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A kind of preparation method of lithium nickel cobalt aluminate and precursor thereof

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, reduce surface alkalinity, The effect of small particle size difference

Inactive Publication Date: 2019-07-16
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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  • A kind of preparation method of lithium nickel cobalt aluminate and precursor thereof
  • A kind of preparation method of lithium nickel cobalt aluminate and precursor thereof
  • A kind of preparation method of lithium nickel cobalt aluminate and precursor thereof

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Embodiment 1

[0021] Example 1: Dissolve nickel salt, cobalt salt, and aluminum salt in deionized water and mix uniformly to obtain a 2M nickel-cobalt-aluminum salt solution. The molar ratio of nickel-cobalt-aluminum ion is 8:1.5:0.5, which will contain 4M Ammonia water 10M sodium hydroxide solution is used as the alkali solution and the nickel, cobalt and aluminum solution to be co-flowed 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 nickel, cobalt and aluminum solution is injected. Liquid injection, the obtained slurry is subjected to solid-liquid separation, and the obtained solid material is washed and dried in an oven at 120 degrees for 8 hours to obtain a nickel, cobalt, and aluminum precursor. The nickel-cobalt-aluminum precursor and the lithium source are uniformly mixed at a molar ratio of 1:1.05, and then put into a roasting furnace, roasted at 300 degrees in an air atmospher...

Embodiment 2

[0024] The nickel salt, cobalt salt, and aluminum salt are dissolved in deionized water and mixed uniformly to obtain a 2M nickel-cobalt-aluminum salt solution. The molar ratio of nickel-cobalt-aluminum ion is 8:1:1. The 6M solution containing 6M ammonia The sodium hydroxide solution is used as an alkali solution and the nickel, cobalt and aluminum solution to be co-flowed into the high-speed stirring reaction kettle. The flow rate of the alkali solution is adjusted to control the pH value in the reaction kettle between 11-12. The injection is stopped after the nickel, cobalt and aluminum solution is injected. 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. The nickel-cobalt-aluminum precursor and the lithium source are evenly mixed at a molar ratio of 1:1.1, and then put into a roasting furnace, roasted at 500 degrees in an air atm...

Embodiment 3

[0027] The nickel salt, cobalt salt, and aluminum salt are dissolved in deionized water and mixed uniformly to obtain a 2M nickel-cobalt-aluminum salt solution. The molar ratio of nickel-cobalt-aluminum ion is 7:2:1. The 4M solution containing 4M ammonia The sodium hydroxide solution is used as the alkali solution and the nickel, cobalt and aluminum solution to be co-flowed into the high-speed stirring reaction kettle. The flow rate of the alkali solution is adjusted to control the pH value in the reaction kettle between 12.5 and 13 until the nickel, cobalt and aluminum solution is injected. 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. The nickel-cobalt-aluminum precursor and the lithium source are mixed uniformly at a molar ratio of 1:1, and then put into a roasting furnace, roasted at 400 degrees in an air atmosphere for 10 ho...

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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 lithium ion battery cathode materials, and in particular relates to a high specific capacity lithium ion battery cathode material and a preparation method thereof. Background technique [0002] At present, lithium-ion batteries have been widely used in various mobile electrical appliances, such as mobile phones, cameras, notebook computers, etc. As the power consumption of portable devices continues to increase, various battery supporting manufacturers are relatively small in size, light in weight, and relatively large in capacity. The demand for lithium ion secondary batteries with high and better safety performance continues to increase. LiNiO 2 The cathode material doped with Co element also has LiNiO 2 The higher discharge specific capacity of the material stabilizes the layered structure of the material and at the same time enhances the cycle performance of the material. The representative material can be...

Claims

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Application Information

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