通过无微裂纹的阳离子网络聚合物膜协助加速选择性Li+运输,用于长周期金属电池
Jingyi Gao1, Jiaming Zhou1, Xiaodie Chen1
1Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, 999077, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|February 13, 2024
概括
研究人员开发了新的无微裂纹的聚合物膜,用于更安全,更持久的可充电金属电池. 这些膜防止了树的生长,并提高了电动汽车和能源存储的性能.
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:
- 可充电金属电池为电动汽车和电网存储提供高能量密度.
- 由于树突和固体电解质介相,安全问题和短周期寿命阻碍了它们的应用.
- 开发稳定高效的电解质对于推进金属电池技术至关重要.
研究的目的:
- 创建无微裂纹的离子网络聚合物膜,以提高金属电池的性能.
- 通过抑制树形成,解决安全问题并改善循环寿命.
- 为了研究聚合物电解质中绑定酸盐离子的特性和有效性.
主要方法:
- 使用简单的一步点击反应,合成无微裂纹的离子网络聚合物膜.
- 膜的特征是阴离子导电性,电化学稳定性窗口和树抗性.
- 使用这些膜的金属电池的性能在450个周期的高温下进行了评估.
主要成果:
- 在高温下,合成的膜表现出高阴离子导电性 (3.1 × 10−5 S cm−1) .
- 它们表现出广泛的电化学稳定性窗口 (高达5V) 和出色的不易燃性.
- 膜表现出显著的抵抗树突生长,导致 450 个周期的高容量保留 (92.7%) 和库伦比效率 (99.867%).
结论:
- 无微裂纹的离子网络聚合物膜与绑定的酸离子有效抑制树脂的生长.
- 这些膜使金属电池在高温下能够安全长时间运行.
- 开发的膜代表了高能量密度电池应用的重大进步.
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