Lithium cobaltate for positive electrode of lithium ion battery and preparation method of lithium cobaltate for positive electrode of lithium ion battery

A lithium-ion battery, lithium cobalt oxide technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of not being able to improve the energy density of materials

Inactive Publication Date: 2014-12-24
PULEAD TECH IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this strategy of limiting the average valence state of metal elements is conducive to improving the cycle performance, it cannot improve the energy density of the material. If the purpose is to increa

Method used

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  • Lithium cobaltate for positive electrode of lithium ion battery and preparation method of lithium cobaltate for positive electrode of lithium ion battery
  • Lithium cobaltate for positive electrode of lithium ion battery and preparation method of lithium cobaltate for positive electrode of lithium ion battery
  • Lithium cobaltate for positive electrode of lithium ion battery and preparation method of lithium cobaltate for positive electrode of lithium ion battery

Examples

Experimental program
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Example Embodiment

[0031] Example 1

[0032] The synthetic ratio formula is Li 1.02 co 0.98 m 0.0167 o 2 Lithium cobaltate is for the purpose (wherein metal element M is made up of Mg, Ti two kinds of elements, and average valence is +2.4), the solid of cobalt hydroxide, lithium carbonate, magnesia and titania is provided by the atomic ratio provided in the proportional formula The powders were mixed by a known method, and the content of Co element in cobalt hydroxide as a cobalt source was 63.0%, and the average diameter of secondary particles was 8.0 μm.

[0033] Put the above mixture powder at 980°C, sinter under air flow for 10 hours, grind and crush the product after cooling down, pass through a 300-mesh sieve for particle size analysis, use a laser scattering particle size distribution measuring device, and use water as the dispersion medium. As a result of measurement, the average particle diameter D50 was 12.9 μm, D10 was 4.7 μm, and D90 was 31.9 μm. In the present invention, the co...

Example Embodiment

[0036] Example 2

[0037] In the synthetic ratio formula is LiCo 0.99 m 0.015 o 2 Lithium cobaltate is for the purpose (wherein the metal element M is Mg element, and the average valence state is +2), and the solid powder of tricobalt tetroxide, lithium hydroxide, and magnesium oxide is mixed by a known method according to the atomic ratio provided in the proportional formula, Co element content in cobalt tetraoxide as a cobalt source was 72.03%, and the average diameter of secondary particles was 5.5 μm.

[0038] Put the above mixture powder at 1200°C, sinter under air flow for 10 hours, grind and crush the product after cooling down, and conduct particle size analysis after passing through a 300-mesh sieve. It is 5.2 μm, and D90 is 45.9 μm. The compacted density is 3.8g / cm 3 .

Example Embodiment

[0039] Example 3

[0040] The synthetic ratio formula is Li 0.98 co 0.98 m 0.0381 o 2 Lithium cobaltate is the purpose (wherein the metal element M is composed of two elements, Ca and Zr, and the average valence state is +2.1), and cobalt oxyhydroxide, lithium carbonate, calcium carbonate, zirconium dioxide are mixed according to the atomic ratio provided in the proportional formula The solid powders are mixed by known methods. Cobalt oxyhydroxide as a cobalt source contained a Co element content of 62.8%, and an average diameter of secondary particles was 18 μm.

[0041] Put the above mixture powder at 1100°C, sinter under air flow for 20 hours, grind and crush the product after cooling down, and conduct particle size analysis after passing through a 300-mesh sieve. It is 7.2 μm, and D90 is 62.5 μm. The compacted density is 3.8g / cm 3 .

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Abstract

The invention discloses lithium cobaltate for a positive electrode of a lithium ion battery and a preparation method of the lithium cobaltate for the positive electrode of the lithium ion battery. The proportional formula of the lithium cobaltate prepared by adopting the method is shown as LixCoyMzO2, wherein M represents for one or two of transition metal elements except Co or alkaline earth metals elements; S represents for an average valence of all metal elements of the lithium cobaltate except lithium and cobalt; a mole ratio of four elements in the positive material-lithium cobaltate is x to y to 2 to 2; S is greater than or equal to +2 and less than +2.5; x is greater than or equal to 0.9 and less than or equal to 1.1; y is greater than or equal to 0.8 and less than or equal to 1.1; x plus 3y plus S*z is equal to 4. The lithium cobaltate prepared by adopting the method has the high volume capacity density, the high safety, the stable charge-discharge cycle performances and the high compaction density.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrode materials, and relates to lithium cobalt oxide used for the positive electrode of lithium-ion batteries and a preparation method thereof, in particular to lithium cobalt oxide with large volume capacity density, high safety, stable charge-discharge cycle performance, and high compaction density Lithium cobaltate used for positive pole of lithium ion battery, preparation method thereof, and positive pole of lithium ion battery containing prepared lithium cobaltate. Background technique [0002] In common lithium-ion battery cathode materials, such as lithium cobalt oxide LiCoO 2 , lithium nickelate LiNiO 2 , lithium manganese oxide LiMn 2 o 4 and lithium iron phosphate LiFePO 4 Among them, at present, only lithium cobalt oxide has achieved real large-scale industrial production due to its simple and easy synthesis method, high specific capacity and good cycle performance, and is wid...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/62
CPCH01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 武斌徐世国周恒辉
Owner PULEAD TECH IND
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