle size of 5–10 μm, which are composed of nano-particles with a size of about 200 nm. The effect of PEG on the phase purity and morphology of the LNMO products was studied. It was found that as the molecular weight of PEG increased, the lithium nickel oxide impurity decreased at first and then increased slightly. The average size of the nano-particles also showed a similar trend of first a decrease and then an increase, while the secondary micro-particles were enlarged with longer PEG chains. Raman mapping technology proved that the P4332 phase and the Fd3m phase LNMO coexist in the as-prepared samples, but the latter is the mainstay. When applied as cathode materials for lithium-ion batteries, PEG4000-assisted LNMO-HMs showed a remarkably high rate capability and cycling stability. The deliverable discharge capacity exceeded 120 mAh g−1 at 40 C current rate and the capacity retention approached 89% after 150 cycles at 5 C current rate, showing the potential in the application of high rate discharge.Keywords
This publication has 50 references indexed in Scilit:
- Prospective materials and applications for Li secondary batteriesEnergy & Environmental Science, 2011
- Functional Materials for Rechargeable BatteriesAdvanced Materials, 2011
- Better lithium-ion batteries with nanocable-like electrode materialsEnergy & Environmental Science, 2011
- Who will drive electric vehicles, olivine or spinel?Energy & Environmental Science, 2011
- Recent advances in rechargeable battery materials: a chemist’s perspectiveChemical Society Reviews, 2009
- Combination of Lightweight Elements and Nanostructured Materials for BatteriesAccounts of Chemical Research, 2009
- Nanomaterials for Rechargeable Lithium BatteriesAngewandte Chemie-International Edition, 2008
- Building better batteriesNature, 2008
- Nanostructured materials for advanced energy conversion and storage devicesNature Materials, 2005
- Lithium insertion into manganese spinelsMaterials Research Bulletin, 1983