Journal
JOURNAL OF POWER SOURCES
Volume 196, Issue 8, Pages 3868-3873Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2010.12.101
Keywords
Porous Li-Si film; Electrodeposition; Negative electrode; Lithium-ion battery
Funding
- NSFC [20873085]
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A porous-microspheres Li-Si film (PMLSF) is prepared by multi-step constant current (MSCC) electrodeposition on Cu foil. Its structure and morphology are characterized using X-ray diffraction (XRD) and scanning electron microscope (SEM). As negative electrodes of lithium-ion batteries, the PMLSF electrode delivers the first gravimetric and geometric charge capacities of 2805.7 mA h g(-1) and 621.9 mu A h cm(-2) at the current density of 25.5 mu A cm(-2), and its initial coulombic efficiency is as high as 98.2%. When the PMLSF electrode is cycled in VC-containing electrolyte, the superior cycling performance can be obtained. After 50 cycles, 96.0% of its initial capacity is retained at the current density of 50.0 mu A cm(-2). Electrochemical impedance spectra (EIS) research confirms the positive effect of VC additive on the behavior of the PMLSF electrode. (c) 2011 Elsevier B.V. All rights reserved.
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