Preparation method of composite coated modified lithium iron manganese phosphate positive electrode material

A technology of lithium manganese iron phosphate and positive electrode materials, which is applied in the direction of positive electrodes, active material electrodes, battery electrodes, etc., to achieve the effect of simple and easy coating method

Inactive Publication Date: 2021-05-28
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SiO 2 The agglomeration and pulverization phenomena in the charging and discharging process

Method used

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  • Preparation method of composite coated modified lithium iron manganese phosphate positive electrode material
  • Preparation method of composite coated modified lithium iron manganese phosphate positive electrode material
  • Preparation method of composite coated modified lithium iron manganese phosphate positive electrode material

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Effect test

Embodiment 1

[0028] Embodiment 1, a kind of preparation method of composite coated modified manganese iron phosphate positive electrode material, comprises the following steps:

[0029] (1) Material preparation: Dissolve tetraethyl orthosilicate in ethanol to make an ethanol solution of tetraethyl orthosilicate, then disperse lithium manganese iron phosphate in the ethanol solution of tetraethyl orthosilicate to prepare A dispersion containing silicon source and lithium manganese iron phosphate is obtained; dopamine is dissolved in deionized water to form a dopamine solution;

[0030] (2) Preparation of silicon and carbon precursors co-coated lithium manganese iron phosphate positive electrode material: take dopamine solution and add it to the dispersion containing silicon source and lithium manganese iron phosphate. At this time, the concentration of tetraethyl orthosilicate in the solution is 0.5mmol / L, the concentration of dopamine is 2mmol / L, the mixed reaction liquid is prepared, and ...

Embodiment 2

[0032] Embodiment 2, a kind of preparation method of composite coated modified lithium manganese iron phosphate cathode material, comprises the following steps:

[0033] (1) Material preparation: Dissolve tetramethoxysilane in ethanol to make an ethanol solution of tetramethoxysilane, and then disperse lithium iron manganese phosphate in the ethanol solution of tetramethoxysilane to obtain silicon-containing source and the dispersion of lithium manganese iron phosphate; take dopamine and dissolve it in deionized water to form a dopamine solution;

[0034] (2) Preparation of silicon and carbon precursors co-coated lithium manganese iron phosphate positive electrode material: take the dopamine solution and add it to the dispersion containing silicon source and lithium manganese iron phosphate. At this time, the concentration of tetramethoxysilane in the solution is 0.2mmol / L, the dopamine concentration is 2mmol / L, the mixed reaction solution is prepared, and stirred and reacted ...

Embodiment 3

[0036] Embodiment 3, a kind of preparation method of composite coated modified lithium manganese iron phosphate cathode material, comprises the following steps:

[0037] (1) Material preparation: Dissolve tetrabutyl silicate in ethanol to make an ethanol solution of tetrabutyl silicate, and then disperse lithium manganese iron phosphate in the ethanol solution of tetrabutyl silicate to obtain silicon-containing source and the dispersion of lithium manganese iron phosphate; take dopamine and dissolve it in deionized water to form a dopamine solution;

[0038] (2) Preparation of silicon and carbon precursors co-coated lithium manganese iron phosphate positive electrode material: take dopamine solution and add it to the dispersion containing silicon source and lithium manganese iron phosphate. At this time, the concentration of tetrabutyl silicate in the solution is 1mmol / L, the concentration of dopamine is 0.5mmol / L, the mixed reaction solution is prepared, and stirred and react...

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Abstract

The invention discloses a preparation method of a composite coated modified lithium iron manganese phosphate positive electrode material in the technical field of lithium ion battery positive electrode materials. The preparation method comprises the steps of carrying out composite coating modification on lithium iron manganese phosphate at room temperature by utilizing a mutual promotion effect between silicon source hydrolysis and dopamine polymerization processes; and calcining to obtain the SiO2 and nitrogen-doped carbon co-coated lithium iron manganese phosphate positive electrode material of the lithium battery. By means of composite coating modification of SiO2 and carbon coating, direct contact between the positive electrode material and electrolyte is avoided, harmful side reactions are reduced, the thermal stability of the positive electrode material can be improved, and the conductivity of the positive electrode material can be effectively improved, so that the rate performance and the cycle performance of the positive electrode material can be improved.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium batteries, and in particular relates to a method for preparing a composite-coated modified lithium manganese iron phosphate cathode material. Background technique [0002] Silicon dioxide (SiO 2 ) The synthesis method of the material is simple, the cost is low, and the chemical structure is stable, and there is no pollution to the environment. Therefore, SiO 2 The material has been widely used in lithium batteries. For example, patent CN111668541A ​​modified SiO 2 Application of Microemulsion in the Synthesis of Lithium Battery Gel Electrolyte, SiO 2 The introduction of microemulsion can not only stabilize the gel structure and prevent phase separation; it can also effectively cross-link with the polymer matrix in the gel structure, thereby enhancing the structural stability of the gel electrolyte. Patent CN110416472A by performing SiO on the lithium battery separator 2...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/583H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 史家远徐旭升杨清华陈晓涛刘富亮石斌
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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