A method for surface doping modified lithium cobalt oxide cathode material

A positive electrode material and surface doping technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of lithium ion diffusion coefficient and low electrical conductivity, unfavorable material rate performance of the coating layer, etc.

Active Publication Date: 2022-04-05
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface modification of lithium cobalt oxide by coating the surface of the material with oxides, phosphates, and fluorides can greatly improve the interface of the electrochemical reaction of the material and improve the cycle performance of the material. However, the lithium ion diffusion coefficient of the coated material is generally and electrical conductivity are relatively low, the existence of this coating layer may be detrimental to the rate performance of the material

Method used

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  • A method for surface doping modified lithium cobalt oxide cathode material
  • A method for surface doping modified lithium cobalt oxide cathode material
  • A method for surface doping modified lithium cobalt oxide cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Take three clean and dry crucibles, put 0.002mol CaS and 0.007mol deionized water into the two crucibles respectively, and place them at the bottom of the hydrothermal reaction kettle.

[0069] Put 0.5mol lithium cobaltate in the crucible, place the crucible in the reaction kettle, in which, the lithium cobaltate should be evenly spread on the bottom of the crucible as thin as possible, and the crucible with lithium cobaltate should be placed higher than the other two A crucible 10cm. After carefully sealing the hydrothermal reaction kettle, place it in an oven for hydrothermal reaction. The condition of the hydrothermal reaction is constant temperature treatment at 90° C. for 6 hours.

[0070] After the hydrothermal reaction is over, take out the crucible in the hydrothermal reaction kettle after natural cooling, take out the reaction product in the crucible containing lithium cobaltate, wash the reaction product with absolute ethanol for many times and dry it to obtai...

Embodiment 2

[0072] Take three clean and dry crucibles, put 0.001mol CaS and 0.007mol deionized water into the two crucibles respectively, and place them at the bottom of the hydrothermal reaction kettle.

[0073] Put 0.5mol lithium cobaltate in the crucible, place the crucible in the reaction kettle, in which, the lithium cobaltate should be evenly spread on the bottom of the crucible as thin as possible, and the crucible with lithium cobaltate should be placed higher than the other two A crucible 10cm. After carefully sealing the hydrothermal reaction kettle, place it in an oven for hydrothermal reaction. The condition of the hydrothermal reaction is constant temperature treatment at 90° C. for 6 hours.

[0074] After the hydrothermal reaction is over, take out the crucible in the hydrothermal reaction kettle after natural cooling, take out the reaction product in the crucible containing lithium cobaltate, wash the reaction product with absolute ethanol for many times and dry it to obtai...

Embodiment 3

[0076] Take three clean and dry crucibles, put 0.002mol CaS and 0.007mol deionized water into the two crucibles respectively, and place them at the bottom of the hydrothermal reaction kettle.

[0077] Put 0.8mol lithium cobaltate in the crucible, place the crucible in the reaction kettle, in which, the lithium cobaltate should be evenly spread on the bottom of the crucible as thin as possible, and the crucible with lithium cobaltate should be placed at a higher height than the other two A crucible 10cm. After carefully sealing the hydrothermal reaction kettle, place it in an oven for hydrothermal reaction. The condition of the hydrothermal reaction is constant temperature treatment at 90° C. for 6 hours.

[0078] After the hydrothermal reaction is over, take out the crucible in the hydrothermal reaction kettle after natural cooling, take out the reaction product in the crucible containing lithium cobaltate, wash the reaction product with absolute ethanol for many times and dry...

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Abstract

The invention discloses a method for surface doping modified lithium cobaltate positive electrode material and the positive electrode material prepared by the method. The method comprises the following steps: step 1, placing raw material sulfur source and solvent in a reaction kettle; step 2 1. Place the lithium cobaltate in the reaction kettle, place the reaction kettle in the reaction environment, and carry out the reaction; step 3, after the reaction, take out the product in the reaction kettle, and obtain the surface-doped modified lithium cobaltate positive electrode material after post-processing . The present invention adopts the in-situ vapor phase hydrothermal method to carry out surface doping modification on lithium cobaltate, and obtains a surface-doped modified lithium cobaltate positive electrode material with stable structure and excellent electrochemical performance. The method is simple and efficient, and the prepared positive electrode The material can meet the practical needs of lithium-ion batteries.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a method for modifying a lithium cobalt oxide cathode material. Background technique [0002] Lithium-ion batteries have the characteristics of high working voltage, high energy density, good cycle performance, low self-discharge rate, and environmental friendliness. They have been widely used in 3C digital, energy storage power stations, electric vehicles and other fields. The performance of a lithium-ion battery is mainly determined by its cathode material. Lithium cobaltate cathode material is currently commercialized and the most widely used lithium ion cathode material. Lithium cobaltate cathode material has mature production technology, easy synthesis, high working voltage, suitable for high current charge and discharge, stable charge and discharge voltage, relatively High energy advantages. However, the safety performance and cycle performance of lithium ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525
CPCH01M4/362H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 刘海强
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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