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A kind of preparation method of nanometerization olivine type lithium-ion battery cathode material

A lithium-ion battery, olivine-type technology, used in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as low electronic conductivity, and achieve high ionic and electronic conductivity, excellent low-temperature performance, and high capacity. Effect

Active Publication Date: 2016-04-13
XIAMEN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low ionic and electronic conductivity of olivine-type positive electrode materials, and provide a preparation method of nano-sized olivine-type lithium-ion battery positive electrode materials to synthesize uniform carbon-coated nanoscale particles with high Specific capacity, high rate performance and good cycle stability

Method used

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  • A kind of preparation method of nanometerization olivine type lithium-ion battery cathode material
  • A kind of preparation method of nanometerization olivine type lithium-ion battery cathode material
  • A kind of preparation method of nanometerization olivine type lithium-ion battery cathode material

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preparation example Construction

[0033] In the preparation method of the above-mentioned nano-sized olivine-type positive electrode material, the antioxidant in step (2) is aniline, ascorbic acid, citric acid, phenol, diphenol, tocopherol, butylated hydroxytoluene, ascorbic acid sodium salt, calcium One or more of salt.

[0034] In the above-mentioned preparation method of the nano-sized olivine-type positive electrode material, except for lithium iron phosphate and lithium iron silicate, other materials may not need to pass through protective gas and add antioxidant in step (2).

[0035] In the above-mentioned preparation method of nano-sized olivine-type positive electrode materials, in addition to synthesizing lithium iron phosphate, it can also be used to synthesize other olivine-type positive electrode materials, such as lithium manganese phosphate, lithium nickel phosphate, lithium cobalt phosphate, and cobalt silicate. Lithium, lithium iron silicate, lithium manganese silicate.

[0036] In the prepara...

Embodiment 1

[0042] 30mL of oleylamine was heated to 100°C under nitrogen protection and stirred. FeCl 2 , 1.014g dissolved in 15ml ethanol, LiAc·2H 2 After O, 0.816g was dissolved in 15ml of ethanol, they were added to the appeal of oleylamine. Add 1 mL of aniline and react at 100°C for 30 minutes. Add phosphoric acid mixture (0.55mL > 85% phosphoric acid + 5mL ethanol), react at 100°C for 2 hours, then raise the temperature from 100°C to 200°C. And maintained at 200 degrees for 4 hours. Cool to room temperature. Transfer out the reaction bottle, add ethanol to precipitate out. Then wash with a small amount of cyclohexane, then add ethanol to precipitate out. Wash twice. Then vacuum dry at 64°C overnight. Burn at 600°C for 4 hours under an argon atmosphere of 5% H2. to get the finished product. Such as figure 1 SEM characterization of the obtained product is shown. The charge-discharge curve at 0.5C is as follows figure 2 shown.

Embodiment 2

[0044] 60mL oleylamine was heated to 100°C under stirring, Mn(Ac) 2 4H 2 O, 3.92g dissolved in 25ml ethanol, LiAc·2H 2 After O, 1.632g was dissolved in 25ml of ethanol, they were added to the appeal of oleylamine. React at 100°C for 60 minutes. Add phosphoric acid mixture (1.1mL > 85% phosphoric acid + 8mL ethanol), react at 100°C for 2 hours, and then raise the temperature from 100°C to 200°C. And maintained at 200 degrees for 4 hours. Cool to room temperature. Transfer out the reaction bottle, add ethanol to precipitate out. Then wash with a small amount of cyclohexane, then add ethanol to precipitate out. Wash twice. Then vacuum dry at 64°C overnight. Under a nitrogen atmosphere, it was fired at 600° C. for 4 hours. to get the finished product. Such as image 3 Shown, its charge and discharge curve at 0.5C.

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Abstract

The invention discloses a method for preparing a nanocrystallized olivine-type anode material of lithium ion batteries. Firstly, raw materials are dispersed or dissolved in a solvent; the raw materials comprise a metallic compound containing lithium, a compound containing nonmetal Y, and a compound containing metal M; the solvent at least comprises one or a plurality of compounds with the general formula of CxHyOmNnSz; the x, the y, the z, the m and the n are integer numbers respectively; the x is more than or equal to two, the y is more than or equal to two, the m is less than or equal to six and more than or equal to zero, the n is less than or equal to six and more than or equal to zero and the z is less than or equal to six and more than or equal to zero. The raw material solution obtained in the first step is subjected to synthetic reaction in a certain solvent system to obtain a precursor. The precursor is subjected to pyrolytic reaction to obtain the nanocrystallized olivine-type anode material of the lithium ion batteries finally. By the method disclosed by the invention, nanoscale particles which are evenly covered by carbon can be synthetized, and the particles have the advantages of high specific capacity, high rate capability and good cycling stability.

Description

technical field [0001] The invention belongs to the technical field of preparation of energy materials, and in particular relates to a preparation method of anode materials of nanometerized olivine lithium ion batteries. Background technique [0002] In modern society, due to the depletion of fossil energy, people should gradually get rid of their dependence on coal, oil, and natural gas, and gradually develop new energy sources such as solar energy, wind energy, and nuclear energy. With the development of population and economy, the demand for energy is increasing, and more and more portable electronic devices, such as mobile phones, cameras, and notebook computers, all require small rechargeable and dischargeable energy sources with small size, large capacity, and light weight. growing demand. Lithium-ion batteries have gradually become a new generation of energy media due to their excellent cycle stability, high energy density, and no memory effect. At the same time, lit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B25/45
CPCY02E60/10
Inventor 郑明森董全峰范镜敏
Owner XIAMEN UNIV
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