State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering ‡Department of Physics & State Key Laboratory of Silicon Materials, and §Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University , Hangzhou 310027, P. R. China.
ACS Appl Mater Interfaces. 2013 Oct 9;5(19):9850-5. doi: 10.1021/am403136e. Epub 2013 Sep 19.
Flexible free-standing CuO nanosheets (NSs)/reduced graphene oxide (r-GO) hybrid lamellar paper was fabricated through vacuum filtration and hydrothermal reduction processes. A unique three-dimensional nanoporous network was achieved with CuO NSs homogeneously embedded within the r-GO layers. This hybrid lamellar composite paper was examined as a binder-free anode for lithium ion batteries, and demonstrated excellent cyclic retention with the specific capacity of 736.8 mA h g(-1) after 50 cycles. This is much higher than 219.1 mA h g(-1) of the pristine CuO NSs and 60.2 mA h g(-1) of r-GO film at the same current density of 67 mA g(-1). The high capacitance and excellent cycling performance were generated from the integrated nanoporous structure compose of CuO NSs spaced r-GO layers, which offered an efficient electrically conducting channels, favored electrolyte penetration, and buffered to the volume variations during the lithiation and delithiation process. These outstanding electrochemical capabilities of CuO NSs/r-GO paper holds great promise for flexible binder-free anode for lithium ion batteries.
通过真空过滤和水热还原工艺制备了柔性独立的 CuO 纳米片（NSs）/还原氧化石墨烯（r-GO）混合片状纸。通过将 CuO NSs 均匀嵌入 r-GO 层中，实现了独特的三维纳米多孔网络。这种混合层状复合材料纸被用作锂离子电池的无粘合剂阳极，并在 50 次循环后以 736.8 mA h g(-1) 的比容量表现出优异的循环保持率。这明显高于原始 CuO NSs 的 219.1 mA h g(-1)和 r-GO 薄膜的 60.2 mA h g(-1)，电流密度相同为 67 mA g(-1)。高电容和优异的循环性能源自由 CuO NSs 隔开的 r-GO 层组成的集成纳米多孔结构，该结构提供了有效的导电通道，有利于电解质渗透，并在锂化和脱锂过程中缓冲体积变化。CuO NSs/r-GO 纸的这些出色的电化学性能为锂离子电池的柔性无粘合剂阳极提供了广阔的前景。
