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naxmno2 positive electrode material, preparation method and application

A positive electrode material and thermal reaction technology, applied in the field of electrochemical energy storage, can solve the problems of narrow potential window and low energy density, and achieve the effect of good bendable and foldable type, short preparation process and convenient mass production

Active Publication Date: 2018-10-12
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the current situation of narrow potential window and low energy density of the current water-based supercapacitor, the purpose of the present invention is to provide a Na with high Na content. x MnO 2 Positive electrode material, preparation method and method for constructing a water-based asymmetric supercapacitor with a 2.6V ultra-wide potential window using the positive electrode material, which has high power characteristics, excellent cycle life, 2.6V ultra-wide operating potential window, and high Energy density, low cost and good safety performance

Method used

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Embodiment 1

[0022] The first step: pretreatment of carbon cloth: treat the carbon cloth with nitric acid at 90°C for 6 hours to remove surface impurities, and store it in absolute ethanol for later use.

[0023] Step 2: Preparation of Mn on carbon cloth by cathodic electrodeposition 3 o 4 Nanowall arrays. The cathodic electrodeposition method is based on a three-electrode system, in which carbon cloth is used as the working electrode, platinum sheet is used as the counter electrode, and Ag / AgCl is used as the reference electrode. Perform constant voltage deposition at -1.8V in the middle, keep it for 20min, and get Mn(OH) 2 array of nanowalls, then placed in air to eventually form Mn 3 o 4 Nanowall arrays.

[0024] Step Three: At Mn 3 o 4 On the basis of nanowall arrays, a hydrothermal method was used to prepare Na 0.55 MnO 2 Nanowall arrays. Specifically include: the Mn 3 o 4 The nanowall array was submerged in 40 mL of 1M NaOH solution, and then transferred to a hydrothermal...

Embodiment 2

[0027] The first step: pretreatment of carbon cloth: treat the carbon cloth with nitric acid at 90°C for 6 hours to remove surface impurities, and store it in absolute ethanol for later use.

[0028] Step 2: Preparation of Mn on carbon cloth by cathodic electrodeposition 3 o 4 Nanowall arrays. The cathodic electrodeposition method is based on a three-electrode system, in which carbon cloth is used as the working electrode, platinum sheet is used as the counter electrode, and Ag / AgCl is used as the reference electrode. Perform constant voltage deposition at -1.8V in the middle, keep it for 20min, and get Mn(OH) 2 array of nanowalls, then placed in air to eventually form Mn 3 o 4 Nanowall arrays.

[0029] Step Three: At Mn 3 o4 On the basis of nanowall arrays, a hydrothermal method was used to prepare Na 0.55 MnO 2 Nanowall arrays. Specifically include: the Mn 3 o 4 The nanowall array was submerged in 40 mL of 1M NaOH solution, and then transferred to a hydrothermal k...

Embodiment 3

[0032] The first step: pretreatment of carbon cloth: treat the carbon cloth with nitric acid at 90°C for 6 hours to remove surface impurities, and store it in absolute ethanol for later use.

[0033] Step 2: Preparation of Mn on carbon cloth by cathodic electrodeposition 3 o 4 Nanowall arrays. The cathodic electrodeposition method is based on a three-electrode system, in which carbon cloth is used as the working electrode, platinum sheet is used as the counter electrode, and Ag / AgCl is used as the reference electrode. Perform constant voltage deposition at -1.8V in the middle, keep it for 20min, and get Mn(OH) 2 array of nanowalls, then placed in air to eventually form Mn 3 o 4 Nanowall arrays.

[0034] Step Three: At Mn 3 o 4 On the basis of nanowall arrays, a hydrothermal method was used to prepare Na 0.55 MnO 2 Nanowall arrays. Specifically include: the Mn 3 o 4 The nanowall array was immersed in 40mL of 1M-NaOH solution, and then transferred to a hydrothermal k...

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Abstract

The invention discloses a NaxMnO2 anode material, a preparation method and application thereof. The method comprises: hydrothermal processing is carried out on a nano-wall array formed by self assembling of Mn3O4 nanoparticles growing on a piece of carbon cloth, thereby forming a high-Na-content nano-wall array based on self assembling of Na0.55MnO2 nanosheets. The working potential window of the Na0.55MnO2 nano-wall array can be extended to 0 to 1.3V (vs. Ag / AgCl); and the specific capacity can reach 366F g<-1>. A Na0.55MnO2 / / Fe3O4@C water-system asymmetric super capacitor with a 2.6-V ultra-wide working potential window is prepared by using the Na0.55MnO2 as an anode material and a Fe3O4 nanorod array coated with carbon as a cathode. The super capacitor not only has the general characters of the common super capacitor but also has advantages of high power density and ultra long cyclic service life. Moreover, the super capacitor has a2.6-V ultra-wide working potential window and the ultra high power density (87 Wh kg<-1>).

Description

technical field [0001] The invention patent relates to Na with high Na content x MnO 2 The positive electrode material, the preparation method and the method for using the positive electrode material to construct a water system asymmetric supercapacitor with a 2.6V ultra-wide potential window belong to the technical field of electrochemical energy storage. Background technique [0002] Supercapacitor is a new type of high-efficiency secondary power supply between batteries and traditional capacitors. It has the advantages of long cycle life, high power density, safety, and environmental friendliness. Its power density is 10 to 100 times higher than that of batteries, and it can release extremely large currents instantly, so it is very suitable for electric vehicles. For example, supercapacitors can be used in conjunction with high-energy batteries such as lithium secondary batteries as electric vehicles. Using supercapacitors under high-power output conditions such as star...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/32H01G11/46H01G11/86
CPCY02E60/13
Inventor 夏晖孙硕翟腾
Owner NANJING UNIV OF SCI & TECH
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