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A method for coating a perovskite structural material on that surface of a positive electrode particle

A perovskite structure and surface coating technology, applied in structural parts, battery electrodes, electrical components, etc., can solve problems such as low electronic conductance, unusable positive electrode materials, and inability to export/import electrons from positive particles, and achieve improved Electronic conductivity, improved cycle stability, lower cost effects

Active Publication Date: 2019-01-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solid electrolyte Li 3x La 2 / 3-x TiO 3 The electronic conductivity of the coating is too low, and the electrons of the positive electrode particles cannot be exported / imported after coating, making the positive electrode material unusable

Method used

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  • A method for coating a perovskite structural material on that surface of a positive electrode particle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of LiNi 0.8 co 0.1 mn 0.1 o 2 ~ Li 0.33 La 0.557 Ti 0.9 Ni 0.1 o 3 The positive electrode material with core-shell structure, the ratio of substrate to coating material is 30:1.

[0025] The preparation method is as follows:

[0026] (1) According to the composition of the coating layer, prepare a solution with a concentration of 0.1mol / L, in which La(NO 3 ) 3 ·6H 2 O is 0.0557mol / L, NiSO 4 ·6H 2 O is 0.01mol / L, Ti(SO 4 ) 2 It is 0.09mol / L. Dissolve the above salt in deionized water, stir well, add H 2 SO 4 , adjust its pH value to about 2 to obtain a mixed salt solution. Prepare 0.5mol / L ammonia water and 1mol / L NaOH solution, and stir evenly;

[0027] (2) Configure the dispersion of the matrix precursor particles, and the matrix precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 The particles are added to deionized water, containing 0.2mol of matrix particles per liter, and stirred with a magnetic stirrer at a stirring speed of 1000rpm to form a ...

Embodiment 2

[0033] Preparation of LiNi 0.9 co 0.05 mn 0.05 o 2 ~ Li 0.33 La 0.557 Ti 0.8 co 0.2 o 3 Core-shell structure positive electrode material, the ratio of substrate to cladding material is 40:1.

[0034] The preparation method is as follows:

[0035] (1) According to the composition of the coating layer, prepare a solution with a concentration of 0.100mol / L, where La(NO 3 ) 3 ·6H 2 O is 0.0557mol / L, CoSO 4 ·7H 2 O is 0.020mol / L, Ti(SO 4 ) 2 It is 0.080mol / L. Stir it well, add dropwise H 2 SO 4 , adjust the pH value to about 2 to obtain a mixed salt solution. Prepare 0.5mol / L ammonia water and 1mol / L NaOH solution, and stir evenly;

[0036] (2) Configure the dispersion of the matrix precursor particles, and the matrix precursor Ni 0.9 co 0.05 mn 0.05 (OH) 2 The particles are added to deionized water, containing 0.2mol of matrix particles per liter, and stirred with a magnetic stirrer at a stirring speed of 1000rpm to form a uniform suspension;

[0037] (3) T...

Embodiment 3

[0042] Preparation of Li[Li 0.2 Ni 0.13 co 0.13 mn 0.54 ]O 2 ~ Li 0.33 La 0.557 Ti 0.8 Ni 0.2 o 3 Core-shell structure positive electrode material, the molar ratio of substrate and cladding layer is 50:1.

[0043] The preparation method is as follows:

[0044] (1) According to the composition of the coating layer, prepare a solution with a concentration of 0.1mol / L, in which La(NO 3 ) 3 ·6H 2 O is 0.0557mol / L, Ni(SO 4 ) 2 ·6H 2 O is 0.020mol / L, Ti(SO 4 ) 2 It is 0.08mol / L. Stir it well, add dropwise H 2 SO 4 , adjust the pH value to about 2 to obtain a mixed salt solution. Prepare 0.5mol / L ammonia water and 1mol / L NaOH solution, and stir evenly;

[0045] (2) Configure the dispersion of the matrix precursor particles, and the matrix precursor Ni 1 / 6 co 1 / 6 mn 4 / 6 CO 3 The particles are added to deionized water, containing 0.2mol of matrix particles per liter, and stirred with a magnetic stirrer at a stirring speed of 1000rpm to form a uniform suspension...

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Abstract

The invention relates to a method for coating a perovskite structure material on the surface of a positive electrode particle, and belongs to the technical field of positive electrode material for lithium ion batteries. Firstly, the coating layer was deposited on the surface of matrix precursor by coprecipitation method according to the composition ratio of perovskite structure to obtain the precursor powder with core-shell structure, and then the composite cathode material with core-shell structure was obtained by sintering the coated precursor powder with lithium source. A matrix precursor can be a precursor of a spinel structure cathode material LiM2O4 and / or a precursor of a layered structure cathode material LiMO2 and / or a precursor of a lithium-rich manganese base cathode material xLi2MnO3. (1-x) LiMO2, and that sintered clad layer has ion-ylectronically mixed conducting perovskite structural materials. The invention can regulate the performance of the surface coating layer, improve the cycle stability of the positive electrode material, and has the advantages of simple process, convenient operation, low material cost, good popularization and practicability.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a method for preparing a composite positive electrode material with a core-shell structure. Background technique [0002] With the development of human beings and the progress of science and technology, the demand and consumption of energy are increasing day by day. Energy sources such as coal, oil, and natural gas have been exploited and utilized on a large scale, and their use will cause environmental pollution, such as greenhouse response and acid rain. Therefore, the search and development of new energy sources has become one of the hot spots in contemporary society. [0003] As one of the representatives of new energy, batteries play an important role in the development of modern society. At present, common batteries mainly include dry batteries, lead storage batteries and lithium batteries. Among them, lithium batteries have...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M10/0525H01M4/48
CPCH01M4/366H01M4/48H01M4/485H01M4/505H01M10/0525Y02E60/10
Inventor 黄冰心程续王喆强文江
Owner UNIV OF SCI & TECH BEIJING
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