EurekAlert March 3, 2021
Researchers in Russia have developed a new approach to overcharge protection of Li-ion cells, which is provided by use of electrically conductive polymer that change electrical conductivity from conductive to insulating stage. A layer of the polymer deposited between the LiFePO4 -based cathode material and current collector acts as a chemical circuit breaker increasing the electrode resistance more than 20 times when the cell voltage exceeds 4.2 V. At 5 V overcharge it allows reversible charge-discharge of the cell without developing adverse process, while at 6 V overcharge it terminates the cell operation before electrolyte decomposition starts, reducing the amount of evolved gases 4 times compared to non-protected cells…read more. TECHNICAL ARTICLE
Graphical abstract. Credit: Journal of Power Sources. Volume 490, 1 April 2021, 229548