Ternary positive electrode material and preparation method thereof, lithium ion battery and electric equipment

A cathode material, lithium source technology, applied in the field of lithium ion batteries and electrical equipment, ternary cathode materials and their preparation, can solve the problems of affecting the electrochemical performance of the material, not having electrochemical activity, affecting the specific capacity of the material, etc. Achieve excellent electrochemical activity, better coating effect, and improve cycle performance.

Active Publication Date: 2020-12-22
CNGR ADVANCED MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]With the rapid development of the new energy industry, in order to meet the growing demand for energy density in the field of power batteries, high-nickel ternary materials have the advantages of high specific capacity It has gradually become an important research direction for lithium battery cathode materials, but its poor thermal stability and high residual alkali on the surface after sintering affect its safety, cycle and processing performance
Therefore, it is necessary to modify by methods such as water washing, coating, and multiple sintering. However, water washing can reduce the residual alkali content of the material on the one hand, but on the other hand, it is easy to cause a certain degree of damage to the lithium in the material structure, thereby Affect the electrochemical performance of the material
At present, the coatings used in ternary cathode materials are generally metal oxides or metal salts or high molecular polymers. Although the cycle performance of materials can be improved to a certain extent, due to their lack of electrochemical activity, more coatings The amount of coating will significantly affect the specific capacity and other properties of the material.

Method used

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  • Ternary positive electrode material and preparation method thereof, lithium ion battery and electric equipment
  • Ternary positive electrode material and preparation method thereof, lithium ion battery and electric equipment
  • Ternary positive electrode material and preparation method thereof, lithium ion battery and electric equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062]S1: According to the molar ratio of 1:1.12, take Ni0.6Co0.2Mn0.2(OH)2Precursor and Li2CO3Mix well in the high mixer;

[0063]S2: The mixture obtained from S1 is heated to 650°C and kept for 4 hours in an air atmosphere in an atmosphere furnace, and then heated to 900°C for 14 hours at a heating rate of 3°C / min, and the base material is obtained after cooling down;

[0064]S3: Take the doped amorphous coating agent Ni with D50=300nm0.3Co0.3Mn0.3Al0.1(OH)2, It is uniformly mixed with the base material obtained in S2, wherein the mass of the doped amorphous coating agent is 5% of the mass of the base material;

[0065]S4: Heat the mixture obtained in S3 in an atmosphere furnace in an air atmosphere to 600° C. and keep it for 6 hours at a heating rate of 5° C. / min. After cooling, a high-performance double-coated ternary cathode material is obtained.

[0066]The reaction process is likefigure 1 Shown.

Embodiment 2

[0068]S1: According to the molar ratio of 1:1.12, take Ni0.8Co0.1Mn0.1(OH)2Precursor and LiOH·H2O is evenly mixed in the high mixer;

[0069]S2: Heat the mixture obtained from S1 in an atmosphere furnace in an oxygen atmosphere to 500°C and hold it for 4h, then heat it to 810°C, hold it for 14h, at a heating rate of 3°C / min, and obtain the base material after cooling down;

[0070]S3: Take the doped amorphous coating agent Ni with D50=300nm0.3Co0.3Mn0.3Al0.1(OH)2, It is uniformly mixed with the base material obtained in S2, wherein the mass of the doped amorphous coating agent is 5% of the mass of the base material;

[0071]S4: Heat the mixture obtained from S3 in an atmosphere furnace in an oxygen atmosphere to 600°C and keep it for 6 hours at a heating rate of 5°C / min. After cooling, a high-performance double-coated ternary cathode material is obtained.

[0072]The SEM image of the prepared high-performance double-coated ternary cathode material is as followsfigure 2 Shown. The SEM image of i...

Embodiment 3

[0074]S1: According to the molar ratio of 1:1.12, take Ni0.8Co0.1Mn0.1(OH)2Precursor and LiOH·H2O is evenly mixed in the high mixer;

[0075]S2: Heat the mixture obtained from S1 in an atmosphere furnace in an oxygen atmosphere to 500°C and hold it for 4h, then heat it to 810°C, hold it for 14h, at a heating rate of 3°C / min, and obtain the base material after cooling down;

[0076]S3: Take the doped amorphous coating agent Ni with D50=300nm0.3Co0.3Mn0.3Al0.1(OH)2, It is uniformly mixed with the base material obtained in S2, wherein the mass of the doped amorphous coating agent is 10% of the mass of the base material;

[0077]S4: Heat the mixture obtained in S3 in an atmosphere furnace in an oxygen atmosphere to 600° C. and keep it for 6 hours at a heating rate of 10° C. / min. After cooling, a high-performance double-coated ternary cathode material is obtained.

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Abstract

The invention provides a ternary positive electrode material, a preparation method thereof, a lithium ion battery and electric equipment. The ternary positive electrode material comprises a core layerand a shell layer coating the core layer, the core layer comprises lithium nickel cobalt manganate, and the shell layer comprises oxides of LiNixCoyMn (1-x-y) O2 and M. The preparation method of theternary positive electrode material comprises the following steps: mixing raw materials including a lithium source and a ternary precursor, and performing first sintering to obtain a substrate material; and mixing materials including a substrate material and a doped amorphous coating agent, and then carrying out second sintering to obtain the ternary positive electrode material. The lithium ion battery is prepared from raw materials including the ternary positive electrode material. The electric equipment comprises the lithium ion battery. According to the ternary positive electrode material provided by the invention, the shell layer comprises oxides of LiNixCoyMn (1-x-y) O2 and M, and the ternary positive electrode material has good electrochemical activity due to the double-coating structure, so that the ternary positive electrode material has excellent cycle performance.

Description

Technical field[0001]The invention relates to the field of lithium ion batteries, in particular to a ternary cathode material and a preparation method thereof, a lithium ion battery and electrical equipment.Background technique[0002]With the rapid development of the new energy industry, in order to meet the increasing demand for energy density in the power battery field, high nickel ternary materials have gradually become an important research direction of lithium battery cathode materials due to their high specific capacity. Defects such as poor stability and high residual alkali on the surface after sintering affect its safety, cycle and processing performance. Therefore, it needs to be modified by water washing, coating, multiple sintering, etc., but washing with water can reduce the residual alkali content of the material on the one hand, and on the other hand, it is easy to cause a certain degree of damage to the lithium in the material structure. Affect the electrochemical per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/525H01M4/505H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 罗标李魁訚硕张雨英
Owner CNGR ADVANCED MATERIAL CO LTD
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