Atomic layer deposition of ZnO on carbon black as nanostructured anode materials for high-performance lithium-ion batteries
Atomic layer deposition of ZnO on carbon black as nanostructured anode materials for high-performance lithium-ion batteries
复制标题
炭黑上原子层沉积 ZnO 作为高性能锂离子电池纳米结构负极材料
DOI：
10.1039/c6nr07868k
复制
发表时间：
2017-01-21
期刊：
影响因子：
6.7
通讯作者：
Qin, Wei
中科院分区：
文献类型：
--
作者：
Lu, Songtao;Wang, Huanhuan;Qin, Wei
虽然氧化锌（ZnO）是一种低成本且天然丰富的材料，具有987 mA h g（-1）的高理论比容量用于容纳锂离子，但其作为阳极材料的应用受到其快速容量衰减的阻碍，这主要是由于重复充放电循环时的大体积变化（约228%）。本文以炭黑（CB）粉末为载体，采用原子层沉积（ALD）法成功制备了ZnO-炭黑（ZnO-CB）纳米复合材料。这种方法能够在ZnO纳米团簇和碳表面之间产生强界面分子结合，在锂化和脱锂过程中提供稳定和稳健的电接触，以及富含氧空位（OV）的ZnO纳米团簇，用于更快的锂离子传输。总的来说，纳米复合材料能够在100 mA g（-1）下提供2096 mA h g（-1）ZnO的高放电比容量，并且在500次循环后保持1026 mA h g（-1）ZnO的比容量的稳定循环稳定性。该复合材料还具有优异的倍率性能，以及在2000 mA g（-1）下在1080 mA h g（-1）的高可逆容量。本工作中所展示的用于生产富含OV的纳米结构和通过界面分子结合具有强耦合的纳米复合材料的简便但独特的合成方法可以扩展到其他氧化物基负极材料的合成，因此对于开发高能量密度锂离子电池具有普遍意义。
Although zinc oxide (ZnO), a low-cost and naturally abundant material, has a high theoretical specific capacity of 987 mA h g(-1) for hosting lithium ions, its application as an anode material has been hindered by its rapid capacity fading, mainly due to a large volume change (around 228%) upon repeated chargedischarge cycles. Herein, using carbon black (CB) powder as a support, ZnO-carbon black (denoted as ZnO-CB) nanocomposites were successfully fabricated using the atomic layer deposition (ALD) method. This method was able to produce strong interfacial molecular bindings between ZnO nanoclusters and the carbon surface that provide stable and robust electrical contact during lithiation and delithiation processes, as well as ZnO nanoclusters rich in oxygen vacancies (OVs) for faster Li-ion transport. Overall, the nanocomposites were able to deliver a high discharge specific capacity of 2096 mA h g(-1) ZnO at 100 mA g(-1) and stable cyclic stability with a specific capacity of 1026 mA h g(-1) ZnO maintained after 500 cycles. The composites also have excellent rate capability, and a reversible capacity at a high 1080 mA h g(-1) ZnO at 2000 mA g(-1). The facile but unique synthesis method demonstrated in this work for producing nanostructures rich in OVs and nanocomposites with strong coupling via interfacial molecular bindings could be extended to the synthesis of other oxide based anode materials and therefore could have general significance for developing high energy density lithium ion batteries.