ZPower to Present at the 232nd Electrochemical Society Meeting (ECS)
October 1st – 5th, 2017 | National Harbor, MD
Electrochemical Society Meeting
Electrochemical Society Meeting (ECS) is a forum for sharing the latest scientific and technical developments in electrochemistry and solid state science and technology. Scientists, engineers and industry leaders come from around the world to attend the technical symposia, poster sessions, professional development workshops, networking opportunities and social events offered at our meetings. ZPower will present on the charging method used for Silver-Zinc Rechargeable Button Cell Batteries.
Increasing Electrode Utilization and Developing a Robust Charging Method for Silver-Zinc Rechargeable Button Cell Batteries
Recently, silver-zinc (AgZn) rechargeable batteries have become commercially available in small sizes which have greater capacity and energy densities over comparatively sized rechargeable Li-ion and Li-polymer batteries. Silver-zinc batteries typically do not utilize 100% of their stored capacity; therefore, an accurate charging procedure needs to be employed to prevent overcharging and undercharging events. Charging the cell properly will increase the performance and cycle life. However, charging a cell without a battery management system is a considerable challenge since it is normally required to determine the state of charge of the battery accurately. This work provides a new robust charge algorithm which utilizes a two-zone charging approach. Silver-zinc rechargeable batteries have two voltage plateaus during discharge (Figure 1). Zone 1 is utilized when the cell is discharging in the lower plateau prior to charge (OCV~1.59V). Zone 2 is utilized when the cell was discharging in the upper plateau or transition zone prior to charge (OCV~1.82V). The cell is charged using a CC-CV (constant current-constant voltage) algorithm with a maximum charge current and a maximum charge voltage. Also, the use of additives in different electrolytes was explored and characterized with respect to increasing electrode utilization, charge rate capability, and cycle life improvement in silver-zinc rechargeable button cell batteries.Figure 1: Discharge voltage profile for Silver-Zinc button cell batteries.
Figure 1: Discharge voltage profile for Silver-Zinc button cell batteries