材料科学
静电纺丝
阴极
纳米纤维
碳纳米纤维
化学工程
介孔材料
电池(电)
成核
纳米技术
活性炭
碳纤维
碳纳米管
复合材料
有机化学
催化作用
复合数
化学
吸附
聚合物
物理化学
功率(物理)
工程类
物理
量子力学
作者
Hongjiao Nie,Chi Xu,Wei Zhou,Baoshan Wu,Xianfeng Li,Tao Liu,Huamin Zhang
标识
DOI:10.1021/acsami.5b10088
摘要
Free-standing activated carbon nanofibers (ACNF) were prepared through electrospinning combining with CO2 activation and then used for nonaqueous Li-O2 battery cathodes. As-prepared ACNF based cathode was loosely packed with carbon nanofibers complicatedly overlapped. Owing to some micrometer-sized pores between individual nanofibers, relatively high permeability of O2 across the cathode becomes feasible. Meanwhile, the mesopores introduced by CO2 activation act as additional nucleation sites for Li2O2 formation, leading to an increase in the density of Li2O2 particles along with a size decrease of the individual particles, and therefore, flake-like Li2O2 are preferentially formed. In addition, the free-standing structure of ACNF cathode eliminates the side reactions about PVDF. As a result, the Li-O2 batteries with ACNF cathodes showed increased discharge capacities, reduced overpotentials, and longer cycle life in the case of full discharge and charge operation. This provides a novel pathway for the design of cathodes for Li-O2 battery.
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