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Preparation method of lithium nickel cobalt aluminate anode 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, and achieve improved cycle stability, reduced swelling, and decomposition Reduced effect

Inactive Publication Date: 2015-10-14
郭建
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The NCA cathode material belongs to the aluminum-doped nickel-cobalt series cathode materials. Scholars at home and abroad have carried out research for more than ten years. However, because it is a high-nickel material, it is easy to react with the electrolyte to generate a large amount of gas when it is charged. At the same time, its There are certain problems in high temperature cycle, high voltage cycle and thermal stability, which restrict the application of NCA materials in the field of lithium ion battery cathode materials

Method used

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  • Preparation method of lithium nickel cobalt aluminate anode material
  • Preparation method of lithium nickel cobalt aluminate anode material
  • Preparation method of lithium nickel cobalt aluminate anode material

Examples

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Embodiment 1

[0021] 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 4M The 10M sodium hydroxide solution of ammonia water is used as the alkali solution and the nickel-cobalt-aluminum solution to flow into the high-speed stirring reactor, adjust the flow rate of the alkali solution to control the pH value in the reactor between 10-11, and stop after the injection of the nickel-cobalt-aluminum solution is completed. 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 ...

Embodiment 2

[0024] 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 alkaline solution to control the pH value in the reactor between 11-12, stop the liquid injection after the nickel-cobalt-aluminum solution is injected, and 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-mesh sieve...

Embodiment 3

[0027] 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: 7:2:1. Sodium hydroxide solution is used as alkali solution and nickel-cobalt-aluminum solution and flow into the high-speed stirring reactor, adjust the flow rate of alkali solution to control the pH value in the reactor between 12.5-13, stop the liquid injection after the nickel-cobalt-aluminum solution is injected, and 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 12 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, put them into a roaster, and roast them at 400°C for 10 hours in an air atmosphere, then lower them to room temperature, and pass the roasted materials through a 500-mesh siev...

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Abstract

The invention relates to a preparation method of a primary large-particle lithium nickel cobalt aluminate anode material. The method is characterized by preparing a spherical nickel cobalt aluminium precursor by using a liquid phase method, then carrying out roasting by using a three-stage method, adding a certain amount of specific flux during second roasting, carrying out high-temperature roasting after uniformly mixing the materials, then washing away the flux and carrying out third roasting, thus obtaining the product after roasting, namely primary large-particle lithium nickel cobalt aluminate. The primary large-particle lithium nickel cobalt aluminate material has higher tap density and compaction density, the thermal decomposition temperature of the material is greatly increased and the cycle life of the material is greatly prolonged under the conditions of high-temperature cycle and high voltage, and ballooning is obviously weakened after the material is used for preparing soft-package batteries. The process is simple and practicable and can be used for 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] At present, lithium-ion batteries have been widely used in various mobile appliances, such as mobile phones, cameras, and notebook computers. The demand for lithium-ion secondary batteries with high performance and good safety performance continues to increase. LiNiO 2 The positive electrode material doped with Co element also has LiNiO 2 The high discharge specific capacity of the material stabilizes the layered structure of the material and enhances the cycle performance of the material. The representative material can be expressed as LiNi 0.8 co 0.2 o 2 , the positive electrode material of this composition has better energy density than the same series of materials. However, this material also has defects ...

Claims

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Application Information

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