一种自我愈合,可流动,但固体的电解质抑制了金属的形态不稳定性.
Yubin He1, Chunyang Wang1, Ruoqian Lin2
1Department of Physics and Astronomy, University of California, Irvine, CA, 92697, USA.
Advanced materials (Deerfield Beach, Fla.)
|October 10, 2024
概括
用于金属电池的新型自愈固体电解质修复裂并适应电极体积变化. 这种先进的电解质可实现稳定的循环和延长电池寿命,克服了关键的实施挑战.
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
- 固态电池 固态电池是什么
背景情况:
- 金属固态电池面临着像状岩石形成和接口不稳定等挑战.
- 固体电解质中的空隙和裂是电池运行期间的关键故障点.
- 现有的电解质努力平衡机械完整性与离子导电性.
研究的目的:
- 为金属电池开发一种自我愈合,可流动的固体电解质.
- 为了解决循环过程中的空隙/裂形成和电极体积变化.
- 为了提高金属固态电池的循环稳定性和寿命.
主要方法:
- 使用可重新配置的聚合物网络中的移动陶晶体制造自愈电解质.
- 通过操作同步X射线,现场传输电子显微镜 (TEM) 和固态NMR进行表征.
- 在各种电流密度和循环条件下测试Li0-Li0和Li0-NMC811全电池.
主要成果:
- 电解质具有5.6μm h-1的自我愈合率,并且在液态和固态之间动态切换.
- 证明了适应电极体积变化和调节具有高抗拉强度 (0.28 MPa) 的沉积.
- 在Li0-Li0细胞中实现了延长的循环寿命 (12,000小时在0.2 mA cm−2) 和在完整细胞中稳定的循环 (1100个循环在5 mA cm−2).
结论:
- 设计的自愈电解质有效地减轻了金属固态电池的关键故障机制.
- 双相离子导电和快速Li+扩散有助于提高电化学性能.
- 这种材料为开发强大且持久的固态金属电池提供了有前途的途径.
相关概念视频
02:37Metallic Solids
18.3K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.3K
02:48Ionic Bonding and Electron Transfer
41.3K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
41.3K