碳纳米管膜表面金属化用于高电流输出柔性锂离子电池

采用磁控溅射技术对碳纳米管膜进行表面金属化处理,制备了导电性能优异的碳纳米管/金属复合薄膜,其电导率为纯碳纳米管膜的10倍(碳纳米管膜电导率为300 S·cm^-1)。以这种复合薄膜为集流体组装的柔性锂离子电池,具有比以纯碳纳米管膜作为集流体更优异的倍率性能(5 C倍率下比容量仍可保持132.6 mAh·g^-1)、大倍率循环性能(5 C倍率200圈循环后仍具有74.4%的容量保持率)和更大的输出电流(0.4 A)。

Surface Metallization of Carbon Nanotube Film for Flexible Lithium-ion Batteries with High Output Current

The CNTs/metal composite film with excellent electrical conductivity was prepared by magnetron sputtering technique. the electrical conductivity of the CNTs/metal composite film can reach 10 times than that of the as-prepared CNT macrofilm (CMF, 300 S·cm^-1). In addition, a flexible LIBs with this film as the current collector was prepared, which, in comparison with the flexible LIBs with the simple CNTs film, presents higher rate capability. Moreover, its specific capacity can still be maintained at 132.6 mAh·g^-1 at a rate of 5 C, high-rate cycling performance i.e. 74.4% capacity retention rate after 200 cycles at 5 C rate, and larger output current up to 0.4 A.