Pore-controlled polymer membrane with Mn (II) ion trapping effect for high-rate performance LiMn2O4 cathode
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Since Li+ ions can transport through porous channels in the separator containing liquid electrolyte, the electrochemical and structural properties of the separator needs to be improved to develop a high rate performance lithium-ion battery (LIB). In this study, a gel-type polymer membrane using poly (vinylidene fluoride-co-hexafluoropropylene) (P (VDF-HFP)) acting as a matrix and ethylene carbonate (EC) as a separator was applied for a high-performance LIB with LiMn2O4 as a cathode. The cell assembled with the porous polymer gel electrolyte membrane prepared using P (VDF-HFP) with an appropriate amount of EC exhibited an improved capacity (78.8 mAh g−1) and energy density (308.4 mWh g−1) at a current density of 720 mA g−1, and a high capacity retention (94.8%) at a current density of 240 mA g−1, compared to the cell assembled with polyethylene as a separator. The enhanced LIB performance can result from an increased Li+-ion migration between the chains in low-crystalline polymer membranes and an increased volume of the liquid electrolyte for ionic motion in the porous membrane due to an increased porosity.
KeywordsP (VDF-HFP) Ethylene carbonate Porous polymer gel electrolyte membrane High rate performance Li-ion batteries
This research was supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2017M1A2A2086648).
- 10.Gupta H, Kataria S, Balo L, Singh VK, Singh SK, Tripathi AK, Verma YL, Singh RK (2018) Electrochemical study of ionic liquid based polymer electrolyte with graphene oxide coated LiFePO4 cathode for li battery. Solid State Ionics 320:168–192Google Scholar
- 27.Zhang J, Sun B, Huang X, Chen S, Wang G (2014) Honeycomb-like porous gel polymer electrolyte membrane for lithium ion batteries with enhanced safety. Sci Rep 4:1–7Google Scholar
- 40.Kim I, Kim BS, Nam S, Lee HJ, Chung HK, Cho SM, Luu THT, Hyun S, Kang C (2018) Cross-linked poly (vinylidene fluoride-co-hexafluoropropene) (PVDF-co-HFP) gel polymer electrolyte for flexible li-ion battery integrated with organic light emitting diode (OLED). Materials 11(4):543CrossRefGoogle Scholar