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Electromagnetic field constraint plasma enhanced oxidation roasting device for synthesizing high-nickel positive electrode material of lithium ion battery

一种锂离子电池、放电等离子体的技术，应用在电池电极、二次电池、电化学发生器等方向，能够解决阳离子混排度高、强化氧化作用受限、活性氧利用率低等问题，达到阳离子混排度低、改善劳动条件、降低制备成本的效果

Active Publication Date: 2019-06-14
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide an electromagnetic field-confined plasma enhanced oxidation roasting device for synthesizing high-nickel positive electrode materials for lithium-ion batteries, to overcome the Ni 2+ It is difficult to fully oxidize the defects that lead to a high degree of cation mixing, and at the same time overcome the active oxygen (O + , O 2 + , O 3 + etc.) dispersed in the quartz tube, the utilization rate of active oxygen is low, and the defect of strengthening oxidation is limited

Method used

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  • Electromagnetic field constraint plasma enhanced oxidation roasting device for synthesizing high-nickel positive electrode material of lithium ion battery
  • Electromagnetic field constraint plasma enhanced oxidation roasting device for synthesizing high-nickel positive electrode material of lithium ion battery
  • Electromagnetic field constraint plasma enhanced oxidation roasting device for synthesizing high-nickel positive electrode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Weigh 0.1mol precursor Ni 0.80 co 0.15 al 0.05 (OH) 2 and 0.0525mol lithium carbonate, the precursor and lithium carbonate powder are uniformly mixed, placed in a quartz tube (placed in a quartz tube furnace). Air is introduced into the quartz tube furnace at a flow rate of 500ml / min, and the reacted gas is discharged out of the quartz tube furnace, and the gas pressure in the furnace is maintained at normal pressure. Using an AC power supply, adjust the voltage of the atmospheric pressure discharge plasma generator to 10kV, the frequency to 15kHZ, and the power to 500W, so that plasma discharge occurs in the air in the tube to generate active oxygen. Adjust the electric field intensity generated by the deflection electric field generator to 5kV / m, and adjust the magnetic induction intensity generated by the magnet to 2T. The quartz tube furnace was raised to 800°C at a heating rate of 200°C / h, kept for 12h and then cooled to room temperature naturally. The reactiv...

Embodiment 2

[0083] Turn off the deflection electric field generator, and other conditions are the same as in Example 1, and synthesize nickel-cobalt lithium aluminate, a high-nickel positive electrode material. The cation mixing degree in the nickel-cobalt lithium aluminate cathode material is measured to be about 2.5%, the pH is 11.58, the first Coulombic efficiency (0.1C) of the coin half-cell is 88.8%; the 0.1C gram specific capacity of the coin-type half-cell is 201mAh / g; The 1C gram specific capacity of the aluminum shell full battery is 165mAh / g, the 300-cycle capacity retention rate is 92.6%, and the 500-cycle capacity retention rate is 89.5%.

[0084] The overall performance of the material is lower than that of Example 1, which shows that light has magnetic field confinement but not electric field confinement, and the confinement and enrichment effect of plasma is weakened, which affects the enhanced oxidation roasting effect.

Embodiment 3

[0086] Turn off the electromagnet, and other conditions are the same as in Example 1, and synthesize nickel-cobalt lithium aluminate, a high-nickel positive electrode material. It is measured that the cation mixing degree in the nickel-cobalt lithium aluminate positive electrode material is about 2.4%, the pH is 11.60, the first coulombic efficiency (0.1C) of the coin half-cell is 89.8%; the 0.1C gram specific capacity of the coin-type half-cell is 201mAh / g; The 1C gram specific capacity of the aluminum case full battery is 166mAh / g, the 300-cycle cycle capacity retention rate is 92.7%, and the 500-cycle cycle capacity retention rate is 90.5%.

[0087] The comprehensive performance of the material is lower than that of Example 1, which shows that there is only electric field confinement but no magnetic field confinement, and the confinement and enrichment effect of plasma will also be weakened, which affects the enhanced oxidation roasting effect.

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Abstract

The invention discloses an electromagnetic field constraint plasma enhanced oxidation roasting device for synthesizing a high-nickel positive electrode material of a lithium ion battery, wherein the plasma enhanced oxidation roasting device comprises a quartz tube furnace and an atmospheric pressure discharge plasma generation device; the quartz tube furnace comprises a quartz tube, an air inlet pipe positioned at one end of the quartz tube, and an exhaust pipe positioned at the other end of the quartz tube; a deflection electromagnetic field is arranged in the quartz tube, and a reactant delivery region is arranged in the quartz tube; the deflection electromagnetic field enables active oxygen to deflect in the direction of the reactant delivery region; the atmospheric pressure discharge plasma generation device comprises a high-voltage power supply and an atmospheric pressure discharge plasma generator arranged in the quartz tube. The electromagnetic field constraint plasma enhanced oxidation roasting device has important significance for improving the comprehensive performance of the high-nickel positive electrode material, and especially has remarkable effects of reducing the cation mixing and discharging degree of the high-nickel positive electrode material, improving the cycling performance and the rate performance of the material, lowering the material alkalinity and improving the material processing performance.

Description

[0001] This application is a divisional application. The original patent number is: 201710380473.2, the application date: May 25, 2017, and the title of the invention is: an electromagnetic field-confined plasma enhanced oxidation roasting method for high-nickel cathode materials for lithium-ion batteries. technical field [0002] The invention belongs to the technical field of energy material preparation, and in particular relates to an electromagnetic field-confined plasma enhanced oxidation roasting device for synthesizing high-nickel positive electrode materials for lithium-ion batteries. Background technique [0003] With the rapid development of related industries such as portable electronic products and new energy vehicles, the market demand for lithium-ion batteries has grown rapidly, and the demand for cathode materials has also increased rapidly. [0004] High-nickel cathode materials usually refer to layered cathode materials with relatively high nickel content, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M10/0525
CPCH01M4/525H01M10/0525Y02E60/10
Inventor 应皆荣
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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