Abstract
Metallic copper is widely used as current collector(CC)for graphite anode of lithium-ion batteries(LIBs)due to its high electrical con-ductivity and electrochemical stability.However,the large volume density of commercial copper foil(～8.9 g·cm-3)limits the increase of energy density of battery.Here,copper-coated porous polyimide(Cu@PPI)was prepared by vacuum evaporation as collector for the graphite anode.The sandwich structure connects the copper metal on both sides of the collector with excellent electrical conductivity.Compared to commercial Cu foil,Cu@PPI has lighter mass(≤3.9 mg for disc of 12 mm diameter versus 9.9 mg of～10 μm Cu foil)and lower volume density(≤3.3 g·cm-3).In ad-dition,the porous structure allows of better adhesion of reactive substances and electrochemical properties than pure Cu foils.It is estimated that the energy density of Cu@PPI should be much higher than that of Cu foil.This strategy should be applicable for other current collectors.
基金项目
Foshan Science and Technology Innovation Team(2019)(1920001000108)
Guangdong Basic and Applied Basic Research Foundation(2021A1515111103)
广州市科技计划(202201010867)
Science and Technology Major Project of Guangdong Province(220110165851234)
国家重点研发计划(2020YFB0408100)
维普
万方数据