Preparation method of nano lithium ferrite

Abstract

The invention discloses a preparation method of nano lithium ferrite. The preparation method comprises: preparing a ferrous solution and a lithium bicarbonate solution; adding a base solution into a reaction kettle; adding the ferrous solution, the lithium bicarbonate solution and an acid-base regulator into the reaction kettle, and reacting to obtain slurry; transferring the slurry into a high-pressure reaction kettle, stirring reaction for 3-5 min at the temperature of 220-250 DEG C under pressure of 0.6-0.9 MPa, after cooling and pressure relief, taking out the material, filtering, and washing to obtain a precipitate; putting the precipitate into a roller bed furnace, calcining for 5-8 h at the temperature of 400-500 DEG C, introducing air in the calcining process, and maintaining the flow velocity of gas in the calcining furnace at 2-3 m / S, and then cooling the calcined material, carrying out air flow crushing, carrying out grading by virtue of a grading wheel, and screening to remove iron, so as to obtain the nano lithium ferrite. The preparation method is simple in process and low in cost, and the obtained nano lithium ferrite is large in specific surface area and uniform inparticle size distribution.

Description

technical field [0001] The invention relates to a preparation method of nano-lithium ferrite, which belongs to the field of lithium battery new energy materials. Background technique [0002] The main materials of lithium batteries include positive and negative electrode materials, electrolyte and diaphragm. Generally speaking, the positive electrode material occupies a core position in the composition of lithium ion battery products. The positive electrode material is the key material that determines the performance of lithium ion batteries. It has been developed A variety of cathode materials. Such as LiCOO 2 , LiMn 2 0 4 , LiNi0 2 and LiFePO 4 , but there are many defects in these positive electrode materials themselves, the price of lithium paving is expensive, LiMn 2 0 4 There is a serious capacity fading problem. Especially in high temperature environment, the attenuation is more serious, LiFePO 4 Low cost, stable discharge, good thermal stability, and environme...

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Problems solved by technology

[0004] However, the primary particle size of lithium ferrite prepared by the general process is large. Only a small amount of doping can not achieve the purpose of enhancing the conductivity of lithium iron phosphate, and the doping amount is too large. Although the conductivity is improved, it affects lithium iron phosphate. capacity and discharge platform

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