TY - JOUR
T1 - A finite deformation stress-dependent chemical potential and its applications to lithium ion batteries
AU - Cui, Zhiwei
AU - Gao, Feng
AU - Qu, Jianmin
PY - 2012/7
Y1 - 2012/7
N2 - This paper reports the development of a new stress-dependent chemical potential for solid state diffusion under multiple driving forces including mechanical stresses. The new stress-dependent chemical potential accounts for nonlinear, inelastic, and finite deformation. By using this stress-dependent chemical potential, insertion and extraction of lithium ions into a silicon particle is investigated. The distribution and evolution of diffusion-induced stress during the insertion/extraction processes are numerically calculated. Critical particle size is obtained as a function of the charging/discharging rates. It is also found that when plastic deformation occurs, the hoop stresses on the particle surface, contrary to intuition, can become positive even during the charging process, which may explain some of the recent experimental observations.
AB - This paper reports the development of a new stress-dependent chemical potential for solid state diffusion under multiple driving forces including mechanical stresses. The new stress-dependent chemical potential accounts for nonlinear, inelastic, and finite deformation. By using this stress-dependent chemical potential, insertion and extraction of lithium ions into a silicon particle is investigated. The distribution and evolution of diffusion-induced stress during the insertion/extraction processes are numerically calculated. Critical particle size is obtained as a function of the charging/discharging rates. It is also found that when plastic deformation occurs, the hoop stresses on the particle surface, contrary to intuition, can become positive even during the charging process, which may explain some of the recent experimental observations.
KW - Chemical potential
KW - Diffusion Induced Stress (DIS)
KW - Finite deformation
KW - Lithiation
KW - Lithium-ion battery
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U2 - 10.1016/j.jmps.2012.03.008
DO - 10.1016/j.jmps.2012.03.008
M3 - Article
AN - SCOPUS:84860510557
SN - 0022-5096
VL - 60
SP - 1280
EP - 1295
JO - Journal of the Mechanics and Physics of Solids
JF - Journal of the Mechanics and Physics of Solids
IS - 7
ER -