Graphene/Co9S8 nanocomposite paper as a binder-free and free-standing anode for lithium-ion batteries
Graphene/Co9S8 nanocomposite paper as a binder-free and free-standing anode for lithium-ion batteries
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石墨烯/Co9S8纳米复合纸作为锂离子电池的无粘合剂自支撑阳极
DOI：
10.1039/c5ta06158j
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发表时间：
2015-11
影响因子：
11.9
通讯作者：
Qin Wei
中科院分区：
文献类型：
--
作者：
Wang Huanhuan;Lu Songtao;Chen Yan;Han Lu;Zhou Jia;Wu Xiaohong;Qin Wei
具有高能量密度的柔性锂离子电池由于其在柔性电子器件中的潜在应用而近来受到极大的关注。本文中，我们报道了一种简单的高能球磨技术与真空过滤一起制备具有高电导率（121 S cm-1）的高度柔性、导电、坚固和独立的RGO/Co9S8纳米复合材料纸。抗拉强度(50.4 MPa）和杨氏模量（3.5GPa），其可以直接用作柔性LIB的独立阳极，而无需粘合剂、导电剂和金属集流体。具有66.7wt%Co9S8的高质量活性材料负载的自立式RGO/Co9S8阳极可以提供1415mA h gCo9S8.1（944mA h gelectrode 1）的高比容量。并保持573 mA h gCo9S8.1（382.2 mA h gelectrode1.）在1C的电流密度下500次循环后（1C/4545 mA g-1）。更重要的是，通过引入RGO，提高了速率性能。RGO/Co9S8阳极表现出令人印象深刻的容量为.1096.70 mA h gCo9S8.1，当电流恢复到0.1C时，容量恢复率为69.4%。这些结果表明，良好设计的纳米复合材料作为柔性LIB的阳极具有很大的潜力。据我们所知，这种改善的电化学性能可以归因于纳米尺寸的Co9S8颗粒（直径为25 nm）均匀地分散在高导电性的石墨烯片表面，这是由于研磨冲击应力可以获得的，从而增强了表面电化学反应性并缩短了锂离子和电子的传输长度。更重要的是，石墨烯片的大比表面积使得Co9S8能够均匀分布，并且提供了在重复充电/放电循环期间更好地适应Co9S8的体积膨胀/收缩的能力。
Flexible lithium ion batteries with high energy density have recently received tremendous interest due to.their potential applications in flexible electronic devices. Herein, we report a simple high energy ballmilling.technique together with vacuum filtration to fabricate a highly flexible, conductive, robust and.free-standing RGO/Co9S8 nanocomposite paper with high conductivity (121 S cm1.), tensile strength.(50.4 MPa) and Young's modulus (3.5 GPa) which can be directly used as a free-standing anode for.flexible LIBs without binders, conducting agents and metallic current collectors. The free-standing RGO/.Co9S8 anode with a high mass active material loading of 66.7 wt% Co9S8 can deliver a high specific.capacity of 1415 mA h gCo9S8.1 (944 mA h gelectrode1.) and maintain 573 mA h gCo9S8.1 (382.2 mA h.gelectrode1.) after 500 cycles at a current density of 1C (1C ¼ 545 mA g1.). More importantly, the rate.capability was improved by introducing RGO. The RGO/Co9S8 anode exhibited impressive capacities of.1096.70 mA h gCo9S8.1 with a capacity recuperability of 69.4% as the current returned to 0.1C. These.results demonstrate that the well designed nanocomposite is of great potential as an anode for flexible.LIBs. As far as we know, such improved electrochemical performance can be attributed to the nanosized.Co9S8 particles with a diameter of 25 nm homogeneously dispersed on the surface of high conductive.graphene sheets that can be obtained owing to the milling impact stress, which enhances surface.electrochemical reactivity and shortens the transport length of lithium ions and electrons. What's more,.the large specific surface area of the graphene sheet enables the uniform distribution of Co9S8 and.offers better ability to accommodate volume expansion/shrinkage of Co9S8 during repeated charge/.discharge cycles..
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