Nickel-hydrogen battery and preparation method for anode material

Abstract

A nickel-hydrogen battery and a production method for positive pole material of the nickel-hydrogen battery are disclosed, the method comprises the following steps of: 1) production of the positive pole, at first, the surface of spherical nickel hydroxide as positive pole active substance is covered with a gamma-CoOOH covering layer, then the spherical nickel hydroxide whose surface is covered with the gamma-CoOOH is partially oxidized, average chemical valence of the nickel after oxidization is controlled as 2.08-2.20; 2) production of the negative pole, proportion of the capacitance of the negative pole to the capacitance of the positive pole is (1.15-1.25):1; 3) assembly for the negative pole, the positive pole and membrane; 4) formation of the battery, 0.05C-0.2C of current is adopted to activate the battery for 3 to 10 weeks with charge and discharge capacitances during each week being between 30% and 100%, and the current amount of the battery at the time of discharging in the first week is discharged to zero. The positive pole uses the partially-oxidized spherical nickel hydroxide whose surface is covered with the gamma-CoOOH, when the designed capacitance proportion of the positive and negative poles is fixed, the designed capacitance of the negative pole can be reduced correspondingly, powder applying amount of the negative pole is lessened, manufacturing cost of the battery is saved, and the battery is able to maintain the characteristics of long service life and resistance to overcharge.

Description

technical field [0001] The invention relates to battery manufacturing technology, in particular to a method for preparing a positive electrode material of a nickel-hydrogen battery and a method for preparing a nickel-hydrogen battery using the positive electrode material. Background technique [0002] When designing Ni-MH batteries, it is generally ensured that the capacity of the negative electrode is excessive, so that the negative electrode can eliminate the generated O during the process of battery overcharge and overdischarge. 2 and H 2 : It ensures that when the battery is overcharged, the internal pressure of the battery will not increase due to oxygen precipitation, and the negative electrode will not be forcibly oxidized when the battery is overdischarged. The negative electrode capacity of the Ni-MH battery is the excess part except the part that matches the positive electrode capacity, and this part of the capacity is divided into two parts: the charge reserve ca...

AI Technical Summary

Problems solved by technology

[0011] Ni-MH batteries are designed in accordance with the design principles of positive electrode control capacity and negative electrode excess. In order to produce high-capacity batteries, the negative electrode excess value of the battery design is often sacrificed in exchange for a larger space to increase the filling of the positive electrode active material. The ratio of the effective capacity of the negative electrode, but at the same time, the reduction in the excess amount of the negative electrode will lead to a decrease in battery life, overcharge, etc.

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