Stripping material of air-stable positive electrode active material for cylindrical lithium-ion batteries

A positive electrode active material and lithium-ion battery technology, which is applied in the direction of recycling by waste collectors, etc., can solve the problems of destroying original physical properties, damage to positive electrode active materials, unfavorable research, etc., and achieve the effects of reducing consumption, low cost, and avoiding cumbersome procedures

Inactive Publication Date: 2018-03-09
HUBEI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improving the comprehensive performance of lithium-ion battery cathode materials to meet its increasing requirements for energy storage has always been the most important research direction in the field of lithium-ion batteries. In the prior art, mechanical stripping is often used to strip the positive electrode active materials of lithium batteries. Due to The positive electrode active material is closely combined with the electrode sheet, and the mechanical peeling process will cause damage to the positive electrode active material and destroy its original physical properties, which is not conducive to further research on it

Method used

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  • Stripping material of air-stable positive electrode active material for cylindrical lithium-ion batteries
  • Stripping material of air-stable positive electrode active material for cylindrical lithium-ion batteries
  • Stripping material of air-stable positive electrode active material for cylindrical lithium-ion batteries

Examples

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Effect test

Embodiment 1

[0030] (1) Fill a well-sealed glove box with high-purity argon, check the water and oxygen analysis instrument panel to control the water and oxygen content to drop to 5ppm, and then put a cylindrical lithium-ion battery of the brand SANYO model 18650 in the glove box After cutting off the first and last metal shells with a cutting machine, carefully pull out the battery cells, then slowly pull apart the positive and negative pole pieces that are spirally wound, separate the positive pole pieces that are coated with active materials on both sides, and immerse them Wash and soak in DMC solvent for 30 minutes to remove residual electrolyte. Since it is still unclear whether the positive electrode active material can exist stably in the air, to be on the safe side, move the sample into the transition chamber for long-term vacuum drying to obtain a clean double-sided positive electrode. piece;

[0031] (2) Cut out a small piece of 3cm×3cm positive electrode sample in the glove box...

Embodiment 2

[0036] (1) Fill a well-sealed glove box with high-purity argon, check the water and oxygen analysis instrument panel to control the water and oxygen content to drop to 5ppm, and then put a cylindrical lithium-ion battery of the brand SANYO model 18650 in the glove box After cutting off the first and last metal shells with a cutting machine, carefully pull out the battery cells, then slowly pull apart the positive and negative pole pieces that are spirally wound, separate the positive pole pieces that are coated with active materials on both sides, and immerse them Wash and soak in DMC solvent for 30 minutes to remove residual electrolyte. Since it is still unclear whether the positive electrode active material can exist stably in the air, to be on the safe side, move the sample into the transition chamber for long-term vacuum drying to obtain a clean double-sided positive electrode. piece;

[0037] (2) Cut out a small piece of 3cm×3cm positive electrode sample in the glove box...

Embodiment 3

[0042] (1) Fill a well-sealed glove box with high-purity argon, check the water and oxygen analysis instrument panel to control the water and oxygen content to drop to 5ppm, and then put a cylindrical lithium-ion battery of the brand SANYO model 18650 in the glove box After cutting off the first and last metal shells with a cutting machine, carefully pull out the battery cells, then slowly pull apart the positive and negative pole pieces that are spirally wound, separate the positive pole pieces that are coated with active materials on both sides, and immerse them Wash and soak in DMC solvent for 30 minutes to remove residual electrolyte. Since it is still unclear whether the positive electrode active material can exist stably in the air, to be on the safe side, move the sample into the transition chamber for long-term vacuum drying to obtain a clean double-sided positive electrode. piece;

[0043] (2) Cut out a small piece of 3cm×3cm positive electrode sample in the glove box...

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Abstract

The invention provides a stripping material of an air-stable positive electrode active material for cylindrical lithium-ion batteries. According to the method, as alkali liquor reacts with aluminum foil to form hydrogen gas, the positive electrode active material and a current collector come off automatically, and influence from the external to the electrode during coming off is avoided completely. Further, since the lithium-insertion material air stability test is carried out in advance, the original property of the positive electrode active material is maintained completely under double guarantees; thus, the follow-up research on the property of materials is facilitated. Besides, the positive electrode which is coated with the active material on both sides is changed into the positive electrode which is coated with the active material on only one side within a short time, and accordingly the research progress on the positive electrode active material for assembled button cells is accelerated.

Description

technical field [0001] The invention relates to the field of stripping positive electrode active materials of lithium ion batteries, in particular to a method for stripping air-stable positive electrode active materials of cylindrical lithium ion batteries. Background technique [0002] The most representative components of a lithium-ion battery are a carbon-based negative electrode and an air-stable positive electrode with a lithium-intercalated transition metal oxide as the main component. After the assembly is completed, the battery is in a discharged state. As the charging process proceeds, lithium atoms lose electrons and come out of the positive electrode active material, enter the electrolyte in the form of ions, and reach the negative electrode through the action of the electric field, so that the electrons are re-embedded in the negative electrode carbon-based active material. Therefore, lithium atoms in lithium-intercalated transition metal oxides act as the only l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
Inventor 杨昌平平俊梁世恒王瑞龙徐玲芳宫华扬杨辅军
Owner HUBEI UNIV
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