氧气调节的自发固体电解质间相使超稳定的固态Na金属电池成为可能
Keshuang Cao1, Yufan Xia1, Haosheng Li1
1School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China; ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou 311200, China.
Science bulletin
|November 16, 2023
概括
一个创新的氧气调节的固体电解质间相 (SEI) 增强了固态电池的稳定性. 这种方法防止了树的生长,使半固态电池能够保持超过6600小时的稳定循环和高容量保留.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 固态金属电池提供安全性和高能量密度.
- 在阳极-固体电解质 (SE) 界面的界面不稳定性导致树的透和电池故障.
- Na-Na3Zr2Si2PO12接口表现出一种不均的,高电阻的固体电解质接相 (SEI).
研究的目的:
- 开发一种氧气调节的SEI,以提高固态电池中阳极-SE接口的稳定性.
- 为了提高固态金属电池的循环稳定性和性能.
主要方法:
- 金属 (含微量氧) 和Na3Zr2Si2PO12SE之间发生的一种自发反应,形成一个受氧调节的SEI.
- 对称细胞的制造和测试,以评估涂/剥离的稳定性.
- 准固态电池的组装和循环使用Na3V2(PO4) 3阴极.
主要成果:
- 氧气调节的SEI是薄的,均的,动力稳定的,促进同质的Na+运输.
- 对称细胞表现出超稳定的涂/剥离,在3 mAh cm-2的6600个小时以上.
- 准固态电池实现了超过500个循环,在0.5°C时保持95.4%的容量.
结论:
- 氧调节的SEI策略有效地稳定了固态电池中的阳极-SE接口.
- 这种方法显著提高了循环稳定性和能量密度潜力.
- 拟议的方法为开发高性能固态金属电池提供了一个有前途的途径.
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