Unlock instant, AI-driven research and patent intelligence for your innovation.

a li 4 mn 5 o 12 Preparation method and use method of nanosheet material

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

Active Publication Date: 2021-09-07
NORTHWESTERN POLYTECHNICAL UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • a li <sub>4</sub> mn <sub>5</sub> o <sub>12</sub> Preparation method and use method of nanosheet material
  • a li <sub>4</sub> mn <sub>5</sub> o <sub>12</sub> Preparation method and use method of nanosheet material
  • a li <sub>4</sub> mn <sub>5</sub> o <sub>12</sub> Preparation method and use method of nanosheet material

Examples

Experimental program
Comparison scheme
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; the first mixed solution is used as the first electrolyte, the carbon cloth is used as the working electrode, the Pt sheet is used as the counter electrode and the Ag / AgCl electrode is used 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 The nanosheet precursor was 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...

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; the first mixed solution is used as the first electrolyte, the carbon cloth is used as the working electrode, the Pt sheet is used as the counter electrode and the Ag / AgCl electrode is used 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 ...

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; the first mixed solution is used as the first electrolyte, the carbon cloth is used as the working electrode, the Pt sheet is used as the counter electrode and the Ag / AgCl electrode is used 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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention relates to a kind of Li 4 mn 5 o 12 The preparation method and application method of the nano sheet material are used to solve the technical problem that the existing manganese oxide-based material has poor performance as an electrode material of a supercapacitor. The technical solution is to have Mn 3 o 4 Carbon nanosheets arranged in 2M Li 2 SO 4 In the electrolyte, the electrochemical oxidation reaction is carried out under the three-electrode system, and Li 4 mn 5 o 12 Nanosheets. With Li 4 mn 5 o 12 Asymmetric pseudocapacitors were fabricated using nanosheet electrodes as positive electrodes and commercial activated carbon as negative electrodes. In 2M Li 2 SO 4 The electrochemical performance test is carried out in the electrolyte. The voltage window of the asymmetric pseudocapacitor is as high as 2.2V, and the power density is 366.7W kg ‑1 Hourly energy density up to 97.1Wh kg ‑1 , at 200mV s ‑1 Under the scanning rate, the specific capacitance retention rate of 12000 cycles 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86H01G11/46B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01G11/46H01G11/86Y02E60/13
Inventor 樊慧庆赵楠
Owner NORTHWESTERN POLYTECHNICAL UNIV