Preparation method of lithium ion battery negative electrode adhesive and method for preparing lithium ion battery negative electrode material

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low hydrogen bonding and low mobility of rigid polymer binders, and improve the stability of charge and discharge cycles. , the effect of high fluidity and high rheology

Active Publication Date: 2018-11-27
JIAXING UNIV
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Problems solved by technology

[0011] In order to solve the problems of less hydrogen bonds and low fluidity of rigid polymer binders, hyperbranched polymer materials can be selected as new silicon anode binders

Method used

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  • Preparation method of lithium ion battery negative electrode adhesive and method for preparing lithium ion battery negative electrode material

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preparation example Construction

[0027] A method for preparing a lithium ion battery negative electrode binder, comprising the following steps: selecting hyperbranched PEI (polyethyleneimine), adding 0.5-10% by mass fraction of a cross-linking agent glutaraldehyde, and pre-cross-linking at room temperature to obtain The lithium ion battery negative electrode binder.

[0028] A preparation method of a lithium ion battery negative electrode binder, comprising the following steps: selecting hyperbranched PEI (polyethyleneimine) to prepare a PEI ethanol solution with a concentration of 0.125g / mL, adding 0.5- 10% mass fraction of the cross-linking agent glutaraldehyde, after pre-cross-linking at room temperature for 1-10 hours, to obtain the lithium ion battery negative electrode binder.

[0029] The weight-average molecular weight of the added hyperbranched PEI is 60,000.

[0030] The mass fraction of the added crosslinking agent glutaraldehyde is 3%.

[0031] A method for preparing a negative electrode materia...

Embodiment

[0044] First prepare 50 mL of ethanol solution of hyperbranched PEI (molecular weight: 60,000) with a concentration of 0.125 g / mL, add 3% mass fraction (relative to PEI) of cross-linking agent glutaraldehyde, and pre-cross-link at room temperature for 2 hours.

[0045] Then take out the ethanol solution containing 0.1g hyperbranched PEI, then mix and grind 30min with 0.3g of nano silicon powder (particle size is 50nm) and 0.1g of acetylene black in agate mortar, then coat on copper foil to form a film Finally, put it in an oven at 60°C for vacuum drying to complete the cross-linking reaction and dry the solvent.

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Abstract

The invention provides a preparation method of a lithium ion battery negative electrode adhesive and a method for preparing the lithium ion battery negative electrode material. A cross-linked PEI (Polyetherimide) adhesive prepared according to the invention is water-soluble, low in toxicity, nonflammable, green, environment-friendly and capable of realizing industrial production, the prepared cross-linked PEI adhesive has a hyperbranched network structure, and the structure can form multi-dimensional strong hydrogen bonds with silicon, so that silica nanoparticles are firmly coated. The flexible hyperbranched PEI molecular chain is capable of effectively buffering stress generated by silicon volume expansion, and flows to the damage surface while shrinking the silicon volume to form hydrogen bonds again, and the self-repairing effect is effectively achieved; movement of the silicon can be effectively limited by the network structure, deformation resistance of the electrode is improved,the integrity of the electrode is ensured, and the volume effect problem of the silicon negative electrode can be effectively solved, so that the cycling stability of the silicon negative electrode is greatly improved, the requirements of electric vehicles and other large energy storage devices on high-specific capacity cells are further met, and the development prospects are wide.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a method for preparing a lithium ion battery negative electrode binder and a method for preparing lithium ion battery negative electrode materials. Background technique [0002] In recent years, lithium-ion batteries have been regarded by academia and industry as an ideal choice for battery systems for electric vehicles and large-scale energy storage devices. As an important part of the battery, the current commercial lithium-ion batteries mainly use graphite-based carbon-based anode materials, but its theoretical specific capacity value is only 372 mAh / g, which is far from meeting the needs of electric vehicles for high specific capacity batteries. Among many non-carbon-based negative electrode candidates, silicon has attracted great attention from the industry and academia because of its highest theoretical specific capacity value (4200 mAh / g). Although t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/1395H01M10/0525
CPCH01M4/1395H01M4/622H01M10/0525Y02E60/10
Inventor 陈峰赵健伟陈起程娜
Owner JIAXING UNIV
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