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A kind of preparation method of composite positive electrode material for lithium battery

A positive electrode material and composite technology, which is applied in the field of preparation of composite positive electrode materials for lithium batteries, can solve problems such as uneven composition and unstable performance, achieve low equipment requirements, good coating or doping, and increase lamellae The effect of spacing

Active Publication Date: 2020-06-26
HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the current preparation of LiFePO 4 / Li 3 V 2 (PO 4 ) 3 The method of composite materials is mainly the complexation method, but the prepared composite materials have problems such as uneven composition and unstable performance.

Method used

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  • A kind of preparation method of composite positive electrode material for lithium battery
  • A kind of preparation method of composite positive electrode material for lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Add 1g graphene oxide and 500g deionized water into the reaction vessel, form a suspension after ultrasonic dispersion for 45 minutes, then add 2.5g cerium acetate, 0.625g potassium acetate, 0.75g urea to it, and continue ultrasonication for 1 Hours later, add ammonia water to the reaction vessel, adjust the pH to 8.0, and continue ultrasonication for 1 hour, then seal the reaction vessel, place it in an oven, react at 200°C for 24 hours, cool to room temperature, and rinse with deionized water After washing twice and drying, put it into a microwave oven and microwave at full power for 45 seconds to obtain a cerium oxide / graphene composite;

[0035] (2) 5.0g lithium hydroxide, 25.0g iron phosphate, 45.0g oxalic acid, 2.5g glucose, and 7.5g deionized water were added to the three-necked flask together, and then 0.775g cerium oxide was added to it, and under rapid stirring, Heated in a water bath to 80°C and kept for 3 hours, then lowered to room temperature, then vac...

Embodiment 2

[0039] (1) Add 1g of graphene oxide and 800g of deionized water into the reaction vessel, form a suspension after ultrasonic dispersion for 50 minutes, then add 3.0g of cerium acetate, 0.75g of potassium acetate, and 0.75g of urea to it, and continue ultrasonication for 1.5 Hours later, add ammonia water to the reaction vessel, adjust the pH to 8.5, and continue ultrasonication for 1.5 hours, then seal the reaction vessel, place it in an oven, react at 300°C for 36 hours, cool to room temperature, and rinse with deionized water After washing twice and drying, put it into a microwave oven and microwave at full power for 50 seconds to obtain a cerium oxide / graphene composite;

[0040] (2) Add 5.0g of lithium hydroxide, 25g of iron phosphate, 45g of oxalic acid, 3.0g of glucose, and 8g of deionized water into a three-necked flask, and then add 1.56g of Tm 2 o 3 , under rapid stirring, the water bath was heated to 80°C and kept for 4 hours, then lowered to room temperature, then ...

Embodiment 3

[0044] (1) Add 1g of graphene oxide and 1000g of deionized water into the reaction vessel, form a suspension after ultrasonic dispersion for 60 minutes, then add 5g of cerium acetate, 1.25g of potassium acetate, and 0.75g of urea to it, and continue ultrasonication for 2 hours Finally, add ammonia water to the reaction vessel, adjust the pH to 9.0, and continue ultrasonication for 2 hours, then seal the reaction vessel, place it in an oven, react at 250°C for 24 hours, cool to room temperature, and wash with deionized water 3 times, after drying, put it into a microwave oven, microwave at full power for 60 seconds, and obtain a cerium oxide / graphene composite;

[0045] (2) Add 5.0g of lithium hydroxide, 30.0g of iron phosphate, 50.0g of oxalic acid, 5.0g of glucose, and 10.0g of deionized water into a three-necked flask, and then add 4.5g of Sm 2 o 3 , under rapid stirring, the water bath was heated to 90°C and kept for 5 hours, then lowered to room temperature, and then vacu...

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Abstract

The invention discloses a preparation method of a composite type positive electrode material for a lithium battery. The preparation method comprises the following steps: ultrasonically dispersing graphene oxide into deionized water, adding cerium acetate, potassium acetate, urea and ammonia water into a container, and performing sealing, baking, drying and microwave treatment to prepare a cerium oxide / graphene compound; preparing rare earth metal ion doped lithium iron phosphate from raw materials such as lithium hydroxide, iron phosphate, oxalic acid, glucose and rare earth metal oxide; performing ultrasonic dispersion and ball milling on the cerium oxide / graphene compound, the rare earth metal ion doped lithium iron phosphate and ethanol to prepare cerium oxide / graphene rare earth metalion doped lithium iron phosphate; and performing stirring, microwave treatment and calcination on the raw materials such as the lithium hydroxide, ferric vanadate, phosphoric acid, deionized water andthe cerium oxide / graphene rare earth metal ion doped lithium iron phosphate to prepare the composite type positive electrode material for the lithium battery. The composite type positive electrode material prepared by the method has excellent electrical performance; moreover, the preparation method is clean and environment-friendly.

Description

technical field [0001] The invention relates to the fields of electrochemistry and new energy materials, in particular to a method for preparing a composite cathode material for lithium batteries. Background technique [0002] Lithium iron phosphate (LiFePO 4 ) has attracted much attention due to its rich source of raw materials, good stability and environmental friendliness. As a result, it has problems such as poor high-current charge-discharge performance and low-temperature discharge capacity. [0003] Lithium vanadium phosphate (Li 3 V 2 (PO 4 ) 3 ) and lithium iron phosphate (LiFePO 4 ) Compared with, it has a higher voltage platform. More importantly, Li 3 V 2 (PO 4 ) 3 Belonging to the fast ion conductor, it has a larger number of lithium ions (Li + ) for deintercalation, resulting in a ratio of LiFePO 4 More excellent electrical properties, but its high preparation cost limits its further commercial development in the field of battery materials. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 单升升
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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