制造用于高能电池的超轻超薄铜集流器

IF 42.9 Q1 ELECTROCHEMISTRY
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引用次数: 0

摘要

在快速发展的储能技术领域,提高电池级重力和体积能量密度对于实现高性能电池至关重要,这需要考虑电池的所有组件。传统的金属箔集电体(CC),尤其是阳极的铜(Cu)集电体,质量大、成本高,但对电池容量没有贡献。在最小厚度和理想机械强度的前提下减轻铜集电体的重量对提高能量密度至关重要,但在技术上却具有挑战性。在此,我们展示了一种基于无电解电镀的快速、可扩展的化学镀方法,用于在超薄聚乙烯(PE)聚合物支架(5 μm)上制造具有薄铜层(500 nm)的超轻 CC(1.72 mg cm)。这种超轻超薄 CC 具有高金属纯度、高机械强度、高热稳定性,在锂离子电池和锂金属电池系统中具有出色的电化学性能。我们的超轻 CC 重量仅为 6 μm 铜箔的 30%,在不牺牲体积能量密度的情况下,可将电池级重力能量密度提高 5-10%。此外,化学镀膜方法的简便性和可扩展性使其成为大规模生产超薄轻质电流收集器的理想解决方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Fabricating ultralight and ultrathin copper current collectors for high-energy batteries

Fabricating ultralight and ultrathin copper current collectors for high-energy batteries
Improving cell-level gravimetric and volumetric energy density is essential to achieve high-performance batteries in the rapidly evolving field of energy storage technology, which requires consideration of all cell components. Traditional current collectors (CCs) made of metal foil, especially the copper (Cu) current collector of the anode, possess high mass and cost yet do not contribute to capacity. Reducing the weight of Cu CC with minimum thickness and desirable mechanical strength is critical in enhancing energy density but is technically challenging. Herein, we demonstrate a fast and scalable chemical coating method based on electroless plating for fabricating ultralight CC (∼1.72 ​mg ​cm−2) with a thin Cu layer (500 ​nm) on an ultrathin polyethylene (PE) polymer scaffold (5 ​μm). The ultralight and ultrathin CC possesses high metal purity, high mechanical strength, high thermal stability, and outstanding electrochemical performances in lithium-ion and lithium-metal battery systems. Our ultralight CC only exhibits ∼30% of the weight of 6 ​μm Cu foil, leading to a 5−10% improvement in cell-level gravimetric energy density without sacrificing volumetric energy density. Moreover, the simplicity and scalability of the chemical coating method make it a promising solution for the mass production of ultra-thin and lightweight current collectors.
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CiteScore
33.70
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