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Lithium ion battery pole piece and preparation method thereof

A lithium-ion battery, pole piece technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve problems such as uneven distribution of binders, increase bulkiness and uniformity, large area density, reduce Effects of process and energy consumption

Pending Publication Date: 2022-01-11
TIG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of the traditional lithium-ion battery pole piece, such as the need for drying and uneven distribution of the binder due to the use of solvents, the present invention aims to provide a technical solution that can solve the above problems, which can be widely used in battery pole pieces production field

Method used

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  • Lithium ion battery pole piece and preparation method thereof

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Effect test

Embodiment 1

[0032] Ultrasonic dispersion is used to uniformly mix active materials, conductive agents, binders and other powder materials; among them, the active materials include: lithium nickel cobalt manganese oxide, lithium iron phosphate, artificial graphite, silicon carbon negative electrode, lithium titanate;

[0033] Conductive agents include: carbon black, carbon nanotubes, graphene;

[0034] Binders include: PTFE, PVDF, polyacrylic acid, polyacrylonitrile.

[0035] Concrete preparation steps are as follows:

[0036] (1) Evenly mix powder materials such as active materials, conductive agents, and binders to obtain a powder mixture;

[0037] (2) Use a jet mill to fibrillate the binder in the powder mixture and transfer it to the first chamber with static electricity in the shell;

[0038] (3) Stir the powder mixture to make it contact with the first chamber to obtain static electricity. The powder mixture is charged with the same static electricity and undergoes electrostatic re...

Embodiment 2

[0044] Use mechanical stirring to uniformly mix powder materials such as active materials, conductive agents, and binders; among them,

[0045] Active materials include: lithium manganate, natural graphite, silicon carbon negative electrode, lithium titanate;

[0046] Conductive agents include: carbon black, graphene;

[0047] Binders include: PTFE, PVDF.

[0048] Concrete preparation steps are as follows:

[0049] (1) Evenly mix powder materials such as active materials, conductive agents, and binders to obtain a powder mixture;

[0050] (2) Use a jet mill to fibrillate the binder in the powder mixture and transfer it to the first chamber with static electricity in the shell;

[0051] (3) Stir the powder mixture to make it contact with the first chamber to obtain static electricity. The powder mixture is charged with the same static electricity and undergoes electrostatic repulsion, and the powder mixture becomes more fluffy and has a certain fluidity;

[0052] (4) Use an...

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PUM

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Abstract

The invention relates to the field of battery pole pieces, and discloses a lithium ion battery pole piece which comprises an active substance, a conductive agent and a binder, and the active substance, the conductive agent and the binder are all powder materials. Compared with the prior art, the lithium ion battery pole piece has the beneficial effects that solvent dispersion is not needed, procedures and energy consumption in the pole piece manufacturing process are reduced, the pole piece with higher compaction and larger surface density can be prepared, and the energy density and the cycle life of the lithium ion battery can be effectively improved and prolonged; the bulkiness and uniformity of a powder mixture are improved in a same charge electrostatic repulsion mode, then powder is deposited into a film through the principle that different charges attract, and the problem that dry powder is not prone to forming the film is solved.

Description

technical field [0001] The invention relates to the field of battery pole pieces, in particular to a lithium ion battery pole piece and a preparation method thereof. Background technique [0002] At present, the production of pole pieces of lithium-ion batteries must first disperse active materials, conductive additives and binders in water or organic solvents, and then evenly coat the dispersed slurry on the current collector, and finally heat the Evaporate water or organic solvents to obtain stable pole pieces. The electrode drying process of this production method consumes a lot of energy, and the commonly used organic solvent NMP has certain toxicity and causes certain pollution to the environment. In addition, during the drying process of the pole piece, the binder will float up with the volatilization of the solvent, and the final formation of the inside of the pole piece will be unevenly distributed, resulting in insufficient adhesion between the coating and the curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/36H01M4/62
CPCH01M4/13H01M4/36H01M4/139H01M4/625H01M4/622H01M4/364Y02E60/10
Inventor 唐政张俊峰杨国庆阎贵东李卫东
Owner TIG TECH CO LTD