What are the advantages and disadvantages of lithium manganese iron phosphate compared with Lithium iron phosphate?
Release time:
Jul 14,2023
Lithium iron phosphate is an electrode material for lithium-ion batteries, with the chemical formula LiFePO4 (LFP), which is mainly used for various lithium-ion batteries. Lithium iron phosphate has an orderly olivine type structure, in which the lithium ion has one-dimensional mobility. Reversible detachment and insertion can occur during the charging and discharging process.
Lithium iron phosphate started early and its technology is relatively mature. Its core advantages are low price, environmentally friendly, high safety performance, good structural stability and cycling performance. The disadvantage lies in poor low-temperature performance and low energy density.
Lithium manganese iron phosphate is the product of mixing Lithium iron phosphate and Manganese(II) phosphate lithium phosphate. It has the same structure as Lithium iron phosphate, and is of orderly olivine structure. Both Lithium iron phosphate and Lithium iron phosphate have the same advantages of low cost, high safety performance, high thermal stability, no spontaneous combustion during acupuncture and overcharge, long life, safety and no explosion risk. It can be said that it has the advantages of Manganese(II) phosphate lithium phosphate and lithium iron phosphate, and it can also make up for the shortcomings of Lithium iron phosphate with low energy density. Therefore, it is also known as the "upgraded version of Lithium iron phosphate".
Parameter comparison between Lithium iron phosphate and lithium manganese iron phosphate
1. The battery has a higher energy density and stronger endurance.
The theoretical capacity of lithium manganese iron phosphate is the same as that of Lithium iron phosphate, which is 170mAh/g; However, the electrode potential of lithium manganese iron phosphate relative to Li/Li is 4.1V, which is much higher than 3.4V of Lithium iron phosphate, and it is located in the stable electrochemical window of the organic electrolyte system. Compared with Lithium iron phosphate, it is increased by 0.7V, and the platform voltage is increased by 20%, thus promoting the energy density of Manganese(II) phosphate from 578Wh/kg to 697Wh/kg under the same volume and mass.
2. Lower manufacturing costs.
The main difference between the amount of materials used for lithium manganese phosphate and Lithium iron phosphate lies in the change of the amount of manganese source required. Each kWh of Lithium iron phosphate cathode requires 0.61kg of iron source, while each kWh of lithium manganese phosphate cathode requires 0.13kg of iron source+0.38kg of manganese source.
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