Abstract
Porous silicon powders prepared by etching Al-Si alloy using an acid solution was reported in the first time. The morphology and structure of as-obtained material were investigated using scanning electron microscopy (SEM) and X-ray diffraction (XRD) method. It was found that the spongy porous silicon powders presented well crystalline structure and consisted of nano-Si particles. The particle size of porous Si powders was about 20 μm, and the specific surface area was 102.7 m2·g-1. The electrochemical properties of porous silicon powders were evaluated as an anode material for lithium ion batteries. The material proportion in the porous silicon electrode was porous Si:conducting C:binder = 1:1:1. It was measured that in 1 LiPF6 mol·L-1, EC:DMC = 1:1 + 15%(by mass)FEC electrolyte, the first discharge capacity of porous silicon electrode was 2072 mAh·g-1 Si, and the capacity of 1431 mAh·g-1 Si was kept after 237 cycles at the charge and discharge current densities of 100 mA·g-1. Such high electrochemical performance of porous silicon electrode could be attributed to the spongy porous structure, which provided enough tiny space to buffer the huge volume variation of Si anode during charging/discharging process. The nano-size of Si particles was benefited to the diffusion process of lithium in Li-Si alloy, and the firm connection between Si nanoparticles could prevent the breakage of porous Si particles. This advanced method for producing high performance porous Si powders is simple and low cost, and has a bright prospect for the practical application
Graphical Abstract
Keywords
lithium-ion batteries, porous silicon, silicon electrode, Al-Si alloy, fluoroethylene carbonate
Publication Date
2014-02-25
Online Available Date
2014-02-24
Revised Date
2013-07-01
Received Date
2013-04-26
Recommended Citation
Shi-ji HAO, Chun-li LI, Kai ZHU, Ping ZHANG, Zhi-yu JIANG.
Preparation of High Performance Porous Silicon Powders by Etching Al-Si Alloy in Acid Solution for Lithium Ion Battery[J]. Journal of Electrochemistry,
2014
,
20(1): 1-4.
DOI: 10.13208/j.electrochem.130426
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol20/iss1/1
References
[1] Kim H, Seo M, Park M, et al. A critical size of silicon nano-anodes for lithium rechargeable batteries[J]. Angewandte Chemie International Edition, 2010, 49(12): 2146-2149.
[2] Hu L, Wu H, Hong S S, et al. Si nanoparticle-decorated Si nanowire networks for Li-ion battery anodes[J]. Chemical Communications, 2011, 47(1): 367-369.
[3] Park M, Kim M G, Joo J, et al. Silicon nanotube battery anodes[J]. Nano Letters, 2009, 9(11): 3844-3847.
[4] Jia H, Gao P, Yang J, et al. Novel three-dimensional mesoporous silicon for high power lithium-ion battery anode material[J]. Advanced Energy Materials, 2011, 1(6): 1036-1039.
[5] Su L, Zhou Z, Ren M, et al. Core double-shell Si@SiO2@C nanocomposites as anode materials for Li-ion batteries[J]. Chemical Communications, 2010, 46(15): 2590-2592.
[6] Pengfei Gao, Jianwei Fu, Jun Yang, et al. Microporous carbon coated silicon core/shell nanocomposite via in situ polymerization for advanced Li-ion battery anode material[J]. Physical Chemistry Chemical Physics, 2009, 11(47): 11101-11105.
[7] Profatilova I A, Stack C, Schmitz A, et al. Enhanced thermal stability of a lithiated nano-silicon electrode by fluoroethylene carbonate and vinylene carbonate[J]. Journal of Power Sources, 2013, 222: 140-149.
[8] Chen L B, Wang K, Xie X H, et al. Effect of vinylene carbonate (VC) as electrolyte additive on electrochemical performance of Si film anode for lithium ion batteries[J]. Journal of Power Sources, 2007, 174(2): 538-543.
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