Ternary composite oxide matrix material, ternary positive electrode material, preparation method and lithium ion battery prepared from ternary composite oxide matrix material and ternary positive electrode material

A composite oxide and lithium-ion battery technology, which is applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve storage and safety performance problems, difficult to stabilize nickel, manganese dissolution and other problems, and achieve a solution Unstable structure, improved life and performance, and improved stability

Pending Publication Date: 2021-09-21
BEIJING CHJ AUTOMOTIVE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ternary cathode materials, especially high-nickel ternary cathode materials, generally have problems with storage and safety performance
[0004] Nickel in the ternary material can increase the energy density of the battery, cobalt can increase the rate performance of the battery, and manganese can improve the safety performance of the battery, but the latest research has found that manganese will be dissolved in the battery reaction, thereby affecting the service life of the battery. performance
At the same time, the manganese element in the nickel-cobalt-manganese body is difficult to stabilize more nickel, which leads to the current nickel-cobalt-manganese system with a slightly lower energy density and insufficient battery life.

Method used

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  • Ternary composite oxide matrix material, ternary positive electrode material, preparation method and lithium ion battery prepared from ternary composite oxide matrix material and ternary positive electrode material
  • Ternary composite oxide matrix material, ternary positive electrode material, preparation method and lithium ion battery prepared from ternary composite oxide matrix material and ternary positive electrode material
  • Ternary composite oxide matrix material, ternary positive electrode material, preparation method and lithium ion battery prepared from ternary composite oxide matrix material and ternary positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A preparation method of a ternary cathode material, comprising the steps of:

[0058] (1) Mix nickel sulfate solution, cobalt sulfate solution, boric acid solution, and aluminum sulfate solution in a Ni:Co:B:Al molar ratio of 80:10:5:5, and then add NaOH to the solution for neutralization. In the process of mixing, it is necessary to control the pH value to 11. By controlling the rotating speed (100 rpm), first wash with NaOH solution and then wash with water to remove impurities such as sulfur and sodium, and obtain the ternary hydroxide Ni 0.8 co 0.1 B 0.05 Al 0.05 (OH) 2 The precipitate was then filtered, washed, and dried at 100°C for 8 hours;

[0059] (2) In the atmosphere furnace, oxygen is introduced, and the product obtained in step (1) is heat-treated at 500 ° C for 11 hours and then naturally cooled to obtain the oxide Ni 0.8 co 0.1 B 0.05 Al 0.05 o 2 ;

[0060] (3) Mix the oxide and lithium hydroxide obtained in step (2) by the metal cation in the o...

Embodiment 2

[0067] A preparation method of a ternary cathode material, comprising the steps of:

[0068] (1) Mix nickel sulfate solution, cobalt sulfate solution, boric acid solution, and aluminum sulfate solution in a molar ratio of Ni:Co:B:Al of 80:10:5:5, then add KOH solution to the solution for neutralization, During the neutralization process, it is necessary to control the pH value to 12. By controlling the rotational speed (30 rpm), first wash with KOH solution and then wash with water to remove impurities such as sulfur and sodium, and obtain the ternary hydroxide Ni 0.8 co 0.1 B 0.05 Al 0.05 (OH) 2 The precipitate was then filtered, washed, and dried at 150°C for 4 hours;

[0069] (2) In the atmosphere furnace, air is introduced, and the product obtained in step (1) is heat-treated at 500 ° C for 11 hours and then naturally cooled to obtain the oxide Ni 0.8 co 0.1 B 0.05 Al 0.05 o 2 ;

[0070] (3) Mix the oxide and lithium hydroxide obtained in step (2) by the metal ca...

Embodiment 3

[0074] A preparation method of a ternary cathode material, comprising the steps of:

[0075] (1) Nickel sulfate solution, cobalt sulfate solution, boric acid solution, aluminum sulfate solution, by Ni:Co:B:Al molar ratio is 80:10:5:5 and mix uniformly, then add ammonia solution to neutralize in the solution, During the neutralization process, it is necessary to control the pH value to 11. By controlling the rotational speed (50 rpm), first wash with NaOH and KOH solution and then wash with water to remove impurities such as sulfur and sodium, and obtain the ternary hydroxide Ni 0.8 co 0.1 B 0.05 Al 0.05 (OH) 2 The precipitate was then filtered, washed, and dried at 120°C for 6 hours;

[0076] (2) In the atmosphere furnace, oxygen is introduced, and the product obtained in step (1) is heat-treated at 500 ° C for 11 hours and then naturally cooled to obtain the oxide Ni 0.8 co 0.1 B 0.05 Al 0.05 o 2;

[0077] (3) Mix the oxide and lithium hydroxide obtained in step (2)...

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Abstract

The invention relates to the technical field of lithium batteries, and particularly discloses a ternary composite oxide matrix material, a ternary positive electrode material, a preparation method and a lithium ion battery prepared from the ternary composite oxide matrix material and the ternary positive electrode material. The ternary positive electrode material is prepared from a ternary composite oxide matrix material, the chemical formula of the ternary composite oxide matrix material is Li1+nNi0.4+xCo0.6-x-y-zAlyBzO2, x is larger than or equal to 0.00 and smaller than 0.6, y is larger than or equal to 0.01 and smaller than 0.4, z is larger than or equal to 0.01 and smaller than 0.4, x+y+z is smaller than 0.6, and n is larger than or equal to 0.00 and smaller than 0.25. The problem that manganese is dissolved out of an existing positive electrode material is solved, and the stability of nickel and the structural stability of a nickel-cobalt-aluminum material are improved; magnetic substances in the material and residual lithium on the surface of the material are removed, so that the stability of the ternary positive electrode material is improved, and the prepared lithium ion battery has good capacity performance, cycle performance and high-temperature storage performance.

Description

technical field [0001] The disclosure relates to the technical field of lithium batteries, in particular to a ternary composite oxide matrix material, a ternary positive electrode material, a preparation method, and a lithium ion battery prepared therefrom. Background technique [0002] Lithium-ion batteries are widely used in automotive power systems due to their high energy and power density, long cycle life and other advantages. At present, the ternary positive electrode materials suitable for lithium-ion power batteries on the market mainly include lithium iron phosphate, ternary materials (lithium nickel cobalt manganate and lithium nickel cobalt aluminate), lithium titanate, etc., but due to lithium iron phosphate, manganese Lithium oxide and lithium titanate batteries have low capacity, and consumers have mileage anxiety. High-energy-density, high-nickel ternary cathode materials have become the most researched power battery ternary cathode materials. [0003] Ternar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525H01M10/42
CPCH01M4/485H01M4/505H01M4/525H01M10/0525H01M10/4235Y02E60/10
Inventor 秦一鸣
Owner BEIJING CHJ AUTOMOTIVE TECH CO LTD
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