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Lithium lanthanum titanate-lithium titanate coated lithium nickel cobalt aluminate cathode material and preparation method thereof

A technology coated with nickel-cobalt lithium aluminate and lithium titanate, which is applied in positive electrodes, battery electrodes, active material electrodes, etc., can solve the problems of unsatisfactory improvement effects, achieve excellent cycle stability, accelerate migration rate, The effect of excellent electrochemical performance

Active Publication Date: 2019-01-01
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

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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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  • Lithium lanthanum titanate-lithium titanate coated lithium nickel cobalt aluminate cathode material and preparation method thereof
  • Lithium lanthanum titanate-lithium titanate coated lithium nickel cobalt aluminate cathode material and preparation method thereof
  • Lithium lanthanum titanate-lithium titanate coated lithium nickel cobalt aluminate cathode material and preparation method thereof

Examples

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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 to make Ti:La 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-lithium aluminate) PVP (polyvinylpyrrolidone) was 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-lithium aluminate 1:100;

[0054] (3) Deionized water was added dropwise under stirring conditions 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 sol...

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, and after fully stirring, add a certain amount of lanthanum acetate to make the Ti:La ratio 1:2, and then fully stir until a colorless and 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, in which titanium and The molar ratio of nickel cobalt lithium aluminate is 0.5:100;

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

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. After fully stirring, add a certain amount of lanthanum nitrate to make the Ti:La ratio 2:1, and then fully stir until a colorless and transparent solution is formed;

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

[0068] (3) Deionized water was added dropwise under stirring conditions 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...

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Abstract

The invention relates to a lithium lanthanum titanate-lithium titanate coated lithium nickel cobalt aluminate cathode material and preparation method thereof. The preparation method comprises the following steps: S1, dissolving an organic titanium source and a lanthanum source in an organic solvent, and stirring to obtain a mixed solution; 2, adding lithium nickel cobalt aluminate and a surfactantinto the mixed solution, and stirring at 60-80 DEG C to obtain a suspension; 3, adding water drop by drop under the stirring condition, continuing stirring until the organic solvent volatilizes completely, and drying to obtain the coating material; S4, calcining the coating material at 450-650 DEG C for 5-10 hours to obtain the lanthanum lithium titanate-lithium titanate coated lithium nickel cobalt aluminate cathode material. The preparation method provided by the invention is simple in operation and easy to industrialize, and is suitable for popularizing and using in the field. The preparedlithium titanate-lithium lanthanum titanate coated lithium nickel cobalt aluminate cathode material 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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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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