Park Inyeong, Kim Heeyun, Shim Sang Eun, Baeck Sung-Hyeon
J Nanosci Nanotechnol. 2015 Nov;15(11):9061-5. doi: 10.1166/jnn.2015.11572.
This study addresses the effects of the pore structures of carbon materials used as cathodes for non-aqueous lithium-air batteries on cycle life. Carbon Nanofibers (CNFs) were synthesized by electrospinning polyacrylonitrile (PAN) and carbonization. The synthesized CNF was then converted to activated carbon nanofibers (ACNFs) under flowing CO2. The specific surface areas CNFs were increased on activation. ACNFs were arranged randomly to form a web-like structure providing both oxygen pathways and a means of discharging products. To examine the electrochemical properties of ACNF, charge-discharge tests were conducted using a Swagelok-type cell at a constant current density of 0.2 mA/cm2; impedance tests were also conducted. ACNF sheet electrodes had cycle lives of up to 50 cycles, which was attributed to high surface area and porosity, although overpotentials for both charge and discharge were high. This cycling performance showed that the pore structure of sheet ACNF is more suitable for the transport of oxygen and for the storage of discharge products than carbon powders.
本研究探讨了用作非水锂空气电池阴极的碳材料的孔结构对循环寿命的影响。通过静电纺丝聚丙烯腈（PAN）并碳化来合成碳纳米纤维（CNF）。然后在流动的二氧化碳中将合成的CNF转化为活性炭纳米纤维（ACNF）。活化后CNF的比表面积增加。ACNF随机排列形成网状结构，提供氧气通道和排出产物的途径。为了研究ACNF的电化学性能，使用Swagelok型电池在0.2 mA/cm²的恒定电流密度下进行充放电测试；还进行了阻抗测试。ACNF片状电极的循环寿命高达50次循环，这归因于高比表面积和孔隙率，尽管充放电的过电位都很高。这种循环性能表明，片状ACNF的孔结构比碳粉更适合氧气传输和放电产物存储。
