A kind of three-dimensional graphene loaded COO quantum dot composite electrode material and preparation method thereof

An electrode material, graphene technology, applied in hybrid capacitor electrodes, battery electrodes, nanotechnology for materials and surface science, etc., can solve problems such as complex process and impurities, achieve simple preparation process, speed up reaction rate, ease The effect of volume expansion

Active Publication Date: 2019-03-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of three-dimensional graphene by CVD is a relatively common method, but this method often needs to use foamed nickel as a template to deposit three-dimensional graphene on it, and then remove the foamed nickel by etching. Will bring unnecessary impurities, and the process is more complicated

Method used

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  • A kind of three-dimensional graphene loaded COO quantum dot composite electrode material and preparation method thereof
  • A kind of three-dimensional graphene loaded COO quantum dot composite electrode material and preparation method thereof
  • A kind of three-dimensional graphene loaded COO quantum dot composite electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1) Add 25mL deionized water to 35mL absolute ethanol to make 60mL mixed solvent A;

[0044] 2) Add 1mL oleylamine into the mixed solvent A, stir for 5min to obtain solution B;

[0045] 3) Take 0.5mmol of Co(CH 3 COO) 2 4H 2 O, 0.5mmolC 18 h 33 NaO 2 , 5mmol of CO(NH 2 ) 2 , according to the molar ratio of 1:1:10 were sequentially added to solution B, stirred for 10min to obtain solution C;

[0046] 4) 0.06g of graphene was added to solution C, and magnetically stirred for 30min to obtain suspension D;

[0047] 5) ultrasonically treat the suspension D for 2 h;

[0048] 6) Pour the ultrasonic suspension D into the polytetrafluoroethylene lining and then put it into the outer lining of the reaction kettle, seal it and place it in a microwave hydrothermal reactor, heat it from room temperature to 100°C, keep it warm for 6h, and then Cool naturally to room temperature to obtain precipitate E;

[0049] 7) Centrifuge the precipitate and wash it with ethanol for 3 ti...

Embodiment 2

[0055] 1) Add 20mL deionized water to 40mL absolute ethanol to make 60mL mixed solvent A;

[0056] 2) Add 2 mL of oleylamine into the mixed solvent A, stir for 5 min to obtain solution B;

[0057] 3) Take 1mmol of Co(CH 3 COO) 2 4H 2 O, 1mmolC 18 h 33 NaO 2 , 10mmol of CO(NH 2 ) 2 , according to the molar ratio of 1:1:10, sequentially added to solution B, stirred for 10-20min to obtain solution C;

[0058] 4) 0.08g of graphene was added to solution C, and magnetically stirred for 30min to obtain suspension D;

[0059] 5) ultrasonically treat the suspension D for 4 hours;

[0060] 6) Pour the ultrasonic suspension D into the polytetrafluoroethylene lining and put it into the outer lining of the reaction kettle, seal it and place it in a microwave hydrothermal reactor, heat it from room temperature to 120°C, keep it warm for 4h, and then Cool naturally to room temperature to obtain precipitate E;

[0061] 7) Centrifuge the precipitate and wash it with ethanol for 4 ti...

Embodiment 3

[0064] 1) Add 15mL deionized water to 45mL absolute ethanol to make 60mL mixed solvent A;

[0065] 2) Add 3mL oleylamine into the mixed solvent A, stir for 8min to obtain solution B;

[0066] 3) Take 1.5mmol of Co(CH 3 COO) 2 4H 2 O, 1.5mmolC 18 h 33 NaO 2 , 15mmol of CO(NH 2 ) 2 , according to the molar ratio of 1:1:10, sequentially added to solution B, stirred for 15min to obtain solution C;

[0067] 4) 0.1 g of graphene was added to solution C, and magnetically stirred for 50 min to obtain suspension D;

[0068] 5) ultrasonically treat the suspension D for 6 h;

[0069]6) Pour the ultrasonic suspension D into the polytetrafluoroethylene lining and then put it into the outer lining of the reaction kettle, seal it and place it in a microwave hydrothermal reactor, heat it from room temperature to 140°C, keep it warm for 6h, and then Cool naturally to room temperature to obtain precipitate E;

[0070] 7) Centrifuge the precipitate and wash it with ethanol for 5 times...

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Abstract

The invention relates to a three-dimensional graphene-supported CoO quantum dot composite electrode material and its preparation method. The method includes in the volume ratio of (1 ~ 5): 60, adding the oil amine to an ethanol solution to obtain A; adding the cobalt salt, C18H33NaO2 and a precipitant agent to A, and uniformly stirring to obtain B; adding graphene oxide to B and uniformly stirring to obtain C; performing the ultrasonic processing on C, and then performing microwave hydro-thermal reaction to generate a sediment; and separating the sediment, washing, and drying, insulating for 1-3h in an atmosphere furnace at the temperature of 300-500 DEG C, cooling to the room temperature, and obtaining the three-dimensional graphene-supported CoO quantum dot composite electrode material. The size of the obtained CoO quantum dots is small, so that the rapid transmission of electrons is facilitated, the reaction rate during charging and discharging is accelerated, and the reactive sites are increased. The network structure of the three-dimensional graphene alleviates the volume expansion caused by the ion intercalation and deintercalation in the charging and discharging process, the CoO particles are protected, and the material structure is stabilized.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a lithium ion battery, in particular to a three-dimensional graphene-loaded CoO quantum dot composite electrode material and a preparation method thereof. Background technique [0002] Since the 1990s, with the rapid development of integrated circuits and electronic information technology, various portable electronic devices (such as mobile phones, notebook computers, etc.) The needs of the times have greatly promoted the development of safe, environmentally friendly, low-cost, high specific energy and long cycle life secondary battery technology. Lithium-ion battery, as a new type of energy storage device, has attracted more and more attention due to its advantages such as high energy density, long cycle life, small size of electrode materials, almost no pollution to the environment and high safety performance. , is considered to be a promising portable energy storage d...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01G11/50H01M4/36H01M4/525H01M4/62H01M10/0525H01G11/36H01G11/46B82Y30/00
CPCB82Y30/00H01G11/36H01G11/46H01G11/50H01M4/366H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor曹丽云康倩王瑞谊李嘉胤黄剑锋程娅伊
OwnerSHAANXI UNIV OF SCI & TECH