Aluminum doped nano-zinc oxide coated NCA positive material and preparation method thereof

A technology of nano-zinc oxide and nickel-cobalt-lithium aluminate, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as poor thermal stability and storage performance, and restrict development and application. Achieve the effects of improving electronic conductivity, preventing damage, and improving rate performance

Inactive Publication Date: 2017-06-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although NCA material is currently the cathode material with the highest capacity in commercialization, due to the material's poor thermal stability and storage performance, there are relatively difficult shortcomings in the electrode preparation process, which restricts its further development and application.

Method used

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  • Aluminum doped nano-zinc oxide coated NCA positive material and preparation method thereof
  • Aluminum doped nano-zinc oxide coated NCA positive material and preparation method thereof
  • Aluminum doped nano-zinc oxide coated NCA positive material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take a certain amount of zinc acetate dihydrate and add it to a 100ml beaker, add 30ml of absolute ethanol, then add ethanolamine in an equimolar ratio to zinc acetate and stir to dissolve the zinc acetate to form a uniform solution (solution A). Add aluminum nitrate nonahydrate to the solution in a molar ratio of 1:0.02 to zinc acetate, and stir for 1 hour to mix the solution evenly (solution B). Calculated on the basis that the aluminum-doped ZnO cladding layer accounts for 0.5%, 1%, 2%, and 3% of the product mass content, add nickel-cobalt lithium aluminate materials to the solution, and transfer the beaker to an oil bath at 80°C to keep the temperature Stir for 5h.

[0027] Transfer the obtained sol to a blast drying oven at 120°C for aging for 48 hours to obtain a gel, pre-fire the obtained gel at a constant temperature of 300°C for 3 hours in an oxygen atmosphere, bake at 600°C for 5 hours, cool naturally, and grind to obtain a coating finished product.

[0028]...

Embodiment 2

[0033]Get a certain amount of zinc sulfate heptahydrate and add in the 100ml beaker, add 30ml dehydrated alcohol, then add the ethanolamine that is 1:2 with zinc sulfate heptahydrate mol ratio and vigorously stir to make zinc sulfate heptahydrate dissolve and form a uniform solution (solution A). Add aluminum sulfate octahydrate to the solution with a molar ratio of 1:0.04 to zinc sulfate heptahydrate, and stir for 1 hour to mix the solution evenly (solution B). Assuming that the ZnO coating mass ratio is 2%, nickel-cobalt-lithium-aluminate material is added to the solution, and the beaker is transferred to an oil bath at 80° C. and stirred at constant temperature for 5 hours.

[0034] Transfer the obtained sol to a blast drying oven at 120°C for aging for 48 hours to obtain a gel, pre-fire the obtained gel at a constant temperature of 400°C for 2 hours in an oxygen atmosphere, bake at 650°C for 8 hours, and then cool naturally and grind to obtain a coating The amount is 2% o...

Embodiment 3

[0039] Take a certain amount of zinc acetate dihydrate and add it to a 100ml beaker, add 30ml of ethylene glycol, and then add diethanolamine with a molar ratio of 1:3 to zinc acetate and stir vigorously to dissolve the zinc acetate to form a uniform solution (solution A). Add aluminum nitrate nonahydrate to the solution in a molar ratio of 1:0.05 to zinc acetate, and stir for 2 hours to mix the solution evenly (solution B). Assuming that the ZnO coating mass ratio is 2%, nickel-cobalt-lithium-aluminate material is added to the solution, and the beaker is transferred to an oil bath at 80° C. and stirred at constant temperature for 5 hours.

[0040] Transfer the obtained sol to a blast drying oven at 120°C for aging for 48 hours to obtain a gel, pre-fire the obtained gel at a constant temperature of 350°C for 4 hours in an oxygen atmosphere, bake at 550°C for 4 hours, cool naturally, and grind to obtain a coating The amount is 2% of the finished product.

[0041] The positive ...

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Abstract

The invention relates to an aluminum doped nano-zinc oxide coated NCA positive material and a preparation method thereof. The preparation method includes: using an organic solvent to prepare a sol containing a aluminum source and a zinc source, adding NCA to acquire the NCA coated with the sol, performing drying and calcinations to acquire the aluminum doped nano-zinc oxide coated NCA positive material. The NCA is coated with an aluminum doped nano-zinc oxide film, the structural stability of the NCA is improved in a circulation process, aluminum doped zinc oxide semiconductors have excellent electronic transmission performance, impedance among material particles can be effectively reduced, and the circulation performance of the material can be improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a positive electrode material of a lithium ion secondary battery and a modification method thereof. Background technique [0002] Lithium-ion batteries have been widely used in 3C electronic products, electric vehicles, energy storage equipment and marine fields due to their significant advantages such as environmental friendliness, high working voltage, high energy density, long cycle life and low self-discharge. The most critical thing in lithium-ion batteries is the positive electrode material. At present, the widely studied positive electrode materials for lithium-ion batteries are lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (NCM), nickel cobalt oxide Lithium aluminate (NCA) and lithium-rich manganese-based cathode materials. [0003] In the layered nickel-cobalt li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82Y30/00H01M4/36H01M4/48H01M4/525
CPCB82Y30/00H01M4/366H01M4/48H01M4/525Y02E60/10
Inventor 王志兴刘大应郭华军王接喜李新海胡启阳彭文杰赵俊楷
Owner CENT SOUTH UNIV
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