通过在铜箔上丝网印刷网格状二氧化硅,实现超长寿命锂金属阳极的电活性/惰性双功能结构

IF 10.7 Q1 CHEMISTRY, PHYSICAL
EcoMat Pub Date : 2024-06-30 DOI:10.1002/eom2.12478
Dongdong Li, Yue He, Bin Chen, Qingyi Liu, Jun Xu, Shengchen Yang, Wen-Yong Lai
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引用次数: 0

摘要

三维(3D)电流收集器(CC)已成为抑制枝晶和确保锂(Li)金属阳极安全的有效策略。然而,现有的三维集电体通常太重(通常为几十毫克厘米-2)或太厚(几十到几百微米),使得大规模生产和进一步应用面临挑战。此外,使用单组分三维 CC,无论是电活性还是惰性,对稳定锂阳极的效果都很有限。在这里,我们提出了一种可扩展的丝网印刷技术,在铜箔上合成超轻(约 0.4 mg cm-2)、超薄(约 0.54 μm)的二氧化硅网格,通过形成电活性/惰性双功能结构来调节垂直电场和锂离子浓度。这项技术打破了传统 3D CC 在材料/制造成本、重量、厚度,特别是大规模制造的可扩展性方面的限制。通过使用这种双功能结构,我们的 Cu@SiO2 网格 CCs(约 8.31 mg cm-2)比原来的 Cu 箔 CCs(约 8.85 mg cm-2)更轻,实现了没有锂枝晶的超光滑阳极表面,从而在 1 mA cm-2 电流条件下实现了超过 1500 小时的超长循环寿命。组装后的金属锂电池在 1 摄氏度条件下循环 400 次以上可保持约 80% 的容量,在 5 摄氏度条件下循环 250 次以上可保持约 76% 的容量,显示出三维 CC 在实际应用中的广阔前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Electrically active/inert dual-function architecture enabled by screen printing grid-like SiO2 on Cu foil for ultra-long life lithium metal anodes

Electrically active/inert dual-function architecture enabled by screen printing grid-like SiO2 on Cu foil for ultra-long life lithium metal anodes

Electrically active/inert dual-function architecture enabled by screen printing grid-like SiO2 on Cu foil for ultra-long life lithium metal anodes

Three-dimensional (3D) current collectors (CCs) have emerged as an effective strategy to inhibit dendrites and ensure the safety of lithium (Li) metal anodes. However, existing 3D CCs are generally too heavy (typically tens of mg cm−2) or too thick (tens to hundreds of micrometers), making large-scale production and further application challenging. Additionally, the use of single-component 3D CCs, whether electrically active or inert, only exhibits limited effects on stabilizing Li anodes. Here, we present a scalable screen-printing technique for the synthesis of ultralight (~0.4 mg cm−2) and ultrathin (~0.54 μm) SiO2 grids on Cu foil to regulate both the vertical electric field and Li-ion concentration by forming an electrically active/inert dual-function architecture. This technology breaks the limitations of traditional 3D CCs in material/fabrication costs, weight, thickness and especially, scalability for large-scale fabrication. By using this dual-function architecture, our Cu@SiO2-grid CCs (~8.31 mg cm−2), which are even lighter than the original Cu-foil CCs (~8.85 mg cm−2), realize an ultra-smooth anode surface without Li dendrites, and thus leads to an ultra-long cyclic life of over 1500 h at 1 mA cm−2. The assembled Li metal batteries demonstrate excellent capacity retention of ~80% over 400 cycles at 1 C and ~ 76% over 250 cycles at 5 C, which highlight the promising 3D CCs for practical applications.

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CiteScore
17.30
自引率
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