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Method for preparing lithium battery pole piece with low solvent and prepared pole piece

A lithium battery, low-solvent technology, applied in battery electrodes, secondary batteries, electrode heat treatment, etc., can solve the problems of high cost of pole pieces and difficulty in mass production, and improve the conductivity, energy density, thickness and gap of pole pieces The effect of easy control and low cost

Inactive Publication Date: 2021-08-03
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the prior art, the preparation of pole pieces by dry process has the problems of high cost, high difficulty in mass production, and difficulty in controlling the uniformity of the sheet.

Method used

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  • Method for preparing lithium battery pole piece with low solvent and prepared pole piece
  • Method for preparing lithium battery pole piece with low solvent and prepared pole piece

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A method for preparing lithium battery graphite negative plate with low solvent, comprising the following steps:

[0031] (1) Mix graphite and conductive agent super-P (SP) in a fluidized dry mixing equipment with a mass ratio of 95:2 for 30 minutes at a fluidization temperature of 120°C, and keep the powder in a fluidized state during the spraying process; After spraying, keep the powder in a fluidized state until the powder is dry to obtain a powder.

[0032] (2) Take PTFE water emulsion with 60% solid content, weigh the emulsion according to the mass ratio of PTFE and graphite of 3:95, add water and dilute to 40% solid content.

[0033] (3) Atomize the PTFE aqueous emulsion diluted in step (2) onto the powder in step (1) by two-fluid spray; continue fluidizing for 30 minutes after the atomization is completed to remove the moisture.

[0034] (4) The powder obtained in step (3) is rolled twice at 150°C to make a self-supporting pole piece, such as figure 1 As shown,...

Embodiment 2

[0038] A method for preparing lithium battery silicon carbon pole pieces with low solvent, comprising the following steps:

[0039] (1) Mix silicon carbon and SP in a fluidized dry mixing equipment with a mass ratio of 94:2 for 30 minutes, the fluidization temperature is 120°C, keep the powder in a fluidized state during the spraying process; keep the powder after the spraying Fluidized state until the powder is dry to obtain powder.

[0040] (2) Take PTFE water emulsion with 60% solid content, weigh the emulsion according to the mass ratio of PTFE and silicon carbon of 4:94, and then add water to dilute to 40% solid content.

[0041] (3) Atomize the PTFE aqueous emulsion diluted in step (2) onto the powder in step (1) by two-fluid spray; continue fluidizing for 30 minutes after the atomization is completed to remove the moisture.

[0042] (4) The powder obtained in step (3) is hot-rolled twice at 150°C to make a self-supporting pole piece, the thickness of the first film is ...

Embodiment 3

[0045] A method for preparing a lithium iron phosphate pole piece with a low solvent, comprising the following steps:

[0046] (1) Mix lithium iron phosphate, SP, and carbon nanotubes (CNT) in a fluidized dry mixing equipment with a mass ratio of 93:1:1 for 30 minutes at a fluidization temperature of 150°C. During the spraying process, keep the powder at Fluidized state; after spraying, keep the powder in a fluidized state until the powder is dry to obtain powder.

[0047] (2) Take PTFE water emulsion with 60% solid content, weigh the emulsion according to the mass ratio of PTFE and lithium iron phosphate of 5:93, and then add water to dilute to 30% solid content.

[0048] (3) Atomize the PTFE aqueous emulsion diluted in step (2) onto the powder in step (1) through two-fluid spray; continue to fluidize for 30 minutes after the atomization is completed to remove the water.

[0049] (4) The powder obtained in step (3) is hot-rolled twice at 160°C to make a self-supporting pole ...

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Abstract

The invention discloses a method for preparing a lithium battery pole piece with a low solvent, and relates to the technical field of lithium ion batteries, and the method comprises the following steps: (1) mixing an active material and a conductive agent in fluidized dry mixing equipment to obtain powder A; (2) atomizing a liquid containing a binder, spraying the atomized liquid on the powder A, keeping the powder in a fluidized state in the spraying process, and keeping the powder in the fluidized state until the powder is dried after spraying to obtain powder B; (3) performing high-temperature hot pressing on the powder B to obtain the self-supporting pole piece; and (4) compounding the pole piece and the glued current collector by adopting a thermal compounding process to obtain the lithium battery pole piece. The beneficial effects are that compared with the traditional process, the preparation method disclosed by the invention has the advantages of low solvent consumption, low cost, environmental friendliness, compaction, easiness in thickness and void ratio control and the like. Compared with a pure dry-method pole piece process, the method has the advantages that the processing performance is better, the using amount of the binder is reduced, and the conductivity and the energy density of the pole piece are improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing lithium battery pole pieces with low solvent and the prepared pole pieces. Background technique [0002] With the development of lithium battery technology, the demand for lithium batteries continues to grow, and the positive and negative electrodes in the current lithium battery manufacturing process are wet-coated. The wet coating technology uses NMP as a solvent to disperse the binder, active material, and conductive agent at high speed to make a high-viscosity slurry, then wet-coat the slurry on the surface of the current collector, and then enter the high-temperature oven to evaporate the solvent Dry to get pole pieces. The pole piece prepared by this method has the disadvantages of large amount of solvent used, toxicity of the solvent, unfriendly environment, high energy consumption and the like. [0003] Due to the above shortcomings ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/1393H01M4/1395H01M4/1397H01M4/04H01M4/131H01M4/133H01M4/134H01M4/136H01M10/0525
CPCH01M4/1391H01M4/1393H01M4/1395H01M4/1397H01M4/0435H01M4/0471H01M4/131H01M4/133H01M4/134H01M4/136H01M10/0525Y02E60/10
Inventor 戴首李洋朱冠楠王义飞曹勇许涛
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY