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Three-dimensional network type aqueous binder, preparation method thereof and electrode plate

A three-dimensional network and binder technology is applied in the field of three-dimensional network water-based binders and preparation methods thereof and electrode sheets to achieve the effects of relieving failure, maintaining stable capacity and strong binding effect

Pending Publication Date: 2020-08-14
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of these solutions is that the additives are only incorporated into the binder network on one side through a chemical reaction to form a bond to enhance the bonding efficiency, and the other side does not participate in the bond formation, relying on long-chain effects and steric hindrance Attached to the binder, the binding effect on the volume expansion of the material is much smaller than the 3D network obtained by chemical bonding

Method used

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  • Three-dimensional network type aqueous binder, preparation method thereof and electrode plate
  • Three-dimensional network type aqueous binder, preparation method thereof and electrode plate
  • Three-dimensional network type aqueous binder, preparation method thereof and electrode plate

Examples

Experimental program
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Effect test

Embodiment 1

[0049] This example is used to illustrate a method for preparing a silicon carbon negative electrode sheet.

[0050] 1. Raw materials

[0051] Ingredients

[0052]

[0053]

[0054] 2. Preparation method

[0055] (1) Dry-mix conductive agent 1, conductive agent 2 and active material uniformly (revolution 25rpm) for about 0.5 hours, then add CMC and CA, keep the temperature in the stirring tank below 60°C and continue mixing (revolution 25rpm, Autorotation 1000rpm) for 30 minutes, add 50% water for pre-kneading (revolution 15rpm) for 30 minutes, continue mixing (revolution 15rpm) for 150 minutes, then add the same amount of water as before, vacuumize the tank and stir (revolution 30rpm, rotation 1500rpm) for 30 minutes, add NMP, vacuumize and continue to mix and stir (revolution 30rpm, autorotation 2800rpm) for 2 hours, finally add SBR, vacuum mix and stir at low speed (revolution 25rpm, autorotation 1000rpm), a uniform and stable black water-based slurry should be obta...

Embodiment 2

[0063] Add 10 mass parts of Super P conductive agent and 9 mass parts of CMC binder and 1 mass part of citric acid auxiliary agent to 80 mass parts of active materials (using commercially available silicon carbon materials), mix and grind until The slurry is evenly viscous. Use a small medicine spoon to apply it on the cleaned copper foil. Shake it slightly to make the thickness of the slurry coating uniform. Then lay it flat on the table to dry in the shade. Put the copper foil up and down in a vacuum oven at 150°C, dry it for 2 hours and weigh it. The weighed pole pieces need to be placed in a vacuum oven again at 80°C, dried for 12 hours and stored in a glove box for later use.

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Abstract

The invention relates to an electrode binder, and particularly discloses a three-dimensional network type aqueous binder, a preparation method thereof and an electrode plate. The three-dimensional network type aqueous binder is of a three-dimensional network type molecular structure formed by a bonding reaction between a water-based binder and citric acid (CA), and the water-based binder is carboxymethyl cellulose (CMC) and / or sodium carboxymethyl cellulose (NaCMC). According to the invention, regulation and control of the network spacing of the binder are realized by utilizing the bilateral cooperation of small molecular citric acid, so that the ligand utilization efficiency is improved, and the fixing effect of the binding network is enhanced. By improving the production process, large-scale application can be realized without increasing process steps, and electrode pulverization and shedding of silicon-carbon negative electrodes and other negative electrode materials with large volume change in the cycle process can be effectively prevented, so that the cycle performance is improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to an electrode binder, in particular to a three-dimensional network water-based binder, a preparation method thereof, and an electrode sheet. Background technique [0002] The development of electric vehicles has put forward higher requirements for the energy density of lithium-ion batteries. The commonly used graphite anode material has gradually approached its theoretical capacity (372mAh / g). In order to further improve the energy density of lithium-ion batteries, silicon with high theoretical capacity The base material has a better application prospect. [0003] However, the main reason why silicon-based materials have not been applied on a large scale is that accompanied by high specific capacity, silicon-based materials will experience large volume expansion / shrinkage during the intercalation / delithiation process, which often causes electrode pulverization. , especially for nano-silicon materials, the main cause of cyclic d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/04H01M4/13H01M4/139H01M10/0525
CPCH01M4/0404H01M4/13H01M4/139H01M4/622H01M10/0525Y02E60/10
Inventor 张诗雪
Owner 桑顿新能源科技(长沙)有限公司
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