Atomic‐Layer‐Deposited Amorphous MoS2 for Durable and Flexible Li–O2 Batteries,Small Methods

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Atomic‐Layer‐Deposited Amorphous MoS2 for Durable and Flexible Li–O2 Batteries
Small Methods ( IF 10.7 ) Pub Date : 2019-05-29 , DOI: 10.1002/smtd.201900274
Ming Song _{1,

2} , Hua Tan _{2,

3} , Xianglin Li ₄ , Alfred Iing Yoong Tok ₄ , Pei Liang ₅ , Dongliang Chao ₂ , Hong Jin Fan ₂

Affiliation

Li–O₂ batteries (LOB) potentially have the highest specific capacity among all types of metal‐ion batteries but suffer severely from cycle instability and low energy efficiency. In this work, an integrated cathode is fabricated that contains an amorphous MoS₂ thin layer deposited on a 3D conductive carbon scaffold to improve the energy efficiency to ≈83% and cycle life up to 190 cycles. An advanced pressure‐tuned stop‐flow atomic layer deposition (ALD) method is employed to deposit a ≈5 nm thick amorphous MoS₂ layer on carbon nanotube forest‐covered graphite foam. It is established that this integrated 3D cathode exhibits high catalytic activity for both oxygen reduction reaction and oxygen evolution reaction. The benefit of the ALD MoS₂ in lowering the energy barrier is also supported by first‐principles calculations. Finally, quasi‐solid state flexible LOBs are also assembled that can be stably discharged up to 6 d. This new and rational design of cathode may provide a new direction for achieving high‐performance flexible Li–O₂ batteries.

中文翻译：

原子层沉积的非晶态MoS2，用于耐用且灵活的Li-O2电池

Li-O ₂电池（LOB）可能在所有类型的金属离子电池中具有最高的比容量，但会严重遭受循环不稳定和能源效率低的困扰。在这项工作中，制造出集成阴极，该阴极包含沉积在3D导电碳支架上的非晶MoS ₂薄层，以将能量效率提高到≈83％，循环寿命高达190个循环。先进的压力调整式停止流原子层沉积（ALD）方法用于在碳纳米管森林覆盖的石墨泡沫上沉积约5 nm厚的非晶态MoS ₂层。可以确定的是，这种集成的3D阴极对氧还原反应和氧释放反应均显示出高催化活性。ALD MoS ₂的好处第一性原理的计算也支持降低能垒。最后，还组装了准固态柔性LOB，可以稳定排放长达6 d。这种新颖合理的阴极设计可能为实现高性能柔性Li–O ₂电池提供新的方向。

更新日期：2019-05-29

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