一种具有分层应力消散和高离子导电性的三重交联结合剂,用于离子电池中的高级阳极
Yang He1, Feng Zhou1, Yingxi Zhang1,2
1Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|July 20, 2024
概括
一种新的三重交联网络 (TCN) 绑定器增强了用于高能离子电池的阳极. 这种结合剂提高了结构稳定性和离子导电性,克服了.
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:
- (Si) 阳极为离子电池提供高能量密度.
- 阳极由于在化/脱过程中体积变化很大,因此循环稳定性不佳.
- 这导致电极退化和容量衰减.
研究的目的:
- 为阳极开发一种强大的粘合剂,以提高机械完整性和电化学性能.
- 调查三重交联网络 (TCN) 粘合剂在减轻Si阳极降解中的作用.
- 为了改善阳极内的离子导电性和离子传输.
主要方法:
- 在现场化学交联聚烯酸 (PAA) 和胺 (MA) 形成TCN结合物.
- 结合物的相互作用 (键,静电键,共价胺键) 和应力消散性质的表征.
- 用TCN结合剂对Si阳极进行电化学测试,包括循环性能,速率能力和离子导电性测量.
主要成果:
- TCN粘合剂对Si具有强大的粘附性和有效的等级应力消散.
- 获得了高离子导电性 (1.2 × 10−4 S cm−1) 和 Li+ 转移数 (0.63).
- Si-TCN阳极在高质量负载 (2 mg cm-2) 时提供了 2268 mAh g-1 的特定容量,在 5 A g-1 时保持了 1673 mAh g-1 ,并在 1 A g-1.1 时显示了 250 个周期的稳定循环.
结论:
- TCN粘合剂显著提高了阳极的动态结构稳定性.
- 粘合剂的特性使有效的Li+运输和高电化学性能成为可能.
- 这项工作为开发高能量密度基电池提出了一个有前途的战略.
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