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Lithium cobalt oxide composite material and preparation method thereof

A composite material, lithium cobalt oxide technology, applied in the direction of active material electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor stability and poor conductivity

Active Publication Date: 2021-06-08
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a lithium cobalt oxide composite material and a preparation method thereof, which are used to solve the problems of poor stability and poor conductivity in existing coating materials

Method used

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  • Lithium cobalt oxide composite material and preparation method thereof
  • Lithium cobalt oxide composite material and preparation method thereof
  • Lithium cobalt oxide composite material and preparation method thereof

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preparation example Construction

[0054] According to other embodiments of the present invention, the nanoscale lithium-deficient lithium cobalt phosphate Li x CoPO 4 (0.3<x<0.7) preparation method comprises the following steps:

[0055] (1) Lithium nitrate 0.15-1.7mol / L cobalt nitrate salt mixed solution of configuration 0.1-0.5mol / L, the amount of cobalt nitrate substance is 1.5~3 times of lithium nitrate, pH value is adjusted to 4.5-5.5, obtains solution A, standby;

[0056] (2) Configure a mixed solution of 0.1-0.5mol / L phosphoric acid and 0.1-0.5mol / L sodium N-acyl sarcosine, the amount of phosphoric acid is 1.5 to 3 times that of sodium N-acyl sarcosine to obtain solution B ;

[0057] (3) Solution A and solution B are mixed in equal volumes, and subjected to hydrothermal treatment at a temperature of 100-150° C. for 6-8 hours; a solid material is obtained after washing and drying;

[0058] (4) Sintering the obtained solid material, the sintering temperature is 500-700°C, and the sintering time is 3-6...

Embodiment 1

[0069] Step 1: Preparation of lithium-deficient lithium cobalt phosphate

[0070] Dissolve 0.1 mol of lithium nitrate and 0.3 mol of cobalt nitrate in 1L of deionized water, adjust the pH to 5.5, then add 0.3 mol of phosphoric acid and 0.1 mol of sodium N-acyl sarcosine to it, and conduct a hydrothermal reaction at 100°C for 6 hours. Cool and dry after the end to obtain a solid precursor; pre-burn the precursor at 180°C for 2 hours in a nitrogen environment, then raise the temperature to 700°C at a rate of 5°C / min, and sinter at a constant temperature for 3 hours to obtain lithium-deficient cobalt phosphate Lithium Li 0.33 CoPO 4 . Lithium-deficient cobalt phosphate lithium Li 0.33 CoPO 4 Pulverized to obtain nano-scale lithium-deficient lithium cobalt phosphate Li 0.33 CoPO 4 .

[0071] The second step: preparation of lithium cobalt oxide composite material

[0072] Take 500g of matrix lithium cobaltate, and take 0.2g of pulverized lithium-deficient lithium cobalt pho...

Embodiment 2

[0086] Step 1: Preparation of lithium-deficient lithium cobalt phosphate

[0087] Dissolve 0.1 mol of lithium nitrate and 0.10 mol of cobalt nitrate in 1L of deionized water, adjust the pH to 5.0, then add 0.15 mol of phosphoric acid and 0.1 mol of sodium N-acyl sarcosine to it, and conduct a hydrothermal reaction at 120°C for 8 hours. Cool and dry after the end to obtain a solid precursor; pre-burn the precursor at 180°C for 2 hours in a nitrogen environment, then raise the temperature to 500°C at a rate of 3°C / min, and sinter at a constant temperature for 3 hours to obtain lithium-deficient cobalt lithium phosphate Li 0.66 CoPO 4 . Lithium-deficient cobalt phosphate lithium Li 0.66 CoPO 4 Pulverized to obtain nano-scale lithium-deficient lithium cobalt phosphate Li 0.66 CoPO 4 .

[0088] The second step: preparation of lithium cobalt oxide composite material

[0089] Take 500g of matrix lithium cobaltate, and take 0.10g of pulverized lithium-deficient cobalt lithium ...

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Abstract

The invention provides a lithium cobalt oxide composite material and a preparation method thereof. The lithium cobalt oxide composite material comprises a matrix and a coating layer, wherein the matrix comprises lithium cobalt oxide; and the coating layer comprises lithium-deficient cobalt lithium phosphate, and the surface of the substrate is coated with the lithium-deficient cobalt lithium phosphate. According to the lithium cobalt oxide composite material, the lithium cobalt oxide composite material containing the coating layer is synthesized by carrying out coating treatment on nanoscale lithium-deficient lithium phosphate. The composite material is used as a positive electrode material, compared with a base material, the capacity is not lost under the condition that the cycle performance and the storage performance are improved; compared with lithium cobalt oxide coated with lithium cobalt phosphate, the conductivity is higher, so that the electric specific capacity is higher, and the cycle performance is better; and compared with lithium cobalt oxide coated with lithium cobalt phosphate, the surface is more stable, so that the high-temperature storage performance and the high-temperature cycle performance are better.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium cobalt oxide composite material and a preparation method thereof. Background technique [0002] At present, the research hotspots of 3C consumer lithium batteries mainly focus on high energy density and high rate, especially high energy density is highly related to the performance of cathode materials. In order to increase the energy density, the charging cut-off voltage is continuously increased during battery use. However, when the positive electrode material with high delithiation state makes the battery have a higher volume / mass energy density, it will show stronger oxidation, and it is easier to produce irreversible phase transition, oxygen precipitation, transition metal dissolution and cracks, etc., resulting in Material failure. [0003] Coating appropriate substances in the material improvement method can effectively improve the dissolution of transition me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/58H01M10/0525
CPCH01M4/364H01M4/366H01M4/525H01M4/5825H01M10/0525H01M2004/028Y02E60/10
Inventor 曾家江于丽秋李素丽
Owner ZHUHAI COSMX BATTERY CO LTD
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