Paper is emerging as a promising flexible, high surface‐area substrate for various new applications such as printed electronics, energy storage, and paper‐based diagnostics. Many applications, however, require paper that reaches metallic conductivity levels, ideally at low cost. Here, an aqueous electroless copper‐plating method is presented, which forms a conducting thin film of fused copper nanoparticles on the surface of the cellulose fibers. This paper can be used as a current collector for anodes of lithium‐ion batteries. Owing to the porous structure and the large surface area of cellulose fibers, the copper‐plated paper‐based half‐cell of the lithium‐ion battery exhibits excellent rate performance and cycling stability, and even outperforms commercially available planar copper foil‐based anode at ultra‐high charge/discharge rates of 100 C and 200 C. This mechanically robust metallic‐paper composite has promising applications as the current collector for light‐weight, flexible, and foldable paper‐based 3D Li‐ion battery anodes.

中文翻译：

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高性能锂离子电池用镀铜纸

纸张正在成为一种有前景的柔性高表面积基材，可用于各种新应用，例如印刷电子，能源存储和基于纸张的诊断。但是，许多应用都要求纸张达到金属导电性水平，理想情况下是低成本的。在这里，提出了一种化学镀铜的水性方法，该方法在纤维素纤维的表面上形成了熔融铜纳米粒子的导电薄膜。本文可用作锂离子电池负极的集电器。由于纤维素纤维的多孔结构和较大的表面积，锂离子电池的铜镀纸纸半电池具有出色的倍率性能和循环稳定性，