Silicon dioxide(SiO)is regarded as a promising anode candidate for high-energy-density lithium-ion batteries(LIBs)owing to its superior theoretical specific capacity.However,SiO anodes encounter substantial challenges...Silicon dioxide(SiO)is regarded as a promising anode candidate for high-energy-density lithium-ion batteries(LIBs)owing to its superior theoretical specific capacity.However,SiO anodes encounter substantial challenges,including substantial volume expansion and persistent growth of a thick solid electrolyte interphase(SEI).In this work,a composite conductive network with dual pinning and piezoelectric effects is proposed,which is cleverly designed to improve the electrochemical reaction kinetics of the electrode.Within the proposed network architecture,single-walled carbon nanotubes(CNTs)serve as fast electronic conductors and structural protective layers,forming a three-dimensional(3D)coating network on the surface of SiO particles.Barium titanate(BTO)nanoparticles are anchored at the nodes of the CNT network through the formation of rigid anchor points,dispersing stress throughout the network.Concurrently,mechanical stress induced by electrochemical reactions prompts BTO to generate a local electric field,facilitating Li^(+)transport.Consequently,the developed anode(SiO@PCB)demonstrates remarkable electrochemical performance in LIBs,exhibiting a capacity retention rate of 94%even after 500 cycles at 1 A g^(-1).Furthermore,a capacity retention of 71.6%is demonstrated by SiO@PCB anode after 1000 cycles at 5 C in sulfide-based all-solid-state LIBs using an NCM83 cathode.This composite conductive network structure provides an effective guidance plan for achieving interface stability and long-term lithium storage of Si-based anodes.展开更多
文摘Silicon dioxide(SiO)is regarded as a promising anode candidate for high-energy-density lithium-ion batteries(LIBs)owing to its superior theoretical specific capacity.However,SiO anodes encounter substantial challenges,including substantial volume expansion and persistent growth of a thick solid electrolyte interphase(SEI).In this work,a composite conductive network with dual pinning and piezoelectric effects is proposed,which is cleverly designed to improve the electrochemical reaction kinetics of the electrode.Within the proposed network architecture,single-walled carbon nanotubes(CNTs)serve as fast electronic conductors and structural protective layers,forming a three-dimensional(3D)coating network on the surface of SiO particles.Barium titanate(BTO)nanoparticles are anchored at the nodes of the CNT network through the formation of rigid anchor points,dispersing stress throughout the network.Concurrently,mechanical stress induced by electrochemical reactions prompts BTO to generate a local electric field,facilitating Li^(+)transport.Consequently,the developed anode(SiO@PCB)demonstrates remarkable electrochemical performance in LIBs,exhibiting a capacity retention rate of 94%even after 500 cycles at 1 A g^(-1).Furthermore,a capacity retention of 71.6%is demonstrated by SiO@PCB anode after 1000 cycles at 5 C in sulfide-based all-solid-state LIBs using an NCM83 cathode.This composite conductive network structure provides an effective guidance plan for achieving interface stability and long-term lithium storage of Si-based anodes.
