Application of solid-polymer electrolyte in lithium batteries: ultra-thin film battery

Noda, Takuto; Kato, Shigeru; Yoshihisa, Y.; Takeuchi, Ken′ichi; Murata, K.

doi:10.1016/0378-7753(93)80105-x

Cited by 12 publications

(1 citation statement)

References 2 publications

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“…In recent years, solid polymer electrolytes (SPE) have been extensively studied due to their potential applications, [1][2][3][4][5][6][7] particularly for the development of high-energy density batteries. [8][9][10] Among those, poly(ethylene oxide) (PEO)-based electrolytes are the most extensively studied.…”

Section: Introductionmentioning

confidence: 99%

Ionic conductivities of the LiCF3SO3 complexes with liquid crystalline aromatic polyesters having oligo(oxyethylene) pendants

2004

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We have synthesized new aromatic polyesters (DiPEG-HQ and DiPEG-BP) by condensation polymerization of a terephthalic acid derivative bearing a pendant oligo(oxyethylene) ( = 7, = 350), which has a methoxy terminal group, and two different aromatic diols, hydroquinone and 4,4´-biphenol. The synthesized polymers were characterized by differential scanning calorimetry (DSC), polarizing microscopy, and X-ray diffractometry for their liquid crystallinity (LC), thermal transitions, and structural morphologies in mesophases. The morphology of the LC phases depends strongly on the length of the rigid backbone repeating unit. The DiPEG-BP polymer having a longer repeating unit exhibits both layered and nematic structures before isotropization, whereas the DiPEG-HQ polymer having a shorter repeating unit shows only the layered structure in the mesophase. We found that the layer spacing for DiPEG-HQ is larger than that for DiPEG-BP. Both polymers easily form complexes with LiCF 3 SO 3 ; we studied this complex formation by FT-IR spectroscopy. The layer spacing of the polymer-electrolyte composites increases upon increasing the amount of the lithium salt. The polymer/salt electrolyte mixtures we investigated at molar ratios of EO:salt in the range of 5-20 exhibit electrical conductivity values at 40 o C of 2.4Ý 10 -5 and 1.1Ý 10 -5 S/cm for DiPEG-HQ/LiCF 3 SO 3 and DiPEG-BP/LiCF 3 SO 3 , respectively. At 80 o C, these values are higher: 4.6 Ý 10 -4 and 2.5Ý 10 -4 S/cm, respectively. The activation energy of conductivity depends strongly on the salt concentration.

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