负极集流体为CNT导电纸的锂离子电池及其性能

Performance of Lithium Ion Batteries Using a Carbon Nanotube Conductive Paper as a Anode Current Collector

采用碳纳米管(Carbon nanotubes,CNT)导电纸替代传统的金属铜箔作锂离子电池的负极集流体,石墨作为活性材料。在0.2 C倍率条件下电池首次放电比容量高达815.7 m Ah·g-1,可逆放电比容量为474.0 m Ah·g-1,是铜箔作为负极集流体锂电池(236 m Ah·g-1)的2倍,10次循环后电池容量保持率97.2%。CNT导电纸有良好的强度、韧性、吸液性能。相比铜箔集流体,其结构可有效保证负极材料与碳纳米管导电纸集流体间的紧密接触,减少界面电阻,增加电子传导通道。碳纳米管导电纸有望替代传统铜箔成为新一代锂离子电池用集流体。

A new kind of carbon nanotubes （CNT） paper was used as anode current collector for lithium ion battery. Graphite was used as anode active materials. The prepared battery shows a high first special discharge capacity of 815.7 mAh g^-1 at the rate of 0.2 C, has a reversible special discharge capacity of 474.0 mAh · g^-1, which is two times larger than lithium ion battery with copper foil. It can keep a retention rate of 97.2% after 10 cycles. CNT paper has good performance in strength, toughness and adsorption of electrolyte. Compared with copper foil, the characteristics of the paper structure ensures the cathode materials to contact with CNT paper tightly, thus decrease the interface resistance, and increase the electrical conduction channel. The CNT paper is expected to become a new type of cathode current collector for lithium ion battery.