优秀的聚合离子-液体基凝聚合物电解质,通过分子结构设计和离子衍生界面层实现
Lingwang Liu1,2, Jiangyan Xue2, Yang Liu1,2
1School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei 230026, China.
ACS applied materials & interfaces
|February 13, 2024
概括
这项研究开发了一种新型的聚合离子液体凝聚合物电解质 (GM-GPE),可增强离子导电性并抑制树突. 这一突破提供了更安全,更高性能的金属电池,其稳定性和寿命得到了改善.
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:
- 基于聚合离子液 (PIL) 的凝聚合物电解质 (GPEs) 提供安全性和稳定性,但具有较低的离子导电性.
- 开发具有高离子导电性的GPE对于先进的储能应用,特别是金属电池至关重要.
研究的目的:
- 设计和合成一种基于PIL的新型GPE,具有增强的离子导电性和树抑制能力.
- 通过先进的电解质开发来提高金属电池的性能和安全性.
主要方法:
- 合成了一种具有长,灵活侧链的新型离子液体单体.
- 通过将单体与LiTFSI和塑化剂 (MEMPTFSI) 混合,制备了一个GPE (GM-GPE).
- 描述了GM-GPE的离子导电性,电化学稳定性,热稳定性和树抑制特性.
主要成果:
- 该GM-GPE实现了高环境离子导电性 (4.3 × 10−4 S cm−1在30°C).
- 证明了强大的电化学和热稳定性,不易燃性和优异的树抑制.
- 在一个LiFePO4子GM-GPE子Li电池中实现了高放电容量 (150 mA h g-1),具有良好的循环稳定性和速率能力.
结论:
- 基于PIL的新型GPE (GM-GPE) 显著提高了离子运输和离子沉积的均性.
- 开发的GM-GPE为高性能,安全和长周期的无树脂金属电池提供了有前途的途径.
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