skip to main content

SciTech ConnectSciTech Connect

Title: Structural transformation of macroporous silicon anodes as a result of cyclic lithiation processes

Anodes based on a regular lattice of macroporous silicon with different periods, sizes, and shapes of pore cross sections are studied. The discharge capacity and its degradation during cycling (embedding and extraction of lithium) are examined. Scanning electron microscopy is used to analyze changes in the electrode structure upon the lithiation/delithiation of Si and to evaluate the elemental composition of the porous material. An ex situ morphological analysis of the electrodes demonstrates that, on the whole, the porous structure is preserved upon cycling and the thickness of silicon walls increases. The degree of Si-wall destruction depends on their initial thickness. Estimates show that the electrolyte reduction process mainly occurs according to the two-electron mechanism, with inorganic salts of lithium formed as a result.
Authors:
 [1] ;  [2] ; ;  [1] ;  [3] ; ;  [1] ;  [2]
  1. Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)
  2. Russian Academy of Sciences, Frumkin Institute of Physical Chemistry and Electrochemistry (Russian Federation)
  3. National Research University of Information Technologies, Mechanics, and Optics (Russian Federation)
Publication Date:
OSTI Identifier:
22210534
Resource Type:
Journal Article
Resource Relation:
Journal Name: Semiconductors; Journal Volume: 47; Journal Issue: 9; Other Information: Copyright (c) 2013 Pleiades Publishing, Ltd.; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANODES; ELECTROLYTES; LITHIUM; POROUS MATERIALS; SCANNING ELECTRON MICROSCOPY; SILICON; THICKNESS