Positive pressure chernical synthesis method of secondary lithium ion cell opening and method for making cell by it

A chemical formation method and lithium ion technology, applied in the direction of secondary battery charging/discharging, secondary battery, electrolyte storage battery manufacturing, etc., can solve the problems of battery performance degradation, achieve capacity and life improvement, reduce the risk of flatulence, reduce The effect of manufacturing costs

Inactive Publication Date: 2003-04-23
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The battery production process of each manufacturer is different, and the setting parameters of the initial charge are different. The formed

Method used

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Embodiment Construction

[0032] 1. By weight percentage (the same below), 92% of the positive electrode active material lithium cobaltate, 4% of the conductive agent graphite and 4% of the polyvinylidene fluoride binder are used as a solvent with N-methylpyrrolidone. into a paste. Using 20μm aluminum foil as a current collector, the paste is coated on the aluminum foil, and dried, rolled, etc., to make a positive electrode sheet with a thickness of 170μm.

[0033] 2. Mix 90% negative electrode active material carbon / graphite material MCMB, 2% conductive agent (same as above), and 8% adhesive (same as above), and use N-methylpyrrolidone as solvent to make a paste. Using a 10 μm aluminum foil as a current collector, the paste was coated on the aluminum foil, dried and rolled to make a negative electrode sheet with a thickness of 160 μm.

[0034] 3. The diaphragm material is a non-woven film made of polypropylene resin, polyethylene resin, surface treated and laminated.

[0035] 4. The electrolyte is a...

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Abstract

The secondary lithium ion cell opening positive pressure formation method includes the following steps: using the aged cell in which the electrolyte in injected, sealing its electrolyte-injecting hole with adhesive paper, placing said cell on the charging cabinet, using small current to make constant current charge by 0.01-1c, then using 0.05C-10C heavy current to make constant current charge andageing at 30-80 deg.C for 0.5-160 hr. Said method for making cell includes production of positive pole piece anjd negative pole piiece, after aged, it is used for making cell, and can be used for raising cell volume and prolonging service life of cell.

Description

technical field [0001] The invention relates to a secondary lithium ion battery, in particular to a secondary lithium ion battery opening positive pressure forming method and a method for manufacturing the battery. Background of the invention [0002] At present, the formation method of the secondary lithium ion battery is carried out after the battery is completed and the liquid injection hole is sealed. The formation process changes the charging process, such as setting the current, temperature, time and pressure, to form a protective film on the electrode surface. The disadvantage of this method is that the harmful gas produced by the side reaction accompanying the main reaction cannot be eliminated in time, but is stored inside the battery as an impurity, which continues to interfere and destroy the charge and discharge reaction of the battery. [0003] For lithium-ion batteries, when charging for the first time, due to the electrochemical reaction, a passivation thin l...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/44
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 陈疆沈培康
Owner SUN YAT SEN UNIV
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