Solid polymer electrolytes by blending high molecular weight commercial polymers and alkali metal salts. Preparation and characterization of poly(ethyleneoxide)/poly(2-vinylpyridine) or poly(4-vinylpyridine)/LiClO{sub 4} blends
- Clark Atlanta Univ., GA (United States)
Solid polymer electrolytes have been prepared by blending high molecular weight poly(ethyleneoxide) with poly(2-vinylpyridine) or poly(4-vinylpyridine) and LiClO{sub 4}. Poly(ethyleneoxide) (M.W. 6000,000; 75% by wt.)/poly(2-vinylpyridine) (M.W. 200,000; 25% by wt.)/LiClO{sub 4} blends shown a continuous increase in ionic conductivity with increasing LiClO{sub 4} content. This behavior is in contrast to that generally observed for solid polymer electrolytes. The increasing conductivity of PEO(75)/P2VP(25)/LiClO{sub 4} blends with increasing LiClO{sub 4} content is possibly because poly(2-vinylpyridine) effectively disperses the salt throughout the blend. This theory is consistent with the DSC data exhibited by these blends. The Tg value is independent of salt concentration and is {minus}35{degrees}C or lower. Blends of PEO(75)/P4VP(25)/LiClO{sub 4} shows behavior similar to that of the PEO(75)/P2VP(25)/LiClO{sub 4} system. However, the blend with 15% P4VP content [PEO(85)/P4VP(15)/LiClO{sub 4}] reaches a maximum of 7.6 {times} 10{sup {minus}6} S cm{sup {minus}1} (30{degrees}C) at an EO/Li ratio of 6 and decreases as the salt content is further increased. This conductivity value is 70-80 times higher than the PEO/Li system at the same salt content. These blends are elastomeric materials while the corresponding PEO/Li is a tacky viscous fluid. Therefore, blending is a promising technique to prepare solid polymer electrolytes.
- OSTI ID:
- 141540
- Report Number(s):
- CONF-930304--
- Country of Publication:
- United States
- Language:
- English
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