优化Si─O结合以提高低温可充电离子电池的接口动力学
Yiwen Wang1, Jie Liu2,3, Haoqing Ji1
1Collaborative Innovation Center of Suzhou Nano Science and Technology, College of Energy, Soochow University, Suzhou, 215006, China.
Advanced materials (Deerfield Beach, Fla.)
|November 21, 2024
概括
新型的西洛溶剂使得在极寒条件下高性能离子电池 (LIB) 成为可能. 这些电解质提高了电压稳定性和离子导电性,这对于要求低温应用至关重要.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 离子电池 (LIB) 需要先进的电解质,用于高压和广泛的温度应用.
- 目前的化溶剂面临成本,环境影响和低温性能等挑战.
- 对新型电解质溶剂的需求非常大,这些溶剂可以提高低温功能和高压稳定性.
研究的目的:
- 识别和开发一种新的溶剂类别 - - 酸盐,用于低温 (LT) 和高压LIB应用.
- 调查西洛分子结构,溶解动力学和界面特性之间的关系.
- 为了评估在恶劣条件下LIBs中的基于西洛的电解质的电化学性能.
主要方法:
- 素溶剂的战略分子键设计.
- 在Si-O键中分析d-p结合,以了解电压电阻和Li+相互作用.
- 调节Si-O结合键以控制离子聚合和溶解结构.
- 制造和测试使用西洛电解质制造的石墨底下电池NCM811袋.
主要成果:
- 锡洛溶剂表现出增强的电压阻力和由于Si-O d-p结合而减弱的Li+溶剂相互作用.
- 控制的Si-O结合导致LiF和Si-O丰富的接口层,促进快速的Li+导电.
- 一个石墨状的DCDCDCNCM811袋式电池在-50°C达到75.1%的容量保留,在-40°C达到67.6%的可逆充电容量.
- 在-20°C观察到良好的循环稳定性,展示了电解质的强度.
结论:
- 基于西洛的电解质对在极端寒冷和高压条件下运行的LIBs来说是一个有希望的进步.
- 锡洛的分子设计为设计界面性质和增强离子传输提供了一条途径.
- 这项研究为开发下一代LIB电解质提供了宝贵的见解,用于苛刻的应用.
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