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首页> 外文期刊>Journal of Applied Electrochemistry >Carbon nanotubes/amorphous carbon composites as high-power negative electrodes in lithium ion capacitors
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Carbon nanotubes/amorphous carbon composites as high-power negative electrodes in lithium ion capacitors

机译：碳纳米管/非晶碳复合材料作为锂离子电容器中的大功率负极

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A nitrogen-rich carbon nanotubes/amorphous carbon (CNT/C) composite was prepared by carbonising a CNT/polyaniline (PANI) composite, and characterised. Scanning electron microscopy and X-ray photoelectron spectroscopy confirmed that the composite retained a mesoporous CNT structure as its backbone, whilst the nitrogen-rich PANI-derived carbon formed a thin amorphous coating on the CNT surface. Electrochemical characterisation of the CNT/C composite indicated that it had nearly double the reversible Li~+ intercalation capacity (390 vs. 219 mAh g~(-1)) and 39 % less irreversible capacity (622 vs. 1,015 mAh g~(-1)) than the pristine CNT. The CNT/C composite showed exceptionally high rate capability with a de-intercalation capacity of 81 mAh g~(-1) at a very high charge/discharge rate of 60 C (time taken for charge or discharge is 1 min) (1 C = 1 h charge or discharge), whereas the pristine CNT delivered 53 mAh g~(-1) at this C-rate. By comparison, the rate capabilities of conventional graphite (N3 and SLP30) were very poor above 5 C (~17 mAh g~(-1) at 5 C). Both the pristine CNT and CNT/C composite showed an excellent cyclability at 1 C charge/ discharge over 600 cycles. The CNT/C composite maintained a fairly stable capacity of ~200 mAh g~(-1) after 600 cycles, whilst the commercial graphite showed a steady and significant decrease in de-intercalation capacity; reaching <70 mAh g~(-1) after 600 cycles.
机译：通过碳化CNT /聚苯胺（PANI）复合材料来制备富氮碳纳米管/非晶碳（CNT / C）复合材料，并进行表征。扫描电子显微镜和X射线光电子能谱证实，该复合材料保留了中孔CNT结构作为其骨架，而富含氮的PANI衍生的碳在CNT表面上形成了一层薄的无定形涂层。 CNT / C复合材料的电化学特性表明，其可逆Li〜+嵌入容量几乎翻了一番（390对219 mAh g〜（-1）），不可逆容量降低了39％（622对1,015 mAh g〜（-） 1））比原始的CNT。 CNT / C复合材料显示出极高的速率能力，在60 C的极高充电/放电速率下（充电或放电时间为1分钟）（1 C），脱嵌容量为81 mAh g〜（-1） = 1 h充电或放电），而原始CNT在此C速率下递送53 mAh g〜（-1）。相比之下，常规石墨（N3和SLP30）的速率能力在5 C以上（5 C时约为17 mAh g〜（-1））非常差。原始CNT和CNT / C复合材料在600次循环的1 C充电/放电下均表现出出色的循环能力。碳纳米管/碳复合材料经过600次循环后仍保持了约200 mAh g〜（-1）的相当稳定的容量，而商用石墨的脱嵌能力却出现了稳定而显着的下降。 600次循环后达到<70 mAh g〜（-1）。

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