Wenshuo Shang, Qiang Li, Fuyi Jiang, Bingkun Huang, Jisheng Song, Shan Yun, Xuan Liu, Hideo Kimura, Jianjun Liu, Litao Kang
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引用次数: 36
摘要
本质安全型锌I2电池是取代传统铅酸电池的主要候选电池之一,但由于锌阳极上不受控制的I3−穿梭和动态寄生反应,其货架寿命和循环寿命仍然很短。考虑到几乎所有这些有害过程都终止于锌阳极表面,在锌阳极表面修饰保护层应该是抑制这些过程最直接和彻底的方法之一。本文设计了一种基于易溶沸石的阳离子交换保护层,以全面抑制Zn阳极上的不利寄生反应。沸石晶格中的负电荷空腔为Zn2+提供了高度可达的迁移通道,同时阻挡了阴离子和电解质的通过。这种低成本的阳离子交换保护层可以同时抑制自放电、阳极腐蚀/钝化和Zn枝晶生长,使Zn| I2电池具有超长循环寿命(在2 A g−1条件下5600次循环后容量保持率为91.92%)、高库仑效率(平均99.76%)和大容量(0.2 A g−1条件下203-196 mAh g−1)。这项工作为构建高性能锌- i2水性电池提供了一种经济实惠的方法。
Boosting Zn||I2 Battery’s Performance by Coating a Zeolite-Based Cation-Exchange Protecting Layer
The intrinsically safe Zn||I2 battery, one of the leading candidates aiming to replace traditional Pb-acid batteries, is still seriously suffering from short shelf and cycling lifespan, due to the uncontrolled I3−-shuttling and dynamic parasitic reactions on Zn anodes. Considering the fact that almost all these detrimental processes terminate on the surfaces of Zn anodes, modifying Zn anodes’ surface with protecting layers should be one of the most straightforward and thorough approaches to restrain these processes. Herein, a facile zeolite-based cation-exchange protecting layer is designed to comprehensively suppress the unfavored parasitic reactions on the Zn anodes. The negatively-charged cavities in the zeolite lattice provide highly accessible migration channels for Zn2+, while blocking anions and electrolyte from passing through. This low-cost cation-exchange protecting layer can simultaneously suppress self-discharge, anode corrosion/passivation, and Zn dendrite growth, awarding the Zn||I2 batteries with ultra-long cycle life (91.92% capacity retention after 5600 cycles at 2 A g−1), high coulombic efficiencies (99.76% in average) and large capacity (203–196 mAh g−1 at 0.2 A g−1). This work provides a highly affordable approach for the construction of high-performance Zn-I2 aqueous batteries.
期刊介绍:
Nano-Micro Letters is a peer-reviewed, international, interdisciplinary and open-access journal that focus on science, experiments, engineering, technologies and applications of nano- or microscale structure and system in physics, chemistry, biology, material science, pharmacy and their expanding interfaces with at least one dimension ranging from a few sub-nanometers to a few hundreds of micrometers. Especially, emphasize the bottom-up approach in the length scale from nano to micro since the key for nanotechnology to reach industrial applications is to assemble, to modify, and to control nanostructure in micro scale. The aim is to provide a publishing platform crossing the boundaries, from nano to micro, and from science to technologies.