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A kind of preparation method of membrane electrode of lithium ion battery

A lithium-ion battery, membrane electrode technology, applied in battery electrodes, electrode manufacturing, electrolyte storage battery manufacturing and other directions, can solve the problems of poor bonding force between electrode active materials and metal foils, restricted mechanical properties, shortened service life, etc. Effects of capacity and cycle performance, improved reliability and safety, and improved energy density

Active Publication Date: 2018-02-09
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process has certain advantages, it also has some disadvantages: the binding force between the electrode active material and the metal foil is relatively poor. Volume expansion and contraction occur, and the resulting mechanical stress causes the electrode material to gradually change during the cycle, causing cracking and peeling of the electrode and metal foil, resulting in large polarization of the battery, serious capacity loss, and poor cycle performance , shortened service life
At present, the separator of lithium-ion batteries is a thin film with a microporous structure, which enables lithium ions to be transported through the micropores, but its mechanical properties are restricted by porosity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Take 20ml of polymethyl methacrylate solution with a concentration of 20wt%, pour it into a polytetrafluoroethylene membrane maker with a diameter of 80°C, and obtain a lithium-ion membrane substrate with a thickness of 20um after drying at 80°C;

[0025] (2) Take the lithium ion negative electrode material lithium titanate and acetylene black and grind them evenly, place them in a vacuum drying oven at 80°C / 12h, and dry to obtain the negative electrode conductive drying material for use; take the lithium ion positive electrode material LiFePO 4 After being evenly ground with acetylene black, place it in a vacuum drying oven at 80°C / 12h, and dry to obtain the positive electrode conductive drying material for use;

[0026] (3) Take the polymethyl methacrylate solution and add it to N-methylpyrrolidone (NMP) as a dispersant, stir for 2 hours, then add the negative electrode conductive drying material obtained in step (2), stir for 3 hours, and coat it on the lithium O...

Embodiment 2

[0031] (1) Take 50ml of polyurethane solution with a concentration of 30wt%, pour it into a polytetrafluoroethylene membrane maker, and dry it at 150°C to obtain a lithium ion membrane substrate with a thickness of 50um;

[0032] (2) Take lithium ion negative electrode material graphite and XC72 carbon black and grind evenly, put it in a vacuum drying oven at 80°C / 12h, and dry to obtain negative electrode conductive drying material for use; take lithium ion positive electrode material LiFePO 4 After being evenly ground with XC72 carbon black, place it in a vacuum drying oven at 80°C / 12h, and dry to obtain a positive electrode conductive drying material for use;

[0033] (3) Take the polyurethane solution and add it to N-methylpyrrolidone (NMP) as a dispersant, stir for 4 hours, then add the negative electrode conductive drying material obtained in step (2), stir for 5 hours, and coat it on the lithium ion on the film substrate and dried;

[0034] (4) Take the polyurethane sol...

Embodiment 3

[0038] (1) Take 25ml of polyethylene naphthalate solution with a concentration of 25wt%, pour it into a polytetrafluoroethylene membrane maker, and dry it at 140°C to obtain a lithium ion membrane substrate with a thickness of 28um;

[0039] (2) Take the lithium ion negative electrode material lithium titanate and SP carbon black and grind them evenly, put them in a vacuum drying oven at 80°C / 12h, and dry to obtain the negative electrode conductive drying material for later use; take the lithium ion positive electrode material LiFeMnPO 4 After being evenly ground with SP carbon black, place it in a vacuum drying oven at 80°C / 12h, and dry to obtain a positive electrode conductive drying material for use;

[0040] (3) Add polyethylene naphthalate solution into N-methylpyrrolidone (NMP) as a dispersant, stir magnetically for 3 hours, then add the negative electrode conductive drying material obtained in step (2), stir for 4 hours, coat Cover one side of the lithium ion membrane s...

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PUM

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Abstract

The invention relates to a preparation method of a lithium-ion battery membrane electrode, comprising: preparing a lithium-ion membrane matrix; taking lithium-ion negative electrode materials and lithium-ion positive-electrode materials and grinding them uniformly with a conductive agent respectively, drying them for later use; taking a polymer ester solution and adding After mixing N-methylpyrrolidone and negative electrode drying material, apply it to one side of the lithium-ion membrane substrate and dry it; take the polymer ester solution and add N-methylpyrrolidone and positive electrode drying material to stir, and then coat it on the lithium ion membrane substrate. The other side of the ionic membrane matrix is ​​dried and pressed into shape; the pressed product is pressed to obtain a lithium-ion battery membrane electrode; the obtained lithium-ion battery membrane electrode is placed in the battery case and dripped with electrolyte to make the membrane electrode fully Absorb and dry the unabsorbed electrolyte on the surface to obtain a membrane electrode full battery. The lithium ion battery membrane electrode prepared by the method has fast ion conduction, excellent electrode reaction reversibility, good cycle performance and safety performance, simple preparation process, low production cost, and is favorable for commercial production.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a membrane electrode of a lithium ion battery. Background technique [0002] The positive electrode material and the negative electrode material of the traditional lithium-ion battery are connected through a separator, and the electrode composite material of the positive and negative electrode layers is formed by coating aluminum foil and copper foil with a binder. Although this process has certain advantages, it also has some disadvantages: the binding force between the electrode active material and the metal foil is relatively poor. Volume expansion and contraction occur, and the resulting mechanical stress causes the electrode material to gradually change during the cycle, causing cracking and peeling of the electrode and metal foil, resulting in large polarization of the battery, serious capacity loss, and poor cycle performance , shorten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/139H01M10/0525H01M10/058
CPCH01M4/0402H01M4/139H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 朱文婷杨尘杨茂萍杨续来
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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