Method for preparing silver-doped nano nickel hydroxide anode material

Abstract

The invention discloses a method for preparing a silver-doped nano nickel hydroxide anode material, which comprises the following steps of: A, preparing mixed aqueous solution of nickel salt, aluminum salt and silver salt at a certain concentration, and preparing solution of alkali precipitator at a certain concentration; B, dripping the solution of alkali precipitator into the reaction solution containing nickel, aluminum and silver ions under the conditions of stirring and ultrasonic dispersion, controlling the reaction temperature and the pH value of the system, stopping stirring after thealkali precipitator is completely dripped, and continuing the ultrasonic dispersion for a period of time to obtain silver-doped nano alpha-nickel hydroxide precipitate; and C, obtaining the silver-doped nano alpha-nickel hydroxide precipitate by filtering, washing and drying the obtained silver-doped nano alpha-nickel hydroxide precipitate. The method is convenient to operate and environmental-friendly; and the silver-doped nano alpha-nickel hydroxide used as the anode material of an electrode has high use efficiency and a long service life, can discharge large-power large current and is particularly suitable to be used as the anode material for manufacturing power batteries.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for chemical power sources, in particular to a method for preparing silver-doped nano-α-nickel hydroxide. The silver-doped nanometer α-nickel hydroxide of the present invention can be used as the positive electrode active material of Ni / Zn, Ni / MH and Ni / Fe and other green and environment-friendly secondary nickel-based alkaline batteries, especially nickel-based alkaline power batteries. Background technique [0002] Common secondary nickel-based alkaline batteries such as Ni / Zn, Ni / MH and Ni / Fe, the positive electrode materials are nickel hydroxide with β-crystal structure or compounds doped with Co, Cd, Mn and other elements The spherical β-nickel hydroxide is used as the active material. These nickel electrode active materials mainly have the following deficiencies: [0003] First, spherical β-nickel hydroxide is a semiconductor with very poor conductivity. The battery el...

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Problems solved by technology

[0005] Third, use spherical β-Ni(OH) 2 The nickel positive electrode produced is prone to overcharging during the charge-discharge cycle, resulting in expansion and deformation of the electrode, thereby shortening the cycle life of the battery

[0006] Fourth, use spherical β-Ni(OH) 2 The oxygen evolution overpotential of the manufactured electrode is relatively low, and the positive electrode is easier to precipitate oxygen during the charging process, thereby reducing the charging efficiency of the battery, and at the same time causing the battery to swell, resulting in battery deformation, shortened service life, and even excessive gas may be generated Cause battery explosion and cause safety problems

But above-mentioned patent application has its own defect except that most of them exist, and they also have common deficiency: the first, the prepared α-nickel hydroxide density is less, thereby influences the volume discharge specific energy and the discharge ratio of battery Power, it is difficult to meet the requirements of high specific energy and high specific power required by power batteries; second, the content of doping elements and the amount of doped impurities in the disclosed technology are difficult to control, because the synthesis process steps and flow The equipment and equipment are relatively complex and demanding, which leads to many uncertain factors such as the type and content of impurity elements in the actual synthesis process, making it difficult to achieve large-scale industrial production; third, the inactive impurities not only reduce the concentration of active substances The actual capacity will directly reduce the discharge specific capacity of the electrode, thereby affecting the charge and discharge performance of the battery; fourth, the discharge capacity of the electrode manufactured by using the α-nickel hydroxide prepared by the disclosed technology as the positive electrode active material is low, and the highest specific capacity The capacity value is 340mAh / g (Example 1 in patent application 01129615.1), which is only about 59% of the theoretical mass specific capacity of α-nickel hydroxide electrode 578mAh / g

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