Stock-E - Stockage innovant de l’énergie

Carbon honeycomb current collectors for light-weight lead-acid batteries – CARBOLEAD 2010

Submission summary

The aim of the project is the increase of the energy density of the lead-acid battery replacing the conventional lead alloy current collectors with conductive carbon honeycomb composite ones. In the beginning of the project the conductive carbon composite material will be developed, optimizing its cost in terms of time and energy consumption. Further the developed material will be electroplated with lead-tin alloy layer with proper thickness, optimal corrosion and mechanic resistance. After the optimization of the electroplating processes, all the obtained experience will be focused on the development of the prototype AGM valve-regulated lead-acid batteries (VRLAB) with honeycomb grids. The aimed energy density of 80Wh/kg and 150Wh/l will be achieved by both increase of the active material utilisation up to 70-80% due to the honeycomb grid structure and due to the low density of the carbon current collectors. One part of the prototypes will be tested under the electric vehicle and hybrid electric vehicle protocols, and another will be used for demonstration in commercially available electric scooter, replacing its original lead-acid batteries. A special study will be carried out on the structure of the interface between the carbon and the lead coating and its evolution during the battery ageing. The corrosion processes will be optimised. The management of the prototypes will be improved using integrated “low cost / long life) reference electrodes (Ag/Ag2SO4/H2SO4). The reference electrodes will be manufactured industrially using a new technology patented by CEA in 2007. They will work as electrochemical sensors inside the battery cells, allowing improving the duration and the security of the charge process keeping lower positive grid corrosion rates, and estimating State of Charge by innovative approaches. The preliminary economic analysis of the new technology showed that it is capable to deliver a battery at same or lower cost per kWh as the actual AGM-VRLAB or tubular batteries.

Project coordination

KIRCHEV Angel (COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES - CENTRE DE GRENOBLE) – angel.kirchev@cea.fr

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

M² MATERIALS MATES
STECO STECO POWER
IJL UNIVERSITE DE NANCY I [HENRY POINCARE]
CEA-LITEN COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES - CENTRE DE GRENOBLE

Help of the ANR 396,480 euros
Beginning and duration of the scientific project: - 36 Months

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