CoO/reduced graphene oxide composite negative pole material and preparation method thereof

A negative electrode material, graphene technology, applied in the field of CoO/reduced graphene oxide composite negative electrode material and its preparation, to achieve high conductivity, improve electrochemical performance, and shorten the distance

Active Publication Date: 2017-10-17
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structural design of the composite of CoO and carbon materials is a key part. Although carbon materials will provide high conductivity and stability, CoO itself should also have a smaller particle size, a stable structure, and a larger ratio. Surface area, in order to improve its electrochemical performance, there is no relevant technical report

Method used

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  • CoO/reduced graphene oxide composite negative pole material and preparation method thereof
  • CoO/reduced graphene oxide composite negative pole material and preparation method thereof
  • CoO/reduced graphene oxide composite negative pole material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1) Add 10mL of deionized water to 70mL of isopropanol, and configure it to 80mL of mixed solvent A;

[0045] 2) Add 0.5 mL of oleylamine and 0.5 mL of oleic acid to the mixed solvent A in a volume ratio of 1:1, and stir for 5 minutes to obtain a solution B;

[0046] 3) Take 1mmol of CoCl 2 ·6H 2 O, 10mmol of CO(NH 2 ) 2 , Add to solution B in sequence according to the molar ratio of 1:10, stir for 10 min to obtain solution C;

[0047] 4) Add 0.08 g of graphene oxide to solution C, and magnetically stir for 30 min to obtain suspension D;

[0048] 5) Ultrasonic treatment of suspension D for 8 hours;

[0049] 6) Put the ultrasonic suspension D in an oil bath, set the holding temperature to 90°C, and the holding time to 10h, and then naturally cool to room temperature to obtain precipitation E;

[0050] 7) Centrifuge the precipitate and wash it with absolute ethanol and hexane for 3 times, then put it in a vacuum drying oven at 70°C for 10 hours to obtain precursor F;

[0051] 8) Put t...

Embodiment 2

[0055] 1) Add 5 mL of deionized water to 75 mL of isopropanol, and configure it as 80 mL of mixed solvent A;

[0056] 2) Add 1 mL of oleylamine and 1 mL of oleic acid to the mixed solvent A in a volume ratio of 1:1, and stir for 5 minutes to obtain a solution B;

[0057] 3) Take 2mmol of CoCl 2 ·6H 2 O, 20mmol CO(NH 2 ) 2 , Add to solution B in sequence according to the molar ratio of 1:10, stir for 10min to obtain solution C;

[0058] 4) Add 0.12 g of graphene oxide to solution C, and magnetically stir for 40 minutes to obtain suspension D;

[0059] 5) Ultrasonic treatment of suspension D for 10 hours;

[0060] 6) Place the ultrasonic suspension D in an oil bath, set the holding temperature to 100°C, and the holding time to 8 hours, and then naturally cool to room temperature to obtain precipitation E;

[0061] 7) Centrifuge the precipitate and wash it with absolute ethanol and hexane for 4 times, then put it in a vacuum drying oven at 80°C and dry for 8 hours to obtain precursor F;

[0...

Embodiment 3

[0064] 1) Add 8 mL of deionized water to 72 mL of isopropanol and configure it to 80 mL of mixed solvent A;

[0065] 2) Add 1.5 mL of oleylamine and 1.5 mL of oleic acid to the mixed solvent A in a volume ratio of 1:1, and stir for 8 min to obtain solution B;

[0066] 3) Take 3mmol of CoCl 2 ·6H 2 O, 30mmol CO(NH 2 ) 2 , Add to solution B in sequence according to the molar ratio of 1:10, stir for 20 min to obtain solution C;

[0067] 4) Add 0.16 g of graphene oxide to solution C, and magnetically stir for 50 min to obtain suspension D;

[0068] 5) Ultrasonic treatment of suspension D for 12h;

[0069] 6) Put the ultrasonic suspension D in an oil bath, set the holding temperature to 110°C, and the holding time to 7h, and then naturally cool to room temperature to obtain precipitation E;

[0070] 7) Centrifuge the precipitate and wash it with absolute ethanol and hexane for 5 times, then put it in a vacuum drying oven at 90°C for 6 hours to obtain precursor F;

[0071] 8) Put the precursor ...

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Abstract

The invention relates to a CoO / reduced graphene oxide composite negative pole material and a preparation method thereof. The method includes: adding oleylamine and oleic acid into isopropanol solution to obtain A; adding a cobalt source and a precipitating agent into A, and well stirring to obtain B; adding graphene oxide into B, and well stirring to obtain C; subjecting C to ultrasonic treatment and oil bath reaction to generate a precipitate; separating out the precipitate, washing, drying, keeping the temperature for 0.5-2h in an atmosphere furnace at 300-500 DEG C, cooling to the room temperature to obtain the CoO / reduced graphene oxide composite negative pole material. The composite material is small in CoO particle size, lithium ion intercalation and deintercalation in a charging-discharging process are facilitated, and electrode specific capacity is increased; due to generation of dionaea muscipula shaped compound, maintaining of material stability is greatly facilitated, volume expansion of the material is decelerated, and electrochemical performances of the material are improved due to an auxiliary conductivity improving effect of carbon materials.

Description

Technical field [0001] The invention belongs to the field of negative electrode materials for ion batteries, and specifically relates to a CoO / reduced graphene oxide composite negative electrode material and a preparation method thereof. Background technique [0002] With the rapid development of lithium / sodium ion batteries, commercial carbon anode materials have been unable to meet market demand due to their low theoretical consumption and poor charge and discharge resistance. People urgently need to develop new anode materials to replace carbon anodes. material. Among them, transition metal oxides (such as CoO, Co 3 O 4 , Mn 3 O 4 , Fe 2 O 3 Etc.) Due to the higher theoretical specific capacity (600-1000mAh / g, about 2 to 3 times that of carbon materials), it has become a focus of research and attention in recent years. The charge-discharge mechanism of transition metal oxides is different from the lithium insertion / extraction mechanism of traditional materials. They can under...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/587H01M4/62B82Y30/00
CPCB82Y30/00H01M4/366H01M4/525H01M4/587H01M4/625Y02E60/10
Inventor 曹丽云康倩崔亚丽李嘉胤黄剑锋程娅伊
Owner SHAANXI UNIV OF SCI & TECH
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