Development of aluminosilicate polyelectrolytes for solid-state battery applications
We have synthesized and characterized a range of novel polyelectrolytes containing weakly basic aluminosilicate anions in the polymer backbone in order to achieve t+ = 1 and high ionic mobility. Room-temperature conductivity is observed to increase in the series: (NaAl(OEOMe)2)(((OE)xO)2/2)n < (NaAl(OR)2(OSiMe2(CH2) 3(OE)xO(CH2)SiMe2O)2/2)n < (NaAl(OSiR3) (OSiMe2(CH2)3(OE) xO(CH2)3SiMe2O)3/2)n. This trend is ascribed to reduced ion pairing due to decreasing anion basicity, and lowered Tg resulting from increasing siloxy character. The addition of cryptand (2.2.2) increases conductivities by 1 - 1.5 orders of magnitude. A maximum room-temperature conductivity is observed at a ratio of approx. equal 10 etheric oxygens/cation. Related lithium polymer electrolytes were evaluated in mechanically joined solid state Li(PE)(LixMn2O4-C-PE) cells.
- Research Organization:
- Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry
- OSTI ID:
- 371153
- Report Number(s):
- AD-A--308458/9/XAB; CNN: Contract DAAH04-94-G-0066
- Country of Publication:
- United States
- Language:
- English
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