基于乙二胺五酸的导电固体聚合物电解质阻碍树突,并赋予离子电池的抗氧化能力
Yuli Zang1, Muhammad Irfan2, Zeheng Yang1
1School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui, 230009, P. R. China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|August 9, 2024
概括
研究人员开发了一种新的固体聚合物电解质,用于离子电池,使用聚乙烯醇和乙烯胺酸. 这种材料为下一代储能提供了更高的安全性,导电性和稳定性.
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:
- 离子电池 (LIB) 中的有机液体电解质构成安全风险,并限制性能.
- 固体聚合物电解质 (SPEs) 提供了更安全的替代品,但往往患有低离子导电性和不稳定性.
- 开发具有成本效益和高性能的SPEs对于推进LIB技术至关重要.
研究的目的:
- 开发一种新的,灵活的导电性固体聚合物电解质 (CSPE),以实现更安全,更高效的LIB.
- 调查聚乙烯醇 (PVA) 和离子极化二乙烯二胺五酸 (P-DETP) 对电解质性质的协同作用.
- 评估开发的CSPE在不同阴极材料的LIB中的性能.
主要方法:
- 使用PVA和P-DETP合成一种新的CSPE.
- 描述CSPE的热力学稳定性和离子导电性.
- 密度函数理论 (DFT) 计算以了解离子运输机制.
- 使用LiFePO4和LiNi0.88Co0.06Mn0.06O2阴极在LIB中对CSPE进行电化学测试.
主要成果:
- 由于结合,PVA/P-DETP CSPE的热力学稳定性得到了提高.
- DFT计算证实P-DETP可以促进Li+解离和移动.
- 该CSPE实现了高离子导电率 (2.8 × 10−4 S cm−1),高电化学电位 (5.1 V) 和出色的转移数 (0.869).
- 在LiFePO4和高三元阴极中均表现出稳定的循环性能,这表明树抑制和改善了接口稳定性.
结论:
- 新的PVA/P-DETP CSPE为更安全,高性能LIB提供了一个有前途的解决方案.
- 该材料的性能适用于高能量密度的应用.
- 这一发展为固态LIBs的商业可行性铺平了道路.
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