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High-content element uniformly-doped lithium cobalt oxide precursor and preparation method thereof

A technology of content elements and precursors, which is applied in the field of lithium cobaltate precursors uniformly doped with high content elements and its preparation, can solve the problems of uniform doping of aluminum elements, uncharacterized availability, and complicated operations, and achieve reduction The risk of secondary nucleation, the effect of increasing the reaction rate and ensuring uniformity

Pending Publication Date: 2022-06-03
XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its operation is complicated, and the uniformity and effectiveness of aluminum element doping have not been characterized.

Method used

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  • High-content element uniformly-doped lithium cobalt oxide precursor and preparation method thereof
  • High-content element uniformly-doped lithium cobalt oxide precursor and preparation method thereof
  • High-content element uniformly-doped lithium cobalt oxide precursor and preparation method thereof

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preparation example Construction

[0045] In the preparation process of the lithium cobalt oxide precursor material, when it meets one or more of the following conditions, the prepared lithium cobalt oxide precursor can have better quality:

[0046] The concentration of cobalt solution is 100g / L-150g / L;

[0047] Metal salt solution, wherein the metal is one or more of Mg, Al, Zr, La, Y, Ni, Mn, Cr, V, Ti;

[0048] The metal concentration of the doped metal salt is 10g / L-40g / L;

[0049] The alkaline solution is an aqueous solution of ammonium bicarbonate or sodium carbonate;

[0050] The concentration of alkali solution is 130-240g / L;

[0051] In step 2, the pH value of the first bottom liquid is 7.5 to 8.5;

[0052] In step 2, the alkalinity of the first bottom liquid is 0.25~0.35mol / L;

[0053] The precipitation temperature in step 2 is 30~40 ℃;

[0054] In step 2, the stirring speed is 190~230rpm;

[0055] In step 2, the pH value of the precipitation is 7.0-8.0.

[0056] The seed grain size of the coba...

Embodiment 1

[0072] Step 1: Preparation of raw materials. Prepare a cobalt chloride solution with a metal concentration of 100 g / L, an ammonium bicarbonate solution with a metal concentration of 130 g / L, and an aluminum sulfate solution with a metal concentration of 10 g / L, for subsequent use.

[0073] Step 2: Preparation of cobalt carbonate seed crystals. Deionized water and ammonium bicarbonate solution were added to the reaction kettle, and the temperature was raised to 30° C. of the reaction kettle to obtain a first bottom liquid with a pH value of 7.55 and an alkalinity of 0.252 mol / L. The stirring speed is 190rpm, then the metering pump of cobalt chloride, ammonium bicarbonate and aluminum sulfate feed liquid is turned on to start feeding, the flow rate of cobalt chloride is 50L / h, the flow rate of aluminum sulfate is 5L / h, and the flow rate of ammonium bicarbonate is adjusted to control The pH value of the reactor was 7.0. The precipitation process uses positive pressure micropore...

Embodiment 2

[0078] Step 1: Preparation of raw materials. A cobalt chloride solution with a metal concentration of 150 g / L, a sodium carbonate solution with a metal concentration of 240 g / L, and a lanthanum chloride solution with a metal concentration of 40 g / L were prepared for subsequent use.

[0079] Step 2: Preparation of cobalt carbonate seed crystals. Add deionized water and sodium carbonate solution to the reaction kettle, be warming up to 40 ℃ of reaction kettle temperature, obtain the bottom liquid whose pH value is 8.44, and alkalinity is 0.347mol / L. The stirring speed is 230rpm, then the metering pump of cobalt chloride, sodium carbonate and lanthanum chloride feed liquid is turned on to start feeding, the flow rate of cobalt chloride is 50L / h, the flow rate of lanthanum chloride is 1.87 / h, and the flow rate of sodium carbonate is adjusted to control The pH value of the reactor was 8.0. The precipitation process uses positive pressure micropores to concentrate the slurry. Whe...

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Abstract

The invention relates to a high-content element uniformly-doped lithium cobalt oxide precursor and a preparation method thereof, the structural formula of the lithium cobalt oxide precursor is CoxMyO4, x is more than or equal to 0.95 and less than 1, y is more than 0 and less than or equal to 0.05, M represents a doped metal, the crystal system is a cubic system, the space group is F-43m, the unit cell parameter a value of the lithium cobalt oxide precursor is between 8.07 and 8.12, and the unit cell parameter b value of the lithium cobalt oxide precursor is more than 0 and less than 1. The true density is between 6.02 g / cm < 3 > and 6.10 g / cm < 3 >.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium cobalt oxide precursor homogeneously doped with high-content elements and a preparation method thereof. Background technique [0002] In lithium-ion battery technology, lithium cobalt oxide materials have the advantages of high energy storage density, high power density, good cycle performance, small self-discharge, no memory effect, good safety, and environmental friendliness. It is difficult to replace in the 3C and portable fields. status. However, with the increase of people's demand, the requirements for lithium cobalt oxide materials are also increasing, especially the stability of lithium cobalt oxide materials under high voltage and high temperature. [0003] In order to achieve the stability of lithium cobalt oxide materials at high voltage and high temperature, the purpose of stabilizing the material structure can be achieved by doping effective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04C01G51/00H01M4/525H01M10/0525
CPCC01G51/04C01G51/42C01G51/70H01M4/525H01M10/0525C01P2002/72C01P2002/77C01P2004/03C01P2004/61C01P2004/80C01P2004/32Y02E60/10
Inventor 曾雷英范勇谢文彬叶文虎刘煜旻张见
Owner XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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