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High-nickel ternary positive electrode material coated with fast ion conductor, preparation method thereof, and lithium ion battery prepared from material

A technology of lithium-ion batteries and ion conductors, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of poor conductivity and inability to provide enough channels for lithium ion migration, so as to reduce residual lithium and suitably Suitable for large-scale production and high capacity retention

Inactive Publication Date: 2019-06-14
ZOTYE INT AUTOMOBILE TRADING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In previous studies, commonly used Al 2 o 3 、TiO 2 , ZrO 2 , MgO, etc. as coatings, but most of these oxides have poor conductivity and cannot provide enough channels for the migration of lithium ions

Method used

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  • High-nickel ternary positive electrode material coated with fast ion conductor, preparation method thereof, and lithium ion battery prepared from material
  • High-nickel ternary positive electrode material coated with fast ion conductor, preparation method thereof, and lithium ion battery prepared from material
  • High-nickel ternary positive electrode material coated with fast ion conductor, preparation method thereof, and lithium ion battery prepared from material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for preparing a high-nickel ternary cathode material coated by a fast ion conductor, comprising the following steps:

[0039] (1) Synthesis of nickel cobalt manganese hydroxide precursor;

[0040] (1-1) nickel nitrate, cobalt nitrate and manganese nitrate are dissolved in deionized water according to the stoichiometric ratio of 8:1:1,

[0041] A salt solution I was obtained; the total concentration of the three metal salts in the solution I was 2.0 mol / L.

[0042] (1-2) Dissolving KOH powder in deionized water to obtain precipitant solution II; the concentration of KOH in the precipitant solution II is 6mol / L.

[0043](1-3) Mix ammonia water and deionized water to obtain complexing agent solution III; the concentration of ammonia water in the complexing agent solution III is 2mol / L.

[0044] (1-4) Inject the salt solution I, the precipitant solution II and the complexing agent solution III into the reaction kettle at the same time and mix them, and pass nitro...

Embodiment 2

[0052] A method for preparing a high-nickel ternary cathode material coated by a fast ion conductor, comprising the following steps:

[0053] (1) Synthesis of nickel cobalt manganese hydroxide precursor;

[0054] (1-1) Nickel chloride, cobalt chloride and manganese chloride are dissolved in deionized water according to the stoichiometric ratio of 7:1.5:1.5 to obtain salt solution I; the total concentration of the three metal salts in the solution I is 2.0mol / L.

[0055] (1-2) Sodium hydroxide powder was dissolved in deionized water to obtain precipitant solution II; the concentration of sodium hydroxide in the precipitant solution II was 6 mol / L.

[0056] (1-3) Sodium citrate is mixed with deionized water to obtain complexing agent solution III; the concentration of sodium citrate in the complexing agent solution III is 3mol / L.

[0057] (1-4) Inject the salt solution I, the precipitant solution II and the complexing agent solution III into the reaction kettle at the same tim...

Embodiment 3

[0062] A method for preparing a high-nickel ternary cathode material coated by a fast ion conductor, comprising the following steps:

[0063] (1) Synthesize nickel cobalt manganese hydroxide precursor according to the same method as in Example 1;

[0064] (2) the nickel cobalt manganese hydroxide precursor that step (1) obtains and lithium hydroxide powder, Al 2 o 3 powder, MgO powder and TiO 2 Powder mixing, nickel cobalt manganese hydroxide precursor and lithium hydroxide powder, (Al 2 o 3 +MgO+TiO 2 ) with a molar ratio of 1:1.06:0.08, high-speed ball milling and mixing for 5 hours, and then calcining the mixture at 850° C. for 15 hours in an oxygen atmosphere to obtain a high-nickel ternary positive electrode material doped with Al, Mg and Ti;

[0065] (3) The fast ion conductor Li 1.5 al 0.5 sn 1.5 (PO 4 ) 3 Ball milled into powder, then mixed with Al, Mg and Ti-doped high-nickel cathode material for 5 hours, Al, Mg and Ti-doped high-nickel cathode material and ...

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Abstract

The invention discloses a high-nickel ternary positive electrode material coated with a fast ion conductor, a preparation method thereof, and a lithium ion battery prepared from the material. The basematerial of the high-nickel ternary positive electrode material coated with the fast ion conductor is LiNi1-x-yCoxMnyMzO2, wherein x is more than 0 and not more than 0.15, y is more than 0 and not more than 0.15, z is not less than 0 and not more than 0.1, and M is any one or more of Al, Mg, Co, Ni, Ti, Fe, Zr, and Sn; and the chemical general formula of the fast ion conductor is Li1+aAaD2-a(PO4)3, wherein A is any one or more of Al, Cr, Ga, Fe, Sc, In, Lu, Y, and La, D is any one or more of Ti, Ge, Zr, Sn and Hf, and a is more than 0 and not more than 1. The coating of the surface with the fast ion conductor can effectively reduce the residual lithium on the surface of the ternary positive electrode material, and reduces side reactions of the ternary positive electrode material and an electrolyte; and the lithium ion battery assembled by using the positive electrode material has a high first charge-discharge specific capacity and a high capacity retention.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a high-nickel ternary positive electrode material coated with a fast ion conductor, a preparation method thereof, and a lithium-ion battery prepared by the same. Background technique [0002] In recent years, the increasingly serious environmental problems and the shortage of petrochemical resources have aroused people's attention to green energy. Electric vehicles powered by green batteries, especially lithium-ion batteries, have become the focus of research by companies and scientific research institutions around the world. With the increasing demand for high-energy-density lithium-ion power batteries for electric vehicles, nickel-cobalt-manganese ternary cathode materials and their derivatives have shown broad application prospects due to their high theoretical specific capacity. [0003] In order to improve the energy density of the battery, the conten...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/36H01M4/48H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 夏妍金源牛丽媛郭永斌柳晓燕王康彦
Owner ZOTYE INT AUTOMOBILE TRADING CO LTD
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