Solid state lithium batteries: evaluation and optimisation
The aim of this project was to evaluate a number of important materials parameters associated with the all-solid-state polymer electrolyte battery system and relate these to practical applications, e.g. vehicle traction. The polymer electrolyte in a test cell was optimised in terms of ionic conductivity, cell internal resistance, cell rate performance and first discharge performance. A standard cell configuration, based on the electrolyte PEO(14):LiClO(4) and on the active cathode material V(6)O(13), was defined for operation at 120 C and used for all subsequent evaluation testing. The cell lamination technique was found to be critical for good cell performance. The effect of overdischarge and overcharge on the standard cell cycling performance is reported. The cells were found to tolerate moderate degrees of overdischarge but large amounts cause premature deterioration in the long term cycling performance. Several methods of charging the standard cell were investigated and the optimum recommended: constant to 3.50 V with a 2h potentiostatic hold at 3.50 V to provide a top-up period. From a series of safety tests, it is concluded that the polymer electrolyte test cells are very safe and are resistant to mechanical abuse, with several continuing to operate after being punctured.
Bibliographic Reference: EUR 13135 EN (1991) 54 pp., MF, ECU 4, blow-up copy ECU 7.50
Record Number: 199110193 / Last updated on: 1994-12-02
Original language: en
Available languages: en