skip to main content

SciTech ConnectSciTech Connect

Title: Effects of reversible chemical reaction on Li diffusion and stresses in spherical composition-gradient electrodes

Composition-gradient electrode materials have been proven to be one of the most promising materials in lithium-ion battery. To study the mechanism of mechanical degradation in spherical composition-gradient electrodes, the finite deformation theory and reversible chemical theory are adopted. In homogeneous electrodes, reversible electrochemical reaction may increase the magnitudes of stresses. However, reversible electrochemical reaction has different influences on stresses in composition-gradient electrodes, resulting from three main inhomogeneous factors—forward reaction rate, backward reaction rate, and reaction partial molar volume. The decreasing transition form of forward reaction rate, increasing transition form of backward reaction rate, and increasing transition form of reaction partial molar volume can reduce the magnitudes of stresses. As a result, capacity fading and mechanical degradation are reduced by taking advantage of the effects of inhomogeneous factors.
Authors:
; ; ; ;  [1]
  1. School of Aerospace Engineering and Applied Mechanics, Tongji University, No. 1239 Siping Road, Shanghai 200092 (China)
Publication Date:
OSTI Identifier:
22490734
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 24; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CHEMICAL REACTIONS; ELECTROCHEMISTRY; ELECTRODES; LITHIUM ION BATTERIES; PARTIAL MOLAL VOLUME; REACTION KINETICS; STRESSES