Increase ionic conductivity of a Zn2+/F? synergy Na3Zr2Si2PO12 solid electrolyte for sodium metal batteries |
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| Affiliation: | 1. Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;2. Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China;3. School of Materials, Sun Yat-sen University, Shenzhen 518107, China;1. Department of Materials Science and Engineering, Pohang University of Science and Technology, 77 Cheongamro, Namgu, Pohang, Gyeongbuk, 790-784, South Korea;2. Materials Research Division, Research Institute of Industrial Science and Technology, 76 Cheongamro, Namgu, Pohang, Gyeongbuk, 790-330, South Korea;1. College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China;2. College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin 150040, China;3. Tianfu Yongxing Laboratory, Chengdu 611130, China;4. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;5. School of Physics, University of Electronic Science and Technology of China, Chengdu 611731, China |
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| Abstract: | Na3Zr2Si2PO12 (NZSP) solid-state electrolyte is considered one of the most promising solid-state electrolyte because of their excellent electrochemical and thermal stability. Even though, the low conductivity of NZSP solid-state electrolytes hinders practical application. Therefore, an anions/cations co-assisting strategy is proposed by introducing the Zn2+ and F?. The influence of adding different amounts of Zn2+ and F? on the Na+ conductivity of NZSP was investigated computationally and experimentally. The Zn2+/F? co-assisting (Na3.3Zr1.85Zn0.15Si2PO12) solid-state electrolyte exhibits the ionic conductivity of 0.722 mS cm?1 at 30 °C, and the activation energy of ～0.237 eV. Its applicability in a solid-state battery is tested, and the assembled Na/Na3V2(PO4)3 (NVP) battery exhibits an outstanding electrochemical performance of 98.4% capacity retention after being cycled at 0.5 C. Moreover, DFT calculations also have been used to demonstrate the effect of doping on the crystal structure and space migration energy barrier. This research provides new ideas for improving the electrochemical properties of inorganic solid electrolytes. |
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| Keywords: | NASICON Sodium metal battery Solid-state electrolyte |
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