界面化学使全固态金属电池在高电流密度下能够稳定循环
Biyi Xu1, Xinyu Li1, Chao Yang2
1Materials Science and Engineering Program and Texas Materials Institute, University of Texas at Austin, Austin, Texas 78712, United States.
Journal of the American Chemical Society
|April 27, 2021
概括
盐添加剂增强了固体聚合物电解质,使金属电池更安全,更高性能. 它增强了离子导电性,并阻止了树突的生长,使电池充电速度更快,寿命更长.
科学领域:
- 材料科学
- 电化学
- 固态化学
背景情况:
- 全固态金属电池提供了更高的安全性,但面临着低离子导电性和聚合物电解质中状物形成的挑战.
- 低Li+离子流动性和不稳定的接口限制了基于聚乙烯氧化物的电解质的性能.
- 开发强大的固体电解质对于下一代高能量密度电池至关重要.
研究的目的:
- 调查甲 (Mg) 作为聚乙烯氧化物 (PEO) 复合电解质中的添加剂的有效性.
- 改善室温离子导电性和固态金属电池的临界电流密度.
- 了解控制+离子传输和树突抑制的界面机制.
主要方法:
- 基于PEO的复合电解质与Mg ((ClO4) 2添加剂的实验性表征.
- 计算研究以阐明离子传输机制和界面相互作用.
- 完全固态金属电池 (Li/Li,LiFePO4/Li,LiNi0.8Mn0.1Co0.1O2/Li) 的组装和测试
主要成果:
- 2+离子在PEO矩阵中固定,增强+离子的移动性.
- 一个在现场形成的Li2MgCl4/LiF界面层在涂层过程中促进了均的Li+流量.
- 关键电流密度增加到创纪录的2 mA cm-2,显示出更好的界面稳定性.
结论:
- ((ClO4) 2) 是一种有效的增强基于PEO的固体聚合物电解质的添加剂.
- 通过添加剂进行界面工程是实现高性能固态金属电池的关键.
- 开发的电解质可以为高电流密度应用提供竞争力的电池性能.
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