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人工固体电解质相间保护的LixSi纳米颗粒:为离子电池提供高效和稳定的预化反应剂

Jie Zhao¹, Zhenda Lu¹, Haotian Wang²

¹†Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States.

Journal of the American Chemical Society

|June 20, 2015

概括

表面修改的-纳米颗粒为离子电池的先化提供了增强的稳定性. 这项创新解决了损失问题,并提高了下一代高能量密度电池的性能.

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:

预化对于补偿离子电池中的损耗至关重要,特别是在固体电解质介相 (SEI) 形成期间.
- (LixSi) 纳米粒子是有效的预化试剂,但需要提高电池加工的化学稳定性.

研究的目的:

开发一种表面修饰方法,以提高LixSi纳米颗粒的稳定性.
在LixSi纳米颗粒上创建保护层,以提高环境稳定性.

主要方法:

通过热合金合成LixSi纳米粒子.
应用了使用1-fluorodecane减少的表面修饰,以形成保护性涂层.
具有涂层组成 (LiF,基碳酸与疏水链) 和稳定性的特点.

主要成果:

表面涂层有效地使LixSi纳米颗粒对环境条件无作用.
保护的LixSiNP显示了2100 mA hg-1的高预化能力,在5天的干燥空气中衰变最小.
即使在潮湿的空气 (∼10% RH) 中,也保持了显著的容量 (1600 mA h g-1).
成功预化,锡和石墨阳极,消除了不可逆转的第一循环容量损失.

结论:

表面修饰的LixSi纳米颗粒提供了一个稳定且高容量的先化溶液.
这种方法有效地减轻了离子电池不可逆转的容量损失.
能够开发下一代高能量密度的离子电池.

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