Effects of Electrolytic Copper Foil Roughness on Lithium-Ion Battery Performance

Improving the interfacial properties between electrode materials and current collectors plays a significant role in lithium-ion batteries. Here, four kinds of electrolytic copper foils with roughness (Rz) values 1.2, 1.5, 2.2, 2.8 μm were prepared via an electropolishing technique. Reducing foil can effectively improve wettability anode slurry. The value 1.2 shows best coating uniformity graphite battery this (Rz = μm) as collector exhibits fifth-cycle capacities 358.7 102.5 mAh g−1 at 0.2 3.0 C, respectively, showing excellent rate capability. In addition, 0.5 initial discharge capacity 319.5 100th-cycle retention 98.1%, demonstrating high level cycling performance. These results indicate that reducing provide feasible route to performance