Preparation method of reduced graphene oxide modified nickel-cobalt-manganese ternary positive electrode material

A nickel-cobalt-manganese ternary, cathode material technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problem of low charging and discharging efficiency of high nickel ternary materials, affecting the stability of lithium-ion batteries, materials Structural instability and other problems, to achieve excellent rate and cycle performance, unique electron transport kinetics, easy to obtain effects

Inactive Publication Date: 2021-08-31
BEIJING UNIV OF CHEM TECH
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it still has some problems to be solved urgently: first, Li + and Ni 2+ Second, the corrosion of active materials and the decomposition of electrolyte will seriously affect the charge transfer at the electrode / electrolyte interface, thereby affecting the stability of lithium-ion batteries. thirdly, with the deintercalation of lithium ions during the charge and discharge process, the structure of the material is unstable, causing collapse and destruction

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 method of reduced graphene oxide modified nickel-cobalt-manganese ternary positive electrode material
  • Preparation method of reduced graphene oxide modified nickel-cobalt-manganese ternary positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Will LiNi 0.8 co 0.1 mn 0.1 o 2 Add ethanol solution to obtain raw material dispersion, add ammonia solution to adjust to PH=9, immediately add surface modifier γ-aminopropyltriethoxysilane, the mass is 1wt% of the raw material dispersion. Stir magnetically at room temperature for half an hour, then filter with suction, and wash off excess modifier and solvent with ethanol. The graphene oxide solution consists of a mass of LiNi 0.8 co 0.1 mn 0.1 o 2 1wt% of the raw material was dissolved in ethanol and then ultrasonically treated for 4h to obtain the above-mentioned modified LiNi 0.8 co 0.1 mn 0.1 o 2 The raw materials were dissolved in 10ml of ethanol, and added dropwise to the graphene oxide solution placed on a magnetic stirring table, stirred for half an hour, suction filtered, washed, and dried in an oven at 50°C to remove the solvent to obtain graphene oxide coating modification LiNi 0.8 co 0.1 mn 0.1 o 2 . The temperature was raised to 300°C at a ...

Embodiment 2

[0027] The addition ratio of graphene oxide is increased to 2wt%, other conditions are the same as embodiment 1.

Embodiment 3

[0029] The addition ratio of graphene oxide is increased to 2wt%, other conditions are the same as embodiment 1.

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 a preparation method of a reduced graphene oxide modified nickel-cobalt-manganese ternary positive electrode material, which belongs to the technical field of lithium ion batteries. The method comprises the following steps of firstly, carrying out modification treatment on a high-nickel ternary positive electrode material (LiNi0.8Co0.1Mn0.1O2) by utilizing a silane coupling agent, so that the surface of the high-nickel ternary positive electrode material has positive charges, enabling the modified LiNi0.8Co0.1Mn0.1O2 material and a graphene oxide (GO) solution to be subjected to simple solution blending treatment, and achieiving electrostatic self-assembly, and then carrying out heat treatment reduction to obtain a structure of the reduced graphene oxide (rGO) coated high-nickel ternary positive electrode material (LiNi0.8Co0.1Mn0.1O2). The reduced graphene oxide obtained after heat treatment reduction has high electronic conductivity and stable chemical properties and contains a large number of defects, Li<+> can penetrate through the plane of graphene, and high capacity and good recyclability are provided. Through the design of the coating structure, the positive electrode material with relatively high capacity and excellent cycle performance is obtained.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a reduced graphene oxide modified nickel-cobalt-manganese ternary positive electrode material. Background technique [0002] Layered nickel-cobalt lithium manganese oxide ternary cathode material has the advantages of high capacity and low cost, and is considered to be one of the most promising cathode materials for high-energy lithium-ion batteries. But it still has some problems to be solved urgently: first, Li + and Ni 2+ Second, the corrosion of active materials and the decomposition of electrolyte will seriously affect the charge transfer at the electrode / electrolyte interface, thereby affecting the stability of lithium-ion batteries. thirdly, with the deintercalation of lithium ions during the charge and discharge process, the structure of the material is unstable, causing collapse and destruction. [0003] In order to overcome this s...

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): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525C01B32/198
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/625H01M10/0525C01B32/198Y02E60/10
Inventor 宋怀河赵东晨
Owner BEIJING UNIV OF CHEM TECH
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
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap