Treatment process for improving stability and conductivity of high-nickel positive electrode material

A positive electrode material and processing technology, applied in the field of lithium ion battery positive electrode materials, can solve the problems of high sintering conditions, material sensitivity to air, poor rate performance, etc., to reduce the degree of lithium-nickel mixing, improve rate performance, Improved consistency and stability

Active Publication Date: 2019-10-18
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-nickel cathode materials still have the following disadvantages: the material has high requirements for sintering conditions, and lithium-nickel mixing is prone to occur during the sintering process; the surface of the sintered material is highly alkaline, which makes the material sensitive to air

Method used

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  • Treatment process for improving stability and conductivity of high-nickel positive electrode material
  • Treatment process for improving stability and conductivity of high-nickel positive electrode material
  • Treatment process for improving stability and conductivity of high-nickel positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0032] Example 1:

[0033] A treatment process to improve the stability and conductivity of high-nickel cathode materials,

[0034] Based on the high-temperature sintering furnace 6, a porcelain boat 1 is arranged inside the high-temperature sintering furnace 6, and a corundum tube 8 is provided on the outer cover of the porcelain boat 1, and the air inlet of the corundum tube 8 is provided with a carbon dioxide channel with a valve, oxygen channel and ozone channel, the ozone channel is also provided with an ozone generator 2, and the gas outlet of the corundum tube 8 is provided with an exhaust absorption device 7,

[0035] Described processing technology comprises the steps:

[0036] 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 uniformly according to the molar ratio of 1:1.05 according to the molar ratio, the mixture homogeneously mixed is placed in the porcelain boat 1, then the porcelain boat 1 is pu...

Example

[0046] Embodiment 2~5:

[0047] On the basis of Example 1, only the carbon dioxide plasma treatment time was changed, and the carbon dioxide plasma treatment time in Examples 6-9 were 10 min, 20 min, 30 min, and 50 min, respectively. The cycle performance of button batteries assembled with high-nickel cathode materials obtained under different conditions is shown in Table 1 (charge and discharge current density is 100mA / g), and the influence of carbon dioxide plasma treatment time on battery cycle stability was discussed.

[0048] Table 1: Effect of carbon dioxide plasma treatment time on battery cycle stability

[0049]

[0050] It can be seen from Examples 2-5 that the carbon dioxide plasma treatment can enhance the charge storage performance and cycle performance of the material, but if the treatment time is too long, the material will be damaged, and the cycle stability and capacity will be reduced.

Example

[0051] Embodiment 6~8:

[0052] On the basis of Example 1, the carbon dioxide annealing time was changed, and the carbon dioxide annealing time of Examples 6-8 were 20 min, 40 min, and 80 min, respectively. The cycle performance of button batteries assembled with high-nickel cathode materials obtained under different conditions is shown in Table 2 (charge and discharge current density is 100mA / g), and the influence of carbon dioxide annealing time on battery cycle stability was discussed.

[0053] Table 2: Effect of carbon dioxide annealing time on battery cycle stability

[0054]

[0055] It can be seen from Examples 6-8 that although the carbon dioxide annealing treatment will lose part of the initial discharge capacity, it can improve the cycle stability of the material.

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Abstract

The invention provides a treatment process for improving stability and conductivity of a high-nickel positive electrode material. The high-nickel positive electrode material obtained by sintering in an ozone atmosphere is subjected to carbon dioxide annealing treatment and carbon dioxide plasma treatment separately. According to the method, the material sintering time can be shortened, the productivity can be improved, the gas consumption can be reduced, and the cost can be lowered; in addition, the lithium-nickel mixing degree of the high-nickel positive electrode material can be reduced, theconsistency and the stability of the material can be improved, and the service life of the battery can be prolonged; continuous introduction of carbon dioxide gas for annealing treatment is carried out after sintering is completed, so that the carbon dioxide gas can react with lithium hydroxide remaining on the surface of the high-nickel positive electrode material, the content of residual alkalion the surface of the material is reduced, the sensitivity of the material to air is reduced, the storage time of the material is prolonged, and the processing performance of the material is improved; and finally, carbon dioxide plasma treatment is carried out, a layer of carbon layer coats the surface of the material, and the conductivity of the material is improved, so that the material rate performance is improved.

Description

technical field [0001] The invention relates to a treatment process for improving the stability and conductivity of high-nickel positive electrode materials, and belongs to the technical field of lithium ion battery positive electrode materials. Background technique [0002] With the development of new energy vehicles and lithium-ion power batteries, high-nickel cathode materials have become a research hotspot because of their high reversible charge-discharge capacity. However, high-nickel cathode materials still have the following disadvantages: the material has high requirements for sintering conditions, and lithium-nickel mixing is prone to occur during the sintering process; the surface of the sintered material is highly alkaline, which makes the material sensitive to air The reaction with carbon dioxide will cause the material to deteriorate from the outside to the inside. At the same time, too strong alkalinity will increase the viscosity of the prepared slurry, result...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 张文魁陈安琪王坤夏阳吴海军钱志挺毛秦钟黄辉张俊甘永平梁初
Owner ZHEJIANG UNIV OF TECH
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