Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of ruthenium-doped lithium cobalt oxide positive electrode material with core-shell structure

A technology of structural lithium cobaltate and positive electrode materials, applied in the direction of positive electrodes, structural parts, chemical instruments and methods, etc., can solve the problems of poor rate performance, unfavorable lithium ion migration and diffusion, etc., and achieve improved rate performance and fast ion transmission Effects of mild nature and conditions

Pending Publication Date: 2022-03-15
GEM JIANGSU COBALT IND CO LTD
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, as a coating material, oxides are not conducive to the migration and diffusion of lithium ions, and show poor rate performance under high-rate test conditions.

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 ruthenium-doped lithium cobalt oxide positive electrode material with core-shell structure
  • Preparation method of ruthenium-doped lithium cobalt oxide positive electrode material with core-shell structure
  • Preparation method of ruthenium-doped lithium cobalt oxide positive electrode material with core-shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of Ru-LCO cathode material:

[0039] Weigh 140g of cobalt tetroxide, 66.65g of lithium carbonate and 0.227g of ruthenium dioxide and place them in a ball milling tank for mixing. The ball milling speed is 300rad / min, and the ball milling time is 1h. Transfer the sagger to a muffle furnace, heat up to 1020°C at a rate of 7°C / min for calcination for 10 hours, and continuously feed air as an oxygen source during the sintering process; take it out after naturally cooling to room temperature; place the obtained sample in In a small universal pulverizer, grind for 20 seconds, pour the pulverized sample into a 325-mesh sieve for sieving treatment, collect the sieved sample, and obtain Ru-LCO;

[0040] Preparation of Ru-LCO / M cathode material:

[0041] Weigh 100g of Ru-LCO and 0.189g of ZrB 2 Put it in a ball mill jar for mixing, the ball mill speed is 300rad / min, and the ball mill is 0.5h. The blended powder is evenly and evenly distributed in the sagger, and the...

Embodiment 2

[0043] Preparation of Ru-LCO cathode material:

[0044] a. First mix tricobalt tetroxide, lithium carbonate and ruthenium dioxide, the mass fraction of ruthenium dioxide is 0.1%, put the mixed raw materials into a ball mill for mixing ball milling, the speed of the ball mill is 300rad / min, and the ball milling time is 1h; then the mixture after ball milling Transfer to a muffle furnace for calcination, set the temperature rise rate of the muffle furnace to 5°C / min, the calcination temperature is 1000°C, and the calcination time is 8h. Air is continuously fed in during the calcination process as an oxygen source. After the calcination, the sample is cooled to room temperature and taken out. .

[0045] b. After the sample obtained in step a is coarsely pulverized with a mortar, pour it into a universal pulverizer for pulverization. The speed of the universal pulverizer is 25000r / min, and the pulverization time is 15s. Pour the pulverized sample into a 325-mesh sieve for sieving...

Embodiment 3

[0050] Preparation of Ru-LCO cathode material:

[0051] a. first mix tricobalt tetroxide, lithium carbonate and ruthenium dioxide, the mass fraction of ruthenium dioxide is 0.2%, put the mixed raw materials into a ball mill for mixed ball milling, the ball mill speed is 300rad / min, and the ball milling time is 1.5h; then the ball milled The mixture was transferred to a muffle furnace for calcination. The temperature rise rate of the muffle furnace was set at 10°C / min, the calcination temperature was 1050°C, and the calcination time was 10h. During the calcination process, air was continuously introduced as an oxygen source. After the calcination, the sample was cooled to room temperature. take out.

[0052] b. Roughly pulverize the sample obtained in step a with a mortar, pour it into a universal pulverizer for pulverization, the speed of the universal pulverizer is 25000r / min, and the pulverization time is 30s. Pour the pulverized sample into a 325-mesh sieve for sieving tre...

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 ruthenium-doped lithium cobalt oxide positive electrode material with a core-shell structure. The preparation method comprises the following steps: mixing and ball-milling cobalt salt, a lithium source and a ruthenium compound according to a certain proportion; the preparation method comprises the following steps: ball-milling lithium cobalt oxide powder, calcining the ball-milled mixture, crushing the calcined sample, sieving to obtain ruthenium-doped lithium cobalt oxide powder, mixing the product with a metal boron compound, ball-milling, and calcining to finally prepare the ruthenium-doped lithium cobalt oxide with the core-shell structure. The Ru-doped core-shell structure lithium cobalt oxide prepared by the preparation method disclosed by the invention is high in purity and free of impure phase, the doping layer can keep high conductivity and lithium ion diffusion coefficient of the lithium cobalt oxide positive electrode material, the rate capability of the doped lithium cobalt oxide is effectively improved, the corrosion of electrolyte to the positive electrode material can be effectively reduced, the cycle performance of the positive electrode material under 4.45 V voltage is improved, and the service life of the positive electrode material is prolonged. The irreversible phase change of the reaction is effectively inhibited, and the electrochemical stability is ensured. In addition, the method is simple, efficient, mild in condition and beneficial to industrial large-scale production.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium batteries, in particular to a method for preparing a ruthenium-doped core-shell structure lithium cobaltate positive electrode material. Background technique [0002] Lithium-ion batteries are not only widely used in small and medium-sized portable devices such as smartphones, notebook computers, and digital cameras, but also develop in the direction of new energy vehicles and energy storage. Among them, lithium cobalt oxide (LiCoO 2 ) are widely used commercially due to their high theoretical specific capacity, simple synthesis process, and stable charge-discharge platform. But LiCoO 2 There are also some disadvantages, LiCoO 2 is α-NaFeO 2 Layered structure, when charging, lithium ions detach, LiCoO 2 The material generates delithiated Li 1-x CoO 2 , and expand along the c-axis. But when the charging voltage exceeds 4.2V, LiCoO 2 The transition from the electroche...

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): C01G51/00C01B35/04H01M4/36H01M4/525H01M4/62H01M10/0525
CPCC01G51/50C01B35/04H01M4/525H01M4/366H01M4/628H01M4/62H01M10/0525H01M2004/028C01P2004/03C01P2006/40C01P2004/80Y02E60/10
Inventor 许开华杨荣杨克涛王彦刚宋亚芳张银鹏
Owner GEM JIANGSU COBALT IND CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap 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