Capacitor type nickel-hydrogen power battery and preparation method thereof

Abstract

The invention belongs to the technical field of water-based power batteries, and particularly relates to a capacitive nickel-hydrogen power battery and a preparation method thereof. An electric core is formed by alternately stacking positive pole pieces, negative pole pieces and gel diaphragms and then being performed with shell installation, welding, top cover sealing, liquid injection and pulsepressure; the negative pole piece is prepared by following the steps of: dissolving lignin powder in alkali liquor at high speed, adding water-soluble polymer into alkali liquor, vacuum stirring to form solution, adding hydrogen storage alloy into solution, stirring uniformly, vacuum defoaming to obtain slurry, freeze drying to obtain precursor, performing vacuum carbonization on the precursor toprepare the negative pole piece; the alkali liquor is an aqueous solution of zinc oxide and sodium hydroxide. The method realizes the large-scale production of the positive pole sheet, negative pole sheet and gel diaphragm. The power battery has the advantages of low temperature performance and long service life. The times of charging and discharging of 1C in the SOC range of 20-80% is more than 20,000, which completely meets the requirements of electric automobiles, starting power supplies and the like; the invention also provides a preparation method thereof, which is safe in operation and green and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of water system power batteries, and in particular relates to a capacitive nickel-hydrogen power battery and a preparation method thereof. Background technique [0002] Since the beginning of the 21st century, the call for energy conservation and emission reduction has become increasingly high. The stable growth of the world economy and the sustainable development of human society also urgently require the development of new energy sources and improved energy utilization methods. Capacitive Ni-MH power batteries have broad application prospects in portable appliances, electric vehicles, hybrid electric vehicles, and starting power supplies due to their low-temperature and low-voltage resistance, appropriate power density, wide operating temperature range, and long cycle life. Therefore, the research of capacitive nickel-metal hydride power battery has become a major focus of countries developing energy-savin...

AI Technical Summary

Problems solved by technology

[0003] The positive and negative electrodes of traditional capacitive nickel-metal hydride power batteries use nickel-plated steel strips or metal foam as the current collector, KOH solution as the electrolyte, and polyolefin as the diaphragm; at low temperature and low pressure, the absolute amount of electrolyte absorbed by the diaphragm is relatively large less, the performance of the battery is limited. At -45°C, the 0.2C discharge efficiency is 40-55%, which is difficult to meet the needs of vehicle start-up and operation in high-latitude areas. On the other hand, the negative electrode material hydrogen storage alloy is a semi-insulator, conductive The resistance is very low, and there are two common ways to improve it. One is vacuum sintering of the pole piece, and the other is adding conductive agents such as nickel powder and carbon black. The hydrogen storage alloy particles in the former pole piece are bonded to each other, increasing the High conductivity, but due to the low conductivity of the material itself, the increase in rate performance is still very low. The latter cannot form a three-dimensional conductive network. While increasing the cost, the increase in rate performance is extremely limited

[0004] At present, the preparation of three-dimensional carbon is mainly based on carbon aerogel, and the related patents for the preparation of carbon aerogel are more researched from the aspects of battery materials and sound insulation. For example, Chinese patent CN 107680833A uses lignin as The basic material, using ferrite as a catalyst, is calcined at low temperature, pickled to remove impurities, and then crushed into a battery material, which is further made into an electrode. Although the specific surface area can be greatly increased to improve the capacitance and specific power, the patent is insufficient. Ferrite is not a battery material. After adding it, it needs to be pickled and produces a lot of organic sewage.

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