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A kind of pressure-controlled deagglomeration synthesis method of lithium iron phosphate cathode material

A cathode material, lithium iron phosphate technology, used in phosphates, phosphorus oxoacids, phosphorus compounds, etc.

Active Publication Date: 2018-01-02
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been mentioned above that the fine processing of powder materials can be achieved by means of liquid phase combined with mechanical grinding, and even laser bombardment is used. These methods are suitable for diamond materials with high hardness, high hardness and good stability, but it is difficult to transition In the deagglomeration process of lithium iron phosphate materials

Method used

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  • A kind of pressure-controlled deagglomeration synthesis method of lithium iron phosphate cathode material
  • A kind of pressure-controlled deagglomeration synthesis method of lithium iron phosphate cathode material
  • A kind of pressure-controlled deagglomeration synthesis method of lithium iron phosphate cathode material

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Effect test

Embodiment 1

[0021] 1) The analytically pure FePO 4 2H 2 After removing water at high temperature, O is added to the inner body (4) of the ultrasonic-assisted microwave reactor, and Li is added according to the molar ratio of Li:Fe=1.02:1. 2 CO 3 , and then add Vc aqueous solution with a concentration of 20% according to the ratio of the total volume ratio of 1:0.5, and turn on ultrasonic assistance (9) and microwave (8) heating at the same time, control the temperature of the material at 50°C for 10 minutes, and form precursor A. Precursor A was sintered at 300°C for 30 minutes under the protection of nitrogen in a rotary furnace, and then rapidly cooled to obtain powder precursor B;

[0022] 2) After weighing the precursor B and putting it into the inner body (4) of the ultrasonic-assisted microwave reactor, weigh the glucose aqueous solution with a concentration of 50% according to the mass ratio of 1: 0.2, and turn off the ultrasonic auxiliary after 5 minutes. The lid of the microwa...

Embodiment 2

[0029] 1) The analytically pure FePO 4 2H 2 After removing water at high temperature, O is added to the inner body (4) of the ultrasonic-assisted microwave reactor, and Li is added according to the molar ratio of Li:Fe=1.02:1. 2 CO 3 , and then add a 30% Vc aqueous solution according to the ratio of the total volume ratio of 1:0.6, and turn on the ultrasonic auxiliary (9) and microwave (8) heating at the same time, control the temperature of the material at 40°C, and last for 10 minutes to form the precursor A. Precursor A was sintered at 300°C for 30 minutes under the protection of nitrogen in a rotary furnace, and then rapidly cooled to obtain powder precursor B;

[0030] 2) After weighing the precursor B and putting it into the inner body (4) of the ultrasonic-assisted microwave reactor, weigh the glucose aqueous solution with a concentration of 40% according to the mass ratio of 1: 0.2, and turn off the ultrasonic auxiliary after 5 minutes. The lid of the microwave reacto...

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Abstract

The invention aims to provide a pressure-controlling deaggregating synthetic method for a lithium iron phosphate positive electrode material. The method is suitable for the lithium iron phosphate positive electrode material with certain strength, with a coating layer on the surface of the material, and with small primary grain diameters. The pressure-controlling deaggregating synthetic method performs the reaction, uniform mixing and coating of the materials in gradient through an ultrasonic microwave reaction kettle; and a uniform reaction and a controllable process of the approximate nanoscale raw materials are finally realized. The prepared battery material is relatively high in particle uniformity and consistency; meanwhile, the powder is small in particles; and therefore, the lithium iron phosphate material is higher in the conductivity and the ion diffusion rate, and the electroelectroless performance of the material is greatly improved.

Description

technical field [0001] The invention relates to a preparation method of a lithium iron phosphate positive electrode lithium ion battery material, in particular to a pressure-controlled deagglomeration synthesis method of a lithium iron phosphate positive electrode material. Background technique [0002] LiFePO 4 It is currently the most common anode material for lithium-ion batteries. It has a stable olivine structure and can reversibly intercalate and deintercalate lithium ions. Moreover, it has high energy density, stable performance, high safety, environmental friendliness and cheaper price. It is considered to be the most potential cathode material for lithium-ion batteries. Pure phase LiFePO 4 The conductivity is small (about 10 -9 S / cm), the ion diffusion coefficient is low, which limits its discharge capacity at high current density, and its poor cycle performance limits LiFePO 4 Applications. In view of such shortcomings, various manufacturers and universities ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B25/26C01B25/45H01M10/0525
CPCC01B25/26C01B25/265C01B25/45H01M4/5825H01M10/0525Y02E60/10
Inventor 关成善宗继月孟博杜显振
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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