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A kind of positive electrode slurry and preparation method thereof

A technology of positive electrode slurry and positive active material, which is applied in battery electrodes, secondary battery repair/maintenance, structural parts, etc., can solve problems such as difficult to meet the safety requirements of high specific energy power batteries, and achieve reduction of standing time, The effect of little influence on electrochemical performance and high safety

Active Publication Date: 2021-10-15
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the safety of lithium-ion batteries, people have done a lot of work. They have successively developed high-nickel positive electrode materials with surface coating modification, ceramic coating modified separators, and high-voltage and high-ignition electrolytes. The safety of lithium-ion batteries Performance has been significantly improved, but it is still difficult to meet the safety requirements of high specific energy power batteries

Method used

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  • A kind of positive electrode slurry and preparation method thereof
  • A kind of positive electrode slurry and preparation method thereof
  • A kind of positive electrode slurry and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Dissolve 1.5g PVDF in 28.5g NMP to obtain PVDF glue;

[0038] (2) Mix the above PVDF glue with 0.5g of polyphosphazene A with a number average molecular weight of 10000, add 1.0g of carbon nanotubes, stir at 50°C and 3000r / min for 8h, and obtain a conductive and flame-resistant glue;

[0039] (3) Add 97g NCM523 to the above-mentioned conductive flame-resistant rubber solution, stir at a high speed to disperse evenly, add an appropriate amount of NMP, and prepare positive electrode slurry with a solid content of 60%;

[0040] (4) Scrape-coat the above positive electrode slurry on both sides of the aluminum foil current collector, and dry at 80°C for 4 hours to obtain a positive electrode sheet with an areal density of 15 g / cm 2 .

[0041] A 2032 button battery was assembled by using the positive pole piece prepared in Example 1. After testing, the 0.1C discharge specific capacity of the positive material was 167.9 mAh / g, and the initial efficiency was 88.8%.

[004...

Embodiment 2

[0047] (1) Dissolve 2.5g PVDF in 22.5g NMP to obtain PVDF glue;

[0048] (2) Mix the above-mentioned PVDF glue with 1.5g of polyphosphazene B with a number average molecular weight of 1,000,000, add 5.0g of conductive carbon black, stir at 50°C and 3000r / min for 10h, and obtain a conductive flame-resistant glue;

[0049] (3) Add 91g of NCM622 to the above-mentioned conductive flame-resistant rubber solution, stir at high speed to disperse evenly, add an appropriate amount of NMP, and prepare positive electrode slurry with a solid content of 60%;

[0050] (4) Scrape-coat the positive electrode slurry on both sides of the current collector, and dry it at 80°C for 4 hours to obtain a positive electrode sheet, the surface density of which is 35g / cm 2 .

[0051] A 2032 button battery was assembled by using the positive electrode sheet prepared in Example 2. After testing, the 0.1C discharge specific capacity of the positive electrode material was 178.9 mAh / g, and the initial effic...

Embodiment 3

[0056] (1) 3gPVDF was dissolved in 47gNMP to obtain PVDF glue;

[0057] (2) Mix the above PVDF glue with 2.0g of polyphosphazene C with a number average molecular weight of 80,000, add 5.0g of conductive carbon black and carbon nanotubes with a mass ratio of 1:1, and stir for 8h at 50°C and 3000r / min , to obtain conductive flame-resistant glue;

[0058] (3) Add 90g of NCM (the molar ratio of nickel, cobalt, and manganese is 7:1.5:1.5) to the above-mentioned conductive flame-resistant rubber solution, stir at high speed to disperse evenly, add an appropriate amount of NMP, and prepare positive electrode slurry with a solid content of 60%;

[0059] (4) Scrape-coat the above positive electrode slurry on both sides of the current collector, dry at 80°C for 4 hours to obtain a positive electrode sheet, the surface density of the positive electrode sheet is 15g / cm 2 .

[0060] A 2032 button battery was assembled by using the positive pole piece prepared in Example 3. After testing...

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Abstract

The invention relates to the technical field of lithium ion battery materials, in particular to a positive electrode slurry and a preparation method thereof. The positive electrode slurry includes 85 to 97 parts by weight of positive electrode active materials, 1 to 6 parts by weight of a conductive agent, 1 to 5 parts by weight of a binder, 0.5 to 8 parts by weight of a flame retardant and a solvent; the flame retardant has 10000 To the number average molecular weight of 500000 and the general structural formula is as follows: Wherein, R 1 and R 2 same or different, independently representing C 1‑10 Alkyl, C 2‑10 Alkenyl, C 2‑10 Alkynyl, C 3‑10 Cycloalkyl, C 3‑10 Cycloalkenyl, C 6‑15 Aryl or C 5‑15 heteroaryl, the R 1 and R 2 One or more hydrogens in can optionally be replaced by fluorine, C 1‑10 Alkyl or C 6‑15 Aryl substitution. The positive electrode sheet prepared by adding the specific flame retardant to the positive electrode slurry in the invention has excellent high temperature resistance and flame retardancy, and the prepared lithium ion battery has high safety.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a positive electrode slurry and a preparation method thereof, a positive electrode sheet and a lithium ion battery containing the positive electrode sheet. Background technique [0002] In recent years, lithium-ion batteries have shown strong vitality in the field of electric vehicles. In order to meet the development requirements of electric vehicles, lithium-ion batteries with high specific energy and high specific power have become the most important development direction in the field of secondary energy and have received the most extensive attention. Research. However, with the continuous improvement of energy density and power density, the safety problem of lithium-ion batteries has become increasingly prominent, which has become one of the main contradictions hindering the development and application of lithium-ion batteries. There are many factors tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/42H01M4/131H01M10/0525
CPCH01M4/131H01M4/362H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/4235Y02E60/10
Inventor 刘丙学齐小鹏张海燕庞静杨海许伟程
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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