Servizio Comunitario di Informazione in materia di Ricerca e Sviluppo - CORDIS

Lithium polymer batteries for electric vehicles

The project assessed a wide range of electrode materials suitable for lithium ion cells using a polymer electrolyte, that could be used as a battery for providing power for an electric vehicle. The results showed that, despite early promising results, this lithium ion concept incorporating a polymer electrolyte system could not provide the long life and high energy density required by such a battery power source.

Replacing the metal anode with a lithium -carbon intercalation anode (the SWING system) produced a reversible capacity of only 100 mAh/g at high operation temperatures. This specific energy is lower than the liquid electrolyte system where 300 mAh/g was achieved at the negative electrode. The increasing impedance of high temperature cells led to relatively low rate capability of these cells compared with the liquid electrolyte system. During the experiments, a good cycle performance (1000 cycles) from lithium -ion polymer batteries using plasticised polymer electrolytes was achieved. However, this cycle life reduced to only 200 cycles if the criterion for end-of-life was set at 80% of initial capacity, which is the usual .

Reported by

Varta Batterie AG
Gundelhardstrasse 72
65779 Kelkheim
Germany
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