Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Lithium air battery positive electrode material, preparation method thereof and lithium air battery

A lithium-air battery and cathode material technology, applied in battery electrodes, fuel cell-type half-cells and secondary battery-type half-cells, nanotechnology for materials and surface science, etc., can solve the problem of increasing electron transport resistance, Problems such as increased battery polarization and poor conductivity of transition metal oxides can achieve the effects of improving lithium battery performance, avoiding reactions, and excellent performance

Inactive Publication Date: 2019-07-26
NANJING UNIV OF POSTS & TELECOMM
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Transition metal oxides themselves have poor conductivity, and their application in lithium-air batteries will increase electron transport resistance and eventually lead to increased battery polarization. Finding high-conductivity transition metal oxide substitutes will be a favorable way to solve this problem

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
  • Lithium air battery positive electrode material, preparation method thereof and lithium air battery
  • Lithium air battery positive electrode material, preparation method thereof and lithium air battery
  • Lithium air battery positive electrode material, preparation method thereof and lithium air battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The positive electrode material and preparation method provided in this embodiment, and the preparation method of lithium-air battery include the following steps:

[0030] 1. First, graphene oxide (GO) was prepared by the modified Hummers method. Add 7.5mg GO to 1.5ml ethanol, and ultrasonically disperse it for later use.

[0031]2. Preparation of graphene oxide loaded with ZIF-67 (referred to as ZIF-67 / GO): 300-500 mg of cobalt nitrate hexahydrate was dissolved in a mixed solution of 15-30 ml of methanol and 15-30 ml of ethanol to obtain solution A, Add the graphene oxide solution dropwise to solution A while stirring; dissolve 400-600mg 2-methylimidazole in a mixed solution of 5-10ml methanol and 5-10ml ethanol to obtain solution B; add solution B to solution A In the mixed solution with graphene oxide, stir and stand still to obtain a precipitate.

[0032] In this embodiment, 383mg Co(NO 3 ) 2 ·6H 2 O was dissolved in a mixed solution of 15ml of methanol and 15m...

Embodiment 2

[0042] The steps of the positive electrode material and preparation method and the preparation method of the lithium-air battery in this example are the same as those in Example 1, except that the heating and holding time in step 3 is 5 hours. The obtained cathode material is denoted as Co-N-rGO-5h.

[0043] For the X-ray diffraction data of the cathode material (Co-N-rGO-5h) obtained in this example, see figure 1 .

[0044] The SEM and TEM images of the cathode material (Co-N-rGO-5h) in this example are shown in figure 2 Middle (e) ~ (f). It can be seen from the electron microscope pictures that when the heating and holding time is extended to 5 hours, the carbonized skeleton of ZIF-67 partially collapses. The positive electrode material of this embodiment is a reduced graphene oxide loaded ZIF-67 derivative, and the derivative is a particle structure, and from the inside to the outside are Co nanoparticle core, CoN, Co 3 o 4 .

[0045] For the first-cycle electrochemi...

Embodiment 3

[0048] In this embodiment, the positive electrode material and preparation method, and the preparation method steps of the lithium-air battery, except that the heating and holding time in step 3 is 7 hours, other steps are the same as in embodiment 1. The obtained cathode material is denoted as Co-N-rGO-7h.

[0049] The SEM and TEM images of the cathode material (Co-N-rGO-7h) in this example are shown in figure 2 Middle (g) ~ (h). It can be seen from the electron microscope data that when the calcination time is extended to 7 hours, the carbonized skeleton of ZIF-67 basically collapses.

[0050] See image 3 Middle (i) ~ (p). It can be seen from the figure that, unlike Example 1, after the ZIF-67 carbon skeleton collapses, the Co nanoparticles agglomerate to form larger nanoparticles; it can be seen from the high-resolution transmission electron microscope that the core of the catalyst particle is also a Co nanoparticle. Particles, the outer periphery forms CoN due to the...

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

PropertyMeasurementUnit
current efficiencyaaaaaaaaaa
Login to View More

Abstract

The invention discloses a lithium air battery positive electrode material, a preparation method thereof and a lithium air battery. The positive electrode material is a reduced graphene oxide loaded ZIF-67 derivative, wherein the derivative is of a particle structure and sequentially comprises a Co nanoparticle core, CoN and Co3O4 from inside to outside, and the graphene oxide loaded with ZIF-67 isheated and preserved under an inert gas atmosphere to obtain the positive electrode material. The lithium air battery comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte, wherein the diaphragm and the electrolyte are arranged between the positive electrode and the negative electrode, the positive electrode comprises a positive active substance and a binding agent,and the positive active substance is the positive electrode material. By pyrolysis of a graphene-loaded metal organic framework (MOF) precursor, the lithium ion battery positive electrode material isprepared, the preparation method is simple and is good in repeatability, the obtained material has certain electrochemical catalytic activity, and the lithium air battery has excellent performance.

Description

technical field [0001] The invention relates to the field of positive electrode materials, preparation methods and lithium batteries, in particular to a kind of pyrolysis graphene-loaded MOF precursor to prepare lithium-air battery positive electrode materials, preparation methods and lithium-air batteries. Background technique [0002] Li-air battery (Li-O 2 ) due to its extremely high theoretical energy density (5200Wh kg -1 ) has attracted much attention and is most likely to become the power source of the new generation of electric vehicles. However, so far, the practical application of Li-air batteries still faces severe challenges, such as low Coulombic efficiency, low rate capability, and short cycle life. In order to improve the electrochemical performance of lithium-air batteries and promote their practical application, scholars at home and abroad have made great efforts in finding electrolytes, protecting lithium negative electrodes, and regulating and designing ...

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 Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90H01M12/08B82Y30/00
CPCB82Y30/00H01M4/8657H01M4/8825H01M4/90H01M4/9016H01M4/9041H01M4/9075H01M12/08H01M2004/8689Y02E60/10
Inventor 林秀婧马延文刘瑞卿杨阳李壮张婷婷
Owner NANJING UNIV OF POSTS & TELECOMM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com