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Modified low residual alkali type high nickel ternary cathode material and preparation method and application thereof

A positive electrode material, high nickel technology, applied in the field of lithium ion batteries, can solve the problems affecting the electrochemical performance of materials, lithium damage, etc., and achieve the effect of reducing the amount of residual alkali and pH value, and removing residual alkali

Inactive Publication Date: 2019-05-17
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are still few studies on how to solve the residual lithium on the surface of high-nickel materials.
Some studies have proposed to use water washing and secondary sintering to remove residual lithium, but water washing will cause a certain degree of damage to the lithium in the ternary material structure and affect the electrochemical performance of the material.

Method used

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  • Modified low residual alkali type high nickel ternary cathode material and preparation method and application thereof
  • Modified low residual alkali type high nickel ternary cathode material and preparation method and application thereof

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Embodiment 1

[0040] This embodiment provides a method for preparing a modified low residual alkali type high-nickel ternary positive electrode material, wherein the preparation method includes the following steps:

[0041] S1. Preparation of spherical ternary precursor Ni by co-precipitation method 0.8 co 0.1 mn 0.1 (OH) 2 :

[0042] Take battery grade NiSO at a molar ratio of 8:1:1 4 、CoSO 4 and MnSO4 After mixing, add high-purity water to obtain 4L of a 1.0mol / L solution, then add 32g of ascorbic acid to obtain a mixed solution; use a peristaltic pump parallel flow method to place the mixed solution, 1mol / L ammonia solution, and 2mol / L NaOH solution Mix and stir in the reaction kettle to react, control the pH value to 11.45, the reaction temperature is 50°C, and the stirring speed is 400r / min. The precipitate generated by the reaction is filtered by the fan for 5 times, and then dried with a blower dryer for 8 hours. Obtain nickel cobalt manganese hydroxide, that is, ternary precur...

Embodiment 2

[0049] This embodiment provides a method for preparing a modified low residual alkali type high-nickel ternary positive electrode material, wherein the preparation method includes the following steps:

[0050] S1. Preparation of spherical ternary precursor Ni by co-precipitation method 0.8 co 0.1 mn 0.1 (OH) 2 :

[0051] Take battery grade NiSO at a molar ratio of 8:1:1 4 、CoSO 4 and MnSO 4 After mixing, add high-purity water to obtain 4L of 1.0mol / L solution, add 32g of ascorbic acid to obtain a mixed solution; use a peristaltic pump parallel flow method, place the mixed solution, 1mol / L ammonia solution, and 2mol / L NaOH solution in Mix and stir in the reaction kettle to react, control the pH value to 11.45, the reaction temperature is 50°C, and the stirring speed is 400r / min. The precipitate generated by the reaction is filtered by the fan for 5 times, and then dried for 8 hours with a blower dryer to obtain Nickel-cobalt-manganese hydroxide, the ternary precursor;

...

Embodiment 3

[0057] This embodiment provides a method for preparing a modified low residual alkali type high-nickel ternary positive electrode material, wherein the preparation method includes the following steps:

[0058] S1. Preparation of spherical ternary precursor Ni by co-precipitation method 0.8 co 0.1 mn 0.1 (OH) 2 :

[0059] Take battery grade NiSO at a molar ratio of 8:1:1 4 、CoSO 4 and MnSO 4 After mixing, add high-purity water to obtain 4L of 1.0mol / L solution, add 32g of ascorbic acid to obtain a mixed solution; use a peristaltic pump parallel flow method, place the mixed solution, 1mol / L ammonia solution, and 2mol / L NaOH solution in Mix and stir in the reaction kettle to react, control the pH value to 11.45, the reaction temperature is 50°C, and the stirring speed is 400r / min. The precipitate generated by the reaction is filtered by the fan for 5 times, and then dried for 8 hours with a blower dryer to obtain Nickel-cobalt-manganese hydroxide, the ternary precursor;

...

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Abstract

The invention provides a modified low residual alkali type high nickel ternary cathode material and a preparation method and application thereof. According to the preparation method, a high nickel ternary cathode material and hydrogen phosphate are dispersed in a solvent uniformly, then an obtained mixed solution is stoved, then a stoved product is sintered, so as to enable residual alkali on thesurface of the high nickel ternary cathode material and hydrogen phosphate to react to generate phosphate. The process shows how the modified low residual alkali type high nickel ternary cathode material is produced. Remarkable reduction of residual alkali and pH of the modified low residual alkali type high nickel ternary cathode material help prevent residual alkali from directly contacting withelectrolyte to produce side effects, and cause high ionic conductivity between reaction interfaces of the modified low residual alkali type high nickel ternary cathode material and the electrolyte, thereby reducing impedance; further, the rate performance of the material is improved remarkably; and high temperature cycle performance of the material is improved remarkably.

Description

technical field [0001] The invention relates to a modified low-residual alkali-type high-nickel ternary positive electrode material and a preparation method and application thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] With the increasing demand for energy density of lithium-ion batteries, high-nickel ternary materials (nickel content ≥ 60%) have gradually become the development trend of ternary materials due to their higher energy density. In the ternary material system, with the increase of nickel content, the average valence state of nickel gradually increases from +2 to +3. However, Ni 3+ Ions are not very stable in air and are easily reduced to Ni spontaneously 2+ , at the same time, along with the precipitation of lithium, LiOH and Li 2 CO 3 and other alkaline substances. In addition, in order to compensate for the volatilization of lithium at high temperature, an excessive amount of lithium source is usually add...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525H01M10/42
CPCY02E60/10
Inventor 史俊李道聪夏昕杨茂萍丁楚雄何磊
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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