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Carbon-coated lithium ion battery cathode slurry and preparation method thereof

A lithium-ion battery, cathode slurry technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as difficult control of material consistency, and achieve overcoming difficulty in controlling consistency, good cycle performance, and high discharge capacity. Effect

Inactive Publication Date: 2018-09-14
WUHU ZHEXIN NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the process of long-time roasting in the presence of carbon source in order to obtain carbon-coated positive electrode materials in the prior art, and overcome the partial reduction of transition metal ions due to super-time roasting that makes the material The consistency is not easy to control, the invention provides a carbon-coated lithium ion battery positive electrode slurry and its preparation method, the battery positive electrode slurry has a higher discharge capacity and good cycle performance, during the preparation process It does not need to be roasted for a long time under the condition of carbon source coating, the consistency of the material can be effectively controlled, and the preparation raw materials are easy to obtain, the preparation method is simple, and it has high promotion and application value

Method used

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preparation example Construction

[0014] The present invention provides a method for preparing a carbon-coated lithium ion battery cathode slurry. The preparation method includes the following steps: (1) The chemical formula is Ni 0.6 Co 0.2 Mn 0.2 (OH) 2 The high nickel precursor, lithium source compound, and inorganic oxidant are ground and stirred, preheated, warmed up after preheating, kept warm, and cooled after keeping warm to obtain the precursor material; (2) Add dropwise to the mixture of cyclodextrin and glacial acetic acid Hydrogen oxide is continuously mixed, and then glycerol and diphenol-based methane are added to obtain a carbon source; (3) the precursor material is added to the carbon source to ultrasonically mix, heated and dried to obtain the positive electrode active material; (4) the positive electrode active material, The conductive agent and the binder are mixed to obtain the positive electrode slurry of the lithium ion battery.

[0015] Through the above technical solutions, the present inve...

Embodiment 1

[0042] A preparation method of carbon-coated lithium ion battery cathode slurry, the preparation method includes the following steps:

[0043] (1) Change the chemical formula to Ni 0.6 Co 0.2 Mn 0.2 (OH) 2 The high-nickel precursor, lithium carbonate, and potassium dichromate were ground and stirred for 10 minutes. The ratio of the amount of Li to the inorganic oxidant in the high-nickel precursor and lithium source compound was 1:1.04:0.05 in an air atmosphere Preheat at 300°C for 6 hours. After preheating, increase the temperature at 8°C / min, keep it at 700°C for 20 hours in an oxygen atmosphere (the oxygen concentration is 85%), and cool it at 8°C / min after the heat preservation to obtain the precursor material;

[0044] (2) Add cyclodextrin, then add glacial acetic acid, add hydrogen peroxide dropwise to these mixtures, the dropping rate of hydrogen peroxide is 2mL / min, continue to mix, the mixing time is from the beginning of the dropwise addition of hydrogen peroxide to peroxi...

Embodiment 2

[0049] A preparation method of carbon-coated lithium ion battery cathode slurry, the preparation method includes the following steps:

[0050] (1) Change the chemical formula to Ni 0.6 Co 0.2 Mn 0.2 (OH) 2 The high nickel precursor, lithium carbonate, and potassium dichromate were ground and stirred for 20 minutes. The ratio of the amount of Li to the inorganic oxidant in the high nickel precursor and lithium source compound was 1:1.06:0.1, in an air atmosphere Preheat at 600°C for 3 hours, after preheating, increase the temperature at 10°C / min, keep it at 950°C for 15 hours in an oxygen atmosphere (the concentration of oxygen is 90%), and cool it at 10°C / min after the temperature to obtain the precursor material;

[0051] (2) Add cyclodextrin, then add glacial acetic acid, add hydrogen peroxide dropwise to these mixtures, the dropping rate of hydrogen peroxide is 5mL / min, keep mixing, the mixing time is from the beginning of the dropwise addition of hydrogen peroxide to peroxide 2...

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Abstract

The invention relates to a lithium ion battery, and particularly discloses carbon-coated lithium ion battery cathode slurry and a preparation method thereof. The battery cathode slurry which serves asa main composition of a lithium ion battery has high discharge capacity and good cycle performance, in a preparation process, long-time roasting under the condition of carbon source coating is not required, consistency of materials is controlled effectively, preparation raw materials are easily obtained, the preparation method is simple, and the promotion and application value is high. The process of roasting for a long time under the condition that a carbon source exists is adopted to obtain a carbon-coated cathode material in the prior art is omitted, and the shortcomings that transition metal ions are partially reduced due to overtime roasting and thus the consistency of the materials is not easy to control are overcome.

Description

Technical field [0001] The invention relates to a lithium ion battery, in particular to a carbon-coated lithium ion battery cathode slurry and a preparation method thereof. Background technique [0002] With the development of the electric vehicle industry, the demand for power lithium-ion batteries continues to increase. However, power lithium-ion batteries have higher requirements on the capacity, safety, and cycleability of battery materials. Currently, lithium iron phosphate and ordinary ternary lithium-ion battery battery materials on the market have become increasingly difficult to meet the requirements of power batteries, and there is an urgent need to develop new lithium-ion battery cathode materials. [0003] For lithium-ion batteries, the cathode material is one of the key factors to improve its performance. The positive electrode ternary material with high safety and low cost has attracted much attention, but the disadvantage of the ternary cathode material is that it c...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 高博王伟周衡郭文波
Owner WUHU ZHEXIN NEW ENERGY
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