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Preparation method and use method of Li4Mn5O12 nanosheet material

A nanosheet and electrodeposition technology, which is applied in the field of preparation of Li4Mn5O12 nanosheet materials, can solve the problems of poor electrochemical performance and the like

Active Publication Date: 2020-07-17
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to avoid the deficiencies of the prior art, the present invention proposes a Li 4 mn 5 o 12 The preparation method and use method of nanosheet materials aim at the problem of poor electrochemical performance of existing electrode materials, especially manganese oxide-based electrode materials, and provide a Li with simple preparation process and excellent performance. 4 mn 5 o 12 nanosheet material

Method used

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  • Preparation method and use method of Li4Mn5O12 nanosheet material
  • Preparation method and use method of Li4Mn5O12 nanosheet material
  • Preparation method and use method of Li4Mn5O12 nanosheet material

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Effect test

Embodiment 1

[0028] Step 1, 10mmol Mn(CH 3 COO) 2 4H 2 O and 10 mmol Na 2 SO 4 Dissolve in 100mL deionized water to form the first mixed solution; use the first mixed solution as the first electrolyte, the carbon cloth as the working electrode, the Pt sheet as the counter electrode and the Ag / AgCl electrode as the reference electrode in a three-electrode system Under the constant voltage mode, the reaction was carried out in the constant voltage mode, the voltage was set to -2.0V, and the reaction time was 800s; after the reaction, Mn(OH) was generated on the carbon cloth 2 Nanosheet precursors were washed three times with deionized water and ethanol solvent, and dried in a vacuum oven at 50 °C for 5 hours, Mn(OH) 2 Nanosheet precursors can be converted into Mn 3 o 4 Nanosheets;

[0029] Step two, 150mmol Li 2 SO 4 Dissolve in 100mL deionized water to form a uniform second solution; using the second solution as the second electrolyte, there will be Mn 3 o 4 The carbon cloth of t...

Embodiment 2

[0032] Step 1, 12mmol Mn(CH 3 COO) 2 4H 2 O and 12 mmol Na 2 SO 4 Dissolve in 100mL deionized water to form the first mixed solution; use the first mixed solution as the first electrolyte, the carbon cloth as the working electrode, the Pt sheet as the counter electrode and the Ag / AgCl electrode as the reference electrode in a three-electrode system Under the constant voltage mode, the reaction was carried out in the constant voltage mode, the voltage was set to -1.9V, and the reaction time was 900s; after the reaction, Mn(OH) was generated on the carbon cloth 2 Nanosheet precursors were washed three times with deionized water and ethanol solvent, and dried in a vacuum oven at 60 °C for 5 hours, Mn(OH) 2 Nanosheet precursors can be converted into Mn 3 o 4 Nanosheets;

[0033] Step 2, 250mmol Li 2 SO 4 Dissolve in 100mL deionized water to form a uniform second solution; using the second solution as the second electrolyte, there will be Mn 3 o 4 The carbon cloth of the...

Embodiment 3

[0036] Step 1, 8mmol Mn(CH 3 COO) 2 4H 2 O and 10 mmol Na 2 SO 4 Dissolve in 100mL deionized water to form the first mixed solution; use the first mixed solution as the first electrolyte, the carbon cloth as the working electrode, the Pt sheet as the counter electrode and the Ag / AgCl electrode as the reference electrode in a three-electrode system Under the constant voltage mode, the reaction was carried out in the constant voltage mode, the voltage was set to -1.8V, and the reaction time was 1200s; after the reaction, Mn(OH) was generated on the carbon cloth 2 Nanosheet precursors were washed three times with deionized water and ethanol solvent, and dried in a vacuum oven at 60 °C for 6 hours, Mn(OH) 2 Nanosheet precursors can be converted into Mn 3 o 4 Nanosheets;

[0037] Step two, with 200mmol Li 2 SO 4 Dissolve in 100mL deionized water to form a uniform second solution; using the second solution as the second electrolyte, there will be Mn 3 o 4 The carbon cloth...

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Abstract

The invention relates to a preparation method and a use method of a Li4Mn5O12 nanosheet material, which are used for solving the technical problem of poor performance of an existing manganese oxide-based material serving as a supercapacitor electrode material. According to the technical scheme, the method comprises the steps of arranging a carbon cloth on which Mn3O4 nanosheets grow in 2M Li2SO4 electrolyte, carrying out an electrochemical oxidation reaction under a three-electrode system, and growing the Li4Mn5O12 nanosheets on the carbon cloth. According to the present invention, an asymmetric pseudocapacitor is prepared by taking a Li4Mn5O12 nanosheet electrode as a positive electrode and the commercial activated carbon as a negative electrode. An electrochemical performance test is carried out in the 2M Li2SO4 electrolyte, the voltage window of the asymmetric pseudocapacitor is as high as 2.2 V, the energy density is as high as 97.1 Wh kg <-1> when the power density is 366.7 W kg <-1>, and the specific capacitance retention rate of the asymmetric pseudocapacitor at 12000 cycles and the scanning rate of 200 mV s <-1> is 97.5%.

Description

technical field [0001] The invention belongs to the field of new energy storage and relates to a Li 4 mn 5 o 12 Preparation method and use method of nanosheet material Background technique [0002] The energy density of supercapacitors is lower than that of batteries, and their practical applications are limited. According to the theoretical calculation formula of energy density, increasing the working voltage window of electrode materials is one of the effective ways to increase the energy density of supercapacitors. According to the different energy storage mechanisms, supercapacitors are mainly divided into two types: electric double layer capacitors and pseudocapacitors, and the energy density of the latter is relatively higher. Currently widely studied pseudocapacitive materials mainly include transition metal oxides, transition metal nitrides, and transition metal sulfides. Among various pseudocapacitive materials, manganese oxide-based materials (including MnO 2...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/46B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01G11/46H01G11/86Y02E60/13
Inventor 樊慧庆赵楠
Owner NORTHWESTERN POLYTECHNICAL UNIV
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