分子工程使得高初始库伦比效率和Rubost固体电解质间相为离子电池中的硬碳
Yu Sun1, Ruilin Hou1, Sheng Xu1
1College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, National Laboratory of Solid-State Microstructures, Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
Angewandte Chemie (International ed. in English)
|January 10, 2024
概括
在硬碳 (HC) 上设计的二甲 (DP) 稳定了固体电解质间相 (SEI),显著提高了离子电池的初始库伦比效率 (ICE).
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 硬碳 (HC) 是离子电池 (SIB) 的一个有前途的阳极.
- 然而,不稳定的固体电解质间相 (SEI) 形成和低初始库伦比效率 (ICE) 阻碍了其商业化.
- 迫切需要一个新的战略来克服这些局限性.
研究的目的:
- 开发一种分子设计策略,以提高SIB中的HC阳极的性能.
- 为了提高SEI层的稳定性和增加HC阳极的ICE.
- 为了证明改造HC材料的实际应用潜力.
主要方法:
- 在硬碳 (HC) 的表面上工程化二甲 (DP),以创建DP-HC.
- 研究了DP-HC上的SEI层特性,包括不同电解质的厚度和稳定性.
- 评估了DP-HC在SIB中的电化学性能,包括ICE和自行车稳定性.
- 组装并测试了一个Na3V2(PO4)3 (NVP) 水DP-HC全细胞.
主要成果:
- 在DP-HC上形成了一个稳定和超薄 (≈7.4nm) 的SEI层,与和以太电解质兼容.
- 与纯HC (60.8%) 相比,DP-HC在Diglyme (G2) 电解质中的NaPF6中显著改善了ICE (>96.3%).
- DP-HC表现出极好的循环稳定性,在0.5A g-1.1下保持了超过1600个循环的性能.
- 全电池的NVPgadgadgadDP-HC实现了98.3%的异常ICE和450个周期的稳定循环.
结论:
- 工程DP到HC的分子设计策略有效地解决了SIB中的SEI不稳定性和低ICE.
- 作为用于实际SIB应用的高性能阳极材料,DP-HC非常有前途.
- 这种方法为推进SIB技术中的HC商业化提供了有价值的途径.
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