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基于聚烯利的triblock共聚合物结合剂,使得对LiNi_0.5Mn_1.5O₄和硫基电池的性能非常出色

Zhaokun Wang¹, Yan Zhang¹, Yanrui Pan¹

¹School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.

ACS applied materials & interfaces

|July 18, 2024

概括

一种新型的triblock共聚合物粘合剂,聚烯二甲基甲酸-烯酸无水化物 (PAMA),提高了离子电池的性能. PAMA 提高了高压旋 LiNi0.5Mn1.5O4 阴极的电极稳定性和容量保留.

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
聚合物化学聚合物化学

背景情况:

高能量密度的离子电池对于电动汽车和先进的电子产品至关重要.
螺旋LiNi0.5Mn1.5O4 (LNMO) 提供高电压和容量,但在高电位下遭受粘合剂降解.
传统的结合剂,如聚乙烯化物 (PVDF),其稳定性较差,导致容量衰减.

研究的目的:

开发一种新的粘合剂,以提高LNMO阴极的电化学性能和周期寿命.
为了研究一种新的triblock共聚合物粘合剂对电极完整性和电压电阻的影响.
为解决高压离子电池应用中常规结合剂的局限性.

主要方法:

溶液聚合被用来合成triblock聚烯-甲基甲基酸-烯酸化物 (PAMA) 结合剂.
将PAMA粘合剂的机械性能 (剥离强度) 与聚乙烯化物 (PVDF) 相比较.
对于使用PAMA和PVDF结合剂的LNMO阴极,评估了电化学性能,包括容量保留和周期寿命.

主要成果:

PAMA粘合剂的剥离强度明显高 (0.506 N cm-1) 超过PVDF (0.3 N cm-1).
使用PAMA结合剂的LNMO电极在800个循环后保持了70.7%的容量,而PVDF的容量为33.9%.
PAMA结合剂的极群促进了多硫化物吸附,抑制了硫改性电极 (S@PAMA) 中的穿效应.

结论:

PAMA粘合器为高压LNMO阴极提供了卓越的结合能量和电化学稳定性.
PAMA显著改善了离子电池的循环寿命和容量保留.
这本小说介绍了开发下一代高能量密度电池的有希望的战略.

关键词:

LiNi0.5Mn1.5O4 的高压阴极.硫电池是硫电池的一种.聚烯二基粘合剂是一种基于聚烯二的粘合剂.穿效应的穿效应三重块共聚化三重块共聚化

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