LARGE-AREA COPPER NANOFOAM WITH HIERARCHICAL STRUCTURE FOR USE AS ELECTRODE

A facile method is based on a pack-cementation process using large-area copper foil instead of copper powder. By controlling a pack-cementation time and an amount of alloying element (e.g., aluminum), a hierarchical microporous or nanoporous copper can be created. When coated with tin active material, the hierarchical microporous or nanoporous copper can be used as an advanced lithium-ion battery anode. A coin-cell test exhibited a four-fold higher areal capacity (e.g., 7.4 milliamp-hours per square centimeter without any performance degradation up to 20 cycles) as compared to a traditional graphite anode. 一种简便方法基于使用大面积铜箔代替铜粉末的包埋渗工艺。通过控制包埋渗时间和合金元素(例如，铝)的量，能够产生分层多微孔或纳米多孔铜。当用锡活性材料涂布时，所述分层多微孔或纳米多孔铜能够被用作先进锂离子电池负极。纽扣电池测试显示出如与传统石墨负极比较高四倍的面积容量(例如，每平方厘米7.4毫安时，在多达20次循环情况下没有任何性能降级)。