高的分层氧化物阴极使固态离子电池的高速率成为可能
Tianxun Cai1,2, Mingzhi Cai3, Jinxiao Mu1,2
1State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, People's Republic of China.
Nano-micro letters
|November 9, 2023
概括
高设计和兴奋剂增强了离子电池的O3型分层氧化物,提高了空气稳定性和高速率性能. 这一策略提高了固态离子电池的潜力.
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:
- 由于能量密度高和成本低,O3型层氧化物是离子电池的有希望的阴极.
- 挑战包括相位过渡,缓慢的动力学和空气不稳定性,阻碍了固态电池的性能.
研究的目的:
- 为固态离子电池开发高性能阴极材料.
- 为了提高O3型层氧化物的速率能力,空气稳定性和电化学热稳定性.
主要方法:
- 在Na0.95Li0.06Ni0.25Cu0.05Fe0.15Mn0.49O2上采用高设计和 (Li) 兴奋剂策略.
- 研究材料的电化学性能,包括容量,速率能力和循环稳定性.
- 评估空气稳定性和热稳定性.
主要成果:
- 修改后的阴极在0.2°C时具有高可逆容量141mAhg-1和出色的速率能力 (8°C时111mAhg-1,20°C时85mAhg-1).
- 实现了长期稳定性,在1000个循环后保持超过85%的容量,归因于抑制的相位过渡.
- 证明了7天的空气稳定性和高达279°C的热稳定性.
- 使用这种阴极的聚合物固态电池在5°C下提供了92mAh-1g,在400个循环后保持96%的电容.
结论:
- 高设计和兴奋剂有效地提高了O3型分层氧化物阴极的性能.
- 这一策略显著提高了离子电池的空气稳定性,速率能力和电化学热稳定性.
- 开发的材料显示出高性能固态离子电池的巨大潜力.
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