▎ 摘　　要

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.