The need for high energy batteries for traction applications and electrochemical characterization of the lithium-silicon system

摘要

1. We extend the small-strain treatment employing Stefan-Maxwell diffusion to incorporate swelling of a Li-Si electrode...easily implemented analytic solution obtained 2. Pragmatic result: (Ec_TΩ_(13))/(1-v)(a_(max)~2)/(D_(eff)t_0)|_(y=y_0) ＜＜σ_(Yield) for particle stability 3. For BEV type batteries, a 1C rate is rather high 3.1 We examine 1C charging (lithiation) of Si. It appears possible to stay below the yield stress of Si under these conditions. 4. The regular perturbation analysis does not capture the short-time behavior; this is resolved by means of matched asymptotics 5. We have not attempted to treat very high-rate operation (e.g., 100C), as the straight-forward regular perturbation analysis would no longer be valid, plastic deformation would be expected,...