Studies of the Fundamentals of Solids State Batteries
Abstract
Several methods have been developed to dimensionally stabilize polymer electrolytes based on poly-(bis(methoxyethoxyethoxide)phosphazene, known as MEEP. In contrast to the poor dimensional stability exhibited by complexes of MEEP with most Li salts, those prepared with LiAICI4 have been isolated as the first example of free-standing MEEP-(LiX)n films. The mechanical properties of dimensionally unstable MEEP-(LIX)n complexes can be significantly improved by forming composites with polymers such as poly(ethylene oxide), poly(propylene oxide), poly(ethylene glycol diacrylate) and poly(vinyl pyrrolidinone). The conductivity of 0.000067 per ohm per cm at 25C exhibited by 55 w/o MEEP/45 w/o PEO-LiN(CF(3)SO(2)20.13 is among the highest values reported to date for a dimensionally stable electrolyte. The preparation, and conductivity, calorimetric and electrochemical studies of these electrolytes are described. Cyclic voltammetric data indicated that these electrolytes have anodic stability at least up to 4.5V versus Li+/Li. They have shown excellent compatibility with Li metal making them suitable for use as Li+ conductive solid electrolytes in solid-state Li batteries. Li/TiS2 solid-state cells utilizing some of these electrolytes have exceeded 200 cycles. (R.H.)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 06, 1990
- Accession Number
- ADA228772
Entities
People
- K. M. Abraham
- M. Alamgir