锂离子电池柔性负极材料CoO纳米线@C/碳布复合材料

Carbon Coated CoO Nanowires Grown on Carbon Cloth as Flexible Binder-Free Lithium-Ion Battery Anodes

本文提出了一种简便、可规模化制备CoO纳米线@C/碳布(CC)复合材料的方法,该复合材料可用作无粘结剂锂离子电池负极。首先通过简单的水热和煅烧法制备了CoO纳米线@碳布复合材料,再通过葡萄糖溶液浸渍和煅烧获得具有三维立体结构的CoO纳米线@C/CC复合电极材料。碳包覆的CoO纳米线均匀地分散在碳布上,形成导电的碳网络。在碳布上原位生长的CoO纳米线可以有效缩短锂离子的转移路径,降低接触电阻。碳涂层厚度约为1 nm,显著抑制了锂离子嵌入/嵌出过程中活性材料的粉碎,以及CoO在电解液中的直接暴露。结果表明CoO纳米线@C/CC复合材料用作锂离子电池的无粘结剂负极时,具有良好的充放电性能和循环稳定性。电流密度为1 A·cm^(-2)时,200次循环后的比容量为863 mAh·cm^(-2)(容量保持率75.83%)。本研究为柔性锂离子电池负极材料的制备提供了一种可行的新选择。

A simple and scalable method for preparing CoO nanowire@C/carbon cloth(CC)composite materials is proposed in this paper,those composite materials can be used as the negative electrode of binderless lithium-ion batteries.Firstly,CoO nanowires@CC composite materials were prepared through simple hydrothermal and calcination methods,and then CoO nanowires@C/CC composite electrode materials with three-dimensional structure were obtained through glucose solution immersion and calcination.In the unique structure,carbon coated CoO nanowires uniformly disperse on carbon cloth forming a conductive carbon network.The hierarchical CoO nanowires in situ grown on the carbon cloth can effectively shorten the transfer paths of lithium ions and reduce the contact resistance.The thickness of carbon coating is about 1 nm.The carbon coating significantly inhibits the comminution of active materials during lithium ion insertion and extraction and the direct exposure of CoO to electrolyte.The results show that CoO@C/CC nanocomposites have excellent charge discharge performance and cycle stability when used as binder free negative electrode of lithium ion battery.At the current density of 1 A·cm^(-2),the specific capacity after 200 cycles is 863 mAh·cm^(-2)(capacity retention rate 75.83%).This study provides a feasible new choice for the cathode material of flexible lithium ion battery.