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Carbon-coated high-nickel lithium ion battery positive electrode paste and preparation method thereof

A lithium-ion battery, cathode slurry technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of difficult control of material consistency, and achieve the effects of high promotion and application value, control consistency, and good cycle performance

Inactive Publication Date: 2018-10-12
WUHU ZHEXIN NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 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 high-nickel lithium-ion battery positive electrode slurry and its preparation method, the battery positive electrode slurry has a higher discharge capacity and good cycle performance, in the preparation The process does not require long-term roasting under the condition of carbon source coating, effectively controlling the consistency of the material, and the preparation raw materials are easy to obtain, the preparation method is simple, and has high promotion and application value

Method used

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preparation example Construction

[0015] The invention provides a method for preparing a carbon-coated high-nickel lithium-ion battery cathode slurry, the preparation method comprising the following steps: (1) changing the chemical formula to Ni 0.8 co 0.1 mn 0.1 (OH) 2 Grinding and stirring the high-nickel precursor, lithium source compound and inorganic oxidizing agent, preheating, heating after preheating, heat preservation, cooling after heat preservation, to obtain the precursor material; Concentrated sulfuric acid is added dropwise to the mixture and continuously mixed to obtain a carbon source; (3) the precursor material is added to the carbon source for ultrasonic mixing, heated and dried to obtain a positive electrode active material; (4) the positive electrode active material, the conductive agent and the binder Agents are mixed to obtain high-nickel lithium-ion battery positive electrode slurry.

[0016] Through the above technical scheme, the present invention provides a carbon-coated high-nicke...

Embodiment 1

[0044] A method for preparing a carbon-coated high-nickel lithium-ion battery cathode slurry, the preparation method comprising the following steps:

[0045] (1) Change the chemical formula to Ni 0.8 co 0.1 mn 0.1 (OH) 2 The high-nickel precursor, lithium carbonate, and potassium dichromate were ground and stirred for 10 minutes, wherein 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 the air atmosphere Preheat at 300°C for 6 hours, heat up at 8°C / min after preheating, hold at 700°C for 20 hours in an oxygen atmosphere (oxygen concentration is 85%), and cool at 8°C / min after holding to obtain the precursor material;

[0046] (2) Grinding graphite, glycerin and diphenolyl methane in a ball mill for 20 hours at a speed of 900r / min, adding glacial acetic acid, adding concentrated sulfuric acid dropwise to these mixtures, the dropping speed of the concentrated sulfuric acid is 0.6mL / min, conti...

Embodiment 2

[0051] A method for preparing a carbon-coated high-nickel lithium-ion battery cathode slurry, the preparation method comprising the following steps:

[0052] (1) Change the chemical formula to Ni 0.8 co 0.1 mn 0.1 (OH) 2 The high-nickel precursor, lithium carbonate, and potassium dichromate were ground and stirred for 20 minutes, wherein the ratio of the amount of Li to the inorganic oxidant in the high-nickel precursor and the lithium source compound was 1:1.06:0.1, in an air atmosphere Preheat at 600°C for 3 hours, heat up at 10°C / min after preheating, heat at 950°C for 15 hours in an oxygen atmosphere (oxygen concentration is 90%), cool at 10°C / min after heat preservation, and obtain the precursor material;

[0053] (2) Grind graphite, glycerin and diphenoly methane in a ball mill for 10 hours at a speed of 1000r / min, add glacial acetic acid, add concentrated sulfuric acid dropwise to these mixtures, and the dropping speed of the concentrated sulfuric acid is 1mL / min , ...

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Abstract

The invention relates to a lithium ion battery, and specifically discloses carbon-coated high-nickel lithium ion battery positive electrode paste and a preparation method thereof. The battery positiveelectrode paste is used as the main component of the lithium ion battery, and has relatively high discharge capacity and high cycle performance; in the preparation process, long-time roasting in a carbon source coating condition is not needed, so that material consistency can be controlled effectively; in addition, the preparation raw materials are easily available, the preparation method is simple, and a relatively high popularization and application value is achieved; by adoption of the preparation method, the shortcoming of a process of long-time roasting in a carbon source existence condition for obtaining the carbon-coated positive electrode material adopted in the prior art is overcome; and in addition, the shortcoming of difficulty in controlling material consistency caused by partial reduction of transition metal ions due to super-long-time roasting also can be overcome.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a carbon-coated high-nickel 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. At present, lithium iron phosphate and ordinary ternary lithium-ion battery materials on the market have become increasingly difficult to meet the requirements of power batteries, and it is urgent to develop new lithium-ion battery cathode materials. [0003] High-nickel lithium-ion battery materials have attracted widespread attention due to their high capacity and reasonable price, and are also known as one of the most important cathode materials for next-generation power lithium-ion batteries. However, high-nickel lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/583H01M4/62H01M4/36H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/583H01M4/62H01M10/0525Y02E60/10
Inventor 高博王伟周衡郭文波
Owner WUHU ZHEXIN NEW ENERGY
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