期刊
ENERGY STORAGE MATERIALS
卷 22, 期 -, 页码 337-345出版社
ELSEVIER
DOI: 10.1016/j.ensm.2019.02.004
关键词
Solid polymer electrolyte; In situ polymerization; High-voltage cathode; UV-curing
资金
- National Key Research and Development Program of China [2016YFB0100105]
- National Natural Science Foundation of China [51502317]
- Youth Innovation Promotion Association of the Chinese Academy of Science [2017342]
- Zhejiang Provincial Natural Science Foundation of China [LQ16E020003, LY18E020018, LY18E030011, LD18E020004]
- Natural Science Foundation of Ningbo [2018A61002]
- National Key R&D Program of China [2018 YFB0104300]
- State Key Program of National Natural Science of China [51732005]
- Natural Science Foundation of Guangdong Province, China [2016A030311031]
A novel solid state polymer electrolyte with high ionic conductivity was fabricated by solvent-free photopolymerization method and applied in solid state lithium battery with high-voltage cathode. The polymer structure was confirmed by FT-IR, and polymer electrolyte exhibits high ionic conductivity of 2.35x10-(-4) S cm(-1) at ambient temperature, wide electrochemical window of 0-4.63 V (vs. Li+/Li), excellent compatibility with lithium metal electrode for over 2000 h without short-circuit occurrence. Besides, LiMn0.8Fe0.2PO4//Li batteries were assembled to evaluate battery performance, delivering maximum discharge capacity of 168.7 mAh g(-1) at 0.1 C and 154.7 mAh g(-1) at 0.5 C with capacity retention of 89.72% after 450th cycle at 60 degrees C. Also, the battery operated well at ambient temperature with capacity of 124.6 mAh g(-1) and the capacity retention was 92.1% after 200 cycles. Importantly, the new polymer electrolyte is qualified to be applied in high-voltage cathode of LiNi0.85Co0.05Al0.1O2, delivering 108.8 mAh g(-1) after 100th cycle at 0.5 C at 40 degrees C. The integrated cathode with electrolyte reducing interfacial resistance contributes excellent battery performance. The results demonstrate that this solid polymer electrolyte (SPE) is a promising candidate electrolyte for high energy density solid-state lithium metal battery.
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