Preparation method of positive electrode material (carbon-coated iron-manganese-lithium phosphate) of lithium ion battery

Abstract

The invention discloses a preparation method of a positive electrode material (carbon-coated iron-manganese-lithium phosphate) of a lithium ion battery, and relates to the technical field of preparation of positive electrode materials of lithium ion batteries. The preparation method comprises the following steps: preparing a high-activity iron-manganese precursor mixture by oxidation-reduction reaction, and treating a lithium source, a phosphorus source, a carbon source and the iron-manganese precursor mixture by the steps of mixing, drying, sintering and the like so as to obtain the positive electrode material (carbon-coated iron-manganese-lithium phosphate) of the lithium ion battery. The preparation method has the characteristics of high reaction activity of the synthesized iron-manganese precursor, no need of the grinding procedure in mixing materials, low sintering temperature, short temperature-maintaining time and the like; the prepared positive electrode material (carbon-coated iron-manganese-lithium phosphate) of the lithium ion battery has the advantages that the first discharging capacity is up to 155.2mAh/g when the rate is 0.1C, the discharging capacity is more than 140mAh/g when the rate is 0.2C, so that the good electro-chemical performance and rate performance are shown, and simultaneously, all performance indexes of the material give consideration to the processing performance. Compared with the lithium iron phosphate material, the working voltage of the synthesized material and specific energy of the material are increased, so that the benefit is brought for increasing the specific energy density of a battery core at the later stage.

Description

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AI Technical Summary

Benefits of technology

This patented technology describes methods for making certain types of lithiophenium compounds that can be used in secondary cells (referred to also referred to herein interchangeably), specifically LiFeMnPO4. These new compositions have improved properties compared to existing ones due to their unique structure or composition. They exhibit better charge storage capabilities at higher temperatures while maintaining excellent electrical conductivity. Additionally, they provide longer lifetimes during use over multiple cycles through efficient charging and discharging processes.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the energy content of luminous redox flow secondary cells that use LiFePO_4. Current methods involve modifying or adding certain substances like lanthanoid compounds into these compositions, resulting in lower operational voltages and reduced cell capacities compared to what was previously possible due to their poorer properties than existing ones.