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A method for synthesizing large interlayer spacing cobalt manganese layered double hydroxides in one step

A layered bimetallic, hydroxide technology, applied in chemical instruments and methods, cobalt compounds, inorganic chemistry, etc., can solve the problems of high energy consumption and complex process, and achieve low energy consumption, simple preparation process, and production environment. friendly effect

Active Publication Date: 2018-06-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The whole process is complex and energy-consuming

Method used

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  • A method for synthesizing large interlayer spacing cobalt manganese layered double hydroxides in one step
  • A method for synthesizing large interlayer spacing cobalt manganese layered double hydroxides in one step
  • A method for synthesizing large interlayer spacing cobalt manganese layered double hydroxides in one step

Examples

Experimental program
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Effect test

Embodiment 1

[0016] (1) Put sodium dodecylbenzenesulfonate (0.697g, 2mmol) and 200mL deionized water in a beaker, mix and stir evenly at room temperature, (2) add CoCl 2 ·6H 2 O (0.595g, 2.5mmol), MnCl 2 4H 2 O (0.247g, 1.25mmol) and NH 4 NO 3 (1.601g, 20mmol) was added to the solution of step (1), stirred and mixed, (3) NaOH (0.275g, 6.875mmol) was added to the solution of step (2), stirred for 2h, (4) the step (3) After the obtained slurry is separated by a centrifuge, it is washed with deionized water to neutrality, dried and ground to obtain the cobalt-manganese layered double metal hydroxide target material with a large interlayer spacing. X-ray diffraction (XRD) was used to characterize the results as figure 1 As shown, the measured interlayer spacings are 0.820 nm and 0.712 nm.

Embodiment 2

[0018] (1) Put sodium dodecylbenzenesulfonate (0.697g, 2mmol) and 200mL deionized water in a beaker, mix and stir evenly at room temperature, (2) add CoCl 2 ·6H 2 O (0.595g, 2.5mmol), MnCl 2 4H 2 O (0.247g, 1.25mmol) and NH 4 NO 3 (1.601g, 20mmol) was added to the solution of step (1), stirred and mixed, (3) NaOH (0.275g, 6.875mmol) was added to the solution of step (2), stirred for 48h, (4) the step ( 3) After the obtained slurry is separated by a centrifuge, it is washed with deionized water to neutrality, dried, and ground to prepare the cobalt-manganese layered double metal hydroxide target material with a large interlayer spacing. X-ray diffraction (XRD) was used to characterize the results as figure 2 As shown, the measured interlayer spacing is 0.820 nm.

Embodiment 3

[0020] (1) Put ammonium lauryl sulfate (0.567g, 2mmol) and 200mL deionized water in a beaker, mix and stir evenly at room temperature, (2) add CoCl 2 ·6H 2 O (0.595g, 2.5mmol), MnCl 2 4H 2 O (0.247g, 1.25mmol) and NH 4 NO 3 (1.601g, 20mmol) was added to the solution of step (1), stirred and mixed; (3) NaOH (0.275g, 6.875mmol) was added to the solution of step (2), stirred for 48h, (4) the step ( 3) After the obtained slurry is separated by a centrifuge, it is washed with deionized water to neutrality, dried, and ground to prepare the cobalt-manganese layered double metal hydroxide target material with a large interlayer spacing. X-ray diffraction (XRD) was used to characterize the results as image 3 As shown, the measured interlayer spacing is 1.52 nm.

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Abstract

The invention relates to the technical field of inorganic material preparation. A method for one-step compounding of cobalt manganese laminated double-metal hydroxide at a large interlayer interval comprises the following steps: (1) putting anionic surfactant and deionized water into a beaker, uniformly mixing and stirring under room temperature, wherein the concentration of the anionic surfactant is 0.01-0.3mol / L; (2) adding soluble divalent manganese salt, divalent cobalt salt and alkali buffering matter at the ratio of 1:(1-5):(5-18) into the solution obtained in the step (1), mixing and stirring; (3) adding the strong alkali matter into the solution obtained in the step (2) and stirring for 2-48h, wherein the mole ratio of strong alkali matter to alkali buffering matter is 1:(1-10); (4) adopting a centrifugal machine for separating the slurry acquired in the step (3), washing with deionized water till being neutral, drying and grinding, thereby obtaining a target material of the cobalt manganese laminated double-metal hydroxide at the large interlayer interval. According to the invention, the multiple-step interlayer anion replacement process is not required, no oxidizing agent or oxygen is blown in the preparation process, the energy consumption is low, the preparation technology is simple, the repeatability is excellent, the production environment is friendly and the application prospect is wide.

Description

technical field [0001] The invention relates to a method for synthesizing cobalt-manganese layered double metal hydroxide with large interlayer spacing in one step, and belongs to the technical field of inorganic material preparation. Background technique [0002] Layered double hydroxides (layered double hydroxides, LDH) are layered inorganic compounds composed of positively charged laminate hosts and interlayer anionic guests. Due to its unique structure and physicochemical properties, it is widely used in energy materials such as lithium-ion batteries, fuel cells, supercapacitors and electrolyzed water. Among them, stripping LDH to expose more active sites, thereby improving the electrochemical activity of the material, has an attractive prospect. The premise of exfoliation is to prepare LDH precursor with large interlayer spacing. The general method is to first replace the LDH whose interlayer anion is carbonate with chloride ion, and then further replace with nitrate....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/00
CPCC01G51/00C01P2002/72C01P2006/90
Inventor 邱介山于畅刘志斌韩晓彤黄华伟杨卷赵昌泰
Owner DALIAN UNIV OF TECH