Discharge performance of composite insertion electrodes Analysis of discharges of 50 vol.% Li3N/TiS2 electrodes

✍ Scribed by B.C. Knutz; K. West; B. Zachau-Christiansen; S. Atlung

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 375 KB
• Volume: 44
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/0378-7753(93)80225-e

✦ Synopsis

The dynamic properties of composite insertion electrodes, i.e., mixed-phase electrodes with solid electrolyte and insertion electrode material, have been studied by modelling and experimental investigations. The developed models describe the coupled transport of chemical diffusion in the insertion phase, ionic migration in the electrolyte phase and charge transfer between the two phases. Experimental investigations were performed on a 50 v/o Li3N/ TiS2 composite electrode. Constant current discharge curves were analysed by comparing with calculations based on the models. In agreement with theory, the discharge curves vary with the square root of time in the beginning of discharge and thereafter directly proportional to time. However, the linear regions were too short. This seems to be caused by a slow transport of lithium in LixTiS2 at high lithium concentrations.