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Binder, composition, electrode material and preparation method thereof

A technology of binder and composition, applied in the field of batteries, can solve the problems of inability to ensure the stability of electrode structure and shedding of active materials.

Active Publication Date: 2021-07-02
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the binder used in traditional electrodes is generally combined with the active material through weak forces such as hydrogen bonds and van der Waals force. With the long-term use of the battery, not only the structural stability of the electrode cannot be guaranteed, but also the active material is easy to fall off from the electrode. risks of

Method used

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  • Binder, composition, electrode material and preparation method thereof
  • Binder, composition, electrode material and preparation method thereof
  • Binder, composition, electrode material and preparation method thereof

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preparation example Construction

[0056] The present invention also provides a kind of preparation method of described electrochemical cell electrode material, comprising:

[0057] S1, providing the composition and solvent;

[0058] S2, mixing the composition and the solvent to obtain a mixture;

[0059] S3, heating the mixture in a vacuum environment, so that the active groups on the surface of the active material particles and the epoxy groups of the electrochemical cell binder undergo an in-situ crosslinking reaction to obtain a three-dimensional network structure.

[0060] In step S1, the solvent may be water or an organic solvent.

[0061] In step S2, the first repeating unit on the binder can play a preliminary binding role, so as to initially bind the active material particles and the conductive agent together.

[0062] When the active group is an amino group, a polymer elastic film and a three-dimensional network structure can be formed in step S2. At this time, the function of step S3 is only to dry...

Embodiment 1

[0068] Using glycidyl methacrylate and hydrolyzed glycidyl methacrylate as raw materials, in anhydrous organic solvent tetrahydrofuran, in an atmosphere of argon or nitrogen gas protection, at 60 ° C, through a free radical initiator couple Azoisobisbutyronitrile (AIBN) free radicals initiate polymerization to obtain the binder shown in structural formula II, and the specific reaction formula is as follows:

[0069]

Embodiment 2

[0071] Using glycidyl methacrylate and methacrylic acid as raw materials, in anhydrous organic solvent tetrahydrofuran, oxidative polymerization of benzoyl peroxide (BPO) under the condition of 70 ° C, to obtain the binder shown in the structural formula III, The specific reaction formula is as follows:

[0072]

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Abstract

The invention provides a binder for electrochemical cells, which is a copolymer, the copolymer has a first repeating unit and a second repeating unit, the first repeating unit has a first side group, and the first side group It has a first end group, and the first end group is a polar functional group; the second repeating unit has a second side group, and the second side group has a second end group, and the second end group is epoxy base. The invention also provides a composition comprising the binder and active material particles, an electrochemical battery electrode material and a preparation method thereof. In the electrode material obtained by using the binder of the invention, the active material is not easy to fall off, and the stability of the electrode structure is high.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a binder, a composition, an electrode material and a preparation method thereof. Background technique [0002] The electrodes of an electrochemical cell are generally composed of a current collector, an active material, a conductive agent, and a binder. Good contact, as well as ensuring that the entire electrode maintains structural stability during charge and discharge cycles, thereby ensuring good electronic pathways and stable electrical performance during battery use. [0003] However, the binder used in traditional electrodes is generally combined with the active material through weak forces such as hydrogen bonds and van der Waals force. With the long-term use of the battery, not only the structural stability of the electrode cannot be guaranteed, but also the active material is easy to fall off from the electrode. risks of. Contents of the invention [0004] Based on this, it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/66
CPCH01M4/622H01M4/665H01M4/386H01M4/625H01M10/0525H01M10/054Y02E60/10
Inventor 王莉何向明赵云
Owner TSINGHUA UNIV
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