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Composite binder as well as preparation method and application thereof

A binder and solvent technology, applied in structural parts, active material electrodes, electrical components, etc., can solve the problems of poor cycle performance of silicon anodes, and achieve the effect of improving ionic conductivity

Active Publication Date: 2021-09-28
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when it is used as a silicon anode binder, it is not enough to buffer the huge volume expansion of the silicon anode, resulting in poor cycle performance of the silicon anode.

Method used

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  • Composite binder as well as preparation method and application thereof
  • Composite binder as well as preparation method and application thereof
  • Composite binder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0029] This embodiment provides a method for preparing a silicon negative electrode of a lithium ion battery using polyvinyl alcohol-zinc trifluorosulfonate as a composite binder, which specifically includes the following steps:

[0030] Step 1: Take 0.3 g of polyvinyl alcohol (with a molecular weight of 130,000-140,000) and dissolve it in deionized water by heating in a high-temperature water bath at 90° C., and stir for 1-2 hours to form a uniform solution.

[0031] Step two, control Zn 2+ The molar ratio of ions to hydroxyl groups in polyvinyl alcohol is 0.03, and the corresponding amount of zinc trifluorosulfonate is slowly added to the polyvinyl alcohol solution, stirred for 1 hour, and a transparent Zn 2+ Aqueous solutions of ionically coordinated polyvinyl alcohol binders.

[0032] Step 3, based on the percentage of polyvinyl alcohol in the composite binder, it is quantitatively introduced into the electrode preparation process to prepare a silicon negative electrode. ...

Embodiment 2

[0035] This embodiment provides a method for preparing a lithium-ion battery silicon negative electrode with polyvinyl alcohol-calcium acrylate as a composite binder. The specific process is the same as in Example (1), except that: Ca 2+ The molar ratio of the number of moles of ions to the hydroxyl groups in polyvinyl alcohol is 0.05:1.

Embodiment 3

[0037] This embodiment provides a method for preparing a polyvinyl alcohol-aluminum trifluoromethane carbonate as a composite binder for a silicon negative electrode of a lithium-ion battery. The specific process is the same as in Example (1), except that: Al 3+ The molar ratio of the number of moles of ions to the hydroxyl groups in polyvinyl alcohol is 0.02:1.

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Abstract

The invention provides a composite binder as well as a preparation method and application thereof. The composite binder is a polyvinyl alcohol-metal organic salt composite binder, the molar ratio of metal organic salt to hydroxyl in the polyvinyl alcohol is (0.01-0.12): 1. The invention also provides a preparation method of the composite binder. A silicon negative electrode prepared by using the composite binder disclosed by the invention has excellent cycling stability and rate capability; the composite binder is rich in raw material source, simple in technological process, free of high-temperature treatment, low in energy consumption, environmentally friendly, free of emission of three wastes and easy to realize large-scale production.

Description

technical field [0001] The invention relates to a binder, in particular to a composite binder for negative electrodes of lithium ion batteries, and belongs to the technical field of lithium ion batteries. Background technique [0002] Graphite is currently a commonly used anode material for commercial lithium-ion batteries. Due to its low specific capacity, the application of graphite anodes in high-performance vehicle power supplies and large-scale energy storage is limited. Silicon anodes, especially nano-silicon anodes, have ultra-high specific capacity (about 10 times the capacity of graphite electrodes), moderate charge and discharge voltage platforms, and abundant resources. They are new anode materials with great commercialization prospects for next-generation lithium-ion batteries. . In recent years, some silicon nanomaterials have entered commercial production and have shown good application prospects. [0003] However, silicon anode materials have some outstandin...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/134H01M4/1395H01M10/0525
CPCH01M4/622H01M4/628H01M4/134H01M4/1395H01M10/0525H01M2004/027Y02E60/10
Inventor 郑洪河王艳黄韦博王玮朱国斌衡帅曹章曲群婷
Owner SUZHOU UNIV
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