期刊
ENERGY STORAGE MATERIALS
卷 30, 期 -, 页码 67-73出版社
ELSEVIER
DOI: 10.1016/j.ensm.2020.04.042
关键词
Solid-state lithium-ion batteries; Argyrodite fast ion conductor; Li-6 -> Li-7 tracer-exchange; Ion transport pathway; Anion disorder
资金
- National Science Foundation [DMR-1808517, NSF/DMR-1644779]
- State of Florida
Solid electrolytes with high ionic conductivity and good stability are advantageous over the current liquid electrolytes in rechargeable Li-ion batteries. Argyrodites, Li6PS5X (X = Cl, Br, or I), with ionic conductivities on the order of mS/cm have attracted tremendous attention. However, the high potential of argyrodites in fast ion conduction is far from being reached. Significant enhancement in ion conduction relies on the fundamental understanding of the contributing factors for fast ion transport. Here, we have systematically prepared highly conductive Li-deficient Li6-xPS5-xCl1+x and examined the influence of Li-deficiency and Cl substitution of S on ion transport using impedance spectroscopy, solid-state NMR, and first-principles calculations. With increased Cl content, the amount of Cl- at S2- (4d) sites increases, forming a dominant 1S3Cl (4d) configuration. In addition, Li+ redistributes with significantly higher mobility. As a result, the activation energy for Li-ion transport decreases, and the conductivity increases to 17 mS/cm at 25 degrees C when x equals 0.7 (Li5.3PS4.3Cl1.7). This work not only reports a record ionic conductivity of Cl-containing argyrodites-type fast Li-ion conductors, but also provides new insights into anion disorder-induced ion transport, which has a wide and universal appeal in the development of fast ion conductors and mixed-anion functional materials.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据