通过脱溶涂技术对稳定的Li金属阳极进行界面溶解结构调节
Guo-Xing Li1, Peter Lennartz2, Volodymyr Koverga3,4
1Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA 16802.
概括
研究人员开发了金属阳极的脱溶涂层,提高了固体电解质间相 (SEI) 稳定性. 这种技术提高了传统碳酸盐电解质中的电池循环寿命和性能.
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
- 电池技术 电池技术
背景情况:
- 可充电的金属电池需要稳定的固体电解质间相 (SEI) 进行可靠的循环.
- SEI形成受离子溶解和解溶在阳极接口的影响.
研究的目的:
- 引入一个界面溶解涂层技术来调节离子溶解结构.
- 调节电解质溶剂在SEI形成中的参与,以提高金属阳极稳定性.
主要方法:
- 使用了12-皇冠-4以太改性材料的脱溶涂层.
- 研究了使用XPS,NMR (定量和操作),冷TEM,EELS和EDS的离子溶解和SEI组成.
- 经过测试,使用常规碳酸盐电解质的LiCodeLiCoO2袋式电池.
主要成果:
- 优化涂层选择性丰富的弱协调化溶剂在金属接口.
- 通过先进的表征证实了减少有机物种的LiF占主导地位的SEI.
- 显示出出色的速率循环稳定性 (1C) 和延长的循环寿命 (在333个循环后保持80%).
结论:
- 接口溶解涂层技术有效地稳定了金属阳极上的SEI.
- 这种方法提高了金属电池在碳酸盐电解质中的性能.
- 这些发现为开发下一代高能量密度电池提供了一个有希望的战略.
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