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Nano copper oxalate composite three-dimensional graphene anode material as well as preparation method and application thereof

A graphene negative electrode and nanograss technology, applied in chemical instruments and methods, carbon compounds, battery electrodes, etc., can solve the problems of low coulombic efficiency, irreversible specific capacity loss, coulombic efficiency of only 50% to 70%, etc., to achieve preparation The process is simple, the Coulomb efficiency is improved, and the effect of breaking through the technical bottleneck

Active Publication Date: 2020-03-27
上海昱瓴新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the complexity of the microstructure of carbonaceous materials, the relationship between the material structure and the electrochemical performance of the electrode restricts the development of high-performance lithium-ion batteries
The lithium salt electrolyte forms a passivation film (SEI film) on the surface of the carbon negative electrode, so that the Coulombic efficiency of the three-dimensional graphene electrode is only 50% to 70% during the first charge and discharge process, and the irreversible specific capacity loss is as high as 30% to 50%.
Therefore, the low Coulombic efficiency of graphene-based anode materials is a bottleneck problem restricting its practical application.

Method used

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  • Nano copper oxalate composite three-dimensional graphene anode material as well as preparation method and application thereof
  • Nano copper oxalate composite three-dimensional graphene anode material as well as preparation method and application thereof
  • Nano copper oxalate composite three-dimensional graphene anode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The preparation process of a set of nano-copper oxalate composite three-dimensional graphene anode materials:

[0021] S1: Weigh 1g of metal lithium in an inert gas glove box and put it into a ceramic boat, quickly put the ceramic boat into the tube furnace, and evacuate the tube furnace to 10Pa;

[0022] S2: Fill the tube furnace with carbon dioxide gas to 0.4Mpa, then heat the tube furnace to 550°C at a rate of 5°C per minute and keep it for 24 hours to obtain a crude three-dimensional graphene product;

[0023] S3: crushing the crude three-dimensional graphene product obtained in S2 to a size above 100 mesh;

[0024] S4: Put the powdered three-dimensional graphene crude product obtained in S3 into concentrated nitric acid with a concentration of 68%, soak for 12 hours, and make the mass ratio of the three-dimensional graphene crude product to concentrated nitric acid reach 1:5;

[0025] S5: After adding copper powder to the suspension obtained in S4 and fully stirri...

Embodiment 2

[0029] The preparation process of a set of nano-copper oxalate composite three-dimensional graphene anode materials:

[0030] S1: Weigh 1g of metal lithium in an inert gas glove box and put it into a ceramic boat, quickly put the ceramic boat into the tube furnace, and evacuate the tube furnace to 10Pa;

[0031] S2: Fill the tube furnace with carbon dioxide gas to 0.4Mpa, then heat the tube furnace to 600°C at a rate of 8°C per minute and keep it for 36h to obtain a crude three-dimensional graphene product;

[0032] S3: crushing the crude three-dimensional graphene product obtained in S2 to a size above 100 mesh;

[0033] S4: Put the powdery three-dimensional graphene crude product obtained in S3 into concentrated nitric acid with a concentration of 68%, soak for 12 hours, and make the mass ratio of the three-dimensional graphene crude product to concentrated nitric acid reach 1:4;

[0034]S5: After adding copper sulfate to the suspension obtained in S4 and fully stirring, th...

Embodiment 3

[0038] The preparation process of a set of nano-copper oxalate composite three-dimensional graphene anode materials:

[0039] S1: Weigh 1g of metal lithium in an inert gas glove box and put it into a ceramic boat, quickly put the ceramic boat into the tube furnace, and evacuate the tube furnace to 10Pa;

[0040] S2: Fill the tube furnace with carbon dioxide gas to 0.5Mpa, then heat the tube furnace to 575°C at a rate of 10°C per minute and keep it for 48 hours to obtain a crude three-dimensional graphene product;

[0041] S3: crushing the crude three-dimensional graphene product obtained in S2 to a size above 100 mesh;

[0042] S4: Put the powdered three-dimensional graphene crude product obtained in S3 into concentrated nitric acid with a concentration of 68%, soak for 12 hours, and make the mass ratio of the three-dimensional graphene crude product to concentrated nitric acid reach 1:4.5;

[0043] S5: After adding copper carbonate to the suspension obtained in S4 and fully ...

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Abstract

The invention discloses a nano copper oxalate composite three-dimensional graphene anode material as well as a preparation method and application thereof. The method comprises the following steps: S1,putting a lithium sheet into a tubular furnace, and vacuumizing the tubular furnace; and S2, introducing carbon dioxide gas into the tubular furnace, heating the tubular furnace to obtain a three-dimensional graphene crude product; S3, crushing the three-dimensional graphene crude product into powder; S4, putting the powdery three-dimensional graphene crude product into concentrated nitric acid,and continuously soaking for more than 2 hours; S5, adding metal copper powder or copper salt into the turbid liquid, and fully stirring; S6, slowly dropwise adding absolute ethyl alcohol into the turbid liquid and continuously stirring; and S7, sequentially filtering, washing and drying the product obtained in the step S6 to obtain the nano copper oxalate composite three-dimensional graphene anode material. According to the invention, nano copper oxalate is compounded on the surface of the three-dimensional graphene anode material, so that the coulombic efficiency of the obtained three-dimensional graphene anode material is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a nano-copper oxalate composite three-dimensional graphene negative electrode material and a preparation method and application thereof. Background technique [0002] At present, under the new situation of depletion of fossil energy, serious environmental pollution and global warming. The world's energy development trend has shifted from the development of new energy to the development of new energy storage systems. The development of new green energy storage devices with high energy density and high power density to replace traditional energy storage and transportation systems is an urgent task for all energy-consuming countries in the world. Compared with traditional batteries, lithium-ion batteries have higher energy density, longer cycle life and better safety in use. Graphene has many excellent properties such as high electrical conductivity, high thermal con...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525C01B32/00
CPCC01B32/00H01M4/362H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 王磊邓俊涛刘萍徐怀良陈辉常凯铭高瑞星万文文
Owner 上海昱瓴新能源科技有限公司
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