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A lithium ion battery cathode material and a preparing method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor lithium-ion conductivity, improve volumetric energy density, improve lithium-ion conductivity, and avoid uneven adsorption Effect

Inactive Publication Date: 2015-07-01
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the coated metal oxide is a non-electrochemically active material and has poor lithium ion conductivity, the gram capacity and discharge voltage platform of lithium cobalt oxide will be sacrificed after coating, thus sacrificing the energy density of lithium cobalt oxide to a certain extent.

Method used

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  • A lithium ion battery cathode material and a preparing method thereof
  • A lithium ion battery cathode material and a preparing method thereof
  • A lithium ion battery cathode material and a preparing method thereof

Examples

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Embodiment 1

[0041] This embodiment provides a lithium battery positive electrode material, which includes an inner core and a cladding layer. The core structure is lithium cobalt oxide LiCoO 2 , the particle size is 15um, and the cladding structure is LiNi 0.8 mn 0.2 PO 4 , accounting for 2% by mass of the entire positive electrode material, and the thickness of the coating layer is 0.5um.

[0042] The preparation method is as follows:

[0043] Dissolve nickel sulfate and manganese sulfate according to the metal molar ratio of 0.80:0.20 to obtain a 2.0mol / L mixed salt solution, and 100g lithium cobaltate LiCoO 2 Add to 30ml mixed salt solution to form a slurry mixture, then add the mixture to (NH 4 ) 2 HPO 4 Fully stir the reaction in the solution, heat treatment at 400°C for 2 hours to obtain LiNi 0.8 mn 0.2 PO 4 Coated LiCoO 2 cathode materials for lithium batteries.

Embodiment 2

[0045] This embodiment provides a lithium battery positive electrode material, which includes an inner core and a cladding layer. The core structure is doped lithium cobalt oxide LiCo 0.8 Ni 0.2 o 2 , the particle size is 8um, and the cladding structure is LiNi 0.9 Al 0.1 PO 4 , accounting for 0.1% by mass of the entire positive electrode material, and the thickness of the coating layer is 0.01um.

[0046] The preparation method is as follows:

[0047] Dissolve nickel chloride and aluminum nitrate according to the metal molar ratio of 0.90:0.10 to obtain a 4.0mol / L mixed salt solution, and 100g doped lithium cobaltate LiCo 0.8 Ni 0.2 o 2 Add to 30ml mixed salt solution to form a slurry mixture, then add the mixture to NH 4 h 2 PO 4 Fully stir the reaction in the solution, heat treatment at 500°C for 1.5 hours to obtain LiNi 0.9 Al 0.1 PO 4 Coated LiCo 0.8 Ni 0.2 o 2 cathode materials for lithium batteries.

Embodiment 3

[0049] This embodiment provides a lithium battery positive electrode material, which includes an inner core and a cladding layer. The core structure is doped lithium cobalt oxide LiCo 0.9 Mg 0.1 o 2 , the particle size is 18um, and the cladding structure is LiMn 0.8 Fe 0.2 PO 4 , accounting for 5% by mass of the entire positive electrode material, and the thickness of the coating layer is 1um.

[0050] The preparation method is as follows:

[0051] Dissolve manganese sulfate and ferric nitrate according to the metal molar ratio of 0.80:0.20 to obtain a 0.1mol / L mixed salt solution, and 100g doped lithium cobaltate LiCo 0.9 Mg 0.1 o 2 Add to 30ml mixed salt solution to form a slurry mixture, then add the mixture to (NH 4 ) 3 PO 4 Fully stir the reaction in the solution, heat treatment at 800°C for 1 hour to obtain LiMn 0.8 Fe 0.2 PO 4 Coated LiCo 0.9 Mg 0.1 o 2 cathode materials for lithium batteries.

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Abstract

The invention discloses a lithium ion battery cathode material and a preparing method thereof, and particularly relates to a phosphate-coated lithium ion battery cathode material and a preparing method thereof. The chemical constitution of a coating layer is M1M2PO4, wherein the M1 is Ni, Mn and Co, and the M2 is Cr, Al, Mg, Fe, Ti, V, Ga, Cu, Zn, Be, Sc, Ca, Sr, Ba, Zr, Li and La. The cathode material can be normally used under a high cut-off voltage for charging (4.4-4.7 V), and has high thermal stability. A lithium ion battery using the cathode material has a higher volume energy density and better cycle performance. The preparing method of the cathode material includes mixing a cathode material core and a salt solution at least comprising Ni, Mn or Co, adding a phosphate, reacting, forming the phosphate coating layer at least comprising the Ni, the Mn or the Co on at least a part of the surface of the cathode material, and performing heat treatment to obtain the lithium ion battery cathode material.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, and in particular relates to a lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] As consumer electronic products such as mobile phones and tablet computers are increasingly becoming lighter and thinner, cathode materials with higher energy density have gradually become a hot spot in the research of lithium-ion batteries, and volumetric energy density = discharge capacity * discharge voltage platform * compaction density, Therefore, the effective way to increase the energy density is to increase the charge cut-off voltage of the battery, increase the discharge capacity, and then increase the volumetric energy density of the battery. [0003] At present, lithium cobalt oxide is a commonly used positive electrode material for lithium-ion batteries, but the gram capacity of lithium cobalt oxide under high voltage above 4...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525
CPCH01M4/364H01M4/366H01M4/505H01M4/525H01M4/624H01M10/0525Y02E60/10
Inventor 陈彦彬李珊珊王汝娜刘亚飞
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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