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Polyimide type lithium battery negative electrode pole piece and preparation method thereof
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A polyimide type, negative pole piece technology, used in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problem of heat resistance, poor weather resistance, low glass transition temperature of conductive adhesives, etc. problems, to achieve excellent heat resistance, reduce equipment and raw material costs
Inactive Publication Date: 2019-02-22
江西华莲欣科技有限公司
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[0005] The object of the present invention is to provide a polyimide type lithium battery negative pole piece to solve the problem of poor heat resistance and weather resistance of the traditional lithium battery negative pole piece, and the glass transition of the conductive adhesive used in the lithium battery negative pole piece. low temperature problem
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Embodiment 1
[0039] A polyimide-type lithium battery negative electrode sheet, comprising copper foil and a negative electrode material binder, in parts by mass, the negative electrode material binder comprises the following components:
[0042] The preparation method of the negative pole piece of the polyimide type lithium battery is as follows:
[0043] (1) dissolving the polyimide resin with N,N-dimethylformamide to obtain a polyimide solution;
[0044] (2) Add polyimide solution and graphitepowder successively according to the proportioning ratio, and obtain the negative electrode material adhesive after stirring;
[0045] (3) Apply the negative electrode material adhesive prepared in step (2) to the copper foil, after drying and partially crosslinking, put it in an oven at 180°C for curing for 8 hours, and obtain a polyamide with a high Tg point. Imide lithium battery negative pole piece.
Embodiment 2
[0047] A polyimide-type lithium battery negative electrode sheet, comprising copper foil and a negative electrode material binder, in parts by mass, the negative electrode material binder comprises the following components:
[0052] A polyimide-type lithium battery negative electrode sheet, comprising copper foil and a negative electrode material binder, in parts by mass, the negative electrode material binder comprises the following components:
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Abstract
The invention discloses a polyimide type lithium battery negative electrodepole piece which comprises a copper foil and a negative electrode material adhesive, and is characterized in that the negative electrode material adhesive comprises the following components in parts by mass: 18-22 parts of self-made polyimide resins and 20-60 parts of graphitepowder. The invention further discloses a preparation method of the self-made polyimide resin, and a preparation method of the polyimide type lithium battery negative electrode pole piece. According to the lithium battery negative electrode polepiece prepared by the invention, the production cost can be greatly reduced, and the produced lithium battery negative electrode pole piece is excellent in heat resistance and weather resistance and excellent in development prospects.
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