在离子电池中的高压阴极中,探索甲聚乙烯作为高性能替代粘合剂
Kai Yang1,2, Keding Chen1,2, Xingdi Zhang3
1State Key Laboratory of Precision Blasting, Jianghan University, Wuhan, 430056, China.
Small (Weinheim an der Bergstrasse, Germany)
|July 20, 2024
概括
新的聚乙烯结合剂克服了用于高压氧化 (LCO) 电池的聚乙烯化物 (PVDF) 的局限性. 这些结合剂提高了循环稳定性和速率性能,为高能量密度电池开发铺平了道路.
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
- 电池技术 电池技术
背景情况:
- 聚乙烯化物 (PVDF) 由于其电化学稳定性,是高压阴极材料的常规粘合剂.
- PVDF具有缺点,包括粘合性差,离子导电性有限,以及与有关的环境问题.
- 现有的粘合剂难以满足先进的高压电池化学的需求,例如氧化 (LCO).
研究的目的:
- 为了解决PVDF在高压氧化 (LCO) 电池中的局限性.
- 开发具有增强电化学稳定性和附着性的新型粘合材料.
- 通过先进的粘合剂选择,提高LCO阴极的循环和速率性能.
主要方法:
- 将甲烯聚乙基 (PEK-C) 和甲烯聚硫 (PES-C) 作为粘合剂材料进行整合.
- 评估新结合剂的电化学氧化阻力和粘附性质.
- 对阴极-电解质接口和离子导电性的分析.
主要成果:
- 与PVDF相比,聚乙烯结合剂 (PEK-C,PES-C) 显示出优越的电化学氧化抵抗和粘附性.
- 这些结合物形成了一个快速的离子导电复合层,减轻了不利的阴极-电解质接口反应.
- 带有聚乙烯结合剂的电池在分别在4.5V和4.6V的200个和500个循环后实现了88.92%和80.4%的容量保留.
结论:
- 甲烯聚乙烯结合剂为高压LCO电池提供了PVDF的可行替代品.
- 开发的结合剂显著提高了电池循环稳定性和性能.
- 这种方法为设计下一代高能量密度电池材料提供了一个有希望的策略.
相关概念视频
01:17Ion Exchange
572
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
572
03:12Batteries and Fuel Cells
27.2K
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
27.2K
01:20Anionic Chain-Growth Polymerization: Overview
2.1K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.1K