High-performance lithium ion battery composite positive electrode material and preparation method thereof

A composite cathode material, lithium-ion battery technology, applied in battery electrodes, active material electrodes, positive electrodes, etc., can solve rare problems, achieve regular particle morphology, inhibit phase transition, and reduce harmful phase transition effects.

Pending Publication Date: 2020-08-18
湖南桑瑞新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have found that Bi 2 WO 6 The application of cathode materials in lithium-ion batteries is rare

Method used

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  • High-performance lithium ion battery composite positive electrode material and preparation method thereof
  • High-performance lithium ion battery composite positive electrode material and preparation method thereof
  • High-performance lithium ion battery composite positive electrode material and preparation method thereof

Examples

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preparation example Construction

[0055] The present invention also provides a method for preparing the above-mentioned high-performance lithium-ion battery composite positive electrode material, which specifically includes the following steps:

[0056] Scheme 1: When a=0, namely Bi 2-a m a WO 6 The cladding layer is specifically Bi 2 WO 6 Covering layer, the preparation method of described high-performance lithium-ion battery composite cathode material is as follows:

[0057] (1) Weigh soluble tungstate and soluble salts containing bismuth source according to the ratio of 2:1 molar ratio of Bi and W elements and dissolve them in solvent, adjust the pH to 9-10, under mechanical stirring or ultrasonic treatment Fully react for 10-30 minutes to generate Bi 2 WO 6 ; Stirring speed and ultrasonic intensity are generally adjusted according to the amount of material to be treated, for example: mechanical stirring speed is 300-1500 rpm.

Embodiment 1

[0081] Example 1: 1 wt% Bi 2 WO 6 Modified lithium ion battery LiNi 0.5 co 0.2 mn 0.3 o 2 Cathode material

[0082] Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 Dissolve 1.39g and 0.47g each of O in 100mL deionized water, adjust the pH in the range of 9 to 10, stir magnetically for 30min, and add 100g of LiNi prepared by referring to the method of Comparative Example 1 after the reaction is uniform. 0.5 co 0.2 mn 0.3 o 2 The positive electrode material is then stirred at 80°C for 4h, cooled at room temperature, filtered, washed with deionized water, dried, and calcined at 800°C for 6h in an oxygen atmosphere to obtain 1wt% Bi 2 WO 6 Modified lithium ion battery LiNi 0.8 co 0.1 mn 0.1 o 2 Composite cathode material, denoted as A1.

Embodiment 2

[0083] Example 2: 1 wt% Bi 2 WO 6 Modified lithium ion battery LiNi 0.6 co 0.2 mn 0.2 o 2 Cathode material

[0084] Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 Dissolve 1.39g and 0.47g of each in 100mL deionized water, adjust the pH in the range of 9 to 10, stir magnetically for 30min, and add 100g of LiNi prepared by referring to the method of Comparative Example 2 after the reaction is uniform. 0.6 co 0.2 mn 0.2 o 2 The positive electrode material was then stirred at 80°C for 4h, cooled at room temperature, filtered, washed with deionized water, dried, and calcined at 700°C for 6h in an oxygen atmosphere to obtain 1wt% Bi 2 WO 6 Modified lithium ion battery LiNi 0.6 co 0.2 mn 0.2 o 2 Composite cathode material, denoted as A2.

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Abstract

The invention provides a high-performance lithium ion battery composite positive electrode material and a preparation method thereof, wherein the high-performance lithium ion battery composite positive electrode material comprises a high-nickel ternary positive electrode material matrix and a Bi2-aMaWO6 coating layer coating the high-nickel ternary positive electrode material matrix, and a is greater than or equal to 0 and less than 1, and M is any one or a combination of two or more of Zr, Mg, Al, Na, Fe, Ga, Mo, W, Y, Ti and Ce. According to the preparation method, the Bi2-aMaWO6 modified high-nickel ternary positive electrode material is obtained mainly through the high-temperature calcination of Bi2-aMaWO6 and the high-nickel ternary positive electrode material, the preparation methodis simple, and the prepared modified positive electrode material is regular in particle morphology, good in crystallinity and free of impurity phases; the generation and expansion of micro-cracks canbe successfully inhibited in the charging and discharging process, so that the harmful phase change from H2 to H3 is favorably reduced; and meanwhile, the specific discharge capacity, the cycle performance and the thermal stability of the positive electrode material are improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion positive electrode materials, in particular to a high-performance lithium ion battery composite positive electrode material and a preparation method thereof. Background technique [0002] With the development of high technology, power lithium-ion batteries have been rapidly applied in new energy vehicles, electronic equipment and other fields, and the development of high-stability, long-cycle, high-capacity lithium-ion battery cathode materials has become the mainstream of current research. High-nickel ternary cathode materials have higher capacity because the higher the nickel content, the easier lithium ion intercalation and deintercalation. However, due to the instability of the material structure, the material structure is easily destroyed under high temperature and high pressure and long cycle, and the capacity is fast. Attenuation, battery bulging, etc. Therefore, on the basis of high c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525C01G41/00C01G53/00
CPCC01G41/00C01G53/006C01P2004/03H01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 唐福利邓多罗桂唐泽勋商士波
Owner 湖南桑瑞新材料有限公司
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