We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
High rate capability caused by surface cubic spinels in Li-rich layer-structured cathodes for Li-ion batteries.
- Authors
Song, Bohang; Hongwei Liu; Zongwen Liu; Pengfei Xiao; Man On Lai; Li Lu
- Abstract
Modified Li-rich layered cathode Li(Li0.2Mn0.54Ni0.13Co0.13)O2 has been synthesized by a simple strategy of using surface treatment with various amounts (0-30 wt.%) of Super P (carbon black). Based on detailed characterizations from X-ray diffraction (XRD), high resolution transmission electron microscope (HRTEM), X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS), it is suggested that the phase transformation from Li2MnO3-type of structure to spinel-like phase take place at the surface regions of particles during post annealing process at 350°C, leading to increase in both first coulombic efficiency and rate capability, from 78% and 100 mA.g-1 (charge capacity at 2500 mA.g-1) of the pristine material to 93.4% and 200 mA.g-1. The evidences of spinel formation and the reasons for electrochemical enhancement are systematically investigated.
- Subjects
LITHIUM-ion batteries; CATHODES; SURFACE preparation; X-ray diffraction; CARBON-black; ELECTROCHEMICAL analysis
- Publication
Scientific Reports, 2013, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep03094