紧型固体电解质接口实现,采用表面修改填充剂,用于长期使用,高性能全固态金属电池.
Hasan Jamal1, Firoz Khan2, Ji Hoon Kim3
1Division of Energy Technology, Daegu Gyeongbuk Institute of Science & Technology, 333, Techno Jungang-Daero, Hyeonpung-Myeon, Dalseong-Gun, Daegu, 42988, Republic of Korea.
Small (Weinheim an der Bergstrasse, Germany)
|July 5, 2024
概括
这项研究引入了复合聚合物电解质的表面功能化二氧化 mesoball填充剂,通过增强固体电解质接口 (SEI) 来显著提高金属电池的稳定性和效率. 这种新材料表现出卓越的离子导电性和循环性能.
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
- 聚合物科学 聚合物科学
背景情况:
- 基于聚合物的金属电池面临着由于电解质分解而导致低库伦比效率和低循环稳定性的挑战.
- 提高固体电解质接口 (SEI) 的稳定性对于减轻这种分解和提高电池性能至关重要.
研究的目的:
- 开发一种新的复合聚合物电解质 (MSMB-CPE),使用表面功能化二氧化 mesoball填充剂.
- 研究这些填充剂对SEI稳定性,离子导电性和金属电池的整体性能的影响.
主要方法:
- 复合聚合物电解质 (MSMB-CPE) 的制造,使用表面功能化二氧化 mesoball 填充剂.
- 分子动力学模拟用于研究离子解离能和填充剂-电解质相互作用.
- 电化学测试包括离子导电性,转移数,对称细胞性能和完整细胞循环.
主要成果:
- 表面修改确保了统一的填充剂分布,提供了大面积和易斯酸位.
- 模拟显示,与没有填充剂的电解质相比,填充剂中的LiTFSI的解离能量高出四倍.
- MSMB-CPE具有30倍高的扩散率,在60°C时的离子导电率为1.16 × 10−2 S cm−1,离子转移数为0.81.
- 在高电流密度 (200μA cm−2 @60 °C) 下,稳定的对称电池性能超过5000小时.
- 在700个循环后,在一个[Li/MSMB-CPE/LiFePO4]完整电池中保持85.60%的容量.
- 组合分析显示了一层平滑的SEI层,副产品较少.
结论:
- 表面功能化的二氧化 mesoball 填充剂有效地提高了 SEI 在聚合物电解质中的稳定性.
- 开发的MSMB-CPE为金属电池提供了显著改善的离子导电性,离子传输和循环稳定性.
- 这种方法为开发高性能和稳定的聚合物基金属电池提供了有前途的战略.
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