机械上坚固的聚胺结合剂实现了离子电池中微阳极的稳定和高电化学性能
Xiaoxiao Liang1, Binjie Zhang1, Niaz Ahmad1
1School of Chemistry and Chemical Engineering, Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, Collaborative Innovation Center of Ecological Civilization, Hainan University, No 58, Renmin Avenue, Haikou, 570228, China.
ChemSusChem
|October 10, 2024
概括
一种新型的聚胺粘合剂PI-CF3通过提高机械稳定性和接口完整性来增强离子电池的阳极. 这种结合剂有效地减轻了体积变化,为先进的能源存储提供了更高的容量和更长的循环寿命.
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:
- 阳极为离子电池提供了高的理论容量,但在循环过程中遭受了显著的体积膨胀和副作用.
- 有效的结合剂对于减轻应力和保持基于的阳极中的电极完整性至关重要.
研究的目的:
- 为微粒阳极开发一种具有三甲基和基组的机械强聚胺结合剂 (PI-CF3).
- 研究粘合剂提高阳极的电化学性能和循环稳定性的能力.
主要方法:
- 一种新型聚胺结合剂 (PI-CF3) 的合成,其中包含 -CF3 和 -OH 功能组.
- 结合剂的机械性能 (模量) 和电极形态的表征.
- 使用PI-CF3结合剂对微Si阳极进行电化学测试,包括容量保留和循环稳定性分析.
主要成果:
- PI-CF3粘合剂表现出高的扬氏模量 (~921.1 MPa),为阳极提供了出色的机械弹性.
- -OH和-CF3组促进了与表面的相互作用,形成了一个稳定的交叉连接网络,并改善了接口稳定性.
- 带PI-CF3结合剂的微Si阳极实现了1838 mAh g−1的初始特异性容量,在高质量负载 (0.78 mg cm−2) 的330个周期后保持了1219 mAh g−1,低容量衰变率为0.061%每周期.
结论:
- 开发的PI-CF3结合剂有效地稳定了阳极结构,并促进了Li+运输,克服了阳极的关键局限性.
- 这种粘合剂显着有望提高下一代离子电池的性能和耐用性.
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