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NCA@metal oxide/carbon nano-tubes (CNT) composite cathode material and preparation method and application thereof

A carbon nanotube composite and composite positive electrode material technology, which is applied in the direction of positive electrodes, active material electrodes, battery electrodes, etc., can solve the problems of poor thermal stability, poor rate performance, and poor cycle performance of ternary positive electrode materials, and achieve improved electrochemical performance. And thermal stability, improve electrical conductivity, reduce the effect of dissolution

Inactive Publication Date: 2017-11-07
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Mi tube doping is used to improve the electrochemical performance and thermal stability of nickel-cobalt lithium aluminate cathode materials, and improve the poor thermal stability, poor cycle performance and poor rate of ternary cathode materials.

Method used

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  • NCA@metal oxide/carbon nano-tubes (CNT) composite cathode material and preparation method and application thereof
  • NCA@metal oxide/carbon nano-tubes (CNT) composite cathode material and preparation method and application thereof
  • NCA@metal oxide/carbon nano-tubes (CNT) composite cathode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Dissolve nickel nitrate, cobalt nitrate, and aluminum nitrate in deionized water at a molar ratio of 8:1.5:0.5, mix them evenly, inject them into a continuous mixer filled with argon, and then slowly drop them into the mixed lye of sodium hydroxide and ammonia water to control The pH value of the solution is 10, and as the reaction proceeds, a precursor of nickel-cobalt-lithium-aluminate cathode material is prepared.

[0035] 2. Dissolve 1 mol of copper nitrate in absolute ethanol and stir until it is completely dissolved; then weigh the nickel-cobalt-lithium-aluminate cathode material precursor whose molar number is 99 times that of the metal salt, add it, and stir at room temperature for 1 hour at a speed of 300 rpm ; Finally, place the above-mentioned nickel-cobalt-lithium-aluminate cathode precursor / metal salt ethanol solution in a drying oven and dry it; and make a nickel-cobalt-lithium-aluminate cathode precursor / copper nitrate composite material.

[0036] 3. M...

Embodiment 2

[0040] 1. Dissolve nickel nitrate, cobalt nitrate, and aluminum nitrate in deionized water at a molar ratio of 8:1.5:0.5, mix them evenly, inject them into a continuous mixer filled with argon, and then slowly drop them into the mixed lye of sodium hydroxide and ammonia water to control The pH value of the solution is 11, and as the reaction progresses, a precursor of nickel-cobalt-lithium-aluminate cathode material is prepared.

[0041] 2. Dissolve 1 mol of magnesium nitrate in absolute ethanol and stir until completely dissolved; then weigh the nickel-cobalt-lithium-aluminate cathode material precursor whose molar number is 98 times that of the metal salt, add it, and stir at room temperature for 2 hours at a speed of 400 rpm ; Finally, place the above-mentioned nickel-cobalt-lithium-aluminate cathode precursor / metal salt ethanol solution in a drying oven and dry it; and make a nickel-cobalt-lithium-aluminate cathode precursor / magnesium nitrate composite material.

[0042] 3...

Embodiment 3

[0045] 1. Dissolve nickel nitrate, cobalt nitrate, and aluminum nitrate in deionized water at a molar ratio of 8:1.5:0.5, mix them evenly, inject them into a continuous mixer filled with argon, and then slowly drop them into the mixed lye of sodium hydroxide and ammonia water to control The pH value of the solution is 10, and as the reaction proceeds, a precursor of nickel-cobalt-lithium-aluminate cathode material is prepared.

[0046] 2. Dissolve 1 mol of copper nitrate in methanol and stir until it is completely dissolved; then weigh the nickel-cobalt-lithium-aluminate cathode material precursor whose molar number is 95 times that of the metal salt, add it, and stir at room temperature for 3 hours at a speed of 500 rpm; finally The above nickel-cobalt-lithium-aluminate cathode precursor / metal salt ethanol solution is placed in a drying oven and dried to prepare a nickel-cobalt-lithium-aluminate cathode precursor / copper nitrate composite material.

[0047] 3. Mix the nickel-c...

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Abstract

The invention discloses an NCA@metal oxide / CNT composite cathode material and a preparation method and application of the NCA@metal oxide / CNT composite cathode material. The method comprises the following steps: (1) preparing an NCA cathode material precursor; (2) preparing an NCA cathode precursor / metal salt composite material; (3) preparing an NCA / metal salt composite cathode material; (4) preparing an NCA@metal oxide composite cathode material; and (5) preparing the materials of the NCA@metal oxide / CNT composite cathode material and the like. For the cathode material prepared by the invention, the first discharge specific capacity is 217.5 mAh / g and the first coulomb efficiency is 90.5% at the voltage of 2.8 V to 4.3 V and the discharge rate of 0.1 C. By adopting the NCA@metal oxide / CNT composite cathode material disclosed by the invention, the conductivity of the material is improved to improve the rate capability of the material, furthermore, electrochemical performances and thermal stability of the NCA cathode material are improved to improve low cyclic performance and rate capability of the cathode material.

Description

technical field [0001] The invention belongs to the technical field of lithium battery materials, and more specifically relates to a lithium nickel cobalt aluminate@metal oxide / carbon nanotube composite positive electrode material and its preparation method and application. Background technique [0002] Lithium-ion batteries have been the first to be put into practical use by Sony Corporation in 1990, and they have received great attention until today. Lithium-ion batteries are widely used in power tools, digital products, and medical equipment because of their high energy density, long cycle life, low self-discharge, no memory effect, and environmental friendliness. Lithium-ion batteries are mainly composed of positive and negative electrode materials, separators, electrolytes, etc., and positive electrode materials are one of the most core parts that determine the overall performance and cost of lithium-ion batteries. Life expectancy, safety, etc. have a direct impact, so...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 张国庆余剑琳李新喜李浩华何凤琪
Owner GUANGDONG UNIV OF TECH
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