Nano gamma hydrocarboxyl nickel/high ferrite composite material and preparing method

Abstract

The method for preparing composition material includes steps: adding divalent ferrite or trivalent iron salt and salt of doping metal to divalent nickel salt, then adding water to prepare reactive solution; adding potassium or sodium hydroxide to solution of oxidant to prepare alkali solution of oxidant; under condition of agitation and ultrasonic dispersion at 20-50 deg.C, adding alkali solution of oxidant to reactive solution obtains hydroxy nickel oxide in black colloid and deposition of ferrate admixture; mixing hydroxy nickel oxide, the said deposition, and aqueous solution of potassium hydroxide or sodium hydroxide; ultrasonic dispersion, filtering, vacuum drying obtains desired disclosed composition material. Features of the method are simple, using materials in low cost, no environmental pollution. Advantages of the composition material are high utilization efficiency, as well as higher specific energy and specific power of battery made from the composition material.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a nano-γ-nickel oxyhydroxide / ferrate composite material and a preparation method thereof. Background technique [0002] In the traditional Zn / Ni alkaline primary battery, the positive electrode is β-nickel hydroxide or β-nickel hydroxide doped with Co, Cd, Mn and other compounds as the active material, and the positive electrode is charged and discharged through electrochemical charging. The charged state produced after activation, or the nickel oxyhydroxide prepared by electrolytic method is produced as the positive electrode active material. This nickel electrode material mainly has the following five defects or deficiencies: [0003] First, β-nickel hydroxide itself is uncharged, that is, in a discharge state, and cannot form a good charge match with the zinc electrode in a charged state to form a battery that can be discharged immediately, but needs to be charged an...

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Problems solved by technology

This brings technological complexity to the manufacture of batteries, and at the same time causes a great waste of electric energy and increases the cost of electrode and battery manufacturing.

[0004] Second, the electrode composed of β-nickel hydroxide has a low discharge specific capacity after activation, the highest is only 200-230mAh / g, which is actually only about 50% of the negative electrode zinc electrode capacity of 400mAh / g. The mismatch of the positive and negative electrode capacities of the / nickel battery makes the specific energy and specific power of the manufactured zinc / nickel battery lower, which will also increase the manufacturing cost of the battery

[0005] Third, the conductivity of the electrode made of β-nickel hydroxide is poor, and the conductivity of the activated electrode active material is also poor, which affects its discharge efficiency, resulting in low discharge specific capacity of the battery and poor utilization of the active material. The efficiency is also low, and the utilization rate of the positive electrode active material of the zinc / nickel battery is generally only 35-60%.

[0006] Fourth, the conductivity of the electrode composed of β-nickel hydroxide is poor. Therefore, the high-current discharge performance of the electrode is poor, and it is difficult to meet the application needs of high-current occasions such as digital photographic equipment.

[0007] Fifth, the discharge voltage of zinc / nickel batteries assembled with positive electrodes made of pure β-nickel hydroxide is relatively low, usually only 1.6-1.7 volts, which also makes the volume specific energy, mass specific energy or volume of zinc / nickel batteries The specific power and mass specific power are low, which makes it difficult to meet the needs of modern electrical products for high-power and high-specific-energy battery products

There are at least three serious problems in the preparation of nickel oxyhydroxide by the electrolytic method disclosed in the above patent technology: first, the relative content of the nickel oxyhydroxide prepared by the electrolytic method is difficult to control, because the side reaction of oxygen evolution in the electrode cannot be avoided during the electrolysis process, The oxidation state of nickel is difficult to control, which will cause overoxidation or insufficient oxidation of nickel; second, the technical conditions of the electrolytic preparation method are relatively harsh, such as the purity requirements of raw materials and the technical requirements of equipment. The technical process itself is very complicated, the cost of production equipment and production technology is high, and it lacks practical commercial application value; third, the process of nickel oxyhydroxide prepared by electrolysis needs to consume a large amount of power resources, so the nickel oxyhydroxide material The preparation cost of the battery is high, resulting in a very high production cost of the battery, and it is difficult to realize industrial production

The nickel oxyhydroxide synthesized by the chemical oxidation method disclosed in the above-mentioned patent technology is used as the positive electrode active material of the zinc-nickel battery, especially the positive electrode material of the zinc-nickel primary battery, and its discharge voltage is all low, only 1.6-1.7 volts. The cost of raw materials for the preparation of nickel oxyhydroxide is relatively high

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