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

Coated nickel lithium cobalt oxide positive material with high capacity, low residual alkali and low pH value, and preparation method thereof

A positive electrode material, lithium nickel cobalt oxide technology, applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of material internal structure collapse, high residual alkali on the product surface, cycle performance decline, etc., to achieve low cost and easy battery technology , the effect of high tap density

Active Publication Date: 2013-09-11
北京盟固利新材料科技有限公司
View PDF6 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the structure of lithium cobalt oxide itself, Li 1-x CoO 2 The deintercalation coefficient must satisfy x≤0.5, otherwise, excessive lithium deintercalation will cause the internal structure of the material to collapse, the capacity will drop rapidly, and the cycle performance will decrease. This structure causes the actual gram capacity of lithium cobalt oxide to only reach the theoretical gram capacity. Half, about 140mAh / g
Multi-material LiNi x co y mn 1-x-y o 2 , especially multi-component materials with high nickel content (x≥0.7) have the advantages of high capacity, excellent cycle, and low price, but the synthesized products have high residual alkali on the surface and high pH, ​​so the battery process is difficult to control, and the compaction density slightly inferior to lithium cobalt oxide

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
  • Coated nickel lithium cobalt oxide positive material with high capacity, low residual alkali and low pH value, and preparation method thereof
  • Coated nickel lithium cobalt oxide positive material with high capacity, low residual alkali and low pH value, and preparation method thereof
  • Coated nickel lithium cobalt oxide positive material with high capacity, low residual alkali and low pH value, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 65g of nickel hydroxide into a 1L reaction kettle, add 100g of prepared 10wt% ammonia solution into the reaction kettle, stir for half an hour and mix well. Use a peristaltic pump to slowly add 200ml of the configured 1.5mol / L cobalt sulfate solution into the reactor. At the same time, use a peristaltic pump to add 0.5mol / L sodium hydroxide solution at a uniform speed, and keep the solution during the feeding. The pH value was maintained at 11, until the cobalt sulfate solution was added and the lye feeding was stopped, and the stirring was continued for 3 hours. After aging for 12 hours, the temperature was maintained at 65°C during the reaction, and the stirring speed was 400r / min to obtain [Co(OH) 2 ] 0.3 ·[Ni(OH) 2 ] 0.7 The precursor was washed with deionized water until the pH was 8, and dried in a drying oven at 100 °C. Lithium hydroxide is added according to the total molar ratio of lithium to metal nickel-cobalt atoms at 1.00, mixed evenly, pretreated a...

Embodiment 2

[0025] Add 65g of nickel hydroxide into a 1L reactor, and add 100g of prepared 10wt% ammonia solution into the reactor. Mix well after stirring for half an hour. Use a peristaltic pump to slowly add 100ml of the prepared 3mol / L cobalt sulfate solution into the reactor at a certain speed. At the same time, use a peristaltic pump to add 0.5mol / L sodium hydroxide solution at a uniform speed. During this period, keep the pH value of the solution at 11, stop feeding until the cobalt sulfate solution is added, and continue to stir for 5 hours. After aging for 10 hours, the temperature was maintained at 65°C during the reaction, and the stirring speed was 400r / min to obtain [Co(OH) 2 ] 0.3 ·[Ni(OH) 2 ] 0.7 The precursor was washed with deionized water until the pH was 8, and dried in a drying oven at 100 °C. Lithium nitrate is added according to the total molar ratio of lithium to metal nickel and cobalt as 1.00, mixed evenly, pretreated at 520°C for 5 hours, cooled and ground, ...

Embodiment 3

[0027] Add 70g of nickel hydroxide into a 1L reactor, and add 100g of a prepared 30wt% ammonia solution into the reactor. Mix well after stirring for half an hour. Use a peristaltic pump to slowly add 250ml of 1mol / L cobalt sulfate solution into the reaction kettle at a certain speed. At the same time, use a peristaltic pump to add 1mol / L sodium hydroxide solution at a uniform speed. During the feeding Keep the pH value of the solution at 11, stop feeding until the cobalt sulfate solution is added, and continue to stir for 3 hours. After aging for 18 hours, the temperature was maintained at 55°C during the reaction, and the stirring speed was 400r / min to obtain [Co(OH) 2 ] 0.25 ·[Ni(OH) 2 ] 0.75 The precursor was washed with deionized water until the pH was 8, and dried in a drying oven at 100 °C. Lithium nitrate is added according to the total molar ratio of lithium to metal nickel and cobalt as 1.00, mixed evenly, pretreated at 520°C for 5h, cooled and ground, and calci...

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 relates to a coated lithium cobalt oxide positive material with high capacity, low residual alkali and low pH value, and a preparation method thereof. The method is mainly characterized in that cobaltous hydroxide is coated on the surface of nickelous hydroxide by utilizing a coprecipitation method, so as to form a precursor of a gradient material [Co(OH)2]x.[Ni(OH)2][1-x], wherein x is smaller than or equal to 0.35 and greater than 0; the precursor is mixed with a lithium source, then high-temperature sintering is carried out at oxygen atmosphere so as to obtain the lithium cobalt oxide positive material [LiCoO2]x.[LiNiO2][1-x] with a gradient structure. The prepared lithium cobalt oxide positive material with the gradient structure disclosed by the invention is low in pH value, excellent in cycle performance, simple in product process, easy to control, low in cost and suitable for volume production.

Description

technical field [0001] The invention relates to a high-capacity, low residual alkali, and low pH value coated lithium nickel cobalt oxide positive electrode material and a preparation method thereof, belonging to the technical field of energy material or new material preparation. Background technique [0002] Since Sony commercialized lithium-ion batteries in 1991, lithium-ion batteries have played an increasingly important role in people's lives, and now they are widely used in electronic products such as computers, cameras, mobile phones, and power vehicles. At present, cathode materials mainly include LiCoO with a layered structure 2 , LiNiO 2 , LiMnO 2 , LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , LiNi 0.5 co 0.2 mn 0.3 o 2 , LiNi 0.8 co 0.2 o 2 LiMn with spinel structure 2 o 4 ,LiNi 0.5 mn 1.5 o 4 LiFePO with olivine structure 4 Wait. As the market's requirements for energy density continue to increase, the development of lithium-ion batteries with high capacity ha...

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): H01M4/525
CPCY02E60/10
Inventor 崔妍江卫军吴剑文张溪苏迎春朱晓沛庞自钊白珍辉郝振佳
Owner 北京盟固利新材料科技有限公司
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