Dendrite-Free Zinc Deposition Induced by Multifunctional CNT Frameworks for Stable Flexible Zn-Ion Batteries.,Advanced Materials

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Dendrite-Free Zinc Deposition Induced by Multifunctional CNT Frameworks for Stable Flexible Zn-Ion Batteries.
Advanced Materials ( IF 27.4 ) Pub Date : 2019-07-25 , DOI: 10.1002/adma.201903675
Yinxiang Zeng ₁ , Xiyue Zhang ₁ , Ruofei Qin ₁ , Xiaoqing Liu ₁ , Pingping Fang ₁ , Dezhou Zheng ₂ , Yexiang Tong ₁ , Xihong Lu _{1,

3}

Affiliation

The current boom of safe and renewable energy storage systems is driving the recent renaissance of Zn-ion batteries. However, the notorious tip-induced dendrite growth on the Zn anode restricts their further application. Herein, the first demonstration of constructing a flexible 3D carbon nanotube (CNT) framework as a Zn plating/stripping scaffold is constituted to achieve a dendrite-free robust Zn anode. Compared with the pristine deposited Zn electrode, the as-fabricated Zn/CNT anode affords lower Zn nucleation overpotential and more homogeneously distributed electric field, thus being more favorable for highly reversible Zn plating/stripping with satisfactory Coulombic efficiency rather than the formation of Zn dendrites or other byproducts. As a consequence, a highly flexible symmetric cell based on the Zn/CNT anode presents appreciably low voltage hysteresis (27 mV) and superior cycling stability (200 h) with dendrite-free morphology at 2 mA cm-2 , accompanied by a high depth of discharge (DOD) of 28%. Such distinct performance overmatches most of recently reported Zn-based anodes. Additionally, this efficient rechargeability of the Zn/CNT anode also enables a substantially stable Zn//MnO2 battery with 88.7% capacity retention after 1000 cycles and remarkable mechanical flexibility.

中文翻译：

多功能CNT框架诱导的用于稳定柔性锌离子电池的无枝晶锌沉积。

当前安全和可再生能源存储系统的繁荣推动了锌离子电池的近来复兴。但是，臭名昭著的尖端诱导的锌阳极上的枝晶生长限制了它们的进一步应用。在此，构成将柔性3D碳纳米管（CNT）框架构造为Zn电镀/剥离支架的第一个演示是为了实现无枝晶的坚固Zn阳极。与原始沉积的Zn电极相比，制成的Zn / CNT阳极具有较低的Zn核超电势和更均匀的分布电场，因此更有利于具有令人满意的库伦效率的高度可逆的Zn镀层/剥离，而不是形成Zn枝晶或其他副产品。作为结果，基于Zn / CNT阳极的高度灵活的对称电池呈现出明显的低电压滞后（27 mV）和卓越的循环稳定性（200 h），在2 mA cm-2时无枝晶形态，并伴随着高放电深度（DOD））的28％。这种独特的性能超过了最近报道的大多数基于锌的阳极。此外，Zn / CNT阳极的这种高效充电能力还可以实现基本稳定的Zn // MnO2电池，在1000次循环后容量保持率为88.7％，并且具有显着的机械柔韧性。

更新日期：2019-07-25

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