Research on aging mechanism of NCA/Graphite lithium battery at high temperature on full cycle life
A fixed node aging experiment was conducted at 60℃on a commercial nickel-cobalt-aluminum/graphite lithium battery,and the aging mechanism throughout the lifecycle was identified using capacity increment analysis and voltage relaxation analysis methods.The aging mechanism was verified using electrode morphology observation and analysis methods.The results showed that the aging of the lithium battery occurred in two stages:the first stage was linear aging,which was relatively slow,and the main aging mechanism was the loss of available lithium ions caused by the formation of the negative electrode SEI film and the loss of negative electrode active materials;the second stage was nonlinear aging,which was relatively fast,and the main aging mechanism was the fragmentation of positive electrode particles,dissolution of transition metals,and internal gas generation in the battery,leading to an intensification of active material loss.
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