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Composite modified lithium ion battery cathode material and preparation method thereof

A lithium-ion battery, cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unstable cycle performance, high hygroscopicity, and reduced discharge specific capacity or energy density of materials to improve cycle performance. and stability, the effect of avoiding decomposition

Inactive Publication Date: 2015-05-13
ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although nickel-cobalt-lithium aluminate has many advantages, its application is limited due to the disadvantages of high hygroscopicity and insufficient cycle performance. Therefore, the modification of materials has become an urgent problem to be solved.
At present, there are many studies on coating metal oxide on the surface of nickel-cobalt lithium aluminate to improve the cycle performance and safety performance of the material, but the metal oxide is not electrochemically active, and the coating modification of the material will lead to the degradation of the material. Decreased discharge specific capacity or energy density
Another modification method is to dope the material with metal elements to improve the rate performance of the material, but it does not improve the cycle performance of the material.

Method used

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  • Composite modified lithium ion battery cathode material and preparation method thereof
  • Composite modified lithium ion battery cathode material and preparation method thereof
  • Composite modified lithium ion battery cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Add Al2O3 to the glucose solution and stir at a high speed for 30 minutes, then perform ultrasonication for 10 minutes, and then perform high-speed stirring and ultrasonic circulation for 3 to 5 times, and mix well to form a uniform mixed solution; the positive electrode material LiNi 0.8 co 0.15 al 0.05 o 2 Add it into the above mixture under stirring conditions, so that the coating material is uniformly coated on the surface of the active material particles; dry the mixture for 4-8 hours, and calcinate the dried solid material at 500 ° C for 6 hours, then cool and pulverize and sieving to obtain the modified cathode material.

[0028] The electrochemical performance test of the material is tested at 25°C with the blue battery test system. The rate performance test conditions: the test voltage range is 3V to 4.3V, 0.2C charge and discharge once, 0.2C charge 0.5C / 1C / 5C / 10C Each discharge once; cycle performance test conditions: the test voltage range is 3V ~ 4.3V, ch...

Embodiment 2

[0030] Magnesium oxide was added to the starch solution and stirred at high speed for 30 minutes, and then ultrasonicated for 10 minutes, followed by high-speed stirring and ultrasonic cycle for 3 to 5 times, and mixed evenly to form a uniform mixed solution; the positive electrode material LiNi 0.8 co 0.15 al 0.05 o 2 Add it into the above mixed liquid under the condition of stirring, so that the coating material is evenly coated on the surface of the active material particles; dry the mixture for 4-8 hours, calcinate the dried solid material at 600 ° C for 5 hours, cool and pulverize and sieving to obtain the modified cathode material.

Embodiment 3

[0032] Add titanium dioxide and graphite to anhydrous ethanol and stir at high speed for 30 minutes, then perform ultrasonication for 10 minutes, successively high-speed stirring and ultrasonic circulation 3 to 5 times, and mix uniformly to form a uniform mixed solution; the positive electrode material LiNi 0.8 co 0.15 al 0.05 o 2 Add it into the above mixed liquid under the condition of stirring, so that the coating material is evenly coated on the surface of the active material particles; dry the mixture for 4-8 hours, calcinate the dried solid material at 600 ° C for 5 hours, cool and pulverize and sieving to obtain the modified cathode material.

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Abstract

The invention relates to a composite modified lithium ion battery cathode material and a preparation method thereof. The chemical general formula of the composite modified lithium ion battery cathode material is LiNi(1-a-b)CoaAlbO2 / M, wherein 0.1<a<0.3, 0.01<b<0.2, and M is a composite coating layer of one of metallic oxides and carbon; the mass ratio of the composite coating layer to the LiNi(1-a-b)CoaAlbO2 is (0.001-0.05):1; the mass ratio of the metallic oxide in the composite coating layer to the carbon is 1: (1-10); the thickness of the composite coating layer is 4-10 mm. The composite modified lithium ion battery cathode material and the preparation method thereof have the maximum advantages and benefits that the cycling performance and the stability of a lithium ion battery are improved; a carbon source forms amorphous carbon under the hypoxic conditions, so that a channel is provided for the migration of lithium ions, and not only is the electronic conductivity of the cathode material is improved, but also the rate capability of the cathode material is greatly improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a composite modified lithium ion battery cathode material and a preparation method thereof. Background technique [0002] As a new generation of green and environment-friendly power supply, lithium-ion batteries have the advantages of high energy density, high voltage, small self-discharge, and no memory effect. They are widely used in mobile phones, cameras, notebook computers, power tools, electric bicycles, and electric vehicles. . With the rapid development of electronic products, the energy and power requirements of lithium-ion batteries are getting higher and higher, and the positive electrode material of lithium-ion batteries is an important part of lithium-ion batteries and the main factor affecting the performance of lithium-ion batteries. Compared with the industrialized positive electrode materials lithium cobalt oxide, lithium manganese oxide, lithium nickel coba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/366H01M4/483H01M4/485H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 毛玉琴韩珽
Owner ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
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