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Multifunctional water-based binder for sodium-ion battery and application of multifunctional water-based binder

A sodium-ion battery, water-based binder technology, applied in the direction of acid copolymer adhesives, adhesives, secondary batteries, etc., can solve the problems of poor battery cycle stability, low initial inventory efficiency, low bonding strength, etc. Improve cycle stability, improve the first coulomb efficiency and rate performance, and inhibit the effect of decomposition reactions

Pending Publication Date: 2021-07-30
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: the prior art binder for hard carbon negative electrodes of sodium-ion batteries is an organic system, with high cost, low bonding strength, and poor conductivity. When applied to sodium-ion batteries, the initial inventory efficiency is low and the rate performance is poor. , poor battery cycle stability and other issues

Method used

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  • Multifunctional water-based binder for sodium-ion battery and application of multifunctional water-based binder
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  • Multifunctional water-based binder for sodium-ion battery and application of multifunctional water-based binder

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preparation example Construction

[0046]The fourth object of the present invention is to provide a preparation method of the above-mentioned sodium ion battery electrode sheet, comprising the following steps: mixing the multifunctional aqueous binder and active material for the sodium ion battery to obtain a slurry, and coating the slurry Covering the current collector to obtain a coating, and then drying the coating under normal pressure and vacuum drying successively to obtain an electrode sheet for a sodium ion battery, wherein the vacuum drying temperature is 80-120°C, preferably 100°C. The multifunctional water-based binder for sodium-ion batteries of this application completes the curing reaction process during the electrode drying process. The reaction conditions are mild, and the entire process of electrode preparation also meets the requirements of green and safe production. It is easy to control, high in feasibility, and suitable for industrial scale production. .

[0047] Preferably, the normal pres...

Embodiment 1

[0056] This embodiment provides a multifunctional water-based binder for sodium-ion batteries. The preparation method is as follows: Weigh 0.5g sodium carboxymethylcellulose and 0.5g polyethylene oxide into a beaker, then measure 32.3mL to Ionized water was added into the beaker, stirred and dissolved to obtain a multifunctional water-based binder for sodium-ion batteries, which was denoted as CMC / PEO.

Embodiment 2

[0058] This embodiment provides a multifunctional water-based binder for sodium-ion batteries. The preparation method is as follows: Weigh 0.8g of sodium polyacrylate and 0.2g of polyethylene oxide into a beaker, then measure 32.3mL of deionized water and add Put it into a beaker, stir and dissolve to obtain a multifunctional water-based binder for sodium-ion batteries, which is designated as SP / PEO.

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Abstract

The invention relates to the field of sodium-ion batteries, in particular to a multifunctional water-based binder for a sodium-ion battery and application of the multifunctional water-based binder. The invention provides a multifunctional water-based binder for a sodium ion battery. The multifunctional water-based binder comprises a sodium ion water-soluble polymer and polyethylene oxide. The multifunctional water-based binder with a three-dimensional network structure is constructed through esterification reaction of the sodium ion-containing water-soluble polymer and polyethylene oxide, the multifunctional water-based binder has high mechanical performance, the binding performance of the multifunctional water-based binder can be improved, and the cycling stability of an electrode is improved. The sodium ion-containing water-soluble polymer can uniformly cover the surface of an active material to form a passivation film, so that the loss of irreversible capacity of a battery is reduced, and the first coulombic efficiency and the rate capability are improved.

Description

technical field [0001] The invention relates to the field of sodium ion batteries, in particular to a multifunctional aqueous binder for sodium ion batteries and an application thereof. Background technique [0002] Sodium ions have the advantages of abundant reserves, wide distribution, and low price, which can solve the problems of high price and limited resources of lithium-ion batteries. At the same time, Li-ion batteries have rich experience in research and development, which can be directly applied to the field of sodium-ion batteries. Therefore, Na-ion batteries are considered to be one of the most promising large-scale electrochemical energy storage systems. [0003] The performance difference of sodium-ion batteries mainly depends on the manufacturing process of the electrodes and the selected raw materials (such as active materials, conductive agents, binders, etc.). Among them, the addition amount of binder is very low, but it is an essential component in the el...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/133H01M4/1393H01M10/054C09J101/28C09J171/02C09J133/02C09J105/04
CPCH01M4/621H01M4/622H01M4/628H01M4/133H01M4/1393H01M10/054C09J101/28C09J171/02C09J133/02C09J105/04H01M2004/027C08L71/02Y02E60/10
Inventor 陆安慧夏吉利李文翠
Owner DALIAN UNIV OF TECH
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