Xiaowei Shi, Yan Zhang, Huandi Zhang, Zehua Zhao, Bihe Liu, Jiamei Liu, Xingchen Liu, Lei Li
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引用次数: 0
Abstract
The five volt-class battery is one promising candidate of high energy density lithium-ion batteries. However, it suffers from limited electrochemical performance due to many problems, one of which is Al current collector corrosion. The corrosion greatly affects the electrochemical performance of batteries, so uncovering the Al corrosion mechanism and developing its protection strategy in the 5 V-class battery becomes important. Here, we experimentally realize a corrosion-resistant Al current collector via graphene protection. The experimental and theoretical calculation indicate that graphene can work as a physical barrier to inhibit direct contact between LiPF6-based electrolyte and an Al current collector, reducing the side reactions between Al current collector and HF originated from electrolyte. What is more, graphene increases the Al corrosion reaction potential, raising the difficulty of electrochemical corrosion. These effects improve the electrochemical performance of the 5 V-class battery, especially the rate performance and cycling stability. The work is beneficial for the development of a 5 V-class battery.
五伏特级电池是高能量密度锂离子电池中很有前途的一种。然而,由于存在许多问题,它的电化学性能有限,其中之一就是铝集流器腐蚀。腐蚀极大地影响了电池的电化学性能,因此揭示铝腐蚀机理并制定 5 V 级电池的保护策略变得非常重要。在此,我们通过实验实现了石墨烯保护的耐腐蚀铝集流器。实验和理论计算表明,石墨烯可以作为物理屏障抑制基于 LiPF6 的电解液与铝集流器的直接接触,减少铝集流器与电解液中产生的 HF 之间的副反应。此外,石墨烯还能提高铝的腐蚀反应电位,增加电化学腐蚀的难度。这些效应改善了 5 V 级电池的电化学性能,尤其是速率性能和循环稳定性。这项工作有利于 5 V 级电池的开发。
期刊介绍:
Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including:
- Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale
- Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies
- Modeling and simulation of synthetic, assembly, and interaction processes
- Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance
- Applications of nanoscale materials in living and environmental systems
Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.