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A method for preparing Zr4+-doped delta-MnO2 nanoporous material

A nanoporous, mnso4·h2o technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as unfavorable charge transfer, low electronic conductivity, powdering of electrode materials, etc., to achieve Improved electrochemical performance, simple preparation process, and controllable process

Inactive Publication Date: 2019-01-04
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as a negative electrode material for lithium-ion batteries, δ-MnO 2 Still facing some severe problems, such as: intrinsic electronic conductivity (10 -5 ~10 -6 S / cm) is low, which is not conducive to the charge transfer during the charge and discharge process; and has a large volume effect, which easily leads to powdering of the electrode material, and the capacity decays quickly during the cycle

Method used

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  • A method for preparing Zr4+-doped delta-MnO2 nanoporous material
  • A method for preparing Zr4+-doped delta-MnO2 nanoporous material
  • A method for preparing Zr4+-doped delta-MnO2 nanoporous material

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Embodiment 1

[0020] Step 1: Weigh 0.01gMnSO 4 ·H 2 O with 0.047g KMnO 4 , Measure 30mL of deionized water, prepare a mixed solution, stir for 5min to make it evenly mixed.

[0021] Step 2: Add 0.001g of Zr(NO 3 ) 2 ·5H 2 O, stir for 5min to make it evenly mixed.

[0022] Step 3: transfer the mixed solution obtained in step 2 into a high-pressure reactor, and control the volume of the solution at 60% of the volume of the reactor.

[0023] Step 4: After the reaction kettle was reacted at 140°C for 12 hours, the temperature was lowered, and the obtained product was first washed with distilled water to neutrality, then washed with absolute ethanol, and finally dried in an oven to obtain Zr 4+ Doped δ-MnO 2 nanoporous materials.

Embodiment 2

[0025] Step 1: Weigh 0.047g MnSO 4 ·H 2 O with 0.28 g KMnO 4 , Measure 35mL of deionized water, prepare a mixed solution, stir for 5min to make it evenly mixed.

[0026] Step 2: Add 0.045g of Zr(NO 3 ) 2 ·5H 2 O, stir for 5min to make it evenly mixed.

[0027] Step 3: transfer the mixed solution obtained in step 2 into a high-pressure reactor, and control the volume of the solution at 70% of the volume of the reactor.

[0028] Step 4: After the reaction kettle was reacted at 180°C for 20 hours, cooled down, the obtained product was first washed with distilled water to neutrality, then washed with absolute ethanol, and finally dried in an oven to obtain Zr 4+ Doped δ-MnO 2 nanoporous materials.

Embodiment 3

[0030] Step 1: Weigh 0.019g MnSO 4 ·H 2 O with 0.119g KMnO 4 , Measure 37.5mL of deionized water, prepare a mixed solution, stir for 5min to make it evenly mixed.

[0031] Step 2: Add 0.023g of Zr(NO 3 ) 2 ·5H 2 O, stir for 5min to make it evenly mixed.

[0032] Step 3: transfer the mixed solution obtained in step 2 into an autoclave, and control the volume of the solution at 75% of the volume of the autoclave.

[0033] Step 4: After the reaction kettle was reacted at 120°C for 16 hours, it was cooled down, and the obtained product was first washed with distilled water to neutrality, then washed with absolute ethanol, and finally dried in an oven to obtain Zr 4+ Doped δ-MnO 2 nanoporous materials.

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Abstract

A method for preparing a Zr4+-doped delta-MnO2 nanoporous material is provided. The concentration of MnSO4*H2O is 0.002-0.008 mol / L, the concentration ratio of MnSO4*H2O to KMnO4 is 1: 2-1:10, the total volume of the mixed solution is 30-40mL, stirring for 5 min to make that mixture homogeneous; 0.0033-0.132 mmol of Zr(NO3)2*5H2O is added to the mixed solution and stirred for 5 min to make the mixture homogeneous; the obtained mixed solution is transferred to a high-pressure reaction kettle; After reaction in the reaction kettle, cooling, washing the obtained product with distilled water to neutrality, then washing with absolute ethanol, and finally drying in an oven to obtain the Zr4+-doped delta-MnO2 nanoporous material. Zr4+-doped delta-MnO2 nanosheets are prepared by a simple hydrothermal method, the preparation process is simple and the process is controllable. In addition, the product has complete crystal phase, high purity and good dispersibility.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a method for preparing Zr 4+ Doped δ-MnO 2 Methods for nanoporous materials. Background technique [0002] At present, lithium-ion batteries have been widely used in portable rechargeable electronic products, new energy vehicles, military equipment, aerospace and other fields. Transition metal oxides have become the current research hotspots of lithium battery anode materials due to their various types and higher theoretical specific capacity than C-type materials. MnO 2 It is an important transition metal oxide, which has higher theoretical specific capacity (1232mAh / g) and lower discharge platform (about 0.4V) than other transition metal oxide negative electrode materials, abundant reserves, low With the advantages of low cost and large specific surface area, it is a promising electrode material for lithium-ion batteries. MnO 2 It has various crystal forms suc...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/505H01M10/0525Y02E60/10
Inventor 夏傲于婉茹宜珏谈国强
Owner SHAANXI UNIV OF SCI & TECH
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