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首页> 外文期刊>Journal of Applied Polymer Science >Centrifugally spun carbon fibers prepared from aqueous poly(vinylpyrrolidone) solutions as binder-free anodes in lithium-ion batteries
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Centrifugally spun carbon fibers prepared from aqueous poly(vinylpyrrolidone) solutions as binder-free anodes in lithium-ion batteries

机译：离心纺丝由含水（乙烯基吡咯烷酮）溶液制备的碳纤维，作为锂离子电池的无粘合剂阳极

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摘要

Aqueous solutions of poly(vinylpyrrolidone) (PVP) of various concentrations (20, 25, and 28 wt%) were successfully spun into fibers by centrifugal spinning. The pristine PVP fibers were annealed and carbonized to produce flexible carbon fibers for use as binder-free anodes in lithium-ion batteries. These flexible carbon fibers were prepared by developing a novel three-step heat treatment to reduce the residual stresses in the pristine PVP precursor fibers, and to prevent fiber degradation during carbonization. The thermogravimetric analysis data showed that the annealed fibers yielded a residual mass percentage of 36.0% while the pristine PVP fibers suffered a higher mass loss and only retained 26.5% of original mass above 450 degrees C (under nitrogen). The electrochemical performance of the carbon-fiber anodes was evaluated by conducting galvanostatic charge/discharge, rate performance, and cycle voltammetry experiments. The 20, 25, and 28 wt% derived binder-free anodes delivered specific charge capacities of 205, 189, and 275 mAh g(-1), respectively, after the first cycle at a current density of 100 mA g(-1). The results obtained in this work indicate that a feasible pathway towards a large-scale production of carbon-fiber anodes from a 100% aqueous solution can be achieved via centrifugal spinning and subsequent heat treatment.
机译：通过离心纺丝成功地将不同浓度（20、25和28 wt%）的聚（乙烯基吡咯烷酮）（PVP）水溶液纺丝成纤维。对原始的PVP纤维进行退火和碳化，以生产柔性碳纤维，用作锂离子电池的无粘结剂阳极。这些柔性碳纤维是通过开发新的三步热处理来制备的，以降低原始PVP前体纤维中的残余应力，并防止碳化过程中纤维降解。热重分析数据显示，退火纤维的残余质量百分比为36.0%，而原始PVP纤维的质量损失更大，在450℃以上（氮气条件下）仅保留原始质量的26.5%。通过恒电流充放电、速率性能和循环伏安实验，评估了碳纤维阳极的电化学性能。在电流密度为100 mA g（-1）的第一次循环后，20、25和28 wt%衍生无粘结剂阳极的比电荷容量分别为205、189和275 mAh g（-1）。这项工作的结果表明，通过离心纺丝和随后的热处理，可以实现从100%水溶液中大规模生产碳纤维阳极的可行途径。

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