Silicon based anodes are prospective candidates for high energy density lithium ion batteries, but suffer from large volume expansion during cycling which leads to rapidly capacity fading. This work proposes a self-mechanical inhibition mechanism to restrict intrinsic Li-uptake in silicon suboxides (SiO) anode with graphene wrapping, and accordingly develops SiO/graphene/C composite anodes with superior cycling stability. The composite anode containing 19 wt% graphene, owing to interaction stress between SiO and graphene during lithiation reactions, behaves only 86% Li-uptake based on SiO itself, delivers 1244 mAh g⁻¹ reversible capacity at 0.05C, displays merely 67% volume expansion ratio (113% for SiO@C anode) after full lithiation and shows 86.2% capacity retention (44.9% for SiO@C anode) after 500 cycles at 1C. A 26.3 Ah pouch cell prepared with Ni-rich cathode and SiO/graphene/C blended graphite anode achieves energy density of 353 Wh kg⁻¹ at 2.8-4.3 V and displays 78.1% capacity retention after 500 cycles at 0.2C.

硅基阳极是高能量密度锂离子电池的潜在候选者，但在循环过程中会遭受体积膨胀​​，从而导致容量快速下降。这项工作提出了一种自机械抑制机制，以限制石墨烯包裹的次氧化硅（SiO）阳极中固有的Li吸收，从而开发出具有优异循环稳定性的SiO /石墨烯/ C复合阳极。包含19 wt％的石墨烯的复合阳极由于在锂化反应期间SiO和石墨烯之间的相互作用应力，仅基于SiO自身表现出86％的锂吸收，提供了1244 mAh g ^-1在0.05C时具有可逆容量，在完全锂化后仅显示67％的体积膨胀率（对于SiO @ C阳极为113％），在1C下500次循环后显示86.2％的容量保持率（对于SiO @ C阳极为44.9％）。用富镍阴极和SiO /石墨烯/ C混合石墨阳极制备的26.3 Ah袋式电池在2.8-4.3 V下的能量密度为353 Wh kg ^-1，在0.2C下500次循环后显示78.1％的容量保持率。