Preparation method of negative electrode sheet of water-based capacitor battery

Abstract

The invention belongs to the technical field of power batteries and nickel-metal hydride batteries thereof, in particular to a preparing method of a water system capacitor battery negative electrode. The method comprises the steps of spraying water system glue on the surface of current collectors used by the negative electrode, spraying spherical hydrogen storage alloy on the surface directly, pre-pressing and conducting drying once, making the material soak in organic solution, conducting second drying, and rolling and pressing the product to conduct forming, welding, cutting the products horizontally and vertically to make the negative electrode, wherein, the water system glue is HPMC solution, the organic solution is NMP, graphe and PVDF mixed together. According to the preparing method of water system capacitor battery negative electrode, the spherical hydrogen storage alloy and the current collectors are densely combined, the whole electrode sheet preparation process is continuous and intelligentized. The direct coating of active materials is achieved. The slurry-coating resistance is hugely reduced, at the same time, the slurry-coating speed is increased, the produced negative electrode has a high flexibility and smoothness, can satisfy the ultrahigh current and ultrahigh power input and output requirements in the full service life cycle of the water system capacitor batteries.

Description

technical field [0001] The invention belongs to the technical field of power batteries and nickel-metal hydride batteries, and in particular relates to a method for preparing negative plates of water-based capacitor batteries. Background technique [0002] With the acceleration of urbanization, the construction of smart cities characterized by electrification is changing with each passing day. Aqueous capacitor batteries have the advantages of reasonable energy density, appropriate power density, wide operating temperature range, long cycle life, environmental protection, recyclability, and high safety. , light rail, high-speed rail, bullet train, etc. have broad application prospects. [0003] The preparation method of the negative plate of the existing power battery and its nickel-metal hydride battery is generally wet drawing, that is, hydrogen storage alloy or activated carbon is used as the main active material, HPMC, CMC, etc. are used as auxiliary thickeners, and SBR...

AI Technical Summary

Problems solved by technology

However, there are problems such as low pulping speed (only 0.5-2m / min), high drying power, difficult quality control of vacuum mixing, and high noise of dry mixing, which seriously restricts large-scale popularization and application, and it is difficult to meet the requirements of auto parts. Quality requirements

[0004] Electroplating a layer of dense sulfide layer on the surface of the substrate to prepare the negative electrode sheet of nickel-based alkaline secondary battery (patent number CN102800847 A), the discharge rate, corrosion resistance, and service life are all improved, but the deficiency of the invention patent is manifested in the production of the sheet Discontinuous, and there is high cost of electroplating sewage treatment; Ni-MH battery slurry is pre-configured with auxiliary glue (patent number CN103794798 A), and the baseband is subsequently made into a mixed emulsion with binders such as PTFE, SBR and conductive agents such as nickel powder , the surface of the base tape is sprayed in a single direction to prepare the negative electrode sheet (patent number CN 103794759 A), the flexibility and gloss of the electrode sheet are improved, and the service life is prolonged. High dry power, uneven dispersion of water-based mixed emulsion and poor permeability, resulting in uneven coverage

[0005] The preparation method of the negative electrode sheet of the existing capacitor battery is generally layered slurry coating (patent number CN 103138030 A), which has high drying power and low slurry drawing speed, and the flexibility and gloss of the electrode sheet are relatively low.

Images