石墨烯
分离器(采油)
过电位
成核
材料科学
复合数
阳极
氧化物
法拉第效率
金属
化学工程
复合材料
纳米技术
冶金
化学
电极
电化学
有机化学
工程类
物理
物理化学
热力学
作者
Yanzhu Luo,Yi Yang,Yuanxue Tao,Dekang Huang,Bohan Huang,Hao Chen
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2021-11-17
卷期号:4 (12): 14599-14607
被引量:25
标识
DOI:10.1021/acsaem.1c03223
摘要
The issue of degraded reversibility of zinc-metal anodes resulting from dendrite formation and surface-originated side reactions is still a fundamental challenge for high-performance zinc-ion batteries (ZIBs). Herein, a graphene oxide (GO) nanosheet-modified cellulose acetate (CA) separator is developed with an ultralow mass loading of 4 μg cm–2 by a simple and low-cost filtration method. The low lattice mismatch of GO with Zn metal and numerous hydrophilic O-containing groups of GO enable the uniform Zn nucleation and the following epitaxial electrodeposition along the (002) plane, leading to a dendrite-free surface. Significantly, the surface chemistry of GO is important as the hydrophilic O-containing groups act as the initial nuclei deposition sites, which would grow larger along the parallel direction in the subsequent process. This CA/GO composite separator elevates the symmetric cell lifespan to 500 h at a high current density of 10 mA cm–2 (1 mA h cm–2). Moreover, a smaller nucleation overpotential (89 mV at 1 mA cm–2) and excellent Coulombic efficiency (higher than 96%) can also be realized. Furthermore, such a separator engineering enables an improved cycling performance for hydrated VO2/CC||Zn batteries. This separator modification method provides a pathway for the development of high-performance ZIBs and expands their application in other metal-related energy devices suffering from irreversibility.
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