Lithium iron phosphate (LFP) technology has a longer history and is more mature. Its core advantages are low price, environmental friendliness, high safety performance, and good structural stability and cycle performance. Its disadvantages include poor low-temperature performance and low energy density.
Lithium manganese iron phosphate (LFP) is a product of the blending of lithium iron phosphate (LFP) and lithium manganese phosphate (LMP). It shares the same structure as LFP, exhibiting an ordered and regular olivine-type structure. LFP possesses the same advantages as LFP: low cost, high safety performance, high thermal stability, no spontaneous combustion upon needle penetration or overcharging, long lifespan, and no risk of explosion. It can be considered a combination of the advantages of both LFP and LMP, while also compensating for the low energy density of LFP, thus earning the reputation of being an "upgraded version of LFP."
Comparison of parameters between lithium iron phosphate and lithium manganese iron phosphate
1. Higher battery energy density and longer battery life.
The theoretical capacity of lithium manganese iron phosphate is the same as that of lithium iron phosphate, which is 170 mAh/g. However, the electrode potential of lithium manganese iron phosphate relative to Li/Li is 4.1V, which is much higher than that of lithium iron phosphate (3.4V). It is located in the stable electrochemical window of the organic electrolyte system, which is 0.7V higher than that of lithium iron phosphate. The plateau voltage is increased by 20%, thus increasing the energy density of lithium manganese iron phosphate from 578Wh/kg to 697Wh/kg for the same volume mass.
2. Lower manufacturing costs.
The main difference between lithium manganese iron phosphate and lithium iron phosphate lies in the amount of manganese source required. Each kWh of lithium iron phosphate cathode requires 0.61 kg of iron source, while each kWh of lithium manganese iron phosphate cathode requires 0.13 kg of iron source + 0.38 kg of manganese source.
Defects of lithium manganese iron phosphate
Compared to lithium iron phosphate, lithium manganese iron phosphate has the following drawbacks:
1. Lithium manganese iron phosphate has a short cycle life and poor charge/discharge capability. The addition of manganese to lithium manganese iron phosphate leads to the dissolution of manganese, which results in a shorter cycle life and poorer charge/discharge capability and lifespan.
2. The low conductivity of lithium manganese iron phosphate makes it difficult to realize its capacity, and the side reaction with the electrolyte also makes it difficult to realize the capacity of the material.
Lithium manganese iron phosphate (LFP) cathode material batteries, as a practical new type of lithium battery, represent the future direction of battery development. It is the most ideal power battery invented to date. In the future, it may even become the cheapest power battery, and is one of the core products for the future development of the battery industry. It has unparalleled advantages compared to other power batteries.
