What are the advantages and disadvantages of lithium manganese iron phosphate versus lithium iron phosphate?

Lithium iron phosphate is a lithium-ion battery electrode material with the chemical formula LiFePO4 (LFP for short), which is mainly used in various lithium-ion batteries. Lithium iron phosphate has an ordered and regular olivine-type structure, in which the lithium ion has one-dimensional mobility. It can be reversibly dislodged and embedded during the charging and discharging process.

Lithium iron phosphate started earlier, the technology development is more mature, and its core advantages are low price, environmentally friendly, higher safety performance, better structural stability and cycle performance. The disadvantages are poor low temperature performance and low energy density.

Lithium manganese iron phosphate belongs to lithium iron phosphate and lithium manganese phosphate mixed products, and lithium iron phosphate structure is the same, are ordered regular olivine-type structure. Lithium manganese iron phosphate and lithium iron phosphate have the same low cost, high safety performance, high thermal stability, pinprick, overcharging does not occur spontaneous combustion, long life, safety and no risk of explosion of the advantages, it can be said to be both lithium iron phosphate and lithium manganese phosphate advantages, but also to make up for the lithium iron phosphate energy density of the low short board, and therefore also known as the "upgraded version of lithium iron phosphate Therefore, it is also known as "the upgraded version of lithium iron phosphate".

Comparison of parameters between lithium iron phosphate and lithium manganese iron phosphate

1. Battery energy density is bigger and range is stronger.

Lithium manganese iron phosphate theoretical capacity and lithium iron phosphate is the same, 170mAh/g; but lithium manganese iron phosphate relative to Li/Li electrode potential of 4.1V, much higher than the lithium iron phosphate of 3.4V, and is located in the organic electrolyte system of the stabilization of electrochemical window, compared with lithium iron phosphate to enhance the 0.7V, the plateau voltage increased by 20%, which contributed to the energy density of the lithium manganese iron phosphate under the same volume and mass. The energy density of lithium manganese iron phosphate is increased from 578Wh/kg to 697Wh/kg in the same volume mass. 2.

2. Lower manufacturing cost.

The main difference between Li-Fe-MnFePO4 and Li-FePO4 material dosage is the change in the amount of manganese source required, with 0.61kg of iron source required per kWh of Li-FePO4 positive electrode and 0.13kg of iron source + 0.38kg of manganese source per kWh of Li-Fe-MnFePO4 positive electrode.

Defects of lithium manganese iron phosphate

Compared with lithium iron iron phosphate, lithium manganese iron phosphate has the following defects:

1, the cycle life of lithium manganese iron phosphate is shorter, poorer charging and discharging ability. There is manganese added in lithium manganese iron phosphate, and the dissolution of manganese will lead to shorter cycle life and poorer charging and discharging ability and life.

2、Lithium manganese iron phosphate's low conductivity makes it difficult to realize its capacity, and it will have side reaction with electrolyte, which makes it difficult to realize the capacity of the material.

As a practical new type of lithium battery, lithium manganese iron phosphate cathode material battery represents the direction of future development of battery. It is the most ideal power battery invented so far. In the future, it will even become the cheapest power battery, which is one of the core products of the future development of the battery industry. It has incomparable advantages over other power batteries.