CAJ | 학술논문

采用超轻的碳纳米管(Carbon nanotubes, CNTs)宏观膜替代传统的金属铝集流体,替换后的锂离子电池以 LiCoO2为活性物质,在1 C 条件下电池首次放电比容量为132.8 mAh·g-1,500次循环后容量保持率高于80%；当正极材料层面密度为16 mg·cm-2时,LiCoO2-CNT 电极的能量密度比 LiCoO2-Al 电极提高25%；同时,CNTs 膜作为正极集流体的电池自放电率低于1.5%。该 CNTs 膜经电流刺激后仍保持较高的石墨化程度,相比金属集流体,其表面束状的多孔结构可有效保证正极材料层和集流体间的紧密接触。该膜有望替代传统铝箔成为新一代锂离子电池用集流体。
채용초경적탄납미관(Carbon nanotubes, CNTs)굉관막체대전통적금속려집류체,체환후적리리자전지이 LiCoO2위활성물질,재1 C 조건하전지수차방전비용량위132.8 mAh·g-1,500차순배후용량보지솔고우80%；당정겁재료층면밀도위16 mg·cm-2시,LiCoO2-CNT 전겁적능량밀도비 LiCoO2-Al 전겁제고25%；동시,CNTs 막작위정겁집류체적전지자방전솔저우1.5%。해 CNTs 막경전류자격후잉보지교고적석묵화정도,상비금속집류체,기표면속상적다공결구가유효보증정겁재료층화집류체간적긴밀접촉。해막유망체대전통려박성위신일대리리자전지용집류체。
A carbon nanotube (CNT) film was used as the current collector and LiCoO2 as the cathode for a lithium ion battery. The battery showed a high initial discharge capacity of 132. 8 mAh·g-1 , a high retention rate of over 80% after 500 cycles under 1C and a low self-discharge rate of 1. 5% . When the areal density of the CNT film is 16 mg·cm-2 , the energy density of the LiCoO2-CNT battery is 25% larger than that of a LiCoO2-Al battery. The superior properties of the battery may be attributed to the high electrochemical stability of the graphitic structure of CNTs and the porous surface of the CNT film that ensures a high contact surface area between the current collector and the cathode material. The CNT film is promising as a new current collector for lithium ion bat-teries. Macroscopical carbon nanotubes (CNTs) was studied as current collector for lithium ion battery. LiCoO2 was used as active substance. The prepared battery showed high first special discharge capacity (132. 8mAh·g-1 ) and retention rate (over 80% ) after 500 cycles under 1C. When the areal density of cathode layer is 16mg cm-2 , energy density of LiCoO2-CNT battery is 25% larger than that of LiCoO 2-Al battery. Meanwhile, the battery with CNTs film as current collector has low self-discharge rate (1. 5% ). The superior properties of the battery maybe attribute to graphite structure even underwent current and porous surface of the CNTs film. The characteristic of the surface ensures the cathode to contact with CNTs film tightly. Considering the stable and outstanding properties , the CNTs film is expected to be a new current collector for lithium ion battery.