High-nickel multi-element positive electrode material as well as preparation method and application thereof

A positive electrode material and multi-component technology, applied in the field of high-nickel multi-component positive electrode materials, can solve problems such as poor coating uniformity, lithium dissolution in material structure, battery capacity loss, etc., to avoid overwashing or uneven coating, and improve slurry stability performance, improve thermal stability

Pending Publication Date: 2022-07-08
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such methods usually achieve surface coating through heterogeneous precipitation reactions, and high-nickel materials have high pH and long feeding time in mass production, and the coating uniformity is poor in actual mass production
[0006] Another example is that the Chinese patent with the publication number CN112174221A slowly releases metal ions of the coating agent by adding a complexing agent to improve the coating uniformity of the coating, but this method requires a long coating time, which is easy to cause the material and the solvent to be used for a long time. Contact, resulting in the dissolution of lithium in the material structure, resulting in loss of battery capacity and increase in internal resistance

Method used

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  • High-nickel multi-element positive electrode material as well as preparation method and application thereof
  • High-nickel multi-element positive electrode material as well as preparation method and application thereof
  • High-nickel multi-element positive electrode material as well as preparation method and application thereof

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preparation example Construction

[0042] The present application also provides the preparation method of the high nickel multi-element cathode material, comprising the following steps:

[0043] Mixing the initial positive electrode material with the general formula (I) with water, washing with water, and separating solid and liquid to obtain a primary filter cake;

[0044] The primary filter cake is poured and filtered with an alkaline solution containing high-valent metal ions, and solid-liquid separation is performed again to obtain a secondary filter cake;

[0045] The secondary filter cake is dried and then heat-treated to obtain a high-nickel multi-element positive electrode material;

[0046] Li 1+k Me 1-k O 2 (I);

[0047] Among them, -0.03≤k≤0.10, Me=Ni c Me' d Co e R f ;

[0048] 0.80≤c≤1, 0.00≤d≤0.20, 0.05≤e≤0.20, 0≤f≤0.05, Me' is selected from one or both of Mn and Al, R is selected from Mg, Ti, B, Ba, one or more of Sr, Zr, Y and Na;

[0049] The high-valence metal ion is a cation with ...

Embodiment 1

[0056] The primary sintered cathode material powder base material is obtained by mixing nickel composite hydroxide and lithium hydroxide and firing in an oxygen atmosphere, using Li 1.025 Ni 0.90 Co 0.06 Al 0.04 O 2 It shows that the average particle size of the high nickel cathode powder is 10.6 μm, and the specific surface area is 0.28 m 2 / g; 500g primary sintered positive electrode material and deionized water were washed for 10min at a weight ratio of 1:1, and the feed liquid was subjected to suction filtration and dehydration for 30min through a Buchner suction filter bottle to obtain a primary filter cake with a moisture content of 10wt%; 3.15 g of lithium hydroxide (LiOH H 2 O) 8.69 g of tungsten oxide (WO) was added to the aqueous solution obtained by dissolving it in 150 mL of pure water 3 ) and the tungsten concentration formed is the tungsten-containing alkali solution of 0.25mol / L; the alkaline solution is evenly poured and filtered on the primary filter cake...

Embodiment 2

[0058] 6.30 g of lithium hydroxide (LiOH·H 2 O) 17.38 g of tungsten oxide (WO) was added to the aqueous solution obtained by dissolving it in 150 mL of pure water 3 ) to form a tungsten-containing alkali solution with a tungsten concentration of 0.50 mol / L. Other than that, it carried out similarly to Example 1, and obtained the multi-element high nickel material.

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Abstract

The invention provides a high-nickel multi-element positive electrode material which is composed of particles with a general formula of Li1 + kMe1-kO2 and a high-valence lithium metal oxide compound coated on the surfaces of the particles, and high-valence metal ions in the high-valence lithium metal oxide compound are positive ions which do not have electrons on the outermost d orbit and are not less than + 5 valence states. The invention further provides the high-nickel multi-element positive electrode material and application thereof. The high-nickel multi-element positive electrode material provided by the invention has high slurry stability, cycling stability and thermal safety performance, so that the electrochemical performance of the high-nickel multi-element positive electrode material serving as the positive electrode material of the lithium ion battery in various aspects is balanced.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-nickel multi-element positive electrode material, a preparation method and application thereof. Background technique [0002] With the increasing cruising range and cost requirements of new energy vehicles, high-nickel multi-element cathode materials have become an important research hotspot due to their high energy density and low cost. [0003] There are many high nickel multi-component cathode materials and LiNiO 2 Similar problems remain unsolved, such as: cation mixing, poor thermal safety, high residual alkali, strain and microcracks in secondary particles. Doping and coating strategies have been widely used to modify high-nickel multicomponent cathode materials. Bulk doping helps to stabilize the crystal structure and improve reaction kinetics, while surface coating helps to suppress side reactions and accelerate the transport of lithium ions, in whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/485H01M4/62H01M4/04H01M10/0525
CPCH01M4/366H01M4/525H01M4/505H01M4/485H01M4/628H01M4/0416H01M4/0471H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 叶射稳王碧军于建孙辉马捷杨平
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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