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High-capacity monocrystal-like lithium nickel cobalt aluminate positive electrode material and preparation method thereof

A technology of lithium nickel cobalt aluminate and positive electrode materials, which is applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of increasing the cation mixing degree of positive electrode materials, reducing material capacity and cycle performance, and achieving the purpose of suppressing side effects. Reaction, reduce calcination temperature and time, prevent corrosion effect

Inactive Publication Date: 2019-03-08
郑州中科新兴产业技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Researchers have also done a lot of work on the preparation of single crystals of ternary cathode materials, but most of the preparation processes have strict requirements on the size of the precursor, and the final calcination temperature is above 900°C, and multiple calcination processes are required. Finally, the cation mixing degree of the positive electrode material is increased, which reduces the capacity and cycle performance of the material.

Method used

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  • High-capacity monocrystal-like lithium nickel cobalt aluminate positive electrode material and preparation method thereof
  • High-capacity monocrystal-like lithium nickel cobalt aluminate positive electrode material and preparation method thereof
  • High-capacity monocrystal-like lithium nickel cobalt aluminate positive electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The preparation method of the high-capacity single-crystal nickel-cobalt-lithium aluminate cathode material in this example is as follows:

[0028] 1) Preparation of quasi-single-crystal nickel-cobalt lithium aluminate precursor: calcining nickel-cobalt lithium aluminate hydroxide precursor at 500°C for 4 h to obtain oxides, cooling to room temperature, crushing through a 200-mesh sieve, and then oxidizing The material was crushed by ball milling to obtain a particle size distribution of D 50 6 μm quasi-single-crystal nickel-cobalt-lithium-aluminate precursor;

[0029] 2) Preparation of single-crystal nickel-cobalt lithium aluminate cathode material: according to the mass ratio of lithium hydroxide to precursor is 46%, additive B 2 o 3 The mass ratio to the precursor is 5%. Under an oxygen atmosphere, the first-stage calcination temperature is 500°C for 5 h, the second-stage calcination temperature is 750°C for 15 h, and the heating rate from 500°C to 750°C is 5°C / m...

Embodiment 2

[0033] The preparation method of the high-capacity single-crystal nickel-cobalt-lithium aluminate cathode material in this example is as follows:

[0034] 1) Preparation of quasi-single-crystal nickel-cobalt-lithium-aluminate precursor: calcining the nickel-cobalt-lithium-aluminate hydroxide precursor at 200°C for 10 hours to obtain the oxide, cooling to room temperature, crushing through a 200-mesh sieve, and then crushing the oxide Perform ball milling to obtain a particle size distribution of D 50 4.8 μm quasi-single crystal nickel cobalt lithium aluminate precursor;

[0035] 2) Preparation of single-crystal nickel-cobalt lithium aluminate cathode material: according to the mass ratio of lithium hydroxide to the precursor is 55%, the mass ratio of additives NaCl and KCl to the precursor is 0.05%, and the mass of NaCl and KCl is 1: 1. In an oxygen atmosphere, the calcination temperature of the first stage is 400°C for 10 hours, the temperature of the second stage is 800°C f...

Embodiment 3

[0039] The preparation method of the high-capacity single-crystal nickel-cobalt-lithium aluminate cathode material in this example is as follows:

[0040] 1) Preparation of quasi-single crystal nickel cobalt lithium aluminate precursor: calcining the nickel cobalt lithium aluminate hydroxide precursor at 450°C for 2 h to obtain the oxide, which was cooled to room temperature and crushed through a 200-mesh sieve, and then oxidized The material was crushed by ball milling to obtain a particle size distribution of D 50 7.5 μm quasi-single crystal nickel cobalt lithium aluminate precursor;

[0041] 2) Preparation of single-crystal nickel-cobalt lithium aluminate cathode material: according to the mass ratio of lithium hydroxide to the precursor is 40%, the mass ratio of the additive KF to the precursor is 20%, in the oxygen atmosphere, the first stage of calcination Calcination at 550°C for 4 h, second-stage calcination at 600°C for 24 h, heating rate from 550°C to 600°C at 1°C / m...

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Abstract

The invention discloses a high-capacity monocrystal-like lithium nickel cobalt aluminate positive electrode material and a preparation method thereof; the preparation method comprises the following steps of 1) preparing a monocrystal-like lithium nickel cobalt aluminate precursor; 2) preparing a monocrystal-like lithium nickel cobalt aluminate positive electrode material; and 3) performing coatingmodification on the monocrystal-like lithium nickel cobalt aluminate positive electrode material. According to the invention, a large-particle spherical precursor is utilized, and an additive is added in a lithium distribution calcination stage, so that the melting point of the material is reduced, and the crystal grain starts to grow and develop at a relatively low temperature, the positive electrode material with the small particle monocrystal morphology is finally generated, and the calcining temperature and time of the monocrystal ternary material in the preparation process are reduced, so that the generation cost is lowered; and the lithium-containing compound coating modification is carried out on the monocrystal-like lithium nickel cobalt aluminate positive electrode material, so that the residual alkali content on the surface of the material is reduced, erosion of an electrolyte to the material is prevented, the side effects are effectively inhibited, and the purpose of improving the performance of the material is achieved.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and in particular relates to a high-capacity single crystal nickel-cobalt lithium aluminate positive electrode material and a preparation method thereof. technical background [0002] Lithium-ion secondary batteries have the advantages of high capacity, long cycle, low self-discharge rate, and no pollution. They have been widely used in digital products, portable mobile tools and other fields. With the continuous updating of electronic products and the rapid development of hybrid electric vehicles and pure electric vehicles, higher requirements are placed on the energy density of batteries. High nickel nickel cobalt lithium aluminate (LiNi 0.8 co 0.15 al 0.05 o 2 , referred to as NCA) cathode material, because of its low cost, high capacity and environmental friendliness, it has a very broad market in the field of power batteries. [0003] At present, the...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/58H01M4/46H01M10/0525
CPCH01M4/366H01M4/463H01M4/485H01M4/505H01M4/5825H01M10/0525Y02E60/10
Inventor 刘艳侠马立彬李晶晶侯奥林于天恒张锁江刘凡
Owner 郑州中科新兴产业技术研究院
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