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Mixing and coating technology for production of positive and negative pole pieces of lithium ion battery

A lithium-ion battery and coating process technology, applied in battery electrodes, electrode manufacturing, electrode extrusion, etc., can solve the problems of large consumption of NMP, long production process, high energy consumption, etc., and achieve the effect of saving energy and shortening the length

Inactive Publication Date: 2014-02-12
陈煜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned problems of too long production process, too large consumption of NMP, too high energy consumption, and too low degree of equipment automation, the present invention provides a process with less time and energy consumption and faster speed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] Dissolve PVDF in NMP to form a 40% solution.

[0013] Weigh an appropriate amount of electrode active materials (lithium iron phosphate, lithium manganese oxide, lithium cobaltate, ternary materials, etc.) and conductive agent, and the solution obtained in step 1, and put them into the rough mixing equipment and mix for 20 minutes.

[0014] The coarsely mixed material is fed into the extruder through a screw feeder, and the temperature of the extruder is set to: 90°C for stage 1, 110°C for stage 2, and 110°C for stage 3. A filter that can be heated is connected to the outlet of the extruder, the temperature of the filter is 110° C., and the filter aperture is 200 mesh.

[0015] The filtered material from the extruder was directly directed to a transfer coater at a temperature of 110°C for coating.

[0016] The coated pole pieces are sent to a 20-meter-long oven for drying.

[0017] The finished product is wound, or directly connected to the rolling process.

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PUM

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Abstract

The invention relates to a mixing and coating technology for production of positive and negative pole pieces of a lithium ion battery. Compared with the traditional technology, the technology can simplify a mixing process, and can reduce the production time and the production energy consumption. A mixing procedure is that various raw materials are mixed simply, and then the roughly mixed raw materials are subjected to high-temperature short-time fine mixing by an extrusion machine. The materials coming out of the mixing procedure are sent to a high-temperature coating machine for coating, and then enter a shortened oven for solvent removal.

Description

technical field [0001] The invention belongs to the field of lithium ion battery production technology, in particular to a slurry mixing and coating process for the production of lithium ion battery positive and negative plates. Background technique [0002] At present, the production process of positive and negative electrodes of lithium-ion batteries is long, time-consuming, energy-intensive, labor-intensive, and highly demanding on the environment. For oily pole pieces, since the NMP in the formula needs to be removed, this process will also pollute the environment and pose a threat to the personal health of operators. Starting from the raw material preparation stage, it includes mixing-pulping-filtering-coating-drying-rolling and other processes. Among them, the beating process needs 3-20 hours depending on the material, formula and equipment. And if the beating effect does not meet the process control requirements, it is necessary to perform another beating process of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139
CPCY02E60/122H01M4/0402H01M4/0411H01M4/139Y02E60/10
Inventor 陈煜
Owner 陈煜
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