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

Sintering process of a high-stability lithium-ion high-nickel cathode material

A cathode material, high-stability technology, applied in nickel compounds, structural parts, electrode manufacturing, etc., can solve the problems of high degree of lithium-nickel mixing, increasing the difficulty of material storage and processing, and lithium-nickel mixing, etc. The effect of lithium-nickel mixing degree, shortening sintering time, and reducing dosage

Active Publication Date: 2022-04-01
ZHEJIANG UNIV OF TECH +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: the surface alkalinity of high-nickel cathode materials is strong, which makes the materials very sensitive to acid gases such as air humidity and carbon dioxide in the air, which increases the difficulty of material storage and processing; due to the radius of divalent nickel ions and lithium ions It is relatively close, and it is easy to appear the phenomenon of lithium-nickel mixing. In order to reduce the degree of lithium-nickel mixing, it is necessary to fully oxidize divalent nickel ions into trivalent nickel ions, which puts high requirements on the sintering conditions. It will be sintered in a pure oxygen atmosphere, but through XRD refinement, it is found that the degree of lithium-nickel mixing of the positive electrode material obtained by sintering in an oxygen atmosphere is still high

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
  • Sintering process of a high-stability lithium-ion high-nickel cathode material
  • Sintering process of a high-stability lithium-ion high-nickel cathode material
  • Sintering process of a high-stability lithium-ion high-nickel cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this embodiment, the sintering process for preparing a high-nickel positive electrode material for a high-stability lithium-ion battery is based on a high-temperature sintering furnace 6, and the high-temperature sintering furnace 6 is provided with a corundum tube 8 with a porcelain boat 1 inside. The gas port is provided with a carbon dioxide channel with a valve, an oxygen channel and an ozone channel in parallel, an ozone generator 2 is also provided on the ozone channel, and an exhaust gas absorption device 7 is provided at the gas outlet of the corundum tube 8,

[0029] Described sintering process comprises the steps:

[0030] S1, the high-nickel cathode material precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 and lithium salt LiOH·H 2 O is mixed evenly according to the molar ratio of 1:1.05 according to the molar ratio, and the mixture after mixing is placed in porcelain boat 1, then porcelain boat 1 is put into high-temperature sintering furnace 6, seals, checks th...

Embodiment 2～5

[0038] On the basis of Example 1, change the number of times that the ozone gas is passed into, and the times of the ozone gas into the embodiments 2 to 5 are respectively 1 time, 2 times, 4 times, 5 times, and do not change the time of passing into the ozone gas each time , That is to say, the ozone gas was passed through for 20 min, 40 min, 80 min, and 100 min in total in Examples 2 to 5. The cycle performance of button batteries assembled with high-nickel cathode materials obtained under different conditions is shown in Table 1 (the charge and discharge current density is 100mA / g), and the influence of the time of ozone introduction on the battery cycle performance was discussed.

[0039] Table 1: The influence of the time of passing ozone on the cycle performance of the battery

[0040]

[0041] It can be seen from Examples 2 to 5 that, under the condition that other conditions remain unchanged, the longer the ozone time is, the higher the capacity retention rate of the...

Embodiment 6～9

[0043]On the basis of Example 1, the highest sintering temperature was changed, and the highest sintering temperatures of Examples 6-9 were 720°C, 740°C, 780°C, and 800°C, respectively. The cycle performance of the button battery assembled with the high-nickel cathode material obtained under different conditions is shown in Table 2 (the charge and discharge current density is 100mA / g), and the influence of the highest sintering temperature on the cycle stability of the battery is discussed.

[0044] Table 2: Effect of maximum sintering temperature on battery cycle stability

[0045]

[0046] It can be seen from Examples 6-9 that the maximum sintering temperature has a great influence on the cycle performance of the material, and the cycle performance of the material will be deteriorated if the sintering temperature is too low or too high.

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 provides a sintering process of a high-stability lithium-ion high-nickel positive electrode material. The precursor of the high-nickel positive electrode material and lithium salt are uniformly mixed according to a certain ratio and then sintered in an ozone atmosphere. After the sintering is completed, carbon dioxide annealing treatment is performed to obtain High stability and high nickel cathode material. This method can not only shorten the sintering time of the material, increase the production capacity, reduce the amount of gas used, and reduce the cost, but also reduce the lithium-nickel mixing degree of the high-nickel cathode material, and improve the consistency and stability of the material. Continue to feed carbon dioxide gas after sintering to make it react with lithium hydroxide remaining on the surface of the high-nickel positive electrode material, generate lithium carbonate with good crystallinity in situ, reduce the pH value of the material surface, improve the processing performance of the material, and Reduce the sensitivity of the material to air and prolong the storage time of the material. Since the material can be obtained by one-step sintering, the complexity of the process is reduced.

Description

technical field [0001] The invention relates to a sintering process of a high-stability lithium-ion high-nickel positive electrode material, and belongs to the technical field of sintering of lithium-ion battery positive electrode materials. Background technique [0002] High-nickel cathode materials have higher reversible discharge capacity and higher average working voltage, so they have higher energy density, and are expected to become the cathode materials for next-generation lithium-ion power batteries. However, there are still many problems in high-nickel cathode materials, which hinder the advancement of its industrialization. For example: the surface alkalinity of high-nickel cathode materials is strong, which makes the materials very sensitive to acid gases such as air humidity and carbon dioxide in the air, which increases the difficulty of material storage and processing; due to the radius of divalent nickel ions and lithium ions It is relatively close, and it is...

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 Patents(China)
IPC IPC(8): H01M4/04C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006H01M4/505H01M4/525H01M4/0471H01M10/0525C01P2002/72C01P2004/03C01P2006/40Y02E60/10
Inventor 夏阳王坤陈安琪张文魁吴海军钱志挺毛秦钟黄辉甘永平张俊梁初
Owner ZHEJIANG UNIV OF TECH
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