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Electromagnetic field-constrained plasma enhanced oxidation calcination method of high-nickel positive electrode material of lithium ion battery

A lithium-ion battery and discharge plasma technology, which is applied to battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of low utilization rate of active oxygen, high degree of cation mixing, and limited enhanced oxidation. Achieve the effects of improving working conditions, increasing oxidation capacity and oxidation speed, and reducing production costs

Active Publication Date: 2017-07-28
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide an electromagnetic field-confined plasma enhanced oxidation roasting method for lithium-ion battery cathode materials, 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-constrained plasma enhanced oxidation calcination method of high-nickel positive electrode material of lithium ion battery
  • Electromagnetic field-constrained plasma enhanced oxidation calcination method of high-nickel positive electrode material of lithium ion battery
  • Electromagnetic field-constrained plasma enhanced oxidation calcination method of high-nickel positive electrode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] 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 500 W, 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 reacti...

Embodiment 2

[0082] 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%.

[0083] 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

[0085] 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%.

[0086] 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-constrained plasma enhanced oxidation calcination method of a high-nickel positive electrode material of a lithium ion battery. The method comprises uniformly mixing a precursor and lithium source powder, placing the mixture into a calcination device, carrying out calcination, continuously feeding oxygen-containing gas into the calcination device so that the oxygen-containing gas produces active oxygen with positive charge through plasma discharging, and applying an electromagnetic field in the calcination device so that active oxygen movement produces deflection, active oxygen is constrained and enriched around the precursor and lithium source powder and the high-nickel positive electrode material is synthesized. The method utilizes lithium carbonate as a lithium source, can synthesize the high-nickel positive electrode material having excellent performances in air, and observably reduces a material preparation cost. The method has a great significance for improving comprehensive performances of the high-nickel positive electrode material and has effects of reducing a cationic mixing degree of the high-nickel positive electrode material, improving cycle performances and a rate capability of the material, reducing material alkalinity and improving material processing performances.

Description

technical field [0001] The invention belongs to the technical field of energy material preparation, and in particular relates to an electromagnetic field-confined plasma enhanced oxidation roasting method for a high-nickel positive electrode material of a lithium ion battery. Background technique [0002] 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. [0003] High-nickel cathode materials usually refer to layered cathode materials with relatively high nickel content, including ternary nickel-cobalt-manganese lithium manganese oxide (type 622, 701515, 811, etc. according to the ratio of nickel-cobalt-manganese), nickel-cobalt-aluminate lithium NCA, And a variety of materials with various doping and modification formulations. The advantage of high-nickel materials is that the specific c...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M10/0525
CPCH01M4/525H01M10/0525Y02E60/10
Inventor 应皆荣
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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