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Preparation method for nickel cobalt lithium aluminate small-particle single-crystal material

A technology of nickel-cobalt-lithium aluminate and nickel-cobalt-aluminum, which is applied in the field of positive electrode materials for high specific capacity lithium-ion batteries and its preparation, can solve problems restricting the application of NCA materials, achieve improved cycle stability, uniform particles, and reduce surface alkaline effect

Inactive Publication Date: 2016-02-10
郭建
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The NCA cathode material, namely nickel oxide cobalt lithium aluminate material, belongs to the aluminum-doped nickel-cobalt series cathode material. Scholars at home and abroad have carried out research for more than ten years, but because it is a high-nickel material, it is easy to mix with electrolytic The liquid reacts to produce a large amount of gas, and there are certain problems in its high-temperature cycle, high-voltage cycle, and thermal stability, which restricts the application of NCA materials in the field of lithium-ion battery cathode materials.

Method used

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  • Preparation method for nickel cobalt lithium aluminate small-particle single-crystal material
  • Preparation method for nickel cobalt lithium aluminate small-particle single-crystal material
  • Preparation method for nickel cobalt lithium aluminate small-particle single-crystal material

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Embodiment 1

[0019] Example 1: Dissolve nickel salt, cobalt salt, and aluminum salt in deionized water and mix evenly to obtain a 2M nickel-cobalt-aluminum salt solution, wherein the molar ratio of nickel-cobalt-aluminum ions is: 8:1.5:0.5, and will contain 8M The 12M sodium hydroxide solution of ammonia water is used as the alkaline solution and the nickel-cobalt-aluminum solution and flowed into the high-speed stirring reactor. Injecting liquid, separating the obtained slurry into solid and liquid, washing the obtained solid material and drying in an oven at 120°C for 8 hours to obtain a nickel-cobalt-aluminum precursor. Mix the nickel-cobalt-aluminum precursor and the lithium source at a molar ratio of 1:1.05, put them into a roaster, roast them at 300°C for 8 hours in an air atmosphere, and then lower them to room temperature. Pass the roasted materials through a 500-mesh sieve. The sieved material, polyethylene glycol accounting for 8% of the mass of the material and 300ml of pure wat...

Embodiment 2

[0022] Dissolve nickel salt, cobalt salt, and aluminum salt in deionized water and mix evenly to obtain a 2M nickel-cobalt-aluminum salt solution, wherein the molar ratio of nickel-cobalt-aluminum ions is: 8:1:1. Sodium hydroxide solution is used as alkaline solution and nickel-cobalt-aluminum solution and flow into the high-speed stirring reactor, adjust the flow rate of the alkaline solution to control the pH value in the reactor between 11.5-12.5, stop the injection after the injection of the nickel-cobalt-aluminum solution, and put The obtained slurry is subjected to solid-liquid separation, and the obtained solid material is washed and dried in an oven at 150 degrees for 8 hours to obtain a nickel-cobalt-aluminum precursor. Mix the nickel-cobalt-aluminum precursor and the lithium source in a molar ratio of 1:1.1, put them into a roaster, roast them at 500°C for 20 hours in an air atmosphere, then lower them to room temperature, and pass the roasted materials through a 500-...

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Abstract

The invention relates to a preparation method for a small-particle single-crystal nickel cobalt lithium aluminate positive electrode material. A spherical nickel cobalt aluminum precursor is prepared by using a liquid phase method, and the precursor is pre-baked with a lithium salt; a certain amount of a dispersing agent is added to be grinded before a baking process for the second time, and then the product is uniformly mixed with a certain amount of a special fluxing agent to be subjected to a high temperature baking; next, the fluxing agent is washed off, and the third time of baking is performed; and the product obtained after baking is the small-particle single-crystal nickel cobalt lithium aluminate. The small-particle single-crystal nickel cobalt lithium aluminate material has the characteristics of high capacity and high compaction density; the thermal decomposition temperature and the cycle life of the material at high temperature and high voltage are greatly improved; the flexibly-packaged cells prepared from the small-particle single-crystal nickel cobalt lithium aluminate positive electrode material basically have no bulging phenomenon; and in addition, the preparation method is simple in technology and can be used in large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium ion batteries, in particular to a cathode material for high specific capacity lithium ion batteries and a preparation method thereof. Background technique [0002] The NCA positive electrode material, namely nickel oxide cobalt lithium aluminate material, belongs to the aluminum-doped nickel-cobalt series positive electrode material. Scholars at home and abroad have carried out research for more than ten years, but because it is a high-nickel material, it is easy to mix with electrolytic The liquid reacts to produce a large amount of gas. At the same time, there are certain problems in its high-temperature cycle, high-voltage cycle, and thermal stability, which restricts the application of NCA materials in the field of lithium-ion battery cathode materials. Contents of the invention [0003] The method proposed by the present invention is to prepare the NCA material into sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/525
CPCY02E60/10
Inventor 郭建
Owner 郭建
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