Gradient high-nickel single-crystal ternary material, preparation method thereof and battery using same

A high-nickel ternary material, ternary material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low compaction density, poor battery cycle performance and safety performance, easy to break, etc., to achieve a stable surface structure, reducing the amount of residual alkali, and improving the effect of structural strength

Active Publication Date: 2021-06-11
沁新集团(天津)新能源技术研究院有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the low compaction density of high-nickel ternary materials in the prior art, which are easily broken during the preparation of electrode sheets and charge-discharge cycles, and then The problem of poor cycle performance and safety performance of the battery is provided. A gradient high-nickel single crystal ternary materia

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  • Gradient high-nickel single-crystal ternary material, preparation method thereof and battery using same
  • Gradient high-nickel single-crystal ternary material, preparation method thereof and battery using same
  • Gradient high-nickel single-crystal ternary material, preparation method thereof and battery using same

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Example Embodiment

[0021] The present invention provides a method of preparing a gradient high nickel single crystal trimeterial material, wherein the preparation method comprises:

[0022] (1) The nano-grade high nickel-based three-membered material is used as a crystal nucleus;

[0023] (2) The crystal nucleus is carried out with the first nickel-containing cobalt manganese solution, and the second nickel-containing cobalt-containing solution is added to the solution completed in the first coprecipitation reaction, according to this method. N-coprecipitation reaction is performed; the first nickel-containing cobalt manganese solution is reduced by gradient, and the manganese content is increased.

[0024] (3) Mix the product, lithium source, and nuclear nucleus of the nthly coprecipitation reaction, and calcined under an oxygenated atmosphere;

[0025] Among them, n≥3.

[0026] According to the present invention, the nickel content refers to the nickel element in any of the first nickel-containing...

Example Embodiment

[0061] Example 1

[0062] This example is intended to illustrate the gradient high nickel single crystal ternary material of the present invention and the preparation method thereof. Its preparation process figure 1 As shown, the specific steps include:

[0063] (1) Put the commercially available high nickel 811 three-membered material into the ball mill, the spherical ratio is 1: 15, the rotation speed is 1500 rpm, the ball milling for 3 h, resulting in a high nickel-three-membered material particles having an average particle diameter of 150 nm, as crystal Renuine;

[0064] (2) The total molar amount of metal elements is based on element, and the molar ratio of nickel, cobalt and manganese is 9: 0.5: 0.5, respectively, the sulfate, sulfate and manganese sulfate is formulated in deionized water. The total metal element of nickel-wateng manganese concentration is 2 mol / L, a first nickel-containing cobalt manganese solution, add 2 mol / L ammonia water in the first nickel-contain...

Example Embodiment

[0074] Example 2

[0075] This example is intended to illustrate the gradient high nickel single crystal ternary material of the present invention and the preparation method thereof.

[0076] (1) Put the commercially available high nickel 811 three-membered material into the ball mill, the spheroid is 1:20, the rotational speed is 2000 rpm, the ball milling 2h, obtains a high nickel-three-membered material particles having an average particle diameter of 100 nm, as crystal Renuine;

[0077] (2) The total molar amount of the metal element is based on the element, according to the molar ratio of nickel, cobalt and manganese is 9: 0.5: 0.5, respectively, the acetate, cobalt acetate and manganese acetate is formulated in deionized water. The total metal element of nickel-wateng manganese concentration is 1 mol / L, a first nickel-containing cobalt manganese solution, add 2 mol / L ammonia water in the first nickel-containing cobalt manganese solution, so that NH 3 · H2 O Total molar r...

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Abstract

The invention relates to a lithium ion battery positive electrode material, and particularly provides a preparation method of a gradient high-nickel single-crystal ternary material. The preparation method comprises the following steps of: (1) taking nanoscale high-nickel ternary material particles as crystal nucleuses; (2) carrying out a first coprecipitation reaction on the crystal nucleuses and a first nickel-cobalt-manganese-containing solution, adding a second nickel-cobalt-manganese-containing solution into the solution after the first coprecipitation reaction is completed, carrying out a second coprecipitation reaction, and carrying out coprecipitation reactions for n times according to the method, wherein the nickel content in the first nickel-cobalt-manganese-containing solution to the nth nickel-cobalt-manganese-containing solution is reduced in a gradient manner, and the manganese content is increased in a gradient manner; and (3) mixing the product of the nth coprecipitation reaction, a lithium source and the crystal nucleuses, and calcining the mixture in an oxygen-containing atmosphere. The gradient high-nickel single-crystal ternary material prepared by adopting the method has an obvious single-crystal form, the structural strength of ternary material particles is effectively improved, the residual alkali amount on the surface of the material is reduced, and the discharge capacity and the cycle performance of a battery can be effectively improved when the gradient high-nickel single-crystal ternary material is applied to the battery.

Description

technical field [0001] The invention relates to a positive electrode active material of a lithium ion battery, in particular to a gradient high-nickel single crystal ternary material, a preparation method thereof and a battery using the material. Background technique [0002] With the rapid development of new energy vehicles in recent years, high energy density, long cycle life, high safety performance, and low cost have become the core issues of concern for battery and material related companies. Ternary materials have become the target of many companies because of their advantages such as high specific capacity, good capacity retention rate, and high-voltage charging performance. Among them, high-nickel ternary materials are more popular because they greatly increase the energy density of materials. became the focus of everyone's attention. [0003] At present, the high-nickel ternary materials on the market are mostly composed of secondary particles, which exist in the f...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505H01M10/0525
CPCH01M4/525H01M4/505H01M10/0525H01M2004/028Y02E60/10
Inventor 王宏栋王芳
Owner 沁新集团(天津)新能源技术研究院有限公司
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