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Carbon nanotube-carbon nanosheet-germanium composite negative electrode material and preparation method and application thereof

A carbon nanosheet and carbon nanotube technology, which is applied in the field of carbon nanotube-carbon nanosheet-germanium composite negative electrode material and its preparation field, can solve the problems of poor electrochemical activity and large volume expansion effect of germanium negative electrode, and achieves low price. , easy to obtain, simple preparation process

Active Publication Date: 2022-03-29
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a carbon nanotube-carbon nanosheet-germanium composite negative electrode material and its preparation method and application, which are used to overcome the defects of poor electrochemical activity and large volume expansion effect of the germanium negative electrode in the prior art.

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  • Carbon nanotube-carbon nanosheet-germanium composite negative electrode material and preparation method and application thereof
  • Carbon nanotube-carbon nanosheet-germanium composite negative electrode material and preparation method and application thereof

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preparation example Construction

[0020] The present invention proposes a method for preparing a carbon nanotube-carbon nanosheet-germanium composite negative electrode material, comprising the following steps:

[0021] S1: Ball mill the sodium salt of an organic acid, heat-treat in an inert atmosphere, filter, wash, and dry after cooling to obtain a three-dimensional porous carbon nanosheet powder.

[0022] Preferably, the sodium salt of an organic acid is at least one of sodium citrate, sodium ascorbate, sodium succinate and sodium gluconate; the selected sodium salt of an organic acid can be cracked into sodium carbonate crystals and include For the carbon coating layer, the sodium carbonate crystals are washed with water to obtain a three-dimensional porous carbon nanosheet structure.

[0023] The inert atmosphere is Ar gas, N 2 Gas, Ar / H 2 One of the gas mixtures. Cleavage of organic acid sodium salts to carbon under an inert atmosphere.

[0024] Preferably, the speed of the ball mill is 100-500r / min,...

Embodiment 1

[0043] This embodiment provides a carbon nanotube-carbon nanosheet-germanium composite negative electrode material, which is composed of nano-germanium, carbon nano-sheets and carbon nanotubes, and is a three-dimensional network porous structure; both nano-germanium and carbon nanotubes are grown on carbon In the three-dimensional pore structure of nanosheets. The particle size of the nano-germanium is 30-100 nm, the diameter of the carbon nano-tube is 10-50 nm, and the thickness of the carbon nano-sheet is 5-10 nm.

[0044] The present invention also proposes a method for preparing the above-mentioned carbon nanotube-carbon nanosheet-germanium composite negative electrode material, comprising the following steps:

[0045] (1) Put 60g of sodium citrate into a planetary ball mill at 350r / min for 3h, place it in a tube furnace and heat it up to 700°C for 2h under a high-purity Ar atmosphere. After cooling, filter, wash, and dry to obtain black three-dimensional Porous carbon na...

Embodiment 2

[0053] This embodiment provides a carbon nanotube-carbon nanosheet-germanium composite negative electrode material, which is composed of nano-germanium, carbon nano-sheets and carbon nanotubes, and is a three-dimensional network porous structure; both nano-germanium and carbon nanotubes are grown on carbon In the three-dimensional pore structure of nanosheets. The diameter of the nano-germanium is 30-100nm, the diameter of the carbon nanotube is 10-100nm, and the thickness of the carbon nano-sheet is 5-20nm.

[0054] The present invention also proposes a method for preparing the above-mentioned carbon nanotube-carbon nanosheet-germanium composite negative electrode material, comprising the following steps:

[0055] (1) Put 60g of potassium citrate into a planetary ball mill at 350r / min for 3h, put it in a tube furnace and raise the temperature to 800°C for 2h under a high-purity Ar atmosphere, then filter, wash, and dry after cooling to obtain a black three-dimensional Porous...

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Abstract

The invention discloses a carbon nanotube-carbon nanosheet-germanium composite negative electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: firstly, taking organic acid sodium salt as a raw material, and carrying out heat treatment to obtain a three-dimensional porous carbon nanosheet; then uniformly dispersing the three-dimensional porous carbon nanosheets in an aqueous solution containing a surfactant; dissolving germanium oxide in an alkaline aqueous solution, adjusting the solution to be neutral, adding the solution into the mixed solution, carrying out ultrasonic stirring dispersion, adding a hydroboron aqueous solution, and carrying out water-bath constant-temperature stirring reaction to obtain germanium precursor composite carbon nanosheet powder; finally, the germanium precursor composite carbon nanosheet powder, melamine, high-boiling-point mineral oil and a cobalt salt solution are subjected to grinding or ball milling and uniform mixing to form a muddy mixture, the muddy mixture is placed in an inert atmosphere for carbonization treatment, and the carbon nanotube-carbon nanosheet-germanium composite material is obtained. The raw materials adopted in the preparation method are low in price and easy to obtain, the preparation process is simple, and large-scale preparation can be achieved.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a carbon nanotube-carbon nanosheet-germanium composite negative electrode material and a preparation method and application thereof. Background technique [0002] Germanium (Ge) is a group IVA element, due to its high theoretical specific capacity (theoretical mass specific capacity is 1600mAh g -1 , Theoretical volume specific capacity is 8500mAh cm -3 ), low lithium intercalation potential, and good conductivity, so it is considered to have great potential in replacing graphite anodes as anode materials for high specific energy lithium-ion batteries. However, the volume expansion of the germanium negative electrode can reach 300% after lithium intercalation, and the huge volume expansion effect will generate a large stress, which will lead to the pulverization failure of the germanium negative electrode material, and the detachment from the current collector, causing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62C01B32/15C01B32/16B22F1/054B22F1/07B22F9/24B82Y30/00B82Y40/00
CPCH01M4/625H01M4/38C01B32/16C01B32/15B22F9/24B82Y30/00B82Y40/00Y02E60/10
Inventor 刘双科许静吴文植郝紫勋李宇杰孙巍巍郑春满
Owner NAT UNIV OF DEFENSE TECH
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