Boosting High-Voltage Practical Lithium Metal Batteries with Tailored Additives

IF 26.6 1区 材料科学 Q1 Engineering
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

Abstract

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.

Abstract Image

利用定制添加剂提高高压实用金属锂电池的性能。
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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来源期刊
Nano-Micro Letters
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.
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