Preparation method of ternary cathode material, ternary cathode material prepared through preparation method, lithium-ion battery and electric vehicle

A cathode material, lithium source technology, applied in the field of lithium ion batteries and electric vehicles, can solve the problems of poor particle structure integrity and stability, affecting material processing performance, battery performance, and increased side reactions between materials and electrolytes. Chemical properties, excellent cycle performance, effect of suppressing side reactions

Inactive Publication Date: 2019-02-22
QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD
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  • Abstract
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Problems solved by technology

[0004] 1. The content of free lithium on the surface of the ternary material is high, and the alkalinity is high, which will affect the processing performance of the material and the performance of the battery;
[0005] 2. The integrity and stability of the particle structure is poor. In the later stage of the secondary particles or the agglomerated single crystal, there may be pulverization of the primary particle interface or the separation of the agglomerated single crystal, the internal resistance becomes larger, the battery capacity decays rapidly, and the cycle becomes poor; During the discharge process, the crystal form of the particle structure changes, the transition metal dissolves, and the side reactions between the material and the electrolyte increase, resulting in unstable high-voltage cycle performance

Method used

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  • Preparation method of ternary cathode material, ternary cathode material prepared through preparation method, lithium-ion battery and electric vehicle

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preparation example Construction

[0051] According to the first aspect of the present invention, a method for preparing a ternary positive electrode material is provided, comprising the following steps: uniformly mixing a ternary precursor, a lithium source, and a flux, and obtaining a quasi-single crystal ternary positive electrode through one-time sintering material; then add the quasi-single crystal ternary positive electrode material into the alumina-titania sol mixed solution, heat and evaporate the solution, and obtain the aluminum-titanium-coated quasi-single crystal ternary positive electrode material through secondary sintering.

[0052] The ternary positive electrode material mentioned here is composed of three chemical components (elements), including but not limited to nickel-cobalt-manganese or nickel-cobalt-aluminum. Exemplary high-nickel NCM materials include NCM333, NCM424, NCM442, NCM523, NCM622 or NCM811 , preferably, the chemical formula of the ternary cathode material is: LiNi 1-x-y co x m...

Embodiment 1

[0121] A preparation method of a ternary positive electrode material, comprising the following steps:

[0122] (1) Set D50 to 4-5μm Ni 0.6 co 0.2 mn 0.2 (OH) 2 1kg of precursor was heated at 2°C / min to 600°C for 5 hours in an air atmosphere; all pre-calcined precursors, 0.48kg of lithium hydroxide, and 3g of boron oxide were added to a ball milling tank, and ball milled at a speed of 800r / min 4h, obtain pulverized, mixed homogeneous material;

[0123] (2) In an oxidizing atmosphere, heat the mixed material to 500°C at 2°C / min and keep it for 4 hours, then raise it to 920°C at 2°C / min and keep it for 10 hours, then cool it down to 400°C at 1°C / min , and finally cooled with the furnace; after the sintering is completed, the material is mechanically crushed and screened to obtain a ternary cathode material with a similar single crystal morphology;

[0124] (3) Add the above 500g ternary cathode material to 2kg of deionized water at a temperature of 50°C, stir for 20min and t...

Embodiment 2

[0127] A preparation method of a ternary positive electrode material, comprising the following steps:

[0128] (1) Set D50 to 4-5μm Ni 0.7 co 0.2 mn 0.1 (OH) 2 1kg of precursor was heated up to 550°C for 5 hours at 4°C / min in an air atmosphere; all pre-calcined precursors, 0.435kg of lithium hydroxide, and 2.5g of lithium fluoride were added to the ball mill tank, and the speed was 700r / min Ball milling for 4 hours to obtain pulverized and uniformly mixed materials;

[0129] (2) Heat the mixture at 4°C / min to 500°C for 4 hours in an oxidizing atmosphere, then heat at 4°C / min to 860°C for 10 hours, then cool it to 300°C at 1°C / min, and finally Cooling with the furnace; after the sintering is completed, the material is mechanically crushed to obtain a ternary cathode material with a similar single crystal morphology;

[0130] (3) Add 500g of the above-mentioned ternary cathode material to 2.5kg of an aqueous solution with a temperature of 60°C and an ethanol ratio of 5:1, s...

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Abstract

The invention discloses a preparation method of a ternary cathode material, the ternary cathode material prepared through the preparation method, a lithium-ion battery and an electric vehicle, and relates to the technical field of ternary cathode materials of lithium-ion batteries. The preparation method of the ternary cathode material comprises the following steps: a ternary precursor, a lithiumsource and a flux are evenly mixed and primarily sintered, and a mono-like-shaped ternary cathode material is obtained; and then the mono-like-shaped ternary cathode material is added into an alumina-titanium oxide sol mixed solution, the solution is heated and evaporated to be dried, and the aluminum-titanium coated mono-like-shaped ternary cathode material is obtained through secondary sintering. By adding the flux, the sintering temperature is decreased, and the mono-like-shaped material is obtained; and meanwhile, through a liquid phase coating method, the residual alkali quantity on the surface of the ternary material is decreased, the structural stability of material crystals is improved, a side reaction of the material surface is inhibited, and the electrochemical properties of thematerial are further improved.

Description

technical field [0001] The invention relates to the technical field of ternary cathode materials for lithium-ion batteries, in particular to a method for preparing a ternary cathode material and the prepared ternary cathode materials, lithium-ion batteries and electric vehicles. Background technique [0002] Among the cathode materials for lithium-ion batteries currently on the market, spinel-type lithium manganese oxide appears in the form of single crystals, and the ternary materials are mostly aggregates of spherical primary particles, that is, secondary particles formed by the agglomeration of primary particles. This kind of agglomerated particles is easy to break when rolling, and it has the disadvantages of large particle size and low compaction density. Therefore, the single crystal or quasi-single crystal ternary positive electrode material becomes a secondary spherical shape due to its high voltage and high compaction characteristics. Ternary material is a good repl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 汤依伟黄殿华吴理觉文定强付海阔郑世林
Owner QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD
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