Lithium ion battery silicon negative electrode sheet and preparation method thereof, and lithium ion battery

A lithium-ion battery, silicon anode technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problem of shortening the cycle life of lithium-ion batteries, high energy consumption for the production of porous silicon anodes, and increasing the volume of lithium-ion batteries. It can solve the problems such as large and other problems, and achieve the effect of simple and easy preparation method, easy industrial production and good connectivity.

Inactive Publication Date: 2014-03-12
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the first aspect of the embodiment of the present invention provides a method for preparing a silicon negative pole piece of a lithium-ion battery, which is used to solve the problems of high energy consumption, process cost and difficulty in safe production of the existing porous silicon negative pole piece.
The second aspect of the embodiment of the present invention provides the lithiu

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  • Lithium ion battery silicon negative electrode sheet and preparation method thereof, and lithium ion battery

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preparation example Construction

[0035] In the first aspect, the embodiment of the present invention provides a method for preparing a silicon negative electrode sheet of a lithium ion battery, such as figure 1 shown, including the following steps:

[0036] (1) Get the silicon material, plasticizer, binding agent and conductive agent to form the solid batching component of the silicon negative electrode slurry, disperse the solid batching component in an organic solvent, stir, and make the silicon negative electrode slurry, and The plasticizer accounts for 4% to 30% of the total weight of the silicon negative electrode slurry solid ingredients;

[0037] (2) Coating the silicon negative electrode slurry on the surface of the current collector, drying and rolling, then placing the rolled pole piece in methanol or ethanol for extraction, and drying to obtain a silicon negative electrode for lithium ion batteries piece.

[0038] In the first aspect of the embodiment of the present invention, a silicon negative ...

Embodiment 1

[0066] A method for preparing a silicon negative electrode sheet of a lithium ion battery, comprising the following steps:

[0067] (1) Get silicon nanoparticle, dibutyl phthalate, polyvinylidene fluoride and acetylene black to form silicon negative electrode slurry solid batching component respectively, with 30 grams of polyvinylidene fluoride, join 1400 grams of N-2- In the methylpyrrolidone solution, stir for 4 hours, then add 180 grams of dibutyl phthalate, stir for 4 hours, then add 30 grams of acetylene black, stir for 2 hours, finally add 360 grams of silicon nanoparticles, stir for 6 hours, the stirring temperature Both are at 35°C to obtain a stable silicon negative electrode slurry;

[0068] (2) Coating the silicon negative electrode slurry on the surface of the plane copper foil, the coating weight is 5.82g / cm 2 (without copper foil), dried in an oven at 80°C, and then rolled to a thickness of 0.077mm, cut into strip-shaped pole pieces with a width of 40mm, and the...

Embodiment 2

[0076] A method for preparing a silicon negative electrode sheet of a lithium ion battery, comprising the following steps:

[0077] (1) Get silicon oxygen carbon composite material, propylene glycol adipate polyester, epoxy resin and graphite to form silicon negative electrode slurry solid batching component respectively, with 20 grams of epoxy resins, join 500 grams of N, N-dimethyl In the base formamide solution, stirred for 4 hours, then added 40 grams of propylene glycol adipate, stirred for 4 hours, then added 15 grams of graphite, stirred for 2 hours, and finally added 425 grams of silicon-oxygen-carbon composite materials, stirred for 6 hours, and the stirring temperature Both are at 40°C to obtain a stable silicon negative electrode slurry;

[0078] (2) Coating the silicon negative electrode slurry on the surface of the plane copper foil, the coating weight is 5.82g / cm 2 (without copper foil), dried in an oven at 100°C, and then rolled to a thickness of 0.077mm, cut i...

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Abstract

Embodiments of the present invention provide a lithium ion battery silicon negative electrode sheet preparation method, which comprises: taking a silicon material, a plasticizer, a binder and a conductive agent to form a silicon negative electrode slurry preparation solid component, dispersing the slurry preparation solid component in an organic solvent, and stirring to prepare a silicon negative electrode slurry, wherein the amount of the plasticizer is 4-30% of the total weight of the silicon negative electrode slurry preparation solid component; and coating the silicon negative electrode slurry onto the surface of a current collector, carrying out drying and rolling, placing the rolled negative electrode sheet in methanol or ethanol to extract, and drying to prepare the lithium ion battery silicon negative electrode sheet. According to the preparation method, the silicon negative electrode sheet with characteristics of high porosity, large pore size and porous structure can be prepared with the small amount of the plasticizer, and characteristics of simpleness, easy performing, low cost, no pollution and easy industrial production are provided. Embodiments of the present invention further provide a lithium ion battery silicon negative electrode sheet and a lithium ion battery containing the lithium ion battery silicon negative electrode sheet.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a lithium-ion battery silicon negative pole piece, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Among many energy storage technologies, lithium-ion batteries are widely used in mobile phones and notebook computers due to their advantages such as light weight, small size, high working voltage, high energy density, high output power, high charging efficiency, no memory effect, and long cycle life. and other fields have been widely used. [0003] However, at present, electronic digital products such as smart phones and tablet computers have higher and higher energy density requirements for lithium-ion batteries, and it is difficult for the commercial negative electrode material graphite to meet the energy density requirements. The theoretical gram capacity of silicon materials is 4200mAh / g, which is much higher than the theoretical gram...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M4/134H01M10/0525
CPCH01M4/134H01M4/1395H01M4/624H01M4/382H01M4/0407H01M4/621Y02E60/122Y02E60/10
Inventor 张光辉叶海林
Owner HUAWEI TECH CO LTD
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