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Method for preparing black phosphorus of negative electrode materials of high-capacity lithium-ion battery

A technology for lithium ion batteries and negative electrode materials, which is applied in the fields of chemical material synthesis and electrochemistry, can solve the problem that high-energy ball milling is difficult to accurately control the internal pressure and temperature of a reaction vessel, and achieves excellent compatibility and improved electrochemical performance. Effect

Inactive Publication Date: 2012-06-13
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high energy ball milling method is difficult to accurately control the pressure and temperature inside the reaction vessel

Method used

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  • Method for preparing black phosphorus of negative electrode materials of high-capacity lithium-ion battery
  • Method for preparing black phosphorus of negative electrode materials of high-capacity lithium-ion battery
  • Method for preparing black phosphorus of negative electrode materials of high-capacity lithium-ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Encapsulate white phosphorus in a high-voltage casing with an appropriate volume, cover the top and bottom with heat-conducting and pressure-transmitting medium gaskets, encapsulate it with a high-pressure reaction module, and place it on a six-sided high-pressure press with a given pressure of 2GPa and a given temperature of 300°C , after 60 minutes pressure relief annealing. Gained black phosphorus sample is ground into powder, with polytetrafluoroethylene as binder, N-methylpyrrolidone as organic solvent, acetylene black as conductive agent, according to black phosphorus: acetylene black: polytetrafluoroethylene=80% : 10%: 10% ratio of mixing and stirring evenly, the slurry was coated on the copper foil current collector, and vacuum-dried at 120° C. for 10 hours.

[0017] With lithium sheet as the counter electrode, 1mol / L LiPF is used 6 The mixed solution in ethylene carbonate and diethyl carbonate with a volume ratio of 1:1 is the electrolyte. The diaphragm is Ce...

Embodiment 2

[0019] Encapsulate white phosphorus in a high-voltage casing with an appropriate volume, cover the top and bottom with heat-conducting and pressure-transmitting medium gaskets, encapsulate it with a high-pressure reaction module, and place it on a six-sided high-pressure press with a given pressure of 4GPa and a given temperature of 400°C , after 30 minutes pressure relief annealing. Gained black phosphorus sample is ground into powder, with polytetrafluoroethylene as binder, N-methylpyrrolidone as organic solvent, acetylene black as conductive agent, according to black phosphorus: acetylene black: polytetrafluoroethylene=80% : 10%: 10% ratio of mixing and stirring evenly, the slurry was coated on the copper foil current collector, and vacuum-dried at 120° C. for 10 hours.

[0020] With lithium sheet as the counter electrode, 1mol / L LiPF is used 6 The mixed solution in ethylene carbonate and diethyl carbonate with a volume ratio of 1:1 is the electrolyte. The diaphragm is a ...

Embodiment 3

[0022] The red phosphorus is compacted, packaged in a high-voltage casing, covered with heat-conducting and pressure-transmitting medium gaskets, packaged in a high-pressure reaction module, and placed on a six-sided top high-pressure press with a given pressure of 4.5GPa and a given temperature 800°C, after 20 minutes, pressure relief annealing. The obtained black phosphorus sample is ground into a powder, with polytetrafluoroethylene as a binder, N-methylpyrrolidone as a dispersant, and acetylene black as a conductive agent, according to black phosphorus: acetylene black: polytetrafluoroethylene=80% : 5%: 15% by mixing and stirring evenly, coating the slurry on the copper foil current collector, and vacuum drying at 120° C. for 6 hours.

[0023] With lithium sheet as the counter electrode, 1mol / L LiPF 6 The mixed solution of ethylene carbonate, diethyl carbonate and dimethyl carbonate at a volume ratio of 1:1:1 is the electrolyte. The diaphragm is Celgard2400 microporous m...

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Abstract

The invention belongs to the technical field of chemical material synthesis and electrochemistry and particularly relates to a method for preparing composite materials and black phosphorus of negative electrode materials of a high-capacity lithium-ion battery. According to the method, the black phosphorus of negative electrode materials of the high-capacity lithium-ion battery is synthesized by a high-pressure synthesis method. On one hand, a high-pressure synthesis device is adopted, white phosphorus and red phosphorus are respectively used as raw materials, and pure-phase black phosphorus is synthesized at different pressures and temperatures; on the other hand, the white phosphorus and the red phosphorus are used as raw materials, modified materials are doped, modified black phosphorus is synthesized, the raw materials account for 10 to 90 percent, and the modified materials account for 5 to 50 percent. The black phosphorus prepared by the method is used as the negative electrode materials of the lithium-ion battery, the specific capacity is 3 to 7 times of that of the industrialized graphite negative electrode, the tap density of the black phosphorus negative electrode materials reaches 1.7 to 2.4g / cm<3> and is 2 to 3 times of that of the graphite negative electrode, and the black phosphorus negative electrode has good compatibility with the existing electrolyte and is hopeful to become a new generation of negative electrode materials of the high-capacity lithium-ion battery.

Description

technical field [0001] The invention belongs to the technical field of chemical material synthesis and electrochemistry, and in particular relates to a method for preparing a negative electrode material black phosphorus of a high-capacity lithium ion battery and a composite material thereof. technical background [0002] Energy and the environment have become two major themes in today's world. The product of the era of automobiles has become an indispensable means of transportation for people in today's society. Due to the rise in the price of energy such as oil and the environmental pollution caused by automobile exhaust, people are gradually Aware that it is imperative to develop electric vehicles in our country. From the Green Olympics proposed by the 2008 Olympic Games to the low-carbon life proposed by the 2010 Shanghai World Expo, they all fully reflect my country's determination to develop electric vehicles. The rapid development of the electric vehicle industry has ...

Claims

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Application Information

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IPC IPC(8): C01B25/02H01M4/38
CPCY02E60/12Y02E60/10
Inventor 孙立群谢海明王荣顺
Owner NORTHEAST NORMAL UNIVERSITY
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