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A kind of preparation method of high-density power type nickel cobalt lithium manganese oxide cathode material

A technology of nickel cobalt lithium manganate and cathode material, which is applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of nickel element oxidation, low tap density of ternary materials, and obvious limitations.

Active Publication Date: 2020-10-23
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional solid-state method has simple equipment and is easy to operate, but the tap density of the ternary material produced is small, and it is difficult to completely oxidize the nickel element for the sintering of the high-nickel ternary material, which has obvious limitations.

Method used

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  • A kind of preparation method of high-density power type nickel cobalt lithium manganese oxide cathode material
  • A kind of preparation method of high-density power type nickel cobalt lithium manganese oxide cathode material
  • A kind of preparation method of high-density power type nickel cobalt lithium manganese oxide cathode material

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preparation example Construction

[0029] A method for preparing a high-density power type nickel-cobalt lithium manganese oxide positive electrode material, comprising the following steps:

[0030] 1) Mix nickel-cobalt-manganese hydroxide and lithium source, add research aid, ball mill, then add dispersant, stir to obtain particle agglomerates;

[0031] 2) putting the granular aggregates into the mold and compacting to obtain a blank;

[0032] 3) heating the billet under an air atmosphere, and then introducing oxygen for hot isostatic pressing sintering to obtain a crude product of nickel-cobalt lithium manganese oxide;

[0033] 4) Crushing the crude nickel-cobalt-lithium-manganese-oxide product to obtain the nickel-cobalt-lithium-manganese-oxide cathode material.

[0034] Preferably, in step 1), the molar ratio of nickel-cobalt-manganese in the nickel-cobalt-manganese hydroxide to the lithium element in the lithium source is 1: (1.0-1.2), that is (Ni+Co+Mn): Li=1: (1.0~1.2).

[0035] Preferably, in step 1)...

Embodiment 1

[0048] A kind of preparation method of power type lithium cobalt manganese oxide comprises the following concrete steps:

[0049] (1) Mix nickel-cobalt-manganese hydroxide (the ratio of nickel, cobalt, and manganese elements is 55:15:30) and lithium carbonate according to the elemental molar ratio (Ni+Co+Mn): Li is 1:1.0, and press solid-liquid Add water at a ratio of 1:0.5 (that is, add 0.5 L per 1 kg of nickel-cobalt-manganese hydroxide and lithium carbonate), and ball mill for 1 hour. Add 1 mg / L polyethylene glycol aqueous solution at a solid-liquid ratio of 1:0.2 (that is, add 0.2 L per 1 kg of nickel-cobalt-manganese hydroxide and lithium carbonate), and stir at 50 ° C until the solution is nearly dry to obtain particle agglomerates .

[0050] (2) Put the agglomerate above into a mold, apply 100 MPa for compaction, and obtain a billet.

[0051] (3) The billet is heated from room temperature to 100°C at 3°C / min under the atmosphere of external circulating air, and kept a...

Embodiment 2

[0055] A kind of preparation method of power type lithium cobalt manganese oxide comprises the following concrete steps:

[0056](1) Mix nickel-cobalt-manganese hydroxide (the ratio of nickel, cobalt, and manganese elements is 55:13:32) and lithium hydroxide according to the elemental molar ratio (Ni+Co+Mn): Li is 1:1.1, and press solid Add acetone at a liquid ratio of 1:0.3 (that is, add 0.3 L per 1 kg of nickel-cobalt-manganese hydroxide and lithium hydroxide), and ball mill for 5 hours. According to the solid-liquid ratio of 1:0.1 (that is, adding 0.1L per 1kg of nickel-cobalt-manganese hydroxide and lithium hydroxide), add 50mg / L polyethylene glycol aqueous solution, stir at 65°C until the solution is nearly dry, and obtain particle agglomeration things.

[0057] (2) Put the agglomerate above into a mold, apply 50 MPa for compaction, and obtain a billet.

[0058] (3) The billet is heated from room temperature to 100°C at 1°C / min under the atmosphere of external circulati...

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Abstract

The invention discloses a preparation method of a high-density dynamical type lithium nickel cobalt manganate positive electrode material. The preparation method of the high-density dynamical type lithium nickel cobalt manganate positive electrode material comprises the following steps of 1) mixing nickel cobalt manganese hydroxide with a lithium source, adding a research assistant agent, ball-milling, then adding a dispersing agent and stirring to obtain a granular aggregation material; 2) placing the granular aggregation material into a mould and compacting to obtain a blank; 3) heating theblank in an air atmosphere and then inflating oxygen for hot isostatic pressing sintering so as to obtain a lithium nickel cobalt manganate coarse product; and 4) crushing the lithium nickel cobalt manganate coarse product to obtain the lithium nickel cobalt manganate positive electrode material. The prepared lithium nickel cobalt manganate positive electrode material has very high compaction density and is good for improving the electric performance of a high-nickel material.

Description

technical field [0001] The invention relates to a preparation method of a high-density dynamic nickel-cobalt lithium manganese oxide positive electrode material. Background technique [0002] According to the data released by the Ministry of Industry and Information Technology, in 2017, the production and sales of new energy vehicles reached 794,000 and 777,000, respectively, a year-on-year increase of 53.8% and 53.3%. In 2017, the new energy vehicle market accounted for 2.7%, a year-on-year increase of 0.9%. Under the background of policy encouragement and people's increasing emphasis on environmental protection, the new energy automobile industry has developed rapidly. Lithium-ion batteries are widely used in new energy vehicles as power batteries because of their advantages such as good safety, high discharge specific energy, long charge and discharge life, and no pollution. [0003] The performance of the cathode material directly determines the performance of the lith...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李长东阮丁山蔡勇谢英豪欧彦楠余海军
Owner GUANGDONG BRUNP RECYCLING TECH