Method for preparing lithium-ion secondary battery

A secondary battery, lithium ion technology, used in secondary batteries, battery electrodes, electrode manufacturing, etc., can solve the problem of easy detachment of porous membranes, and achieve the effect of preventing agglomeration or sedimentation, improving dispersibility, and not being damaged.

Inactive Publication Date: 2010-11-03
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the porous film in the existing lithium ion battery is

Method used

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  • Method for preparing lithium-ion secondary battery

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Example Embodiment

[0027] The preparation method of the positive electrode sheet and the negative electrode sheet can adopt various methods known in the art.

[0028] According to the lithium ion secondary battery provided by the present invention, the electrolyte is a non-aqueous electrolyte. The non-aqueous electrolyte is a solution of electrolyte lithium salt in a non-aqueous solvent, and conventional non-aqueous electrolytes known to those skilled in the art can be used. For example, the electrolyte lithium salt can be selected from lithium hexafluorophosphate (LiPF6), lithium perchlorate (LiClO4), lithium tetrafluoroborate (LiBF4), lithium hexafluoroarsenate (LiAsF6), lithium hexafluorosilicate (LiSiF6), tetraphenylborate Lithium (LiB(C6H5)4), lithium chloride (LiCl), lithium bromide (LiBr), lithium chloroaluminate (LiAlCl4) and lithium fluoroalkyl sulfonate (LiC(SO2CF3)3), LiCH3SO3, LiN(SO2CF3)2 One or more of them. The non-aqueous solvent can be selected from mixed solutions of linear acid...

Example Embodiment

[0031] Example 1

[0032] This embodiment is used to illustrate the preparation of the lithium ion secondary battery provided by the present invention.

[0033] 1. Preparation of positive electrode

[0034] Dissolve 60 grams of polyvinylidene fluoride (PVDF) in 770 grams of N-methyl-2-pyrrolidone (NMP) solvent to prepare a binder solution, and then mix 2000 grams of positive active material lithium cobalt oxide (LiCoO2) with 40 Add gram of acetylene black powder to the above solution, and then add 200 grams of N-methyl-2-pyrrolidone (NMP), stir and mix well to obtain a positive electrode slurry; use a stretcher to evenly coat the positive electrode slurry on Both sides of the aluminum foil were heated and dried under vacuum at 125°C for 2 hours, rolled, and cut into pieces to obtain a positive electrode of 750 mm (length) × 55.5 mm (width) × 83 microns (thickness), each of which contains 10 grams of positive electrode active material LiCoO2.

[0035] 2. Preparation of negative elect...

Example Embodiment

[0043] Example 2

[0044] This embodiment is used to illustrate the preparation of the lithium ion secondary battery provided by the present invention.

[0045] The lithium ion secondary battery was prepared according to the method of Example 1, except that the additive mixture used to prepare the porous membrane slurry used 7 grams of 20% ethylamine solution with a mass concentration of 7 grams, and the pH value of the slurry was adjusted to 9.

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Abstract

The invention provides a method for preparing a lithium-ion secondary battery in order to solve the problem that a porous film in the conventional lithium-ion battery is easy to drop. The method comprises the following step of: preparing a positive plate and a negative plate. The method also comprises the following steps of: a) mixing inorganic filler, aqueous adhesive, additive and solvent to form paste, wherein the additive is one or more of weakly alkaline aqueous solution of amine, aqueous solution of ammonia and salt solution of ammonium, or weakly acid aqueous solution of acid organic compound, and the inorganic filler is one or more inorganic oxides which are not dissolved into the additive; and b) coating the prepared paste on at least one surface of the positive plate and/or the negative plate, and drying the positive plate and/or the negative plate to form a porous film on the surface coated with the paste. The porous film formed by adopting the technical scheme of the invention is difficult in dropping, has good flexibility and is difficult to break during processing such as winding and the like.

Description

【Technical field】 [0001] The invention relates to the preparation of lithium-ion secondary batteries, in particular to the field of forming porous membranes on the surface of battery pole pieces in the preparation of secondary batteries. 【Background technique】 [0002] Lithium-ion secondary batteries have the advantages of high energy density, high voltage, long cycle life, no memory effect, and environmental friendliness, and have been widely used in portable electronic devices, electric tools and other fields. With the rapid development of commercial electronic products, people put forward higher requirements on the capacity, service life and safety performance of lithium-ion secondary batteries. [0003] A lithium-ion secondary battery generally includes a positive electrode sheet, a negative electrode sheet, and a separator interposed therebetween. The diaphragm isolates the current flow between the two electrodes, but ions can pass freely. However, the current diaphra...

Claims

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Application Information

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IPC IPC(8): H01M10/38H01M4/04H01M4/62
CPCY02E60/10Y02P70/50
Inventor 姜俊刚李科刘卫平张建飞杨利贞
Owner BYD CO LTD
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