Lithium iron phosphate battery voltage fluctuates greatly

Does low n/p ratio affect high energy density batteries?

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.

What is the failure mechanism of low n/p ratio battery?

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.

What causes low n/p ratio LFP/graphite pouch batteries to fail?

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).

What is the retention rate of a lithium ion battery?

The capacity retention rate was increased from 70.24% (650 cycles) to 82.3% (2300 cycles). Generally, the ratio of negative to positive electrode capacity (N/P) of a lithium-ion battery is a vital parameter for stabilizing and adjusting battery performance. Low N/P ratio plays a positive effect in design and use of high energy density batteries.

What is the N/P ratio of LFP battery?

Therefore, studying the failure modes of different N/P ratio battery is essential for battery design, especially to achieve high energy density. To ensure safety and stability, the N/P ratio of LFP is usually kept between 1.1 and 1.2 , .

What is the structure of lithium iron phosphate (LFP) battery?

Lithium Iron Phosphate (LFP) Battery 3.1. Structure and Properties of LFP LFP has an olivine crystal structure , which transforms into the FePO 4 (FP) phase during the charging process. Due to the similar crystal structure of the two phases, the volume change of the crystal cell before and after discharge is only 6.81%.