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A kind of lanthanum lithium titanate-lithium titanate coated nickel cobalt lithium aluminate positive electrode material and preparation method thereof

A technology coated with nickel-cobalt-aluminate lithium and lithium titanate, applied in positive electrodes, battery electrodes, active material electrodes, etc., can solve problems such as unsatisfactory improvement effects, and achieve excellent electrochemical performance and cycle stability, The effect of stable chemical properties and simple operation

Active Publication Date: 2022-02-08
乳源东阳光新能源材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] To this end, strategies such as coating, doping, and complex structural design have been adopted to improve the rate performance and cycle performance of materials, but the improvement effects are not satisfactory.

Method used

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  • A kind of lanthanum lithium titanate-lithium titanate coated nickel cobalt lithium aluminate positive electrode material and preparation method thereof
  • A kind of lanthanum lithium titanate-lithium titanate coated nickel cobalt lithium aluminate positive electrode material and preparation method thereof
  • A kind of lanthanum lithium titanate-lithium titanate coated nickel cobalt lithium aluminate positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] This embodiment provides a nickel-cobalt-lithium-aluminate cathode material coated with lithium lanthanum titanate-lithium titanate. Prepared by the following preparation method.

[0052] (1) Dissolve tetrabutyl titanate in an appropriate amount of ethanol solvent, after fully stirring, add a certain amount of lanthanum nitrate so that Ti: La is 1:1, and then fully stir until a colorless transparent solution is formed;

[0053] (2) LiNi 0.815 co 0.15 Al 0.035 o 2 and 1wt% (relative to nickel-cobalt-aluminate lithium) of PVP (polyvinylpyrrolidone) were added to the above solution, and placed in a constant water bath at 80°C to fully stir to form a uniform suspension, wherein the molar ratio of titanium and nickel-cobalt-aluminate lithium 1:100;

[0054] (3) Adding deionized water dropwise under stirring conditions to slowly hydrolyze the tetrabutyl titanate, wherein the molar ratio of the amount of deionized water to the added titanium source is 2:1. Stir well unti...

Embodiment 2

[0059] This embodiment provides a nickel-cobalt-lithium-aluminate cathode material coated with lithium lanthanum titanate-lithium titanate. Prepared by the following preparation method.

[0060] (1) Dissolve tetraisopropyl titanate in an appropriate amount of ethylene glycol solvent, after fully stirring, add a certain amount of lanthanum acetate so that Ti: La is 1:2, and then fully stir until a colorless transparent solution is formed;

[0061] (2) LiNi 0.9 co 0.07 Al 0.03 o 2 and 0.5wt% (relative to lithium nickel cobalt aluminate) of CTAB (cetyltrimethylammonium bromide) were added to the above solution, and placed in a constant water bath at 80 ° C to fully stir to form a uniform suspension, wherein titanium and The molar ratio of nickel cobalt lithium aluminate is 0.5:100;

[0062] (3) Adding deionized water dropwise under stirring conditions to slowly hydrolyze the tetrabutyl titanate, wherein the molar ratio of the amount of deionized water to the added titanium s...

Embodiment 3

[0065] This embodiment provides a nickel-cobalt-lithium-aluminate cathode material coated with lithium lanthanum titanate-lithium titanate. Prepared by the following preparation method.

[0066] (1) Dissolve tetrabutyl titanate in an appropriate amount of glycerol solvent, and after fully stirring, add a certain amount of lanthanum nitrate so that Ti:La is 2:1, and then fully stir until a colorless transparent solution is formed;

[0067] (2) LiNi 0.8 co 0.15 Al 0.05 o 2 and 2wt% (relative to nickel-cobalt-aluminate lithium) of PVP (polyvinylpyrrolidone) were added to the above solution, and placed in a constant water bath at 80°C to fully stir to form a uniform suspension, wherein the molar ratio of titanium to nickel-cobalt-aluminate lithium is 2:100;

[0068] (3) Deionized water was added dropwise under stirring to slowly hydrolyze tetrabutyl titanate, wherein the molar ratio of the amount of deionized water to the added titanium source was 2:1. Stir well until the so...

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Abstract

The invention relates to a nickel-cobalt-lithium-aluminate cathode material coated with lanthanum lithium titanate-lithium titanate and a preparation method thereof. The preparation method includes the following steps: S1: dissolving the organic titanium source and the lanthanum source in an organic solvent, and stirring to obtain a mixed solution; S2: adding nickel-cobalt lithium aluminate and a surfactant to the mixed solution, and stirring at 60-80°C to obtain a suspension; S3: add water drop by drop under stirring conditions, continue to stir until the organic solvent is completely volatilized, and dry to obtain the coating material; S4: calcining the coating material at 450-650 °C for 5-10 h to obtain Nickel-cobalt-lithium-aluminate cathode material coated with lanthanum lithium titanate-lithium titanate. The preparation method provided by the present invention is simple to operate, easy to industrialize, and is suitable for popularization and use in this field; the prepared nickel-cobalt-lithium-aluminate cathode material coated with lithium titanate-lanthanum titanate has excellent electrochemical performance and cycle stability.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a nickel-cobalt-lithium-aluminate cathode material coated with lanthanum lithium titanate-lithium titanate and a preparation method thereof. Background technique [0002] In recent years, due to the large-scale exploitation of natural resources, non-renewable energy sources such as oil, natural gas and coal with limited reserves are gradually exhausted; huge change. Under the pressure of these two aspects, people have gradually turned their attention to cleaner and more efficient renewable energy sources, such as: solar energy, wind energy and tidal energy. Lithium-ion batteries, as an energy storage medium, can effectively store these energies. Therefore, developing an energy storage device with excellent comprehensive performance has become the key to solving the problem. In lithium-ion batteries, due to cost and technical considerations, the cathode ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 向伟张军徐春柳罗传喜吕根品
Owner 乳源东阳光新能源材料有限公司
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