A plasma-enhanced oxidation roasting device for synthesizing high-nickel cathode materials for lithium-ion batteries

A lithium-ion battery and discharge plasma technology, applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve the problems of high degree of cation mixing, achieve cost reduction, increase oxidation capacity and oxidation speed, and weaken the alkalinity of materials Effect

Active Publication Date: 2018-12-04
NINGBO UNIVERSITY OF TECHNOLOGY
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  • 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 a plasma-enhanced oxidation roasting method for the positive electrode material of lithium ion battery, to overcome the Ni 2+ Defects that are difficult to fully oxidize resulting in a high degree of cation mixing

Method used

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  • A plasma-enhanced oxidation roasting device for synthesizing high-nickel cathode materials for lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Weigh 0.1mol precursor Ni 0.80 co 0.15 al 0.05 (OH) 2 and 0.105mol lithium hydroxide LiOH·H 2 O, mix the precursor and lithium hydroxide powder evenly, and place them in a quartz tube (placed in the hearth of a quartz tube furnace). Pass oxygen-enriched air containing 90% oxygen into the quartz tube furnace at a flow rate of 100ml / min, and the reacted gas is discharged out of the quartz tube furnace, and the gas pressure in the furnace is kept 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 100W, so that the oxygen-containing gas generates plasma discharge in the tube to generate active oxygen. 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. In this process, the active oxygen generated by the plasma discharge effectively strengthens the oxidation of nickel and ...

Embodiment 2

[0068] with pure O 2The gas replaces the oxygen-enriched air containing 90% oxygen, and other conditions are the same as in Example 1 to 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 cathode material is about 0.7%, the pH is 11.18, the first Coulombic efficiency (0.1C) of the coin half-cell is 91.8%; the 0.1C gram specific capacity of the coin-type half-cell is 205mAh / g; The 1C gram specific capacity of the aluminum shell full battery is 175mAh / g, the 300-cycle cycle capacity retention rate is 97.6%, and the 500-cycle cycle capacity retention rate is 95.7%.

[0069] The prepared high-nickel cathode material also has excellent comprehensive performance, which is slightly better than that of Example 1, but very close. It shows that under the action of plasma-enhanced oxidation roasting, due to the large amount of active oxygen generated by the plasma, it...

Embodiment 3

[0071] The oxygen-enriched air containing 90% oxygen was replaced by air, and the other conditions were the same as in Example 1 to 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 2.5%, the pH is 11.78, 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 shell full battery is 165mAh / g, the 300-cycle cycle capacity retention rate is 93.6%, and the 500-cycle cycle capacity retention rate is 90.5%.

[0072] The prepared high-nickel cathode material also has good overall performance, which is worse than that of Example 1, but still relatively close. It shows that under the action of plasma-enhanced oxidation roasting, because the plasma produces a large amount of active oxygen, even air ca...

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Abstract

The invention discloses a plasma-enhanced oxidation roasting device for synthesizing high-nickel positive electrode materials for lithium-ion batteries. The plasma-enhanced oxidation roasting device includes a quartz tube furnace and an atmospheric pressure discharge plasma generator; the quartz tube type The furnace includes a quartz tube, an inlet pipe at one end of the quartz tube, and an exhaust pipe at the other end of the quartz tube; the atmospheric pressure discharge plasma generator includes a high voltage power supply and an atmospheric pressure built in the quartz tube furnace A discharge plasma generator; the gas pressure in the quartz tube furnace is maintained at normal pressure during the reaction process. The device is of great significance for improving the comprehensive performance of high-nickel cathode materials, especially for reducing the cation mixing degree of high-nickel cathode materials, improving the cycle performance and rate performance of materials, reducing the alkalinity of materials and improving the processing performance of materials.

Description

technical field [0001] The invention belongs to the technical field of energy material preparation, and in particular relates to a 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 capacity and energy density of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00H01M4/04H01M4/485H01M4/505H01M4/525H01M10/0525
CPCC01G53/50H01M4/0471H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 应皆荣
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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