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Lithium cobalt oxide mixed material with lithium balance as well as preparation method and detection method thereof

A technology of mixed materials and lithium cobalt oxide, which is applied in the direction of analysis materials, material excitation analysis, measurement devices, etc., and can solve the problems of inability to detect Li

Active Publication Date: 2020-12-29
PULEAD TAIAN TECH IND +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, the common pH method can only detect samples with a large amount of residual Li on the surface, and is not suitable for detecting samples with a Li / Me close to 1.00 and a small amount of residual Li on the surface, and the pH detection method cannot detect excess Li in the material lattice. Li
The XPS method (X-ray photoelectron spectroscopy) can detect all materials with Li / Me greater than, equal to and less than 1.00, but it can only analyze Li / Me with a thickness of several nanometers on the surface of the material, and it can only be semi-quantitative

Method used

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  • Lithium cobalt oxide mixed material with lithium balance as well as preparation method and detection method thereof
  • Lithium cobalt oxide mixed material with lithium balance as well as preparation method and detection method thereof
  • Lithium cobalt oxide mixed material with lithium balance as well as preparation method and detection method thereof

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Effect test

Embodiment 1

[0043] The lithium cobalt oxide mixed material is prepared by doping the Co precursor, and the chemical formula of the lithium cobalt oxide large particle is Li 1.03 co 0.97 al 0.03 o δ1 , the chemical formula of small lithium cobalt oxide particles is Li 0.97 co 0.97 al 0.03 o δ2 , the mass of the small particles accounts for 50% of the lithium cobaltate mixed material. Weigh and mix the large-particle doped Co precursor and lithium carbonate, calcinate the mixed powder in an air atmosphere, keep it at 1100°C for 5 hours, slowly lower it to room temperature, crush and sieve to obtain large particles of lithium cobaltate. Weigh and mix small particles of doped Co precursor and lithium carbonate, calcinate the mixed powder in an air atmosphere, keep warm at 850°C for 5 hours, slowly lower to room temperature, crush and sieve to obtain small particles of lithium cobaltate. Weigh and mix the size particles of lithium cobaltate, calcinate the mixed powder in the air atmosph...

Embodiment 2

[0046] The lithium cobalt oxide mixed material is prepared by doping the Co precursor, and the chemical formula of the lithium cobalt oxide large particle is Li 1.06 co 0.97 al 0.03 o δ1 , the chemical formula of small lithium cobalt oxide particles is Li 1.00 co 0.97 al 0.03 o δ2 , the mass of the small particles accounts for 50% of the lithium cobaltate mixed material. Weigh and mix the large-particle doped Co precursor and lithium carbonate, calcinate the mixed powder in an air atmosphere, keep it at 850°C for 10 hours, slowly lower it to room temperature, crush and sieve to obtain large lithium cobaltate particles. Weigh and mix small particles of doped Co precursor and lithium carbonate, calcinate the mixed powder in an air atmosphere, keep warm at 400°C for 4 hours, slowly lower to room temperature, crush and sieve to obtain small particles of lithium cobaltate. Weigh and mix the particles of lithium cobaltate size, calcinate the mixed powder in air atmosphere, ke...

Embodiment 3

[0049] The lithium cobalt oxide mixed material is prepared by doping the Co precursor, and the chemical formula of the lithium cobalt oxide large particle is Li 1.08 co 0.97 al 0.03 o δ1 , the chemical formula of small lithium cobalt oxide particles is Li 1.03 co 0.97 al 0.03 o δ2, the mass of the small particles accounts for 50% of the lithium cobaltate mixed material. Weigh and mix the large-particle doped Co precursor and lithium carbonate, calcinate the mixed powder in an air atmosphere, keep it at 1050°C for 15 hours, slowly lower it to room temperature, crush and sieve to obtain large particles of lithium cobaltate. Weigh and mix small particles of doped Co precursor and lithium carbonate, calcinate the mixed powder in an air atmosphere, keep it at 700°C for 1 hour, slowly lower it to room temperature, crush and sieve to obtain small particles of lithium cobaltate. Weigh and mix lithium cobalt oxide particles, calcinate the mixed powder in an air atmosphere, heat ...

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Abstract

The invention provides a lithium-balanced lithium cobalt oxide mixed material and preparation and detection methods thereof, belongs to the field of lithium ion battery positive electrode active materials. Large and small particles of lithium cobalt oxide are prepared through a doped Co precursor, or through a doped Co precursor and primary doping, or through a doped Co precursor, primary doping and secondary coating, so that the lithium-balanced lithium cobalt oxide mixed material is prepared. The material is formed by grading the large and small particles, the large particles are in a singlecrystal morphology, the small particles are in a single crystal morphology or an aggregate morphology, the preparation method is simple and convenient, Li / Me is controllable, and the electrical property is stable to play. The Li / Me value of the prepared lithium cobalt oxide mixed material is calculated through a detection method.

Description

technical field [0001] The invention belongs to the field of positive electrode active materials of lithium ion batteries, and relates to a lithium-balanced lithium cobaltate mixed material and a preparation and detection method thereof. Background technique [0002] Lithium cobalt oxide with a layered structure is a widely used cathode active material for consumer lithium batteries. Studies (Chem.Mater.2003,15,348-354) have proved that in the layered structure Li x CoO 2 In , the non-stoichiometric Li content has a significant impact on the crystal structure and electrical properties, and when Li is too small, Co 3 o 4 spinel phase, which reduces the energy density, and when there is too much Li, the metastable Co 3+ and oxygen vacancies, which are not conducive to structural stability. Therefore, for lithium cobaltate, in addition to modification methods such as doping and coating, the design and control of Li content is also necessary. In the patent TW201300320A app...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/525H01M10/0525G01N5/04G01N21/73G01N33/2022G01N33/2028
CPCH01M4/525H01M4/485H01M10/0525G01N33/2028G01N33/2022G01N21/73G01N5/04H01M2004/028H01M2004/021Y02E60/10
Inventor 李淼张继泉武斌李钊华姜晓瑞梁艳君周恒辉杨新河
Owner PULEAD TAIAN TECH IND