Lithium-ion batteries have the advantages of high capacity, high voltage, small size, and light weight. They are widely used in electronic products such as mobile phones, notebook computers, and video cameras, and have become one of the main energy sources for communication electronic products. With the continuous expansion of the application fields of lithium-ion batteries, people have more and more requirements for their cycle life, and carbomer resin as an additive can improve the recycling performance of the battery.
Factors that affect the cycle life of lithium-ion batteries include many aspects, such as the selection of electrode active materials and inactive ingredients used, and the bonding strength of the coating. In the electrode, the main function of the binder is to bond the electrode active material to the current collector. The requirement for the binder is small ohmic resistance, stable performance in the electrolyte, no expansion, no looseness, and no powder removal. Generally speaking, the properties of the adhesive, such as adhesion, flexibility, alkali resistance, and hydrophilicity, directly affect the performance of the battery.
At present, polyvinylidene fluoride (PVDF) is generally used as a binder for lithium-ion batteries in industrial production. However, the pole pieces made of PVDF have poor flexibility, swell easily in the electrolyte, and are expensive. Therefore, high-performance electrode binders have become an important research direction of key materials for lithium-ion batteries. Kim et al. used styrene-butadiene rubber (SBR) as a binder and sodium carboxymethyl cellulose (CMC) as a thickener, and found that the binder was unevenly dispersed in the electrode sheet, and the CMC adhesion performance was poor. Trace amounts of residual moisture will have a serious impact on battery performance.
Left: Carbomer resin from other manufacturers. Right: Desun Carbomer resin
Cross-linked acrylic resin (carbomer resin) is a high molecular polymer of acrylic acid bonded allyl sucrose or pentaerythritol allyl ether, which has high adhesion. It has been reported in the literature that carbomer resin used in lithium-ion batteries can improve battery cycle performance. For this reason, some experts have studied and investigated the peeling strength of the pole piece, the stability of the electrolyte, the polarization of the battery, and the electrode after adding pure carbomer resin, pure PVDF and the 1:1 combination of the two in the positive electrode of the lithium ion battery. The influence of surface passivation film and electric double layer on impedance and cycle performance.
The results of the study found that by adding different proportions of carbomer resin to the lithium ion battery, the porosity of the pole piece is higher after the kaohm resin is added to the positive electrode, the peeling strength between the pole piece dressing and the electrode fluid increases, and the adhesion performance is significant After the pole piece is soaked in the electrolyte, the force between the pole piece dressing and the electrode fluid is not destroyed by the electrolyte. As the carbomer resin content in the positive electrode is gradually added, the polarization of the battery is improved. The impedance of the passivation film and the electric double layer on the battery electrode surface of the carbomer resin is significantly reduced, and the cycle performance of the battery is improved.
As a professional carbomer manufacturer, Desheng has professional advantages in independent research and development and synthesis. It can provide customers with free samples of carbomer 980 and carbomer 940. Its cost-effectiveness and high quality have been widely recognized by customers.
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