Lithium iron oxide material and preparation method thereof

Abstract

The invention belongs to the field of electrochemistry, and discloses a lithium iron oxide material, and a preparation method thereof. The preparation method comprises following steps: 1, an iron source, a lithium source, a carbon source, and deionized water are mixed to obtain a mixed solution; 2, the mixed solution is subjected to grinding to control the particle size of solid particles in the mixed solution to be 0.4<mu>m or lower; 3, after grinding, the mixed solution is subjected to spray drying to obtain a lithium iron oxide precursor; and 4, the lithium iron oxide precursor is subjectedto sintering, and crushing so as to obtain the lithium iron oxide material. The using amount of the carbon source is controlled so that the carbon coating layer content in the lithium iron oxide material accounts for 0.5 to 15wt%; the molar ratio of the lithium in the lithium source to the iron in the iron source is controlled to be (5-25) : 1. The prepared lithium iron oxide material possesses excellent irreversibility and excellent capacity performance, so that battery energy density can be increased.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a lithium ferrite material and a preparation method thereof. Background technique [0002] With the development of the market and the continuous improvement of materials and battery technology, the requirements of terminal enterprises for the energy density of lithium-ion batteries are also constantly increasing. At present, common methods to increase the energy density of lithium-ion batteries include using high-nickel ternary materials with high specific capacity as positive electrode materials, using silicon-based materials with higher specific capacity as negative electrode materials, and increasing the working voltage of positive electrode materials and compaction of materials. density etc. [0003] However, during the first charge and discharge process of lithium-ion batteries, the structural changes of positive electrode materials, the shedding of active materials, and the...

AI Technical Summary

Problems solved by technology

[0003] However, during the first charge and discharge process of lithium-ion batteries, the structural changes of positive electrode materials, the shedding of active materials, and the formation of solid electrolyte interfacial films, etc., will reduce the reversible capacity and first-time efficiency of the battery, resulting in a decrease in battery energy density.

Images