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A kind of single crystal lithium ion battery ternary electrode material precursor, electrode material and its preparation method and application

A lithium-ion battery, ternary electrode technology, applied in battery electrodes, positive electrodes, electrical components, etc., can solve problems such as uneven force, increased production costs, and impact on material cycle performance, and achieves simple methods and energy consumption. low effect

Active Publication Date: 2021-01-22
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to obtain primary particles with a large particle size, the sintering temperature of the mixed material is generally much higher than the reaction temperature of the material, and the sintering time is also much longer than the reaction temperature of the material
During the reaction process, the volatilization of lithium salt increases. In order to ensure the lithium content in the positive electrode material, an excessive amount of lithium salt needs to be added during the mixing process, resulting in an increase in production costs.
Moreover, the stress point of crushing methods such as physical extrusion crushing and airflow impact crushing is on a certain point or a certain surface of the ternary material, and the ternary material is broken due to uneven force, which in turn affects the cycle performance of the material.
As stated in the Chinese patent with publication number CN105449169B, it is difficult to produce lithium-ion battery anode materials by pressure boiling and crystallization in large-scale industrial production, and a large amount of solvents such as water and alcohol will be used in the cleaning process, which is not conducive to environmental protection.

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  • A kind of single crystal lithium ion battery ternary electrode material precursor, electrode material and its preparation method and application
  • A kind of single crystal lithium ion battery ternary electrode material precursor, electrode material and its preparation method and application
  • A kind of single crystal lithium ion battery ternary electrode material precursor, electrode material and its preparation method and application

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preparation example Construction

[0029] The present invention also provides a preparation method of the above-mentioned ternary electrode material precursor of the single crystal lithium ion battery, comprising the following steps:

[0030] A) sintering after mixing the transition metal hydroxide and the cosolvent to obtain a sintered product;

[0031] B) under airtight, high temperature and high pressure conditions, after mixing the sintered product, air bubble material and dispersant, adding bubble filling material, so that high-pressure air bubbles enter the air bubble material, to obtain a precursor of a single crystal lithium ion battery ternary electrode material .

[0032] In the invention, the transition metal hydroxide and the cosolvent are first mixed and then sintered to obtain a sintered product.

[0033] Wherein, the transition metal hydroxide is selected from one or more of hydroxides of manganese, cobalt, and nickel elements.

[0034] The co-solvent contains one or more of boron-containing co...

Embodiment 1

[0060] 1. Put Ni 0.8 mn 0.1 co 0.1 (OH) 2 After mixing evenly with boric acid at a molar ratio of 1:0.001, sinter at 400°C for 6 hours to obtain transition metal oxides with fully grown primary particles;

[0061] see figure 1 , figure 1 for Ni 0.8 mn 0.1 co 0.1 (OH) 2 SEM image, where, Ni 0.8 mn 0.1 co 0.1 (OH) 2 The median size of the particle size is 8-15 μm, and the particle size of the primary particle is 0.01-0.05 μm.

[0062] 2. Mix the product of step 1 with polyacrylamide and water evenly according to the molar ratio of 1:0.002:0.02, heat it to 150°C in a closed container, fill it with high-pressure carbon dioxide gas, and obtain high-pressure carbon dioxide bubbles distributed inside after cooling The ternary material precursor of ;

[0063] see figure 2 , figure 2 It is an SEM image of a ternary material precursor with high-pressure carbon dioxide bubbles distributed inside, wherein the median particle size of the ternary material precursor with hi...

Embodiment 2

[0073] 1. Put Ni 0.6 mn 0.2 co 0.2 (OH) 2 After mixing evenly with sodium borate at a molar ratio of 1:0.0015, sinter at 300°C for 4 hours to obtain transition metal oxides with fully grown primary particles;

[0074] 2. Mix the product of step 1 with glucose, sucrose, and water according to the molar ratio of 1:0.005:0.002:0.001, heat it to 180°C in a closed container, fill it with high-pressure carbon dioxide gas, and obtain the surface of high-pressure carbon dioxide bubbles after cooling Coated ternary material precursor;

[0075] 3. After the ternary material precursor and lithium hydroxide are mixed evenly according to the molar ratio of 1:1, they are sintered at 810°C for 16 hours in an oxygen atmosphere to obtain large-grain single crystal LiNi 0.6 mn 0.2 co 0.2 o 2 Lithium-ion battery cathode material.

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Abstract

The invention provides a preparation method for a ternary electrode material precursor. The method comprises the following steps: A) a transition metal hydroxide and a hydrotropic agent are mixed andthen sintered to obtain the sintering product, wherein the hydrotropic agent comprises at least one of boron containing compounds, magnesium oxide and alumina; B) after a sintered product, a bubble capsule material and a dispersant are mixed, a bubble filling material is added in an air-tight, high temperature and high pressure environment, high pressure bubbles are enabled to enter the bubble capsule material, and then a single crystal lithium ion battery ternary electrode material precursor is obtained. The preparation method described in the invention is simple and controllable in technological flow, great in benefits for environment protection, and low in production cost. The single crystal lithium ion battery ternary electrode material precursor can be rapidly produced on a large scale.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a single crystal lithium ion battery ternary electrode material precursor, electrode material, preparation method and application thereof. Background technique [0002] Improving the energy density of lithium-ion batteries can solve the problem of short mileage of electric vehicles, and increasing the compaction density of lithium-ion battery ternary cathode materials can make full use of the limited battery space and increase the volumetric energy density of batteries. Studies have shown that the use of large-grain single-crystal ternary cathode materials can increase the compaction density of the pole piece and improve the cycle performance of the battery. For example, the Chinese patent with the publication number CN108199021A discloses a large-grain ternary positive electrode material for lithium-ion batteries and its preparation method. The nickel-c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/50H01M4/505H01M4/52H01M4/525H01M4/62H01M10/0525
CPCH01M4/502H01M4/505H01M4/523H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 赛喜雅勒图王雪莹顾庆文刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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