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SMSE Research Team Made New Breakthroughs in Solid-state Lithium Batteries

December 09, 2019      Author: Zheng Hongpeng, Duan Huanan

Recently, a group led by  Duan Huanan of Liu Hezhou's research team, School of Materials Science and Engineering/State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, has published on Advanced Functional Materials an article entitled "Intrinsic lithiophilicity of Li-garnet-electrolytes enabling high-rate lithium cycling". Its first author is Zheng Hongpeng, a master student of the School of Materials Science and Engineering, and its corresponding author is Associate Professor Duan Huanan.

Since 2013, Duan's group has been committed to studying the synthesis, performance, and application of lithium-ion solid electrolytes, and has published a series of academic papers inJournal of Power Sources, ACS Applied Materials & Interfaces, Electrochimica ActaSolid State Ionics and Angewandte Chemie (International Edition).

This work was supported by the National Natural Science Foundation of China (11304198 and 51972211), National Key Research and Development Program (2017YFB0701900), Shanghai Jiao Tong University Materials Genetic Engineering Joint Research Center Project (15X190030002), and Shanghai Jiao Tong University SMC-Morning Star Excellent Young Teacher (Class B Program) (15X100080047), etc.



Solid-state lithium batteries are widely considered as  next-generation lithium- ion battery technology due to the potential advantages in safety and perfor- mance. Among the various solid electrolyte materials, Li-garnet electrolytes are promising due to their high ionic conductivity and good chemical and electrochemical stabilities. However, the high electrode/electrolyte interfacial impedance is one of the major challenges. Moreover, short circuiting caused by lithium dendrite formation is reported when using Li-garnet electrolytes. Here, it is demonstrated that Li-garnet electrolytes wet well with lithium metal by removing the intrinsic impurity layer on the surface of the lithium metal. The Li/garnet interfacial impedance is determined to be 6.95 Ω cm2 at room temperature. Lithium symmetric cells based on the Li-garnet electro- lytes are cycled at room temperature for 950 h and current density as high as 13.3 mA cm-2 without showing signs of short circuiting. Experimental and computational results reveal that it is the surface oxide layer on the lithium metal together with the garnet surface that majorly determines the Li/garnet interfacial property. These findings suggest that removing the superficial impurity layer on the lithium metal can enhance the wettability, which may impact the manufacturing process of future high energy density garnet-based solid-state lithium batteries.

Paper Link:https://onlinelibrary.wiley.com/doi/pdf/10.1002/adfm.201906189


Translated by Chen Qianqian Reviewed by Wang Bingyu