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A kind of COO/reduced graphene oxide composite negative electrode material and preparation method thereof

A negative electrode material and graphene technology, which is applied in the field of CoO/reduced graphene oxide composite negative electrode material and its preparation, and achieves the effects of small size, simple and mild preparation process, and high electrical conductivity

Active Publication Date: 2019-12-10
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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  • A kind of COO/reduced graphene oxide composite negative electrode material and preparation method thereof
  • A kind of COO/reduced graphene oxide composite negative electrode material and preparation method thereof
  • A kind of COO/reduced graphene oxide composite negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1) Add 10mL deionized water into 70mL isopropanol to make 80mL mixed solvent A;

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

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

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

[0048] 5) ultrasonically treat the suspension D for 8 hours;

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

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

Embodiment 2

[0055] 1) Add 5mL deionized water into 75mL isopropanol to make 80mL mixed solvent A;

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

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

[0058] 4) 0.12g of graphene oxide was added to solution C, and magnetically stirred for 40min to obtain suspension D;

[0059] 5) ultrasonically treat the suspension D for 10 h;

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

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

[0...

Embodiment 3

[0064] 1) Add 8mL deionized water to 72mL isopropanol to make 80mL mixed solvent A;

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

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

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

[0068] 5) ultrasonically treat the suspension D for 12 hours;

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

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

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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 ion battery negative electrode materials, and in particular 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, commercially used carbon-based anode materials have been difficult to meet the market demand due to their low theoretical dosage and poor charge-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 its high theoretical specific capacity (600-1000mAh / g, about 2-3 times that of carbon materials), it has become a hot spot of research and attention in recent years. The charging and discharging mechanism of transition metal oxides is different from the lithium intercalation / extraction mechanism of traditiona...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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