Two-way coupled analysis of lithium diffusion and diffusion induced finite elastoplastic bending of bilayer electrodes in lithium-ion batteries

Experimental measurement of electro-chemo-mechanical properties of a composite silicon electrode in lithium ion batteries

“…This is consistent with lithiation-induced softening predicted by the DFT calculations, 31 and it has the same magnitude as in the results reported by MOSS. 11,15,18,23,25 It should be noted that the elastic modulus of Si composite electrodes measured here is much smaller than that of the Si material itself due to the influence of the pores and other electrode components ( e.g. , binder and carbon tubes).…”

“…The curvature increases in a linear trend in the lithiation process, which can identify that the bilayer electrode is in the elastic range. 23,25 During the delithiation process, the lithium ions are extracted from the Si particles and the active layer contracts. The stress at the active layer/Cu current collector decreases.…”

“…The gauge length becomes a partial spherical shell at the deformed state. Assuming that the relative rotation of two cross-sections of the initial unit length is θ 0 , 23 the total stretch ratio of a longitudinal line can be written as. λ θ = rθ 0 = ( r i + z ) θ 0 = r i θ 0 + θ 0 z = λ ( i ) θ + θ 0 z …”