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Tetrafluoro-borate ion crosslinking hydroxyl polymer binding agent, preparation method thereof, secondary battery and negative electrode and negative paste of secondary battery

A hydroxyl polymer, tetraborate technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, electrode current collector coatings, etc. Adhesion strength and mechanical properties improvement, the effect of excellent mechanical properties

Inactive Publication Date: 2018-08-17
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the binder can improve the stability of the battery, it is brittle and will have a negative effect on the post-processing of the electrode sheet

Method used

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  • Tetrafluoro-borate ion crosslinking hydroxyl polymer binding agent, preparation method thereof, secondary battery and negative electrode and negative paste of secondary battery
  • Tetrafluoro-borate ion crosslinking hydroxyl polymer binding agent, preparation method thereof, secondary battery and negative electrode and negative paste of secondary battery
  • Tetrafluoro-borate ion crosslinking hydroxyl polymer binding agent, preparation method thereof, secondary battery and negative electrode and negative paste of secondary battery

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Experimental program
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Effect test

Embodiment 1

[0043] First, borax and polyvinyl alcohol were dissolved in distilled water to prepare aqueous solutions with mass fractions of 1.0% and 5.0%. Then the borax aqueous solution and the polyvinyl alcohol aqueous solution were mixed, and then heated to 85° C. under the condition of stirring, and kept for 16 hours to form tetraborate ion cross-linked hydroxyl polymer adhesive A1. Wherein, the mass ratio of borax and polyvinyl alcohol is 0.01:1, wherein, the mass percentage of borax is 0.048%, and the mass percentage of polyvinyl alcohol is 4.762%.

[0044] A lithium-ion battery was assembled according to the above method using binder A1 and its electrochemical performance was tested.

Embodiment 2

[0046] The specific preparation method of the tetraborate ion crosslinked hydroxyl polymer adhesive of the present embodiment is the same as the preparation of A1, the difference is that the mass ratio of borax and polyvinyl alcohol is 0.05:1, to obtain adhesive A2, Wherein, the mass percentage of borax is 0.200%, and the mass percentage of polyvinyl alcohol is 4.000%.

[0047] A lithium-ion battery was assembled according to the above method using binder A2 and its electrochemical performance was tested.

Embodiment 3

[0049] The specific preparation method of the tetraborate ion crosslinked hydroxyl polymer adhesive of the present embodiment is the same as the preparation of A1, the difference is that the mass ratio of borax and polyvinyl alcohol is 0.1:1, to obtain adhesive A3, Wherein, the mass percentage of borax is 0.333%, and the mass percentage of polyvinyl alcohol is 3.333%.

[0050] A lithium-ion battery was assembled according to the above method using binder A3 and its electrochemical performance was tested.

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Abstract

The invention provides a tetrafluoro-borate ion crosslinking hydroxyl polymer binding agent and a preparation method thereof. A polymer with a crosslinking network structure is formed by condensationreaction of tetrafluoro-borate ions formed by hydrolysis of a boride and hydroxyl on a hydroxyl polymer. The binding agent is high in tensile strength and high in elastic modulus and can bear stress generated by volume expansion and shrinkage of a negative active material of a secondary battery, and the volume change is effectively reduced; the active material and conductive additive particles canbe effectively coated by a three-dimensional network structure of the binding agent, favorable contact of the active material and the conductive additive is ensured, and the conductivity of an electrode plate is further ensured; and a hydroxyl group on the binding agent and the active material such as silicon can form a chemical bond, so that the bonding strength of the binding agent and the active material is improved. The invention also provides secondary battery negative paste, a secondary battery negative electrode and the secondary battery which are prepared by employing the tetrafluoro-borate ion crosslinking hydroxyl polymer binding agent.

Description

technical field [0001] The invention belongs to the field of battery materials, and relates to a tetraborate ion-crosslinked hydroxyl polymer binder and a preparation method thereof, a secondary battery, a negative electrode thereof, and a negative electrode slurry. Background technique [0002] With the increasing shortage of energy and environmental pollution, lithium-ion batteries are considered to be the solution to energy conversion and storage because of their advantages such as high energy density, high specific energy, high operating voltage, small self-discharge effect, no memory effect, and environmental protection. ideal solution. Lithium-ion batteries have been widely used in portable electronic products such as smartphones, laptops, and tablets, and are gradually expanding to high-power systems and fields. However, the shortage of lithium resources will become an important factor restricting its development. The physical and chemical properties of sodium and po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/04
CPCH01M4/0404H01M4/13H01M4/622H01M4/624Y02E60/10
Inventor 宋江选张莉
Owner XI AN JIAOTONG UNIV
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