What is a lithium ion battery?

Lithium-ion batteries have gradually become mainstream in electric vehicle power batteries due to their excellent energy density, rate performance, and cycle life. At present, the most widely used cathode materials for power batteries are lithium iron phosphate (LFP) and Li x Ni y Mn z Co 1−y−z O 2 cathodes (NCM).

Are lithium iron phosphate batteries safe?

Lithium iron phosphate batteries, renowned for their safety, low cost, and long lifespan, are widely used in large energy storage stations. However, recent studies indicate that their thermal runaway gases can cause severe accidents. Current research hasn't fully elucidated the thermal-gas coupling mechanism during thermal runaway.

Can lithium iron phosphate batteries reduce flammability during thermal runaway?

This study offers guidance for the intrinsic safety design of lithium iron phosphate batteries, and isolating the reactions between the anode and HF, as well as between LiPF 6 and H 2 O, can effectively reduce the flammability of gases generated during thermal runaway, representing a promising direction. 1. Introduction

Why do LFP batteries have a lower T3 value?

This is a significant factor contributing to the lower T3 value observed during the TR of LFP batteries. Additionally, the exothermic reaction between the cathode and coated graphite has minimal impact on the rate of temperature rise.

What are the cathode materials of lithium ion batteries?

The cathode materials of LIBs include LFP, NCM, lithium cobaltate (LCO), and lithium manganate (LMO) etc. As shown in Table 1, LFP shows extremely high cycle life and a stable voltage platform, which can effectively reduce battery weight and ensure the acceleration ability of electric vehicles.

What causes lattice strain in lithium ion?

The lattice strain occurs in the cathode particles during the lithium intercalation cycle and the shrinkage and expansion cycle lead to the intragranular damage of the primary particles. Compared with secondary particles, primary particles are less prone to damage due to their micron size.