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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Facile synthesis of manganese oxide/aligned carbon nanotubes over aluminium foil as 3D binder free cathodes for lithium ion batteries
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Facile synthesis of manganese oxide/aligned carbon nanotubes over aluminium foil as 3D binder free cathodes for lithium ion batteries

机译：铝箔铝氧化物/取向碳纳米管的容纳合成3D粘合剂离子电池的3D粘合剂自由阴极

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Lithium ion batteries have attracted a lot of attention due to their high energy density, but they have relatively lower power density and poorer cyclic stability compared with supercapacitors. Manganese oxide is a promising electrode material for lithium ion batteries due to its low cost, low toxicity, high theoretical capacity, and wide availability. However, it suffers from serious capacity fading which impedes its commercial application. In this work, aligned carbon nanotubes (ACNTs) were grown directly over Al foil as 3D current collectors and then manganese oxide thin film was coated over ACNTs through a spontaneous reduction of potassium permanganate. The obtained 3D manganese oxide/ ACNT coaxial nanotube arrays on Al foils provide remarkable advantages such as the large surface area of the 3D thin manganese oxide layer, the very low electric resistance of the electrode, excellent lithium ion diffusion in the manganese oxide layer and in the channel between the tubes, and excellent elastic properties to tolerate the large volume changes during charge and discharge. As a result, a remarkable improvement of rate capability and stability of the lithium ion batteries was achieved. The 3D thin film electrodes can deliver a capacity of 308 mA h g~(-1) at 0.1 C which is identical to the theoretical capacity of 95 mA h g~(-1) at 20 C and maintain a capacity of 133 mA h g~(-1) after 100 cycles at 1 C. The continuous growth of a solid electrolyte interface (SEI) layer due to trace amounts of water remaining in the manganese oxide layers has been identified as the main cause of the capacity fading. The stability was improved but the initial capacity decreased with increasing annealing temperature in the inert gas.
机译：锂离子电池由于其高能量密度而引起了大量的关注，但与超级电容器相比，它们具有相对较低的功率密度和较差的循环稳定性。由于其低成本，低毒性，高理论容量和广泛可用性，锰氧化物是锂离子电池的有希望的电极材料。但是，它受到严重的能力衰落，阻碍了其商业申请。在这项工作中，将对准的碳纳米管（ACNT）直接在Al箔上生长，因为3D电流收集器，然后通过锰锰酸钾的自发减少涂覆锰氧化物薄膜。所获得的3D锰氧化物/ ACNT同轴纳米管阵列在Al箔上提供了显着的优点，例如3D薄锰氧化物层的大表面积，电极的非常低的电阻，锰氧化物层中的优异锂离子扩散，以及管之间的通道和优异的弹性特性以容忍充电和放电期间的大体积变化。结果，实现了锂离子电池的速率能力和稳定性的显着提高。 3D薄膜电极可以在0.1℃下提供308 mA Hg〜（-1）的容量，其在20℃下的95 mA Hg〜（-1）的理论容量相同，并保持133 ma Hg〜（ -1）在1℃下100次循环。由于锰氧化物层中残留的痕量水的固体电解质界面（SEI）层的连续生长已被鉴定为能力衰落的主要原因。稳定性得到改善，但初始容量随着惰性气体的增加温度而降低。

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