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Positive lithium supplement additive, positive pole piece, preparation method of positive pole piece and lithium ion battery

A positive electrode piece and additive technology, applied in the field of positive electrode lithium supplementary additive, positive electrode piece, and its preparation field, can solve the problems such as the lithium source cannot be completely consumed, the sintering temperature is low, and the processing of the electrode piece is affected, and the electrochemical performance is improved. , The slurry distribution is uniform, and the effect of improving the manufacturing quality

Pending Publication Date: 2022-02-22
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation process of lithium-rich lithium nickelate, excessive lithium oxide is often added, and the sintering temperature is low (2 CO 3 , LiOH), and these residual alkalis will react with the positive electrode binder polyvinylidene fluoride (PVDF), which is prone to chemical gelation during the stirring process of the slurry, which increases the viscosity of the slurry and affects the processing of the electrode sheet
In addition, these residual alkalis may react with the electrolyte at high temperatures to generate gaseous substances such as carbon dioxide, resulting in increased battery gas production or increased battery impedance, eventually causing a decline in battery performance

Method used

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  • Positive lithium supplement additive, positive pole piece, preparation method of positive pole piece and lithium ion battery
  • Positive lithium supplement additive, positive pole piece, preparation method of positive pole piece and lithium ion battery
  • Positive lithium supplement additive, positive pole piece, preparation method of positive pole piece and lithium ion battery

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Effect test

Embodiment 1

[0078] This embodiment provides a preparation method of a positive electrode lithium supplement additive, and the preparation method specifically includes the following steps:

[0079] (1) Lithium oxide and nickel oxide are mixed uniformly at a molar ratio of 1:1 to obtain a mixed material, and the grinding ball and the mixed material are ball milled at a speed of 500rpm / min for 13h at a mass ratio of 0.8:1, and then Gas atmosphere, calcination at 600°C for 18 hours, and after cooling, a lithium-rich lithium nickelate material was obtained;

[0080] (2) Mix the lithium-rich lithium nickelate material prepared in step (1) with the aluminum nitrate solution with a concentration of 3mol / L at a mass ratio of 1:1.6, and stir for 10min at a speed of 300rpm / min for wet coating , and then filter and separate the wet slurry, dry it in an argon atmosphere at a temperature of 100°C for 18 hours, then sinter it at a temperature of 600°C in an argon atmosphere for 18 hours, and obtain a po...

Embodiment 2

[0086] This embodiment provides a preparation method of a positive electrode lithium supplement additive, and the preparation method specifically includes the following steps:

[0087] (1) Lithium oxide and nickel oxide are mixed uniformly at a molar ratio of 0.9:1 to obtain a mixed material, and the grinding ball and the mixed material are ball milled at a speed of 400 rpm / min for 14 hours at a mass ratio of 0.5:1, and then Gas atmosphere, calcination at a temperature of 500 ° C for 24 hours, and obtained a lithium-rich lithium nickelate material after cooling;

[0088] (2) Mix the lithium-rich lithium nickelate material prepared in step (1) with the aluminum borate solution with a concentration of 1mol / L at a mass ratio of 1:2, and stir for 12min at a speed of 280rpm / min for wet coating , and then filter and separate the wet slurry, dry it in an argon atmosphere at a temperature of 60°C for 24 hours, then sinter it in an argon atmosphere at a temperature of 500°C for 24 hour...

Embodiment 3

[0094] This embodiment provides a preparation method of a positive electrode lithium supplement additive, and the preparation method specifically includes the following steps:

[0095] (1) Lithium oxide and nickel oxide are mixed uniformly at a molar ratio of 1.1:1 to obtain a mixed material, and the grinding ball and the mixed material are ball milled at a speed of 600rpm / min for 12h at a mass ratio of 1:1, and then Gas atmosphere, calcination at a temperature of 700°C for 12 hours, and after cooling, a lithium-rich lithium nickelate material was obtained;

[0096] (2) Mix the lithium-rich lithium nickelate material prepared in step (1) with the aluminum oxalate solution with a concentration of 5mol / L at a mass ratio of 1:1.2, and stir for 8min at a speed of 320rpm / min for wet coating , and then the wet slurry separated by filtration is dried in an argon atmosphere at a temperature of 150° C. for 12 hours, and then sintered in an argon atmosphere at a temperature of 700° C. f...

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Abstract

The invention provides a positive pole lithium supplement additive, a positive pole piece, a preparation method of the positive pole piece and a lithium ion battery, and the preparation method of the positive pole lithium supplement additive comprises the following steps: mixing a lithium source and a nickel source, and sequentially carrying out ball milling and calcination to obtain a lithium-rich material, mixing the lithium-rich material with a metal ion solution, and carrying out wet coating to obtain the positive electrode lithium supplement additive. The metal oxide layer is formed on the surface of the lithium-rich material through wet coating, so that internal residual lithium is effectively prevented from being in contact with external air to generate residual alkali, the residual alkali can be prevented from being dissolved out, and the residual alkali value of the positive electrode additive is effectively reduced. In addition, the positive electrode lithium supplement additive provided by the invention can effectively reduce the viscosity of positive electrode slurry, the slurry coating is more uniform, the manufacturing quality of a positive electrode plate is improved, and meanwhile, the electrochemical performance of a lithium ion battery is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a positive electrode lithium supplement additive, a positive electrode sheet, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, and good safety performance, and have been widely used in portable electronic products and electric vehicles. With the rapid development of new energy vehicles, smart grids, and distributed energy storage, higher requirements are placed on the energy density of lithium-ion batteries. However, during the first charging process of lithium-ion batteries, a solid electrolyte film will be formed on the surface of the negative electrode, which consumes the active lithium in the positive electrode, making it difficult to further increase the energy density of the battery. [0003] At present, the positive electrode lith...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M4/13H01M4/139H01M10/0525
CPCH01M10/0567H01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 李昊莫方杰刘永兴李若楠孙化雨
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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