竹基碳纤维/MoS2锂离子电池负极材料

Bamboo-based carbon fibers/MoS2 composite as an anode material for lithium ion batteries

  • 摘要: 随着电子产品、电动汽车以及智能电网的快速发展,不仅需要锂离子电池(LIBs)具有优异的储锂性能,而且要求电极材料成本低廉、资源丰富和绿色环保。基于碳负极材料的优点,将废弃的一次性竹筷,在碱性溶液中经过可控的热处理,利用竹子中丰富的天然纤维素,从而获得尺寸均匀的碳纤维(CFs)材料。相比于石墨电极,竹基CFs作为LIBs的负极材料时表现出优异的电化学性能。为进一步提高其储锂性能,以CFs为骨架,通过水热法在其表面制备了一层二硫化钼(MoS2)纳米花,形成核壳结构的CFs/MoS2复合电极材料。电化学测试结果表明,CFs电极在200 mA/g的电流密度下循环500次,放电比容量仍有381.1 mA·h/g;CFs/MoS2复合材料在1000 mA/g的大电流密度下经过1000次循环,仍保持有843 mA·h/g的放电比容量。

     

    Abstract: With the rapid development of electronic products, electric vehicles and smart grids, lithium-ion batteries (LIBs) are required to not only possess superior lithium storage performance, but also be low-cost, abundant resources, and foremost sustainable. Based on the advantages of carbon anode materials, a smart strategy to convert the used bamboo chopsticks into uniform carbon fibers (CFs) by using the abundant natural fibers in chopsticks after a simple hydrothermal treatment was proposed. Compared with graphite electrodes, bamboo-based CFs exhibits excellent electrochemical performance as a sustainable anode of LIBs. Moreover, the lithium storage performance of CFs can be further upgraded by integrating nanostructured molybdenum disulfide (MoS2) onto their surface by hydrothermal method to form the CFs/MoS2 composite with a core-shell structure. The electro-chemical results show that the CFs electrode cycled 500 times at a current density of 200 mA/g, has a specific discharge capacity of 381.1 mA·h/g. And the CFs/MoS2 composite electrode still maintains a specific discharge capacity of 843 mA·h/g at a high current density of 1000 mA/g for 1000 cycles.

     

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