Affiliation:
1. Department of Physics Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices Key Laboratory of Low Dimensional Condensed Matter Physics (Department of Education of Fujian Province) Jiujiang Research Institute Xiamen University Xiamen 361005 P. R. China
2. State Key Lab of Physical Chemistry of Solid Surfaces College of Materials Xiamen University Xiamen 361005 P. R. China
3. College of Materials Science and Engineering Nanjing Forestry University Nanjing 210037 P. R. China
Abstract
AbstractThe (electro)chemical reactions between Li1.3Al0.3Ti1.7(PO4)3 (LATP) solid‐state electrolyte and lithium metal plague the practical applications of LATP. A commonly used strategy to tackle this issue is to construct an ionic conductor layer to stabilize Li/LATP interface. Herein, it is demonstrated that an electronic conductor interlayer (Al or Ag) can also greatly enhance the interfacial stability of Li/LATP. To unveil the origin of the enhanced interfacial stability, a series of techniques, including in situ electron and optical microscopies, kelvin probe force microscopy, and finite element analysis, is exploited. Control experiments show clearly that Al layer can effectively homogenize the electric field distribution, which enables the uniform growth of interphases and thus prevents stress concentration and crack propagation. Moreover, when coupled with solid polymer electrolyte (SPE) to form Al‐SPE bilayer, it can effectively protect LATP from electron attack and interphase formation. Remarkably, Li symmetrical cells with an Al‐SPE bilayer exhibit superior stability of more than 5000 h at 0.2 mA cm−2, among the best cycling performances to date. This work presents an in‐depth understanding of the mechanism of the enhanced interfacial stability enabled by electronic conductor interlayers, as well as a universal interface architecture to boost the cyclability of solid‐state batteries.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Jiangxi Province
Natural Science Foundation of Jiangsu Province
Fundamental Research Funds for the Central Universities
Subject
General Materials Science,Renewable Energy, Sustainability and the Environment
Cited by
19 articles.
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