Modified lithium iron phosphate, preparation method thereof and lithium ion battery

A lithium iron phosphate, modified technology, applied in the direction of secondary batteries, battery electrodes, chemical instruments and methods, etc., can solve the problems of low conductivity, difficulty in meeting the actual needs of high rate performance of electric vehicle power batteries, and amorphous

Pending Publication Date: 2022-04-12
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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Problems solved by technology

[0007] The main purpose of the present invention is to provide a kind of modified lithium iron phosphate, its preparation method and lithium ion battery, to solve the problem that the carbon coating layer in the existing carbon-coated lithium iron phosphate material is usually in an amorphous state, resulting in its The low conductivity makes it difficult to meet the actual needs of electric vehicle power batteries for high rate performance

Method used

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  • Modified lithium iron phosphate, preparation method thereof and lithium ion battery
  • Modified lithium iron phosphate, preparation method thereof and lithium ion battery
  • Modified lithium iron phosphate, preparation method thereof and lithium ion battery

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preparation example Construction

[0025] As described in the background technology, the carbon coating layer in the existing carbon-coated lithium iron phosphate materials is usually in an amorphous state, resulting in low electrical conductivity, which is difficult to meet the actual demand for high rate performance of electric vehicle power batteries The problem. In order to solve the above technical problems, the application provides a method for preparing modified lithium iron phosphate. The method for preparing modified lithium iron phosphate includes: performing a controlled oxidation reaction between chemically expanded graphite and concentrated sulfuric acid containing an oxidant to obtain a controlled oxidation Chemically expanded graphite; in the presence of a solvent, the chemically expanded graphite, lithium source compound, phosphorus source compound and iron source compound are mixed and then subjected to a hydrothermal synthesis reaction to obtain a modified lithium iron phosphate precursor; unde...

Embodiment 1

[0042] The preparation method of modified lithium iron phosphate comprises:

[0043] Step 1, soak 2g of graphite (Sigma, 50 mesh) raw materials in concentrated sulfuric acid (180mL) containing hydrogen peroxide (20mL), let it stand for reaction at normal temperature and pressure for 24h, after washing and filtering, add the above-mentioned chemically expanded graphite to the solution containing 2g In the concentrated sulfuric acid of potassium permanganate oxidant, stir at 35°C for 2 hours to complete the controlled oxidation reaction, and obtain chemically expanded graphite with controlled oxidation;

[0044] Step 2, disperse the controlled oxidation chemical expansion graphite obtained in step 1 in the mixed solution of water and ethylene glycol, and then mix lithium hydroxide, phosphoric acid, ferrous sulfate, tetraisopropyl titanate, and controlled oxidation expansion graphite according to the weight ratio The ratio of 1:1.36:2.11:0.028:0.11 is added to the dispersion of t...

Embodiment 2

[0049] The difference from Example 1 is: based on the total weight of chemically expanded graphite, lithium source compound, phosphorus source compound and iron source compound for controlling oxidation, the percentage of titanium element is 0.20%, and other conditions are the same as in Example 1 .

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Abstract

The invention provides modified lithium iron phosphate, a preparation method thereof and a lithium ion battery. The preparation method of the modified lithium iron phosphate comprises the following steps: carrying out controlled oxidation reaction on chemical expanded graphite and concentrated sulfuric acid containing an oxidant to obtain controlled oxidation chemical expanded graphite; in the presence of a solvent, mixing the chemically expanded graphite subjected to oxidation control, a lithium source compound, a phosphorus source compound and an iron source compound, and performing hydrothermal synthesis reaction to obtain a modified lithium iron phosphate precursor; and calcining the modified lithium iron phosphate precursor in inert gas to obtain the modified lithium iron phosphate. The modified lithium iron phosphate prepared by the preparation method has relatively good conductivity, so that the modified lithium iron phosphate has very excellent cycle performance and high rate performance in the application process.

Description

technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a modified lithium iron phosphate, a preparation method thereof and a lithium ion battery. Background technique [0002] In recent years, rechargeable lithium-ion batteries have become ideal batteries for portable electronics such as cell phones, laptops, and Bluetooth headsets, as well as electric vehicles. Nevertheless, current lithium-ion batteries still face many challenges in automotive industry applications, such as safety, cost, cycle stability, energy density, etc., and the performance of lithium-ion batteries largely depends on the electrode materials used. Cathode materials with high safety, low cost, and excellent electrochemical performance are crucial for the large-scale development of lithium batteries. [0003] Lithium iron phosphate cathode material with olivine structure has a high theoretical specific capacity (170mAh / g), a flat discharge platfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45C01B32/225H01M4/58H01M10/0525
Inventor 刘意成陈巍褚春波张耀陈子龙王明旺
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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