Amorphous hollow carbon film as a flexible host for liquid Na-K alloy anode |
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| Institution: | 1. Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Nanjing Tech University, Nanjing 211816, China;2. School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China;1. College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou 311300, China;2. Institute of Flexible Electronics, Northwestern Polytechnical University, Xi''an 710072, China;3. School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China |
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| Abstract: | Compared with solid alkali metal anodes (Li, Na, K), liquid metal anodes (LMAs) could enable high-energy batteries due to their unique advantages, such as self-healing property and no dendrites. Among LMAs, liquid Na-K alloy anode has become a hotspot due to its high theoretical capacity, low redox potential and formation at room temperature (RT). However, it is challenging to utilize liquid Na-K alloy directly and independently as an electrode; and the high surface tension makes it more difficult to immerse into porous current collectors at RT. Herein, an amorphous hollow carbon film (AHCF) consisting of hollow spheres with significant surface defects has been designed to quickly infiltrate Na-K liquid alloy into the hollow carbon film at RT, forming a composite electrode (Na-K@AHCF). The symmetric cell with Na-K@AHCF could exhibit a cycle lifespan up to 400 h at 0.1 mA/cm2 and achieve stable stripping/deposition even at 5 mA/cm2. When matching with cathode material of sulfurized polyacrylonitrile (SPAN), the obtained K-S full cell exhibits good cycle stability and rate performance. |
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