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用于高压应用的氧化物阴极的结合交叉结合剂
Wenjun Ye1, Tianyu Wei1, Peng Chen1
1Jiangsu Key Laboratory of Materials and Technologies for Energy Storage, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China.
ACS applied materials & interfaces
|August 22, 2025
概括
一种基于水的新型粘合剂 - - 硫酸 (SL-GG) 提高了高电压下氧化物 (LCO) 阴极的稳定性. 这种粘合剂提高了先进电池应用的循环性能和容量保留.
科学领域:
- 材料科学
- 电化学
- 聚合物化学
背景情况:
- 高电位的氧化物 (LCO) 阴极的循环容量有限,限制了更高工作电压电池的开发.
- 开发高压离子电池的稳定阴极材料对于提高能量密度和性能至关重要.
研究的目的:
- 开发一种新的以水为基础的粘合剂,用于增强循环稳定的高电位LiCoO2阴极.
- 通过使用4.6V的新SL-GG粘合剂,研究LiCoO2阴极的结构完整性和电化学性能.
主要方法:
- 使用硫酸盐 (SL) 和瓜尔 (GG) 制备水性粘合剂 (SL-GG).
- 使用SL-GG粘合剂制造LiCoO2阴极,并使用现场X射线衍射 (XRD) 进行表征.
- 电化学测试,包括循环稳定性和4.6V和5C的特定放电容量测量.
主要成果:
- 由于SL和GG之间的结,SL-GG粘合剂具有高拉伸强度,可伸缩性和广泛的氧化潜力窗口.
- 在现场XRD分析证实了4.6V的LiCoO2与SL-GG结合剂的结构完整性,其性能优于PVDF.
- 在4.6V的100个循环后,SL-GG@LCO阴极实现了76.9%的容量保留,明显高于PVDF@LCO (42.8%),并且在5C时达到143.1mAh的特异性放电容量.
结论:
- 在高工作电压下,SL-GG粘合器有效地保护LiCoO2结构,使其在4.6V下稳定运行.
- 这种以水为基础的粘合剂在高性能离子电池中的实际应用具有显著的潜力.
- 这些发现突显了粘合剂工程对于高压正极材料的发展的重要性.
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