Lithium ion power battery composite positive electrode material and preparation method thereof

A composite cathode material, power battery technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems affecting the structural stability, electrical conductivity and side reactions of high-voltage lithium manganate cathode materials, and achieve the realization of The effect of large-scale commercial application, improved uniformity, and ease of large-scale commercial application

Inactive Publication Date: 2020-03-31
HENAN INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this material is a 5.0V positive electrode material, the working voltage is about 4.7V. During use, the conventional electrolyte often produces serious side reactions under high voltage operation, which seriously affects the high voltage lithium nickel manganese oxide positive electrode material. Structural stability and electrical conductivity

Method used

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  • Lithium ion power battery composite positive electrode material and preparation method thereof
  • Lithium ion power battery composite positive electrode material and preparation method thereof
  • Lithium ion power battery composite positive electrode material and preparation method thereof

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preparation example Construction

[0023] The present invention also provides a method for preparing a lithium-ion power battery composite positive electrode material described in the above technical solution, comprising the following steps:

[0024] providing a mixed solution including citric acid, lithium source, nickel source, manganese source and dopant source, adjusting the pH value, and then heating to obtain a sol-gel;

[0025] Drying and sintering the sol-gel in sequence to obtain doped modified lithium nickel manganese oxide;

[0026] The doped modified lithium nickel manganese oxide is pulverized, mixed with carbon black nanoparticles and carbon nanotubes, and dried to obtain the lithium ion power battery composite cathode material.

[0027] The invention provides a mixed solution including citric acid, lithium source, nickel source, manganese source and doping source, which is heated after adjusting the pH value to obtain sol-gel.

[0028] In the present invention, unless otherwise specified, the ra...

Embodiment 1

[0040] Weigh nickel acetate (8.9584g), manganese acetate (28.4304g) and aluminum nitrate (3.0012g) to prepare mixed solution A; weigh citric acid (17.6516g) and lithium hydroxide (3.5248g) to prepare mixed solution B. Solution B was slowly added dropwise to solution A to obtain mixed solution C, and the pH value was adjusted to 7.5 by adding ammonia water dropwise, and then the temperature was raised to 80°C for heating in a water bath while the magnetic stirrer continued to stir until a gel was formed. Then, the wet gel was dried at 110° C. for 24 hours to obtain a dry gel and pre-sintered at a temperature of 450° C. for 4 hours and a heating rate of 5° C. / min. Then, the calcined product is sintered to obtain the aluminum-modified lithium nickel manganate cathode material LiNi 0.45 mn 1.45 Al 0.1 o 4 , the sintering temperature is 800°C, the sintering time is 12h, and the heating rate is 5°C / min.

[0041] The LiNi prepared above was processed by ball milling 0.45 mn 1.4...

Embodiment 2

[0045] Weigh nickel acetate (8.9584g), manganese acetate (28.4304g), magnesium nitrate (1.0256g) and nano-titanium dioxide (0.3196g) to prepare mixed solution A; weigh citric acid (17.6516g) and lithium hydroxide (3.5248g ), prepare mixed solution B. Slowly add solution B to solution A dropwise to obtain mixed solution C, and adjust the pH value of mixed solution C to 7.5 by adding ammonia water dropwise, then raise the temperature to 80°C for heating in a water bath, while stirring continuously with a magnetic stirrer until a gel is formed. Then, the wet gel was dried at 105° C. for 30 hours to obtain a dry gel and pre-sintered at a temperature of 400° C. for 6 hours and a heating rate of 5° C. / min. Then, the calcined product is sintered to obtain the aluminum-modified lithium nickel manganate cathode material LiNi 0.45 Mg 0.05 mn 1.45 Ti 0.05 o 4 , the sintering temperature is 800°C, the sintering time is 12h, and the heating rate is 5°C / min.

[0046] The LiNi prepared...

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Abstract

The invention provides a lithium ion power battery composite positive electrode material and a preparation method thereof, and belongs to the technical field of lithium ion power battery positive electrode materials. The invention provides a lithium ion power battery composite positive electrode material. The lithium ion power battery composite positive electrode material comprises doped modifiedlithium nickel manganese oxide with the chemical composition of LiNi < 0.5-x > Mn < 1.5-y > M < x > N < y > O < 4 >, carbon black nanoparticles and carbon nanotubes, 0 < = x < = 0.1, 0 < = y < = 0.1,and x + y < = 0.1. The doped modified lithium nickel manganese oxide is co-modified by adopting the carbon black nanoparticles and the carbon nanotubes, so that the structural stability of the composite positive electrode material is effectively enhanced, the electrochemical performance is improved, Meanwhile, the influence of an electrolyte on the structure and the electrochemical performance ofthe composite positive electrode material in a charging and discharging process is inhibited.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium-ion power batteries, and in particular relates to a composite cathode material for lithium-ion power batteries and a preparation method thereof. Background technique [0002] In the lithium-ion power battery system, the use of cathode materials largely affects the performance and manufacturing cost of the battery system. Among the cathode materials for lithium-ion power batteries that are becoming more and more mature in the current market, the high-voltage lithium nickel manganese oxide cathode material has the characteristics of high energy density, abundant raw material sources, good thermal stability, and less environmental pollution. favored. However, this material also has many problems that need to be solved. Since the material is a 5.0V positive electrode material, the working voltage is about 4.7V. During use, the conventional electrolyte often produces serious sid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/505H01M4/525H01M4/625H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 赵红远董丽付成果冯宜鹏张明明张亚奇吴婷婷尹清帅申东辉周宇赵孟元申彦胜李勇峰苏建修
Owner HENAN INST OF SCI & TECH
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