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Method for preparing delta-MnO2 nanosheet

A nanosheet, H2O2 technology, applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of low electronic conductivity, volume change, loss of active materials, etc., and achieve the effect of simple preparation process, good dispersion and improved performance

Inactive Publication Date: 2018-07-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, MnO 2 As a negative electrode material for lithium-ion batteries, it also faces similar problems with other transition metal oxide negative electrode materials: (1) MnO 2 In the process of charging and discharging, it is prone to significant volume change
This will lead to pulverization of electrode materials, decrease in connection with each other, and increase in system resistance; or fall off from the surface of the current collector, resulting in loss of active materials, resulting in rapid decline in capacity
(2)MnO 2 The conductivity itself is poor, and the intrinsic electronic conductivity (10 -5 ~10 -6 S / cm) is low, which is not conducive to charge transfer during charge and discharge

Method used

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  • Method for preparing delta-MnO2 nanosheet
  • Method for preparing delta-MnO2 nanosheet

Examples

Experimental program
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Effect test

Embodiment 1

[0021] MnO 2 The preparation method of nano sheet, comprises the following steps:

[0022] Step 1: Dissolve 8.04g NaOH in 300mL deionized water, stir the solution for a period of time until NaOH is completely dissolved;

[0023] Step 2: Dilute 35 mL of 30% H 2 o 2 Quickly add to the solution obtained in step 1 and mix well;

[0024] Step 3: 10mL mass fraction is 50% Mn(NO 3 ) 2 Dissolve in 133mL of deionized water;

[0025] Step 4: The mixed solution obtained in step 2 is quickly added to the prepared Mn(NO 3 ) 2 In the solution, stir quickly until the mixture is uniform;

[0026] Step 5: standing the mixed solution obtained in step 4 to obtain a sediment, washing the sediment to neutrality and then drying to obtain an intermediate product;

[0027] Step 6: Add 80% of the intermediate product obtained in step 5 into a NaOH solution with a concentration of 2 mol / L, stir evenly, and then transfer to a high-pressure reactor, and the volume of the solution is controlled a...

Embodiment 2

[0030] MnO 2 The preparation method of nano sheet, comprises the following steps:

[0031] Step 1: Dissolve 12.3g NaOH in 458mL deionized water, stir the solution for a period of time until NaOH is completely dissolved;

[0032] Step 2: Dilute 47 mL of 30% H 2 o 2 Quickly add to the solution obtained in step 1 and mix well;

[0033] Step 3: 18mL mass fraction is 50% Mn(NO 3 ) 2 Dissolve in 240mL of deionized water;

[0034] Step 4: The mixed solution obtained in step 2 is quickly added to the prepared Mn(NO 3 ) 2 In the solution, stir rapidly for 30 minutes until the mixture is uniform;

[0035] Step 5: The mixed solution obtained in Step 4 is left standing, washed to neutral and then dried to obtain an intermediate product;

[0036] Step 6: Add 80% of the intermediate product obtained in step 5 into 80 mL of NaOH solution with a concentration of 2.5 mol / L, stir evenly and transfer to a high-pressure reactor, and the volume of the solution is controlled at 75% of the ...

Embodiment 3

[0039] MnO 2 The preparation method of nano sheet, comprises the following steps:

[0040] Step 1: Dissolve 9.6g NaOH in 359mL deionized water, stir the solution for a period of time until NaOH is completely dissolved;

[0041] Step 2: Dilute 41 mL of 30% H 2 o 2 Quickly add to the solution obtained in step 1 and mix well;

[0042] Step 3: 14mL mass fraction is 50% Mn(NO 3 ) 2 Dissolve in 186mL of deionized water;

[0043] Step 4: The mixed solution obtained in step 2 is quickly added to the prepared Mn(NO 3 ) 2 In the solution, stir rapidly for 30 minutes until the mixture is uniform;

[0044] Step 5: The mixed solution obtained in Step 4 is left standing, washed to neutral and then dried to obtain an intermediate product;

[0045]Step 6: Add 80% of the intermediate product obtained in step 5 into 100 mL of NaOH solution with a concentration of 2 mol / L, stir evenly and transfer to a high-pressure reactor, and the volume of the solution is controlled at 80% of the vol...

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Abstract

A method for preparing a delta-MnO2 nanosheet comprises steps as follows: a NaOH solution with the concentration being 0.4-0.8 mol / L is prepared, and a H2O2 solution with the concentration being 9.0-11.0 mol / L is prepared; a Mn(NO3)2 solution with the concentration being 0.20-0.40 mol / L is prepared; the H2O2 solution is rapidly added to the NaOH solution; the mixed solution is rapidly added to theprepared Mn(NO3)2 solution; a produced sediment is washed to be neutral and then dried, and an intermediate product is obtained; the intermediate product is added to the NaOH solution, and the mixture is stirred uniformly and transferred into a high-pressure reactor; after a reaction in the reaction kettle, cooling is performed, the obtained product is washed to be neutral with distilled water, then washed with absolute ethyl alcohol and finally dried by an oven, and the delta-MnO2 nanosheet is obtained. The obtained product has completely developed crystalline phase, high purity and good dispersity.

Description

technical field [0001] The present invention relates to MnO 2 The technical field of powder preparation, in particular to a method for preparing δ-MnO 2 nanosheet method. Background technique [0002] Transition metal oxides have become a research hotspot in current lithium battery anode materials due to their numerous options and small volume effect. MnO 2 It is an important transition metal oxide with various crystal forms such as α, β, γ, δ, ε, λ, etc. Due to their structural diversity, abundance, and environmental friendliness, they are widely used in battery materials. Compared with the negative electrode materials of other transition metal oxides, manganese dioxide has the following advantages: (1) It has a higher theoretical specific capacity (1232mAh / g) than many other transition metal oxides, which provides a great opportunity for the development of high-capacity lithium battery negative electrode materials. possible. (2)MnO 2 It has a significantly lower dis...

Claims

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Application Information

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IPC IPC(8): C01G45/02
CPCC01G45/02C01P2002/72C01P2004/03C01P2004/16C01P2004/20
Inventor 夏傲于婉茹宜珏谈国强
Owner SHAANXI UNIV OF SCI & TECH
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