利用定制添加剂提高高压实用金属锂电池的性能。

IF 26.6 1区材料科学 Q1 Engineering Nano-Micro Letters Pub Date : 2024-07-29 DOI:10.1007/s40820-024-01479-1

Jinhai You, Qiong Wang, Runhong Wei, Li Deng, Yiyang Hu, Li Niu, Jingkai Wang, Xiaomei Zheng, Junwei Li, Yao Zhou, Jun-Tao Li

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引用次数: 0

摘要

锂（Li）金属阳极被广泛认为是高能量密度电池的理想阳极材料。然而，不受控制的锂枝晶生长往往会导致不利的界面和较低的库仑效率（CE），从而限制了其更广泛的应用。本文制备了一种醚基电解质（称为 FGN-182），通过掺入 LiFSI 和 LiNO3 作为双盐，展示了超稳定的锂金属阳极。双盐的协同效应促进了具有快速 Li+ 传输动力学的高稳定性 SEI 膜的形成。值得注意的是，Li||Cu 半电池的平均 CE 值高达 99.56%。特别是，配备了高负载氧化钴锂（LCO，3 mAh cm-2）阴极、超薄锂芯片（25 μm）和贫电解质（5 g Ah-1）的袋式电池表现出卓越的循环性能，在 125 个循环后仍能保持 80% 的容量。为了解决高电压下阴极中的气体问题，在 FGN-182 中加入了阴极添加剂 1,3,6-三氰基己烷；由此产生的高电压 LCO||Li (4.4 V) 袋式电池可以稳定地循环 93 个周期。这项研究表明，即使使用醚基电解质，通过探索阴极和阳极的适当功能添加剂，也可以同时显著提高锂的高利用率和电解质对高压的耐受性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Boosting High-Voltage Practical Lithium Metal Batteries with Tailored Additives

Highlights

FGN-182 electrolytes exhibit highly reversible Li plating/stripping with an average Coulombic efficiency reaching up to 99.56% determined from Auerbach’s test.
The gas-evolution process of LiNO₃ in high-voltage lithium cobalt oxide (LCO) cathodes is revealed by in situ differential electrochemical mass spectrometry.
Pouch cells equipped with high-loading LCO (3 mAh cm⁻²) cathodes, ultrathin Li chips (25 μm), and lean electrolytes (5 g Ah⁻¹) using optimized electrolyte (FGN-182 + 1%HTCN) demonstrate outstanding cycling performance.

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来源期刊

Nano-Micro Letters NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

32.60

自引率

4.90%

发文量

981

审稿时长

1.1 months

期刊介绍： Nano-Micro Letters is a peer-reviewed, international, interdisciplinary, and open-access journal published under the SpringerOpen brand. Nano-Micro Letters focuses on the science, experiments, engineering, technologies, and applications of nano- or microscale structures and systems in various fields such as physics, chemistry, biology, material science, and pharmacy.It also explores the expanding interfaces between these fields. Nano-Micro Letters particularly emphasizes the bottom-up approach in the length scale from nano to micro. This approach is crucial for achieving industrial applications in nanotechnology, as it involves the assembly, modification, and control of nanostructures on a microscale.