Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of nanometer sheet assembly beta-Ni(OH)2 microsphere

A technology of nanosheets and microspheres, which is applied in the field of continuous and rapid preparation of nanosheets to assemble β-Ni2 microspheres through microreactors, which can solve the problems of difficult precise control of product properties, short preparation process, large specific surface area, etc., and achieve dispersibility Good, easy to operate, large specific surface area effect

Inactive Publication Date: 2012-10-10
NANJING TECH UNIV
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the invention is to solve the traditional reactor preparation β-Ni (OH) 2 The reaction cycle is long, the product properties are not easy to control accurately, and most of them are batch processes, and a nanosheet assembly β-Ni(OH) 2 The preparation method of microspheres has a short preparation process, which is about 80 times shorter than the time required by traditional reactors. The particle size of microspheres is less than 1 μm, and the specific surface area is large. At the same time, the dispersion of the obtained product is still relatively low at high nickel ion concentration Good, avoiding the serious problem of agglomeration and increasing the yield of reactants per unit volume

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
  • Preparation method of nanometer sheet assembly beta-Ni(OH)2 microsphere
  • Preparation method of nanometer sheet assembly beta-Ni(OH)2 microsphere
  • Preparation method of nanometer sheet assembly beta-Ni(OH)2 microsphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Using nickel chloride and hydrofluoric acid as the nickel source and fluorine source, respectively, a nickel-fluorine mixed aqueous solution containing 0.06mol / L nickel ion and 0.18mol / L fluoride ion and a 0.42mol / L ammonia aqueous solution, ammonia water and nickel-fluorine aqueous solution were prepared After mixing, the pH value is 8.0, and the nickel-fluorine mixed aqueous solution and the ammonia aqueous solution are respectively transported to the microstructure mixer (Mainz Institute of Microtechnology, Germany, SIMM-V2) with a channel inner diameter of 45 μm with a constant flow pump. After staying for 5 ms Inject directly into an extension tube (Nanjing Wanqing Industrial Co., Ltd.) with an inner diameter of 1 mm immersed in a water bath at 80°C to continue the reaction, control the residence time of the material in the extension tube to 120s, and finally filter, wash and dry the resulting reaction product Samples will be obtained afterwards. X-ray diffraction (...

Embodiment 2

[0023] Using nickel chloride and hydrofluoric acid as the nickel source and fluorine source, respectively, a nickel-fluorine mixed aqueous solution containing 0.06mol / L nickel ion and 0.18mol / L fluoride ion and a 0.42mol / L ammonia aqueous solution were prepared, and the ammonia water was mixed with the nickel-fluorine aqueous solution After the pH value is 8.0, the nickel-fluorine mixed aqueous solution and the ammonia aqueous solution are respectively transported into the microstructure mixer (Mainz Institute of Microtechnology, Germany, SIMHEX) with a channel inner diameter of 40 μm by a constant flow pump, and then injected directly into the The reaction is continued in an extension tube (Nanjing Wanqing Industrial Co., Ltd.) with an inner diameter of 1mm immersed in a water bath at 80°C, and the residence time of the material in the extension tube is controlled to 90s. Finally, the resulting reaction product is filtered, washed and dried. Get the sample. X-ray diffraction c...

Embodiment 3

[0025] Using nickel chloride and hydrofluoric acid as the nickel source and fluorine source, respectively, prepare a nickel-fluorine mixed aqueous solution containing 0.5mol / L nickel ion and 1.6mol / L fluoride ion and a 3.5mol / L ammonia aqueous solution, and the ammonia water is mixed with the nickel-fluorine aqueous solution After the pH value is 7.3, the nickel-fluorine mixed aqueous solution and the ammonia aqueous solution are respectively transported to the microstructure mixer (Mainz Institute of Microtechnology, Germany, CPMM) with the channel inner diameter of 1200 μm with a constant flow pump, and then injected directly into the Continue the reaction in an extension tube (Nanjing Wanqing Industrial Co., Ltd.) with an inner diameter of 0.5mm immersed in a 70℃ water bath, and control the residence time of the material in the extension tube to 100s. Finally, the resulting reaction product is filtered, washed and dried. Get the sample. X-ray diffraction characterization sho...

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 diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a preparation method of a nanometer sheet assembly beta-Ni(OH)2 microsphere, in particular to a method for continuously and quickly preparing the nanometer sheet assembly beta-Ni(OH)2 microsphere through a micro reactor, which comprises the following specific steps of: preparing mixed aqueous solution containing a certain concentration of nickel ions and fluorine ions and a certain concentration of ammonia solution, respectively injecting the two solutions into a microstructure mixer for mixing, enabling mixed feed liquid to directly enter an extension tube for continuous reaction, leaching, washing and drying a reaction product to obtain the beta-Ni(OH)2 microsphere. The preparation method has the beneficial effects that in a manner of quickly mixing the two solutions in the micro reactor, the continuous synthesis of the beta-Ni(OH)2 microsphere is realized, the operation is simple, the preparation process is short, the time is shortened by about 80 times compared with the time required by a traditional intermittent type reactor, the grain size of the microsphere is smaller than 1 micrometer, the specific surface area is large, and the synthesized beta-Ni(OH)2 microsphere still has better dispersibility under high reactant concentration.

Description

Technical field [0001] The invention relates to a nano-sheet assembly β-Ni(OH) 2 The preparation method of microspheres, in particular, relates to a continuous and rapid preparation of nanosheets to assemble β-Ni(OH) through a microreactor 2 Microsphere method. Background technique [0002] The nickel hydroxide cathode active material has been widely used in a series of alkaline batteries such as Ni / Cd, Ni / MH, Ni / Fe, Ni / Zn batteries, and has become a research hotspot at home and abroad. According to the different crystal types of nickel hydroxide, it can be divided into α-Ni(OH) 2 And β-Ni(OH) 2 . Although, β-Ni(OH) 2 The theoretical specific capacity has no α-Ni(OH) 2 , But it has a higher tap density and a longer cycle life. Among them, the spherical β-Ni(OH) 2 It is a cathode material currently in mass production. With ordinary Ni(OH) 2 Compared with microspheres, β-Ni(OH) assembled from nanostructures 2 The microspheres are more conducive to the contact between the active ma...

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 Applications(China)
IPC IPC(8): C01G53/04
Inventor 张利雄吴良红王重庆
Owner NANJING TECH UNIV