On the complex ageing characteristics of high-power LiFePO4/graphite battery cells cycled with high charge and discharge currents
By Jens Groot and Maciej Swierczynski and Ana Irina Stan and S
Published in Journal of Power Sources
NULL
2015
Abstract
Li-ion batteries are known to undergo complex ageing processes, where the operating conditions have a profound and non-linear effect on both calendar life and cycle life. This is especially a challenge for the automotive industry, where the requirements on product lifetime and reliability are demanding. The aim of the present work is to quantify the ageing in terms of capacity fade and impedance growth as a function of operating conditions typical to high-power automotive applications; high charge and discharge rate, elevated temperatures and wide state-of-charge windows. The cycle life of 34 power-optimised LiFePO4/graphite cells was quantified by testing with charge and discharge rates between 1 and 4C-rate, temperatures between
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