基于双离子化的固体电解质,具有高离子导电性和高压稳定性.
Yuan Tan1, Jordan Gatts1, Chengyu Fu2
1Department of Materials Science and Engineering, University of Texas at Dallas, Richardson, Texas, 75080, USA.
Small (Weinheim an der Bergstrasse, Germany)
|May 22, 2025
概括
阳离子混合制造出一种新的化物基固态电解质 (SSE) 用于电池. 这种新材料具有增强的离子导电性和稳定性,为更安全,高性能固态电池 (SSB) 铺平了道路.
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
- 固态化学 固态化学
背景情况:
- 固态电池 (SSB) 是离子系统的有吸引力的替代品,原因是成本,安全性和能量密度优势.
- 对于SSB的关键挑战包括低离子导电性和固态电解质 (SE) 的界面不稳定性.
- 以化物为基础的SE是重点,但需要优化以提高性能.
研究的目的:
- 开发一种基于化物的高性能固态电解质 (SE) 用于固态电池 (SSB),采用离子混合战略.
- 研究用氧化物 (O2-) 代替部分化物 (Cl-) 对NaNbCl6基材料性能的影响.
- 在一个完整的SSB设备中评估新型电解质的电化学性能和稳定性.
主要方法:
- 合成一种基于化物的新型SE,NaNbxCl5x-1O (NNCO,x ≈ 1),通过用O2-. 替换Cl-通过离子混合.
- 合成的SE的离子导电性,激活能量和电化学稳定性的表征.
- 使用NNCO SE,合Na2 / 3Ni1 / 3Mn2 / 3O2阴极和Na2Sn阳极制造和测试一个完整的SSB设备.
主要成果:
- 与晶体NaNbCl6.6相比,玻璃色的NNCO SE显示了显著增强的Na+离子导电性 (>30°C时1.0mS cm-1),以及低的激活能量 (0.23 eV).
- 热处理NNCO (NNCO-HT) 显示了结构秩序的改善,同时保持了高离子导电性.
- 该NNCO SE表现出卓越的氧化稳定性 (高达4.3V与Na+/Na相比) 和与硫化物成分的化学兼容性. 完整的SSB实现了95mAhg-1的初始容量,具有出色的循环稳定性 (500个循环后80%的保留率,1000个循环后73%的保留率).
结论:
- 阳离子混合是一种有效的策略,可以增强化基SE的离子导电性和稳定性.
- 开发的NNCO SE为实现实用性,高性能固态电池提供了一个有前途的途径.
- 这项研究提供了一种可行的方法来克服当前基于的储能系统的局限性.
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