Supercharge Your Innovation With Domain-Expert AI Agents!

Preparation method of single-layer flaky lithium-rich manganese-based positive electrode material of graphene template

A lithium-rich manganese-based, positive electrode material technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as poor cycle stability and rate performance, damage to the surface lattice structure of materials, and low initial Coulombic efficiency , achieving good rate performance, maintaining stability, and simple method

Active Publication Date: 2018-05-22
HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current lithium-rich manganese-based cathode materials are excessively charged and delithiated for the first time, which will lead to damage to the surface lattice structure of the material, low first-time Coulombic efficiency, and poor cycle stability and rate performance.

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 single-layer flaky lithium-rich manganese-based positive electrode material of graphene template
  • Preparation method of single-layer flaky lithium-rich manganese-based positive electrode material of graphene template
  • Preparation method of single-layer flaky lithium-rich manganese-based positive electrode material of graphene template

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation formula is 0.5Li 2 MnO 3· 0.5LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Graphene-templated single-layer flake lithium-rich manganese-based cathode materials

[0029] (1) Weigh 15.30g of lithium acetate dihydrate, 16.30g of manganese acetate tetrahydrate, 4.11g of cobalt acetate tetrahydrate, and 4.11g of nickel acetate tetrahydrate and mix them, add 200ml of deionized water, stir well to dissolve, and make mixed salt solution;

[0030] (2) Dissolve 5mg of graphene in 100ml of deionized water, ultrasonically disperse it evenly, add 10.5g of citric acid monohydrate, and continue ultrasonically to dissolve;

[0031] (3) Slowly add the mixed salt solution in step (1) dropwise to the solution in step (2) and stir thoroughly, and add ammonia water to adjust the pH value of the material to 8 to obtain a sol;

[0032] (4) Put the sol in a water bath, heat and stir at 100°C until the solution becomes gelatinous;

[0033] (5) Put the gel into a freeze dryer for freeze-dry...

Embodiment 2

[0038] The preparation formula is 0.5Li 2 MnO 3· 0.5LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Graphene-templated single-layer flake lithium-rich manganese-based cathode materials

[0039] (1) Weigh 15.30g of lithium acetate dihydrate, 16.30g of manganese acetate tetrahydrate, 4.11g of cobalt acetate tetrahydrate, and 4.11g of nickel acetate tetrahydrate, and mix them, add 100ml of deionized water, stir well to dissolve, and make mixed salt solution;

[0040] (2) Dissolve 10mg of expanded graphite in 100ml of deionized water, disperse it evenly with ultrasound, add 9g of glucose, and continue to dissolve it with ultrasound;

[0041] (3) Slowly add the mixed salt solution of step (1) dropwise into the solution of step (2), stir well, and add ammonia water to adjust the pH value of the material to 7 to obtain a sol;

[0042] (4) Put the sol in a water bath, heat and stir at 100°C until the solution becomes gelatinous;

[0043] (5) Put the gel into a freeze dryer for freeze-drying until ...

Embodiment 3

[0047] The preparation formula is 0.5Li 2 MnO 3· 0.5LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Graphene-templated single-layer flake lithium-rich manganese-based cathode materials

[0048] (1) Weigh 15.30g of lithium acetate dihydrate, 16.30g of manganese acetate tetrahydrate, 4.11g of cobalt acetate tetrahydrate, and 4.11g of nickel acetate tetrahydrate, and mix them, add 100ml of deionized water, stir well to dissolve, and make mixed salt solution;

[0049] (2) Dissolve 5mg of graphene in 100ml of deionized water, ultrasonically disperse it evenly, add 10.5g of citric acid monohydrate, and continue ultrasonically to dissolve;

[0050] (3) Slowly add the mixed salt solution in step (1) dropwise to the solution prepared in step (2), stir well, add ammonia water to adjust the pH value of the material to 8.5, and obtain a sol;

[0051] (4) Put the sol in a water bath, heat and stir at 110°C until the solution becomes gel;

[0052] (5) Put the gel into a freeze dryer for freeze-drying un...

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 single-layer flaky lithium-rich manganese-based positive electrode material of a graphene template and belongs to the technical field of lithium-ion batteries. The preparation method comprises the steps of adding the template into deionized water for dispersing evenly; adding a chelating agent for dissolving, and then slowly adding a mixed salt solution of a lithium salt, a nickel salt, a cobalt salt and a manganese salt; adding ammonia water to adjust the pH, carrying out heating and stirring in water bath until a solution is in a gel form andcarrying out freeze drying until gel is dehydrated; and putting the frozen and dried powder into a muffle furnace for burning according to a certain sintering curve to obtain the single-layer flaky lithium-rich manganese-based positive electrode material of the graphene template. The single-layer flaky lithium-rich manganese-based positive electrode material of the graphene template is prepared by adopting a sol-gel freezing method, a button battery assembled by the material has the capacity of 258mAh / g at the rate of 0.1C and the cycle performance is good.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a graphene template single-layer flake lithium-rich manganese-based positive electrode material. Background technique [0002] In today's increasingly important new energy technology and application, lithium-ion batteries have been widely concerned and applied due to their high energy density and potential. At present, lithium-ion batteries have become the first choice for the power supply of electronic products because of their high specific capacity, long cycle life and high cost performance. The core components of a lithium-ion battery usually include a positive electrode, a negative electrode, and an electrolyte. At present, the cathode materials of lithium-ion batteries are mainly based on transition metal oxides (LiCoO 2 , LiNiCoMnO 2 , LiMn 2 o 4 ) or polyanionic metal compounds (LiFePO 4 ) mainly; but the specific capacity of the...

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): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 圣茂华
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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