In Situ Artificial Hybrid SEI Layer Enabled High-Performance Prelithiated SiO_x Anode for Lithium-Ion Batteries

摘要

Considered the promising anode material for next-generation high-energylithium-ion batteries, SiO_x has been slow to commercialize due to its lowinitial Coulombic efficiency (ICE) and unstable solid electrolyte interface (SEI)layer, which leads to reduced full-cell energy density, short cycling lives, andpoor rate performance. Herein, a novel strategy is proposed to in situconstruct an artificial hybrid SEI layer consisting of LiF and Li_3Sb on aprelithiated SiO_x anode via spontaneous chemical reaction with SbF_3. Inaddition to the increasing ICE (94.5), the preformed artificial SEI layer withlong-term cycle stability and enhanced Li~+ transport capability enables aremarkable improvement in capacity retention and rate capability for modifiedSiO_x. Furthermore, the full cell using Li(Ni_(0.8)Co_(0.1)Mn_(0.1))O_2 and a pre-treatedanode exhibits high ICE (86.0) and capacity retention (86.6) after 100cycles at 0.5 C. This study provides a fresh insight into how to obtain stableinterface on a prelithiated SiO_x anode for high energy and long lifespanlithium-ion batteries.