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Method for preparing lithium ion battery negative electrode binder, and method for preparing lithium ion battery negative electrode material

A lithium-ion battery and negative electrode material technology, applied in the direction of electrode manufacturing, battery electrodes, electrode collector coating, etc., can solve the problems of less hydrogen bonds and low fluidity of rigid polymer binders, and achieve improved charging The effects of discharge cycle stability, high fluidity, and high rheology

Active Publication Date: 2018-12-04
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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  • Method for preparing lithium ion battery negative electrode binder, and method for preparing lithium ion battery negative electrode material
  • Method for preparing lithium ion battery negative electrode binder, and method for preparing lithium ion battery negative electrode material

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preparation example Construction

[0027] A preparation method of a lithium ion battery negative electrode binder, comprising the following steps: selecting hyperbranched PEI (polyethyleneimine), adding 3-5% mass fraction of crosslinking agent BDE (1,4-butanediol di glycidyl ether), 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 3- 5% mass fraction of the crosslinking agent BDE (1,4-butanediol diglycidyl ether), 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 cross-linking agent BDE is 3%.

[0031] The main effect that the present invention adopts PEI as binding agent is as follows:

[0032] 1) PEI itself provides a large n...

Embodiment

[0042] Firstly, 16 mL of 0.125 g / mL PEI (molecular weight: 60,000) ethanol solution was prepared, and 5% mass fraction of cross-linking agent BDE was added.

[0043] Then take out the ethanol solution containing 0.1g of PEI, grind it evenly with 0.3g of nano-silicon powder and 0.1g of acetylene black in an agate mortar, coat the copper foil to form a film, and place it in a vacuum oven at 60°C under vacuum Drying, during this period, through the ring-opening reaction of the amino group of PEI and the epoxy group of BDE, the PEI and silicon nanoparticles on the copper foil are cross-linked to form a hyperbranched network structure.

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Abstract

The invention provides a method for preparing a lithium ion battery negative electrode binder, and a method for preparing a lithium ion battery negative electrode material. The crosslinked PEI binderprepared in the invention has the advantages of high solubility in water, low toxicity, non-flammability, greenness, environmental protection, and realization of industrial production; the prepared crosslinked PEI binder has a hyperbranched network structure, and the structure can form a multidimensional strong hydrogen bond together with silicon in order to firmly wrap silicon nano-particles, andthe flexible hyperbranched PEI molecular chain can effectively buffer the stress generated by the volume expansion of silicon, and flows to the damaged surface when the volume of the silicon shrinksto afresh form a hydrogen bond in order to achieve an effective self-repairing effect; and the network structure can effectively limit the movement of silicon, improve the deformation resistance of electrodes and ensure the integrity of a negative electrode, and can effectively solve the volume effect of the silicon negative electrode, so the cycle stability of the silicon negative electrode is greatly improved, thereby the demand of electric vehicles and other large energy storage devices for high specific capacity batteries is met, and the development prospect is broad.

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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IPC IPC(8): H01M4/38H01M4/62H01M4/1395H01M4/04H01M10/0525
CPCH01M4/0404H01M4/1395H01M4/386H01M4/622H01M10/0525Y02E60/10
Inventor 陈超赵健伟陈峰程娜
Owner JIAXING UNIV
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