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Binder and battery containing same

A binder and polymer technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as irreversible mechanical degradation and delamination, achieve good toughness and self-healing ability, buffer deformation, and improve cycle stability Effect

Pending Publication Date: 2022-04-19
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these polymeric binders eventually undergo irreversible mechanical degradation and delamination due to the repeated extreme volume expansion and contraction of the silicon anode and the polymeric binder.

Method used

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  • Binder and battery containing same
  • Binder and battery containing same
  • Binder and battery containing same

Examples

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preparation example Construction

[0059] The present invention also provides the preparation method of above-mentioned adhesive, and described preparation method comprises the following steps:

[0060] Step 1: preparing terminal alkenyl polyurethane;

[0061] Step 2: Free radical polymerization of alkenyl-terminated polyurethane, a monomer having the chemical formula shown in Formula 1, and a monomer having the chemical formula shown in Formula 2, to obtain the second polymer;

[0062] Step 3: mixing the second polymer with the first polymer to obtain the binder.

[0063] According to an embodiment of the present invention, in step 1, the polyurethane prepolymer is prepared by reacting polyester polyol and / or polyether polyol with polyisocyanate, and then reacting with a hydroxyl-terminated double bond monomer to prepare the terminal Alkenyl polyurethane.

[0064] According to the embodiment of the present invention, Step 1 is specifically: 50-70 parts by weight of polyester polyol and / or polyether polyol, h...

Embodiment 1

[0097] The preparation method of this implementation self-healing adhesive is as follows:

[0098] (1) Add 0.1 mol (200 g) of polycaprolactone diol with a number average molecular weight of 2000 to a three-neck flask equipped with a stirrer, a spherical condenser and a constant pressure dropping funnel, and heat up to 120° C. for vacuum dehydration for 3 h. After cooling down to 40°C, add 0.15mol (25.2g) of hexamethylene diisocyanate (HDI), drop HDI into the system through a constant pressure dropping funnel, slowly raise the temperature to 80°C after the addition, add the above two monomers The 0.5% mass fraction catalyst dibutyltin dilaurate (DBTDL) of the mass summation, reaction 6h, add terminal hydroxyl double bond monomer hydroxyethyl methacrylate (HEMA) 0.1mol (13.1g) capping reaction 12h, after cooling The polycaprolactone type polyurethane prepolymer can be obtained by adding 200 g of solvent DMF to dilute and discharge the material. It can be seen from tests that its...

Embodiment 2

[0119] The self-healing adhesive preparation method of the present embodiment is as follows:

[0120] (1) Add 0.1 mol (200 g) of polycarbonate diol with a number average molecular weight of 2000 to a three-necked flask equipped with a stirrer, a spherical condenser and a constant pressure dropping funnel, heat up to 120° C. for vacuum dehydration for 3 hours, and cool down After reaching 40°C, add 0.15mol (25.2g) of hexamethylene diisocyanate (HDI), drop HDI into the system through a constant pressure dropping funnel, slowly raise the temperature to 80°C after the addition, add the total of the above two monomers 0.5% mass fraction of the mass catalyst dibutyltin dilaurate (DBTDL), react for 6h, add 0.1mol (13.1g) of hydroxyl-terminated double bond monomer hydroxyethyl methacrylate (HEMA) for capping reaction for 12h, add solvent after cooling 200g of DMF is diluted and discharged to obtain a polycarbonate polyurethane prepolymer, the number average molecular weight of which i...

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Abstract

The invention provides a binder and a battery containing the binder. The binder has a three-dimensional network structure, a skeleton of the three-dimensional network structure is formed by a first polymer, the skeletons are connected through a second polymer, and the first polymer and the second polymer are cross-linked through a hydrogen bond; wherein the first polymer is selected from an acrylic polymer; and the second polymer is selected from a polyurethane ternary polymer. The binder provided by the invention can effectively improve deformation caused by volume change of a negative electrode active material, so that the cycle life of the battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of batteries, in particular to a binder and a battery containing the binder. Background technique [0002] To meet the increasing energy density requirements for future electric energy storage and electric vehicles, various high-capacity electrode materials are being extensively developed. Among them, Si is considered to be the most promising candidate for next-generation lithium-ion batteries (LIBs) due to its high theoretical capacity, abundant natural resources, and low electrochemical potential. Nevertheless, several technical challenges still limit the commercialization of Si. The main problem with silicon anodes is the drastic volume change during deep cycling, which often leads to severe pulverization, loss of electrical contact, instability of solid electrolyte interface (SEI), and thus poor reversibility of electrochemical cycling. The solution to the problem of silicon particle swelling is to use...

Claims

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Application Information

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IPC IPC(8): H01M4/62
CPCH01M4/623H01M4/621H01M4/622Y02E60/10
Inventor 朱清雅彭冲石越李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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