A fibrotic poly (ethylene oxide) polymer electrolyte with high ionic conductivity for stable lithium metal batteries
Lithium metal battery (LMB) is considered to be the most promising next generation secondary battery. However, the low ionic conductivity and high interfacial impedance between solid electrolyte and electrode are the main factors to limit the real application of solid electrolyte in LMBs. In this work, we designed a low resistance LMB with excellent electrochemical performance applying the electrospun poly (ethylene oxide) (PEO) with super low crystallinity as the electrolyte and LiPF6 in EC/EMC/DMC as the plasticizer. The electrospun PEO shows an ionic conductivity of 1.27 mS cm− 1 at 30 °C, which result from its amorphous region and fibrotic structure to accommodate large amount of liquid electrolyte without leakage. The electrochemical window can be 5.0 V (vs. Li/Li+). The obtained electrospun PEO presented robust electrochemical surface stability and could effectively restrain the dendrite growth. The Li symmetric cells using electrospun PEO can stably cycle for 800 h without short circuit at 0.1 mA cm− 2. The study proposed a robust and scalable battery structure with outstanding electrochemical properties.
The authors acknowledge the fund from the National Natural Science Foundation of China (No. 51572147), National Natural Science Foundation for Excellent Young Scholars (No. 51722703) and Beijing Natural Science Foundation (No. 3162017).
Conflict of interest
The authors declare that they have no conflict of interest.
- 12.P. Yan, Z. Huang, Y. Lin, X. Wu, Y. Yang, D. Wang, F. Chen, C. Zhang, D. He, Ionics 21 593 (2015)Google Scholar
- 21.M. Jacob, Solid State Ionics 104 267–276 (1997)Google Scholar
- 25.W. Liu, Z. Wu, D.H. Reneker, Polym. Prepr. 41, 1193 (2000)Google Scholar