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Silicon-carbon composite pole piece as well as preparation method and application thereof

A silicon-carbon composite and pole piece technology, which is applied to battery electrodes, structural parts, electrical components, etc., can solve problems such as conductive network failure, achieve high conductivity, improve manufacturability, and improve cycle performance.

Pending Publication Date: 2022-05-27
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, due to the large expansion of the electrode sheet of silicon-based materials, the charging cycle is likely to cause the failure of the conductive network. Therefore, how to avoid the failure of the conductive network caused by expansion has become the focus of the existing technology.

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  • Silicon-carbon composite pole piece as well as preparation method and application thereof

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Effect test

Embodiment 1

[0058] This embodiment provides a silicon-carbon composite pole piece, which includes a base body 1, a first conductive layer 2 and a second conductive layer 3 are stacked on both sides of the base body 1 in sequence, and the first conductive layer 2 is dispersed with silicon-carbon active layers. Substance 4, first conductive layer 2 and second conductive layer 3 independently comprise single-walled carbon nanotubes. The base 1 is made of copper foil with a thickness of 0.15 mm.

[0059] like figure 1 As shown, the preparation method of the above-mentioned silicon carbon composite pole piece is as follows:

[0060] (1) After mixing polyvinylidene fluoride, polyvinylpyrrolidone and N-methylpyrrolidone, perform a stirring for 300min to obtain a first glue solution, and then disperse single-wall carbon nanotubes with a diameter of 3nm in the first glue In the liquid, a vacuum stirring was performed for 300 min to obtain a conductive paste. The mass percentages of the component...

Embodiment 2

[0065] This embodiment provides a silicon-carbon composite pole piece, which includes a base body 1, a first conductive layer 2 and a second conductive layer 3 are stacked on both sides of the base body 1 in sequence, and the first conductive layer 2 is dispersed with silicon-carbon active layers. Substance 4, first conductive layer 2 and second conductive layer 3 independently comprise single-walled carbon nanotubes. The base 1 is made of copper foil with a thickness of 0.08 mm.

[0066] The preparation method of above-mentioned silicon carbon composite pole piece is as follows:

[0067] (1) After mixing polyvinylidene fluoride, polyvinylpyrrolidone and N-methylpyrrolidone, perform a stirring for 285min to obtain a first glue solution, and then disperse single-walled carbon nanotubes with a diameter of 0.8nm in the first glue In a glue solution, vacuum stirring was carried out for 285 minutes to obtain a conductive paste. The mass percentages of the components in the conduct...

Embodiment 3

[0072]This embodiment provides a silicon-carbon composite pole piece, which includes a base body 1, a first conductive layer 2 and a second conductive layer 3 are stacked on both sides of the base body 1 in sequence, and the first conductive layer 2 is dispersed with silicon-carbon active layers. Substance 4, first conductive layer 2 and second conductive layer 3 independently comprise single-walled carbon nanotubes. The base 1 is made of copper foil with a thickness of 0.1 mm.

[0073] The preparation method of above-mentioned silicon carbon composite pole piece is as follows:

[0074] (1) After mixing polyvinylidene fluoride, polyvinylpyrrolidone and N-methylpyrrolidone, perform a stirring for 315min to obtain a first glue solution, and then disperse single-walled carbon nanotubes with a diameter of 4nm in the first glue In the glue solution, a vacuum stirring for 315min is performed to obtain a conductive paste. The mass percentages of the components in the conductive past...

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Abstract

The invention provides a silicon-carbon composite pole piece and a preparation method and application thereof.The silicon-carbon composite pole piece comprises a base body, a first conducting layer and a second conducting layer are sequentially stacked on the surface of at least one side of the base body, silicon-carbon active substances are arranged in the first conducting layer in a dispersed mode, and the second conducting layer is arranged in the second conducting layer in a dispersed mode. And the first conductive layer and the second conductive layer independently comprise single-walled carbon nanotubes. According to the invention, enough expansion buffer space is provided for the silicon-based material, the manufacturability of the material is improved, the problem of conductive network failure caused by expansion of silicon carbon in the charging and discharging process can be effectively avoided, and the cycle performance of the pole piece is improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a silicon-carbon composite pole piece, in particular to a silicon-carbon composite pole piece and a preparation method and application thereof. Background technique [0002] Single-walled carbon nanotubes are all composed of carbon atoms, and the geometric structure can be regarded as a single-layer graphene coil. The structure determines the properties. Therefore, single-walled carbon nanotubes have excellent electronic, mechanical and mechanical properties. Compared with multi-walled carbon nanotubes, it has a higher aspect ratio. Adding single-walled carbon nanotubes to the lithium battery slurry formulation can effectively improve the electrical conductivity of the system. At present, the battery energy density requirements are getting higher and higher, the cathode capacity has reached the bottleneck, and there is little room for improvement. Therefore, silicon-based materia...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/36H01M4/38H01M4/583H01M10/0525
CPCH01M4/133H01M4/134H01M4/362H01M4/386H01M4/583H01M4/1393H01M4/1395H01M10/0525Y02E60/10
Inventor 邓松辉
Owner EVE ENERGY CO LTD
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