A kind of preparation method of nano lithium ferrite

A lithium ferrite, nanotechnology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problem of affecting the capacity and discharge platform of lithium iron phosphate, failing to enhance the conductivity of lithium iron phosphate, lithium ferrite once Large particle size and other problems, to achieve the effect of low cost, high conductivity and heat, and high crystallinity

Active Publication Date: 2020-09-25
四川朗晟新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of preparation method of nano lithium ferrite
  • A kind of preparation method of nano lithium ferrite
  • A kind of preparation method of nano lithium ferrite

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Embodiment 1

[0042] A preparation method of nano-lithium ferrite, which comprises the following steps:

[0043]Add ferrous ammonium sulfate crystals into hot pure water, stir and dissolve to prepare a solution, add sodium acetate to adjust the pH of the solution to 2-2.5 to obtain a ferrous solution, add battery-grade lithium carbonate to pure water to slurry, and then introduce carbon dioxide under stirring , to obtain a clear lithium bicarbonate solution, the mol ratio of the ferrous ammonium sulfate in the ferrous solution to the lithium bicarbonate in the lithium bicarbonate solution is 1:5.03.

[0044] The detection data of ferrous ammonium sulfate are as follows:

[0045] project Fe Ca Na Mg Zn Cu Test data 14.09％ 21.9ppm 29.7ppm 23.9ppm 19.8ppm 0.5ppm Ni Cd Fe 3+

Ti Al Water insoluble matter pH 11.9ppm 0.7ppm 216ppm 2.9ppm 4.7ppm 67ppm 1.59

[0046] The concentration of ferrous iron in the finally obtaine...

Embodiment 2

[0060] A preparation method of nano-lithium ferrite, which comprises the following steps:

[0061] 1) Add ferrous ammonium sulfate crystals into hot pure water, stir and dissolve to prepare a solution, add sodium acetate to adjust the pH of the solution to 2.1 to obtain a ferrous solution, add battery-grade lithium carbonate to pure water to slurry, and then introduce carbon dioxide under stirring , to obtain a clear lithium bicarbonate solution;

[0062] 2) Add the bottom liquid in the reaction kettle, the bottom liquid is a mixed solution of urea and polyethylene glycol, then raise the temperature to 97°C, add the ferrous solution, lithium bicarbonate solution, and acid-base regulator to the reaction kettle Inside, the stirring speed is maintained at 280r / min, the reaction temperature is 98°C, the pH of the reaction process is 7.2, and the feeding time is 1h. After the feeding is completed, stir and react at this temperature for 2h to obtain a slurry;

[0063] 3) Transfer t...

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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 these cathode materials themselves have many defects, lithium cobalt oxide 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 environmental friendliness, but the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/0525C01B25/26C01B25/45C01B25/37B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B25/26C01B25/375C01B25/45H01M4/5825H01M10/0525Y02E60/10
Inventor 王柯娜
Owner 四川朗晟新材料科技有限公司
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