A kind of nickel hydroxide/carbon nanocomposite material doped with zinc and cobalt and its preparation method and application

Abstract

The invention relates to a zinc and cobalt-doped nickel hydroxide / carbon nano composite material which comprises a carbon material powder substrate and zinc and cobalt-doped nickel hydroxide loaded on the carbon material powder substrate, wherein the mass percent of the carbon material powder is 1wt. % to 99wt. %, and the molar ratio of nickel to zinc to cobalt is (80-98) to (1-10) to (1-10). A preparation method comprises the following steps: adding the carbon material powder and a solvent to a reactor, and carrying out ultrasonic vibration treatment to obtain a sufficiently wetted carbon material; adding nickel salt, cobalt salt and zinc salt to ultrapure water to prepare a mixed reaction solution; adding the mixed reaction solution to the sufficiently wetted carbon material, adding a strong alkali solution in a spraying way, filtering, washing and drying to obtain the zinc and cobalt-doped nickel hydroxide / carbon nano composite material. The zinc and cobalt-doped nickel hydroxide / carbon nano composite material has the advantages of high specific capacity, high-current charging and discharging performances, high high-temperature charging efficiency, simple preparation method, easiness in control of reaction process, uniform distribution of doped ions, and high uniformity of bonding of nickel hydroxide and carbon.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a nickel hydroxide / carbon nanocomposite material doped with zinc and cobalt, a preparation method and application thereof. Background technique [0002] In recent years, with the rapid development of electronic technology, the types and quantities of portable electronic products are increasing dramatically. Against the backdrop of increasingly strong demand for energy-saving and environmentally-friendly transportation around the world, electric vehicles, such as electric bicycles and electric vehicles, have developed rapidly. The development of these fields requires high-performance secondary batteries not only in quantity but also There are higher requirements for performance improvement. Emerging secondary battery applications such as hybrid electric vehicles (HEV) not only require higher and higher energy storage capabilities of secondary batteries, but also require higher an...

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Problems solved by technology

The most critical problem of the traditional method is that the feeding method of dripping lye or continuously flowing lye into the reaction solution used in the deposition process tends to make the local alkali concentration in the solution too high, resulting in the formation of undesired deposits due to too fast local deposition speed. Uniform amorphous agglomerate particles, this agglomerate needs to rely on subsequent higher temperature and longer aging process to help form β-type crystal structure

For the preparation of doped nickel hydroxide materials, the local too high alkali concentration is easy to cause uneven deposition distribution of doping elements, so doping has a stable crystal structure, improves solid-phase electronic conductivity and improves solid-state The functional properties of phase proton conductivity cannot be exerted

In order to achieve the purpose of easing the reaction between nickel ions and alkalis, the traditional method uses ammonia or ammonium salt as a complexing agent. The increase in cost also brings additional treatment requirements for production waste liquid

The nickel hydroxide formed by the traditional method needs to use higher temperature and longer time for aging reaction to help the formation of crystals, which not only complicates the process of material preparation, but also significantly increases energy consumption

The nickel hydroxide material prepared by the traditional method has the problems of large particles, poor electronic conductivity, and low solid-phase proton conductivity, which makes the actual utilization efficiency of the material low, and the high-rate charge-discharge performance is poor, which seriously restricts its use. Application in High Power Alkaline Secondary Batteries

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