Ferroferric oxide-based negative electrode binder for lithium ion battery

Abstract

The invention discloses a ferroferric oxide-based negative electrode binder for a lithium ion battery. PAM which is green, low in cost, high in viscosity and high in mechanical strength is selected as the binder. The PAM aqueous solution with high viscosity and high mechanical strength is obtained through simple dissolution and stirring. Compared with a traditional PVDF binder, PAM effectively bonds an electrode active material by means of high viscosity, and good electric contact of the electrode material is maintained. In addition, due to the excellent mechanical strength of PAM, the PAM can well bear the problems of huge volume change, electrode disintegration and crushing and the like caused by chemical changes such as lithium insertion and lithium removal in the circulation process of the Fe3O4-based negative electrode. Therefore, the integrity of the electrode structure is maintained, and the cycling stability of the electrode is further realized. Moreover, the PAM binder can also realize stable circulation under the condition of high load of the negative electrode. The stable circulation of the PAM binder on the high-load Fe3O4-based negative electrode shows that the binder has a wide prospect of further popularization and application in the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of binder application and electrochemical technology, and relates to a ferric oxide-based negative electrode binder for lithium-ion batteries. The binder is green, low-cost, water-soluble polypropylene with high viscosity and high mechanical strength amides. Background technique [0002] To meet the rapidly growing demand for renewable energy, the development of low-cost, high-safety, and high-energy-density large-scale energy storage systems has aroused intense interest. Lithium-ion batteries are considered to be the most promising energy storage devices due to their high energy density and long cycle life, and have been widely used in portable electronic devices, such as smartphones, smart wearable devices, and computers. However, to promote its large-scale application in electric vehicles and smart grids, it must meet the requirements of excellent energy density, long service life and cheap economic cost. High-ca...

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Problems solved by technology

[0004] The purpose of the present invention is for Fe 3 o 4 The huge volume change caused by lithium intercalation and delithiation during the cycle of the base and negative electrodes severely damaged the integrity of the electrode, which in turn led to the problem of poor cycle stability of the battery. Polyacrylamide (PAM) was developed as a Fe 3 o 4 Water-based binder based on the negative electrode, replacing the traditional PVDF binder

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