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A kind of cobalt-aluminum hydrotalcite with one-dimensional morphology and its preparation method and electrochemical application

A technology of morphology cobalt-aluminum and hydrotalcite, applied in cobalt compounds, inorganic chemistry, chemical instruments and methods, etc., can solve the problems of no one-dimensional morphology cobalt-based LDHs report, poor electrical conductivity, etc. Dispersion uniformity, easy process effect

Inactive Publication Date: 2015-08-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The random accumulation of hexagonal sheet-like LDHs crystallites will inevitably lead to poor conductivity between crystallites
[0007] At present, there is no report on the use of cobalt-based LDHs with special morphology as anode materials for supercapacitors, let alone one-dimensional cobalt-based LDHs

Method used

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  • A kind of cobalt-aluminum hydrotalcite with one-dimensional morphology and its preparation method and electrochemical application
  • A kind of cobalt-aluminum hydrotalcite with one-dimensional morphology and its preparation method and electrochemical application
  • A kind of cobalt-aluminum hydrotalcite with one-dimensional morphology and its preparation method and electrochemical application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Step A: 4mmolCoCl 2 ·6H 2 O and 12mmolCO(NH 2 ) 2 Add to 80 mL of deionized water, stir and form a homogeneous solution. The solution was transferred into a 100mL polytetrafluoroethylene-lined reactor, and then reacted at 160°C for 1.75h. The resulting product was washed, filtered, and dried at 70°C for 8h to obtain a compound with the molecular formula Co(OH) 0.44 (CO 3 ) 0.78 0.29H 2 O (Using Japan Shimadzu ICP S-7500 elemental analyzer to analyze the metal element content of the sample) rod-shaped basic cobalt carbonate precursor.

[0043] Step B: Take 1g of basic cobalt carbonate precursor, disperse it in 100mL deionized water, and slowly add Na 2 CO 3 solution (0.4545g Na 2 CO 3 dissolved in 60mL deionized water), then slowly drop NaAlO 2 Solution (0.5860g NaAlO 2 dissolved in 100mL deionized water), and then adjusted to pH=12 with 1mol / L NaOH solution, heated to 80°C for 5h, the obtained product was washed, filtered, and dried at 70°C for 8h to obtain ...

Embodiment 2

[0045] Step A: Same as step A in Example 1.

[0046] Step B: Take 1g of basic cobalt carbonate precursor, disperse it in 100mL deionized water, and slowly add Na 2 CO 3 solution (0.4545g Na 2 CO 3 dissolved in 60mL deionized water), then slowly drop NaAlO 2 Solution (0.3516g NaAlO 2 dissolved in 100 mL of deionized water), then adjusted to pH = 11 with 1 mol / L NaOH solution, heated to 85°C for 8 hours, washed, filtered, and dried at 70°C for 8 hours to obtain one-dimensional rod-shaped CoAl-LDHs product.

Embodiment 3

[0048] Step A: Same as step A in Example 1.

[0049] Step B: Take 1g of basic cobalt carbonate precursor, disperse it in 100mL deionized water, and slowly add Na 2 CO 3 solution (0.4545g Na 2 CO 3 dissolved in 60mL deionized water), then slowly drop NaAlO 2 Solution (0.5860g NaAlO 2 Dissolve in 100mL deionized water), then adjust pH=11 with 1mol / L NaOH solution, heat to 90°C for 10h, wash the obtained product, filter, and dry at 70°C for 8h to obtain one-dimensional rod-shaped CoAl-LDHs product.

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Abstract

The invention relates to one-dimensional morphology cobalt-aluminum hydrotalcite and its preparation method and electrochemical application, and belongs to the field of preparation of inorganic nonmetal functional materials. Through solid-liquid ion exchange of a solid cobalt-containing precursor and aluminum-containing and carbonate ion-containing solutions and in-situ crystalline phase transformation, the one-dimensional morphology hydrotalcite-like compound is obtained. The preparation method improves material dispersion uniformity and reduces bulk density. The one-dimensional morphology cobalt-aluminum hydrotalcite is suitable for being used as an electric material in field of energy.

Description

Technical field: [0001] The invention relates to a cobalt-aluminum hydrotalcite with one-dimensional morphology, a preparation method thereof, and an electrochemical application in supercapacitor cathode materials, belonging to the field of inorganic functional materials. Background technique: [0002] Hydrotalcite-like materials are a typical type of anion intercalation materials. Because the main layer is composed of divalent and trivalent metal ions, it is also called layered double hydroxides (LDHs for short). The chemical composition is: [M 2+ 1-x m 3+ x (OH) 2 ] x+ A n－ x / n mH 2 O. where M 2+ ,M 3+ Represent divalent and trivalent metal ions respectively, x is the mole fraction of trivalent metal ions; A n－ Represents the interlayer anion; m is the amount of interlayer crystal water. LDHs crystals are composed of positively charged brucite-like main laminates ([M 2+ 1-x m 3+ x (OH) 2 ] x+ ) and the interlayer hydrated guest anion (A n－ x / n mH 2 O)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24C01G51/00
Inventor 吕志李子宇侯丽娜宋家庆徐向宇
Owner BEIJING UNIV OF CHEM TECH
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