Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (11): 1263-1268.doi: 10.3866/PKU.WHXB20051114

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Preparation and Performances of a Novel Gel Polymer Electrolyte

TANG Ding-guo; LIU Jian-hong; CI Yun-xiang; QI Lu   

  1. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871; CITIC Guo’an Mengguli Power Source Technology Company, Limited, Beijing 102200
  • Received:2005-04-26 Revised:2005-06-14 Published:2005-11-15
  • Contact: QI Lu

Abstract: A novel gel polymer electrolyte (GPE) based on noepentyl glycol diacrylate (NPGDA) and poly(vinyli-dene fluofide-co-hexafluoropropylenen) (PVDF-HFP) was prepared by a thermal polymerization method. GPE with a stable interpenetrating polymer network (IPN) structure was used to assemble polymer lithium-ion batteries. The influence of PVDF-HFP/NPGDA mass ratios on the characteristics of GPE was studied by scanning electron microscopy, linear sweep voltammetry and electrochemical impedance spectroscopy. The results show that PVDF-HFP/NPGDA mass ratio greatly affects the performances of GPE, such as surface morphology and ionic conductivity. When the mass ratio between PVDF-HFP and NPGDA is 1:1, GPE boasts a high ionic conductivity of 6.99×10-3 S•cm-1 and an electrochemical stability window of 4.8 V(vs Li+/Li) at 25 ℃. The polymer lithium-ion batteries based on GPE also present excellent performances, such as high rate capability and discharge voltage plateau, good temperature reliability, and excellent cycling.

Key words: Gel polymer electrolyte, Noepentyl glycol diacrylate, Interpenetrating polymer network, Thermal polymerization, Polymer lithium-ion batteries