Improving Cycle Life of Silicon-Dominant Anodes Based on Microscale Silicon Particles under Partial Lithiation

Using only parts of the maximum capacity silicon microparticles in a lithium-ion battery (LIB) anode represents promising material concept. The high capacity, better rate capability compared with graphite and accessibility on an industrial scale, as well its attractive cost make microsilicon ideal choice for next generation material. However, currently cycle life LIBs using particles is limited due to drastic volume change Si during lithiation delithiation. Continuous formation solid electrolyte interphase (SEI) associated lithium loss are main failure mechanisms, while particle decoupling from conductive network plays role mainly operation at low discharge voltages. present study discusses approaches material- cell-level enhance performance partially lithiated microparticle-based full cells by addressing previously described mechanisms. Reducing surface area coating their carbon improve electronic contact, prelithiation compensate losses have proven be most approaches. advantageous combination these routes resulted significant increase cycling stability exceeding 600 cycles 80% retention initial about 1000 mAh g−1 level, 250 non-optimized cell.