Supercharge Your Innovation With Domain-Expert AI Agents!

Preparation of MnO-Cr2O3-graphene composite and application of MnO-Cr2O3-graphene composite in lithium ion battery negative electrodes

A composite material, graphene technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of capacity decay and volume expansion cannot be well improved, and achieve reduced capacity decay, excellent cycle performance, and good rate. performance effect

Inactive Publication Date: 2016-08-03
陈波
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even if the transition metal oxide nanoparticles are supported on carbon materials, the volume expansion cannot be improved very well, and the capacity fading is still obvious under high current and long cycle period.

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
  • Preparation of MnO-Cr2O3-graphene composite and application of MnO-Cr2O3-graphene composite in lithium ion battery negative electrodes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: MnO-Cr 2 O 3 - Preparation of graphene composites

[0015] A MnO-Cr 2 o 3 -The preparation method of graphene composite material, comprises the steps:

[0016] Step S1, synthesis of graphene oxide: take 0.5g of expanded graphite and 60ml of concentrated sulfuric acid and stir and mix, add 0.5g of sodium nitrate, and slowly add a mixture of 3g of potassium permanganate and potassium dichromate, stir overnight; remove the upper layer of the solution floating For unreacted expanded graphite, pour the mixed solution into 240ml triple-distilled water and stir. After the beaker is cooled, add 10ml of hydrogen peroxide with a mass fraction of 30% to obtain a bright yellow graphene oxide solution; centrifuge and wash with triple-distilled water for 4- 5 times, obtain brownish-yellow graphene oxide sol; Wherein, the ratio by weight of described potassium permanganate and potassium dichromate is 5:1;

[0017] Step S2, MnO-Cr 2 o 3 - Preparation of graphe...

Embodiment 2

[0018] Example 2: MnO-Cr 2 O 3 - Preparation of graphene composites

[0019] A MnO-Cr 2 o 3 -The preparation method of graphene composite material, comprises the steps:

[0020] Step S1, synthesis of graphene oxide: take 0.5g of expanded graphite and 60ml of concentrated sulfuric acid and stir and mix, add 0.5g of sodium nitrate, and slowly add a mixture of 3g of potassium permanganate and potassium dichromate, stir overnight; remove the upper layer of the solution floating For unreacted expanded graphite, pour the mixed solution into 240ml triple-distilled water and stir. After the beaker is cooled, add 10ml of hydrogen peroxide with a mass fraction of 30% to obtain a bright yellow graphene oxide solution; centrifuge and wash with triple-distilled water for 4- 5 times, obtain brownish-yellow graphene oxide sol; Wherein, the ratio by weight of described potassium permanganate and potassium dichromate is 4:1;

[0021] Step S2, MnO-Cr 2 o 3 - Preparation of graph...

Embodiment 3

[0022] Example 3: MnO-Cr 2 O 3 - Preparation of graphene composites

[0023] A MnO-Cr 2 o 3 -The preparation method of graphene composite material, comprises the steps:

[0024] Step S1, synthesis of graphene oxide: take 0.5g of expanded graphite and 60ml of concentrated sulfuric acid and stir and mix, add 0.5g of sodium nitrate, and slowly add a mixture of 3g of potassium permanganate and potassium dichromate, stir overnight; remove the upper layer of the solution floating For unreacted expanded graphite, pour the mixed solution into 240ml triple-distilled water and stir. After the beaker is cooled, add 10ml of hydrogen peroxide with a mass fraction of 30% to obtain a bright yellow graphene oxide solution; centrifuge and wash with triple-distilled water for 4- 5 times, obtain brownish yellow graphene oxide sol; Wherein, the ratio by weight of described potassium permanganate and potassium dichromate is 6:1;

[0025] Step S2, MnO-Cr 2 o 3 - Preparation of graph...

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 invention discloses preparation of a MnO-Cr2O3-graphene composite and application of the MnO-Cr2O3-graphene composite in lithium ion battery negative electrodes. The preparation of the composite includes the two steps of synthesis of graphene oxide and preparation of the MnO-Cr2O3-graphene composite. The composite has excellent rate capability and cycling performance and still can keep good structural stability even in cycling under large current. The advantages of the composite are possibly related to the weight ratio of potassium permanganate to potassium dichromate in the preparation method, and when the weight ratio of potassium permanganate to potassium dichromate is (4-6):1, the prepared composite has the optimum performance.

Description

technical field [0001] The invention belongs to the field of energy, relates to graphene battery materials, in particular to MnO-Cr 2 o 3 - Preparation of graphene composite material and its application in lithium-ion battery negative electrode. Background technique [0002] Manganese oxides are widely used in energy storage and conversion devices such as supercapacitors, electrode materials for lithium-ion batteries, and fuel cells due to their abundant raw materials, low price, and environmental friendliness. Among them, MnO has been widely studied as the negative electrode of lithium-ion batteries due to its stable structure and high theoretical specific capacity of 755mAh / g. However, similar to other transition metal oxides, MnO has low electronic conductivity and thus poor rate capability. At the same time, during the conversion reaction, MnO exhibits a large volume expansion, which leads to the shedding of the active material from the current collector during the ch...

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
IPC IPC(8): H01M4/36H01M4/50H01M4/62H01M10/0525
CPCH01M4/364H01M4/50H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 陈波
Owner 陈波
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com