Capacitive nickel-hydrogen power battery and preparation method thereof

Abstract

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. The electric core is made by alternately stacking the positive electrode sheet, the negative electrode sheet and the gel diaphragm, and then made by shelling, welding, top cover sealing, liquid injection, and pulse pressure; the negative electrode sheet is: the lignin powder is dispersed and dissolved in alkali at high speed Then add water-soluble polymer to the lye, stir in vacuum to form a solution, then add a hydrogen storage alloy into the solution, stir evenly, vacuum defoam into a slurry, freeze-dry to obtain a precursor, and then vacuum carbonize the precursor Make a negative electrode sheet; the lye is an aqueous solution of zinc oxide and sodium hydroxide. The invention realizes the large-scale manufacture of the positive and negative electrode sheets and the gel diaphragm, and has the advantages of low temperature performance and long life. In the range of 20-80% SOC, 1C charging and discharging times are greater than 20,000 times, fully meeting the needs of electric vehicles, starting power supplies, etc. ; The present invention also provides its preparation method, which is safe in operation and environmentally 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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