Organic carbonized copper foil facilitates the performance of the current collector for lithium-ion batteries

Abstract

3,4,9,10-Perylenetetracarboxylic dianhydride (3,4,9,10-PTCDA) is electrospun as a carbon source onto the Cu foil surface, then carbonizes at high temperature to obtain an organic carbon membrane (2.8 μm) covered on Cu foil. The obtained organic carbonized Cu foil displays a larger electrolyte contact angle, and can effectively enhance the corrosion resistance of the electrolyte. Moreover, this organic carbon layer can effectively increase the adhesion between graphite and Cu foil, reduce the interface impedance, and significantly improve the conductivity and lithium storage behaviors of the graphite electrode. The initial charge capacity of an organic carbonized Cu-graphite/Li battery is as high as 355.9 mA h g⁻¹, which is higher than the pristine Cu-graphite/Li battery (300.9 mA h g⁻¹). After 454 cycles, the charging capacity remains at 345.9 mA h g⁻¹ with capacity retentions of 97.2%, which is also much larger than the battery based on pristine Cu foil (236.9 mA h g⁻¹ with retentions of 78.7% after 300 cycles). After a carbon film formed on the surface of Cu foil, the conductivity, capacity, cycling and rate capabilities of both half batteries based on a Cu-graphite/Li electrode and full battery based on the organic carbonized Cu-graphite/LiNi_0.8Co_0.1Mn_0.1O₂ electrode are greatly improved, which provides novel ideas for the development of a high performance collector in lithium ion batteries (LIBs).