Selenium and silicate co-doped high-nickel cathode material, and preparation method and application thereof

A positive electrode material, silicate technology, applied in the field of selenium, silicate co-doped high-nickel positive electrode material and its preparation, to achieve the effect of improving the electronic conductivity of the material, excellent capacity retention rate, and conducive to large-scale promotion

Active Publication Date: 2019-04-16
LANGFANG GREEN IND TECH CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the above method improves the performance of high-nickel cathode materials through doping modification, it still has certain limitations, and there is still room for improvement in the electrochemical performance of high-nickel cathode materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This embodiment provides a selenium, silicate co-doped high-nickel positive electrode material, the chemical formula of the positive electrode material is LiNi 0.8 co 0.1 mn 0.1 Se 0.02 (SiO 4 ) 0.05 o 1.93 .

[0053] Prepare as follows:

[0054] (1) Batching is carried out according to the content of each element in the chemical formula, and the mixed solution of nickel nitrate, cobalt nitrate, manganese nitrate and the hydrazine hydrate solution of selenium and the ethanol of tetraethyl orthosilicate are added concurrently in the reaction vessel with stirring device Solution, add appropriate amount of sodium hydroxide solution and ammonia water at the same time, control the temperature at 45 ° C, pH value of 10 and stir for 4 hours. After the reaction is completed, the solid-liquid separation is carried out to obtain the precursor of the positive electrode material;

[0055] (2) Mix the positive electrode material precursor obtained in step (1) with lithium hyd...

Embodiment 2

[0058] This embodiment provides a selenium, silicate co-doped high-nickel positive electrode material, the chemical formula of the positive electrode material is LiNi 0.6 co 0.2 Al 0.2 Se 0.01 (SiO 4 ) 0.02 o 1.97 .

[0059] Prepare as follows:

[0060] (1) Dosing according to the content of each element in the chemical formula, add the mixed solution of nickel nitrate, cobalt oxalate, sodium metaaluminate and the hydrazine hydrate solution of selenium and ethyl orthosilicate to the reaction vessel with stirring device Add an appropriate amount of sodium hydroxide solution and ammonia water at the same time, control the temperature to 75 ° C, and the pH value to 12.5 to stir and react for 4 hours. After the reaction is completed, the solid-liquid separation is carried out to obtain the precursor of the positive electrode material;

[0061] (2) Mix the positive electrode material precursor obtained in step (1) with lithium carbonate, control the molar ratio of the lithiu...

Embodiment 3

[0064] This embodiment provides a selenium, silicate co-doped high-nickel positive electrode material, the chemical formula of the positive electrode material is LiNi 0.7 co 0.1 mn 0.1 Al 0.1 Se 0.05 (SiO 4 ) 0.03 o 1.92 .

[0065] Prepare as follows:

[0066] (1) Dosing according to the content of each element in the chemical formula, add the mixed solution of nickel nitrate, cobalt oxalate, manganese nitrate, sodium metaaluminate and the hydrazine hydrate solution of selenium and orthosilicon into the reaction vessel with stirring device Ethyl acetate ethanol solution, adding appropriate amount of sodium hydroxide solution and ammonia water at the same time, controlling the temperature at 60°C, pH value of 11 to carry out stirring reaction for 10h, after the reaction is completed, the solid-liquid separation is carried out to obtain the precursor of the positive electrode material;

[0067] (2) Mix the positive electrode material precursor obtained in step (1) with l...

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Abstract

The invention relates to a selenium and silicate co-doped high-nickel cathode material, and a preparation method and application thereof. The cathode material is a selenium and silicate co-doped modified high-nickel cathode material, and has a chemical formula of LiNixM1-xSea (SiO4) bO2-a-b, wherein M is at least one of Mn, Co or Al, and 0.5 <= x < 1, 0 < a <= 0.05, 0 < b <=0.05. The high-nickel cathode material is doped with low-valence anions by the selenium and silicate so as to improve the lattice structure of the material. The selenium and the silicate have good synergistic effect, can improve the structural stability of the material under high voltage, and obviously improve the electrochemical performance of the high-nickel cathode material. The obtained cathode material has a firstcycle discharge specific capacity greater than or equal to 185mAh/g and a capacity retention rate greater than or equal to 85% after 200 cycles at a 2.5-4.2V voltage window and 0.1C current density, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a high-nickel positive electrode material co-doped with selenium and silicate, a preparation method and application thereof. Background technique [0002] With the vigorous development of new energy vehicles, the lithium-ion battery industry has entered a stage of rapid development. The key materials that affect the performance of lithium-ion batteries mainly include positive electrode materials, negative electrode materials, and electrolytes. Among them, the positive electrode material is currently the main factor limiting battery performance, and it is also the main factor accounting for the high cost of lithium-ion batteries, which is close to 40%. [0003] In recent years, the most researched cathode materials mainly include lithium iron phosphate, lithium manganese oxide, and ternary materials. Among them, high-nic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/525H01M4/505H01M4/36H01M4/38H01M4/58H01M10/0525
CPCH01M4/362H01M4/38H01M4/485H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 谭强强夏青
Owner LANGFANG GREEN IND TECH CENT
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