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Graphitic Carbon Nitride (g-C3N4): An Interface Enabler for Solid-State Lithium Metal Batteries |
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| Authors: | Dr Ying Huang Prof Bo Chen Jian Duan Fei Yang Tengrui Wang Zhengfeng Wang Dr Wenjuan Yang Dr Chenchen Hu Prof Wei Luo Prof Yunhui Huang |
| Institution: | 1. Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai, 201804 P. R. China
These authors contributed equally to this work.;2. Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai, 201804 P. R. China Key Laboratory of Performance Evolution and Control for Engineering Structures of the Ministry of Education, Tongji University, Shanghai, 200092 P. R. China These authors contributed equally to this work.;3. Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai, 201804 P. R. China |
| Abstract: | Solid-state Li metal batteries (SSLMBs) have attracted considerable interests due to their promising energy density as well as high safety. However, the realization of a well-matched Li metal/solid-state electrolyte (SSE) interface remains challenging. Herein, we report g-C3N4 as a new interface enabler. We discover that introducing g-C3N4 into Li metal can not only convert the Li metal/garnet-type SSE interface from point contact to intimate contact but also greatly enhance the capability to suppress the dendritic Li formation because of the greatly enhanced viscosity, decreased surface tension of molten Li, and the in situ formation of Li3N at the interface. Thus, the resulting Li-C3N4|SSE|Li-C3N4 symmetric cell gives a significantly low interfacial resistance of 11 Ω cm2 and a high critical current density (CCD) of 1500 μA cm?2. In contrast, the same symmetric cell configuration with pristine Li metal electrodes has a much larger interfacial resistance (428 Ω cm2) and a much lower CCD (50 μA cm?2). |
| Keywords: | Graphitisches Kohlenstoffnitrid Grenzflächenkompatibilität Li-Dendriten Festkörperelektrolyte Lithium-Metall-Festkörperbatterien |