Research On High Performance Metal Anode Based On 3D Current Collector

Lithium-ion batteries have the advantages of high energy density,long cycle life,small memory effect,and low pollution,and it is considered to be the most effective way to store electrical energy in the future.Three-dimensional electrodes are a hot research topic in the field of lithium-ion batteries.Compared with traditional electrodes,they can provide sufficient space for volume expansion,enhance electron and ion transfer capabilities,and provide more stable mechanical structures.Therefore,such electrodes show better cycle stability and rate performance in electrochemical tests,and are considered by many researchers to be one of the ideal choices for next-generation lithium-ion batteries.Starting from active materials,a variety of three-dimensional structure electrodes are designed as the anode of lithium-ion batteries: C-Ni₃Sn₂-Sn,Cu₃Sn and N-TiO₂ nanofibers were prepared by electrostatic spinning technology,and they were evenly coated on a planar current collector to form a three-dimensional network structure;A carbon nanofibers cloth binder-free anode was also prepared by electrostatic spinning.Graphite paper was used as the receiving plate.The nanofibers and graphite paper formed a three-dimensional network after calcination.The nanoparticles present on the surface of C-Ni₃Sn₂-Sn,Cu₃Sn,and N-TiO₂ nanofibers,on the basis of the three-dimensional structure,further increase the specific surface area of the material,providing more active sites for lithium ion insertion and extraction.The three-dimensional structured electrodes all show excellent electrochemical performance.The three-dimensional structure architecture provides space for the volume expansion of the Sn-based anode during cycling.The introduction of other metals improves the stability of the material structure.Carbon nanofibers cloth self-supporting three-dimensional anode with doping nitrogen,making it easier to combine with Li+,and its first discharge specific capacity is 3187 m Ah·g^-1.TiO₂ nanofibers also introduce the N element doping,which enhances the conductivity of TiO₂ and improves the absorption energy of Li+,and has obtained N-TiO₂ anode with the first specific discharge capacity of 691 m Ah·g^-1.