A kind of preparation method of ferric oxide particles coated with nickel sulfide for iron-nickel battery

A technology of iron tetroxide and iron-nickel batteries, which is applied in nickel storage batteries, battery electrodes, alkaline storage batteries, etc., can solve the problems of limited improvement in electrochemical performance, reduced discharge capacity, and increased deposition of nickel sulfide due to high rate performance. , to achieve the effect of increasing the activation rate

Active Publication Date: 2019-08-09
HENAN NORMAL UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common beneficial additives are FeS, PbS, Bi 2 S 3 、Na 2 S and K 2 S and other sulfides and NiSO 4 or Ni(OH) 2 etc., the addition of these additives inhibits the passivation of the iron electrode to a certain extent and improves the capacity of the iron electrode, but the electrochemical performance of the iron battery cannot be improved to the greatest extent due to the simple addition of these additives
Recently, Wang et al reported in Electrochimica Acta 231 (2017) 479-486 a method of chemical oxidation precipitation to synthesize Fe 3 o 4 @NiS nanocomposite, the specific steps are to generate Fe by reacting with ferrous sulfate, hydrogen peroxide and sodium hydroxide 3 o 4 nanoparticles, and then adding thiourea and nickel chloride, the resulting NiS fine particles are deposited on the Fe 3 o 4 On the particle surface, experiments have shown that deposition of 5wt% NiS on Fe 3 o 4 Under the condition of low rate 0.15C discharge, the discharge capacity of the particles can reach up to 507mAh / g, but under the condition of 1.5C high rate, the discharge capacity can only reach 109mAh / g, 10wt% NiS Fe 3 o 4 The discharge capacity of the particles can only reach 352mAh / g at 1.5C, but the discharge capacity is significantly reduced at low magnification
The main disadvantage of this method is that the fine particles of NiS generated by chemical reactions are naturally deposited on Fe. 3 o 4 It is difficult to obtain a uniform and dense coating layer on the surface of the particles. Therefore, the improvement of its electrochemical performance is limited. To improve the high-rate performance, it is necessary to increase the deposition amount of nickel sulfide to more than 10wt%.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of ferric oxide particles coated with nickel sulfide for iron-nickel battery
  • A kind of preparation method of ferric oxide particles coated with nickel sulfide for iron-nickel battery
  • A kind of preparation method of ferric oxide particles coated with nickel sulfide for iron-nickel battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Commercial battery-grade ferroferric oxide powder is selected as the coating matrix, and the particle size is 0.3-1.5μm. Prepare 20mL 1mol / L sodium ethylxanthate (C 2 H 5 OCS 2 Na) solution and 10mL 1mol / L nickel sulfate solution, first add ethylxanthate sodium solution to 100mL reaction flask, slowly add nickel sulfate solution under stirring, the reaction temperature is room temperature, the precipitate generated by the reaction is filtered, washed and Dry to obtain 2.8g powdered nickel ethylxanthate ((C 2 H 5 OCS 2 ) 2 Ni); Weigh 1g of powdered nickel ethylxanthogenate and dissolve it in 10mL pyridine to obtain 10mL 0.1g / mL nickel ethylxanthogenate pyridine solution, according to the quality of nickel sulfide contained in nickel ethylxanthogenate and tetraoxide The mass ratio of ferroferric oxide is calculated as 2:98, weigh 14.8g ferroferric oxide powder; add 10mL 0.1g / mL ethylxanthogen nickel pyridine solution dropwise to 14.8g ferroferric oxide powder, stir and mix ...

Embodiment 2

[0023] According to the operation steps of Example 1, sodium ethylxanthate (C 2 H 5 OCS 2 Na) was changed to potassium isopropyl xanthate (C 3 H 7 OCS 2 K), nickel sulfate is changed to nickel chloride, and 3.1 g of isopropyl xanthogenate nickel ((C 3 H 7 OCS 2 ) 2 Ni); Weigh 1g nickel isopropylxanthogenate and dissolve it in 1mL pyridine to obtain 1mL 1.0g / mL ethylxanthogenate nickel pyridine solution, according to the ethylxanthogenate nickel contains the quality of nickel sulfide and ferroferric oxide The mass ratio is 4:96. Weigh 6.62g ferroferric oxide powder; add 1mL 1.0g / mL nickel pyridine ethylxanthogenate solution dropwise to 6.62g ferroferric oxide powder, stir and mix uniformly to obtain the surface The ferroferric oxide intermediate impregnated with the nickel pyridine alkyl xanthogenate solution, and then placed in a high-temperature furnace in an air atmosphere at 350 ℃ for heat treatment for 1 h to obtain ferroferric oxide particles coated with nickel sulfide. The...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
thicknessaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of a nickel sulfate coated ferriferrous oxide particle for an iron-nickel battery, and belongs to the technical field of iron-nickel battery electrode materials. The preparation method comprises the following steps: synthesizing nickel alkyl xanthate from alkyl xanthate and a water-soluble nickel salt according to a molar ratio of 2:1, dissolving the nickel alkyl xanthate in a pyridine solution to obtain a pyridine solution of the nickel alkyl xanthate, uniformly mixing the pyridine solution of the nickel alkyl xanthate with ferriferrous oxide powder, and keeping the temperature at 300-400 DEG C for 20-60 min to obtain the target product. The coating layer of the nickel sulfate coated ferriferrous oxide particle prepared in the invention is uniform and compact, the particle size of a micron-sized ferriferrous oxide particle is reduced into micro-nano or less, the surface of the particle trends to a spheroidic shape, and the nickel sulfate coated ferriferrous oxide particle p can effectively improve the activation rate, the charging efficiency, the discharge capacity, the rate performances and the cycle performances of an iron negative electrode.

Description

Technical field [0001] The invention belongs to the technical field of iron-nickel battery electrode materials, and in particular relates to a preparation method of iron-nickel battery coated ferroferric oxide particles with nickel sulfide. Background technique [0002] In recent years, as people's awareness of environmental protection has increased, clean energy such as solar energy, wind energy, and electric vehicles have developed rapidly. Therefore, as a battery system for energy storage and electric vehicles, there is an urgent need to develop a battery system with stable performance, long cycle life, high safety performance, low price and environmental friendliness. In recent years, iron-nickel batteries have re-entered people’s vision and attracted great attention. The iron-nickel batteries were invented by Edison in 1900. They are characterized by long cycle life, high safety, low price and environmental protection. Used for locomotive traction power. However, due to th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/58H01M10/30
CPCY02E60/10
Inventor 常焜汤宏伟张彩霞李苞上官恩波常照荣
Owner HENAN NORMAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products