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Polymer crosslinked binder, preparation method and application thereof

A binder and polymer technology, which is applied in the field of lithium-ion battery anode materials, can solve problems such as complex preparation process, environmental pollution, and poor mechanical properties, and achieve the effects of simple operation, improved mechanical properties, and reduced liquid absorption rate

Active Publication Date: 2017-12-15
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problems of low electrical conductivity, poor bonding performance, poor mechanical properties, complex preparation process and environmental pollution in polymer binders in the prior art, the purpose of the present invention is to provide a three-dimensional network structure and both A water-soluble bio-natural polymer derivative multifunctional polymer binder with ion-conducting properties, and its application in silicon negative electrodes of lithium-ion batteries is provided. The binder exhibits good binding properties and ion-conducting properties , can effectively alleviate the damage of the pole piece structure caused by the drastic volume change of silicon particles during the cycle process of the silicon negative electrode, and provide a stable conductive network and pole piece structure for the silicon negative electrode during the cycle process, so that the lithium battery can obtain stable cycle performance

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  • Polymer crosslinked binder, preparation method and application thereof
  • Polymer crosslinked binder, preparation method and application thereof
  • Polymer crosslinked binder, preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0066] The present embodiment provides a kind of binder of polyethylene glycol cross-linked carboxymethyl chitosan, and its preparation method comprises the following steps:

[0067] 1) Dissolve 0.15g carboxymethyl chitosan (C-Cs) in deionized water and add a 2% lithium hydroxide solution to adjust the pH value to 9-10, and configure a mass fraction of 1.5% C-Cs Cs alkaline solution.

[0068] 2) Dissolve 0.15g of double-terminal aldehyde-based polyethylene glycol (ALD-PEG-ALD) in deionized water to prepare an aqueous solution of ALD-PEG-ALD with a mass fraction of 1.5%; the number average molecular weight of ALD-PEG-ALD is 2000 .

[0069] 3) Add the prepared ALD-PEG-ALD aqueous solution to the prepared C-Cs alkali solution at a ratio of 5% (accounting for the total mass of the reaction solution), and react at 60-90 degrees Celsius for 2-5 hours.

[0070] 4) The mixed solution obtained in step 3) was ball-milled for 0.5 hours, then placed in a vacuum drying oven, and dried in...

Embodiment 2

[0112] 1) Control the addition of ALD-PEG-ALD to 3% of the total mass of the binder to prepare a modified C-Cs binder and prepare a modified binder solution, which is denoted as CP3.

[0113]2) The CP3 binder solution obtained in step 1) is configured according to the mass ratio of nano-silicon: conductive carbon black: binder = 8:1:1, and the slurry is obtained after being uniformly mixed by ball milling.

[0114] 3) Coat the slurry obtained in step 2 on a copper foil, dry it in vacuum at 60°C for 10 hours, and punch it out to obtain a circular pole piece with a diameter of 14 mm. Control the density of nano-silicon particles on the copper foil to 0.5-0.7 mg·cm by controlling the height of the coating blade -2 .

[0115] 4) Vacuum-dry the circular pole piece obtained in step 3 at 80 degrees Celsius for 10 hours to obtain the required silicon negative pole piece.

[0116] The bonding performance characterization of the binder, the battery assembly technology and the battery ...

Embodiment 3

[0121] 1) Control the addition of ALD-PEG-ALD to 7% of the total mass of the binder to prepare a modified C-Cs binder and obtain a modified binder solution, denoted as CP7.

[0122] 2) The CP7 binder solution obtained in step 1) is configured according to the mass ratio of nano-silicon: conductive carbon black: binder = 8:1:1, and the slurry is obtained after being uniformly mixed by ball milling.

[0123] 3) Coat the slurry obtained in step 2 on a copper foil, dry it in vacuum at 60°C for 10 hours, and punch it out to obtain a circular pole piece with a diameter of 14 mm. Control the density of nano-silicon particles on the copper foil to 0.5-0.7 mg·cm by controlling the height of the coating blade -2 .

[0124] 4) Vacuum-dry the circular pole piece obtained in step 3 at 80 degrees Celsius for 10 hours to obtain the required silicon negative pole piece.

[0125] It can be seen that the difference between CP3, CP5, and CP7 lies in the percentages of the crosslinking agent in...

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Abstract

The invention discloses a polymer crosslinked binder, a preparation method and application thereof. The polymer crosslinked binder is prepared by adopting double end group substituted polyethylene glycol as the crosslinking agent for crosslinking reaction with a water-soluble linear polymer binder. The invention verifies the feasibility of preparation of a three-dimensional polymer binder through crosslinking reaction. The polymer modified binder takes natural biologically modified macromolecule as the raw material, the sources are wide, the cost is low, and also the water solubility is good. The polymer reaction is carried out through Schiff base reaction, high temperature or a catalyst is unnecessary, and the implementation process is simple and feasible. Testing representation of the performance of a silicon anode prepared from the binder finds that crosslinking modification of the binder not only improves the binding performance of the binder, but also improves the ionic conductivity of the electrode, improves the electrochemical properties of the battery material, and enhances the battery comprehensive performance.

Description

technical field [0001] The invention relates to a polymer crosslinked binder and its preparation method and application, in particular to an ion-conductive crosslinked polymer water-soluble binder used for battery negative electrode materials, and belongs to the field of lithium ion battery negative electrode materials. Background technique [0002] With the popularity of portable electronic devices and electric vehicles, the performance requirements of lithium-ion batteries are also increasing. Silicon (Si) material has a high theoretical capacity of 4200mAh g -1 (much higher than the 372mAh g of the traditional anode material graphite -1 ), moderate intercalation / delithiation potential, and extensive sources (the content of silicon in the earth's crust ranks second), it is considered to be one of the most promising anode materials for lithium-ion batteries. However, during the cycle of lithium-ion batteries, silicon particles will produce huge volume changes (greater tha...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525C08L5/08C08J3/24C08B37/08
CPCC08B37/003C08J3/246C08J2305/08C08J2471/02C08L5/08C08L2312/00H01M4/622H01M10/0525C08L71/02Y02E60/10
Inventor 梁波陈栩张帅兰芳乔猛
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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