Surface coating modified lithium ion battery cathode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of non-conductivity of metal compounds, poor conductivity of positive electrode materials, and reduced electrochemical performance of batteries, etc., to achieve excellent safety. performance and cycle performance, improved stability, lower energy consumption and cost effectiveness

Inactive Publication Date: 2015-04-29
ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented method improves on current methods by adding Lithium Iron Phosphorite (LFP) onto certain types of metal oxide particles used as an Active Material in batteries. LFP helps protect them from corrosion caused by other substances like water vapor and oxygen gas. Additionally, this modification enhance its properties such as reducing resistance when compared to pure LiFePO4. By applying these modified surfaces to the negative elec trodes made up of different metals instead of just one type of element alone, they have better security and compactness while also maintaining their ability to release electrical charges effectively without losing any significant amount of power overtime.

Problems solved by technology

This patented technical solution involves modifying certain types or forms of laminated transition metals (LM) that are important for improving their properties such as reducing water absorption by replacing some atoms within them with other elements like oxygen or nitrogen instead of silicon dioxane). These modifications help increase the stability of LM layers while also allowing more Li+ ion movement through it compared to pure tin oxide. Additionally, adding another element called Mg helps enhance the cycling characteristics of these modified materials without compromising their ability to store electrical energy.

Method used

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  • Surface coating modified lithium ion battery cathode material and preparation method thereof
  • Surface coating modified lithium ion battery cathode material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0025] According to the molar ratio of Ni:Co:Al of 0.8:0.15:0.05 to prepare a mixed aqueous solution of nickel nitrate, cobalt nitrate and aluminum nitrate nonahydrate with a total metal concentration of 1mol / L; prepare a mixture of NaOH and ammonia with a total concentration of 10mol / L Solution in which the molar ratio of NaOH and ammonia is 1:1.

[0026] Add the above two solutions to the reactor at a certain speed at the same time, control the pH of the reaction to 12, the reaction temperature is 50 ℃, react for 6 hours and then age for 8 hours, after filtering, washing and drying to obtain lithium nickel cobalt aluminate Positive electrode material precursor.

[0027] After mixing the above-mentioned nickel cobalt lithium aluminate cathode material precursor and lithium carbonate uniformly in a ratio of Li:(Ni+Co+Al) of 1.05:1, calcining at 900℃ for 8h, cooling, crushing and sieving to obtain nickel cobalt Lithium aluminate cathode material.

[0028] LiNi 1-a-b Co a Al b O 2 Th...

Embodiment 2

[0031] According to the molar ratio of Ni:Co:Al of 0.8:0.15:0.05 to prepare a mixed aqueous solution of nickel nitrate, cobalt nitrate and aluminum nitrate nonahydrate with a total metal concentration of 1mol / L; prepare a mixture of NaOH and ammonia with a total concentration of 10mol / L Solution in which the molar ratio of NaOH and ammonia is 1:1.

[0032] Add the above two solutions to the reactor at a certain speed at the same time, control the pH of the reaction to 10, the reaction temperature to 50 ℃, and aging for 8 hours after 6 hours of reaction. After filtering, washing and drying, lithium nickel cobalt aluminate is obtained. Positive electrode material precursor.

[0033] After mixing the above-mentioned nickel cobalt lithium aluminate cathode material precursor and lithium carbonate uniformly in a ratio of Li:(Ni+Co+Al) of 1.05:1, calcining at 900℃ for 8h, cooling, crushing and sieving to obtain nickel cobalt Lithium aluminate cathode material.

[0034] LiNi 1-a-b Co a Al...

Embodiment 3

[0036] According to the molar ratio of Ni:Co:Al of 0.85:0.10:0.05, a mixed aqueous solution of nickel nitrate, cobalt nitrate and aluminum nitrate nonahydrate with a total metal concentration of 1mol / L was prepared; a mixture of NaOH and ammonia with a total concentration of 10mol / L was prepared Solution in which the molar ratio of NaOH and ammonia is 1:1.

[0037] Add the above two solutions to the reactor at a certain speed at the same time, control the pH value of the reaction to 11, the reaction temperature is 60 ℃, react for 6 hours and then age for 8 hours. After filtering, washing and drying, lithium nickel cobalt aluminate is obtained. Positive electrode material precursor.

[0038] After mixing the above-mentioned nickel cobalt lithium aluminate cathode material precursor and lithium carbonate uniformly in a ratio of Li:(Ni+Co+Al) of 1.08:1, calcining at 800℃ for 12h, cooling, pulverizing and sieving to obtain nickel cobalt Lithium aluminate cathode material.

[0039] LiNi...

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Abstract

The invention relates to a surface coating modified lithium ion battery cathode material and a preparation method thereof. The surface coating modified lithium ion battery cathode material has a general chemical formula of LiNi<1-a-b>CoaAlbO2/M, wherein a is more than 0.1 and less than 0.3, b is more than 0.01 and less than 0.2, and M refers to a coating layer. The material is coated by adopting a dry method; the coating layer refers to one or a mixture of two of lithium iron phosphate and lithium ferric manganese phosphate; and the mass ratio of the coating layer to LiNi<1-a-b>CoaAlbO2 is (0.01-0.2):1. The surface coating modified lithium ion battery cathode material and the preparation method thereof disclosed by the invention have the advantages that the stability of the cathode material is improved, and the safety performance of the material is improved; and moreover, in the dry-method coating process, waste liquor is not produced, high-temperature sintering is not needed, and the energy consumption and cost can be reduced.

Description

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Claims

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Application Information

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Owner ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
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