Analysis of the reliability and failure mode of lithium iron phosphate batteries is essential to ensure the cells quality and safety of use. For this purpose, the paper built a model of battery performance degradation based on charge–discharge characteristics of lithium iron phosphate batteries .
These articles explain the background of Lithium-ion battery systems, key issues concerning the types of failure, and some guidance on how to identify the cause(s) of the failures. Failure can occur for a number of external reasons including physical damage and exposure to external heat, which can lead to thermal runaway.
The failure mechanism of low N/P ratio battery is mainly due to the deposition of lithium on NE. It will lead to the continuous thickening of the SEI film and the rapid exhaustion of the electrolyte.
Low N/P ratio plays a positive effect in design and use of high energy density batteries. This work further reveals the failure mechanism of commercial lithium iron phosphate battery (LFP) with a low N/P ratio of 1.08.
For this purpose, the paper built a model of battery performance degradation based on charge–discharge characteristics of lithium iron phosphate batteries . The model was applied successfully to predict the residual service life of a hybrid electrical bus.
The failure mechanism of low N/P ratio LFP/graphite pouch batteries (≥70 Ah) has been studied. The deposition of lithium metal on the negative electrode is the main cause of capacity fade. The capacity retention rate was increased from 70.24% (650 cycles) to 82.3% (2300 cycles).