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首页> 外文期刊>Advanced Functional Materials >Large Cumulative Capacity Enabled by Regulating Lithium Plating with Metal-Organic Framework Layers on Porous Carbon Nanotube Scaffolds
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Large Cumulative Capacity Enabled by Regulating Lithium Plating with Metal-Organic Framework Layers on Porous Carbon Nanotube Scaffolds

机译：通过在多孔碳纳米管支架上调节金属有机骨架层的锂电镀能够实现大的累积能力

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The high specific capacity of lithium metal is ideal to meet the current demand in rechargeable batteries but lithium dendrites and irreversible volume expansions are major hurdles. 3D lithium host materials can alleviate these problems by lowering the current density with large surface areas and accommodating lithium metal in their pores. However, lithium dendrites are persistently observed because of sluggish lithium-ion diffusion through tortuous pores, resulting in clogging and thereby dendrite growth. Herein, layered metal-organic frameworks (MOFs) are deposited on carboxylated carbon nanotube (CNT) scaffolds via coordination bonding. The MOF layer on the outside of the CNT scaffold has augmented lithium insertion into the porous scaffolds (24 mAh cm(-2) at 8 mA cm(-2)) and lithium plating/stripping lifetime (over 1700 h with 20 mAh cm(-2) cycle(-1)). MOF has pores large enough for lithium ions to permeate through, and its electronically insulating property creates capacitive effects, distributing lithium ions over the surface of the MOF layer to avoid dendrite growth and clogging during lithium plating. Outstanding volumetric and gravimetric capacities (approximate to 940 mAh cm(-3) and approximate to 980 mAh g(-1)) along with exceptional cumulative capacity (approximate to 4.9 Ah cm(-2)) are obtained. This promising approach can store lithium without dendrites to deliver high energy densities required for the current rechargeable batteries.
机译：锂金属的高比容量是满足充电电池中的当前需求，但锂枝晶和不可逆的体积膨胀是主要的障碍。通过降低具有大表面积的电流密度并在其孔中容纳锂金属来缓解这些问题。然而，由于通过曲折的孔隙沉积锂离子扩散而持续观察锂枝晶，导致堵塞并从而枝晶生长。这里，通过配位键合沉积层状金属 - 有机框架（MOF）沉积在羧化碳纳米管（CNT）支架上。 CNT支架外部的MOF层已经增强锂插入多孔支架（24mAhcm（-2），在8 mA cm（-2））和锂电镀/剥离寿命（超过1700小时，20mAh cm（ -2）循环（-1））。 MOF足够大的孔渗透到渗透物，并且其电子绝缘性能产生电容效果，在MOF层的表面上分布锂离子，以避免锂电镀期间的树突生长和堵塞。优异的体积和重力容量（近似为940mAh cm（-3），并近似于980 mah g（-1））以及卓越的累积容量（近似为4.9 ahcm（-2））。这项有前途的方法可以储存锂而没有树突的锂，以提供电流可充电电池所需的高能量密度。

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