Pore-controlled polymer membrane with Mn (II) ion trapping effect for high-rate performance LiMn2O4 cathode
- Authors
- Shin, Y.-K.; Kim, M.-C.; Moon, S.-H.; Kim, E.-S.; Lee, J.-E.; Choi, S.; Kim, H.; Park, K.-W.
- Issue Date
- Feb-2019
- Publisher
- Springer New York LLC
- Keywords
- P (VDF-HFP); Ethylene carbonate; Porous polymer gel electrolyte membrane; High rate performance; Li-ion batteries
- Citation
- Journal of Solid State Electrochemistry, v.23, no.2, pp.475 - 484
- Journal Title
- Journal of Solid State Electrochemistry
- Volume
- 23
- Number
- 2
- Start Page
- 475
- End Page
- 484
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/31051
- DOI
- 10.1007/s10008-018-4153-2
- ISSN
- 1432-8488
- Abstract
- 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. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
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