Silicon negative pole piece, production method and application thereof

A silicon negative electrode and negative electrode technology, applied in the direction of negative electrode, electrode manufacturing, electrode rolling/calendering, etc., can solve the problems of unfavorable batch production, long-term commercial application, and complicated modification methods, so as to improve production efficiency and enhance Toughness, the effect of reducing the aging time

Active Publication Date: 2020-07-24
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although there are many literature reports focusing on improving silicon anode materials and composition, these improvement measures can play a good role to a certain extent, but it takes a long time before commercial application, and at the same time, the modification method is relatively complicated. Not conducive to mass production

Method used

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  • Silicon negative pole piece, production method and application thereof
  • Silicon negative pole piece, production method and application thereof
  • Silicon negative pole piece, production method and application thereof

Examples

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preparation example Construction

[0057] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0058] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0060] Weigh 80g of nano-silicon material, 0.5g of binder PAA, 0.5g of dispersant sodium dodecylbenzenesulfonate, 2g of conductive agent carbon nanotubes, 2g of thickener CMC, and 100g of water.

[0061] First add the thickener to half of the formula amount of water, then add the binder, dispersant, conductive agent and negative electrode active material in sequence under stirring conditions, and add the remaining water after the dispersion is uniform; grind the obtained slurry, After sieving, negative electrode slurry is obtained.

[0062] The negative electrode slurry is coated on the surface of the copper current collector, and the thickness of the active material layer obtained after coating and rolling is 100±0.5 μm.

[0063] Then 2g of graphite fiber, 1g of nickel fiber and 10g of PVDF glue were stirred and mixed evenly, and the prepared glue was spin-coated on the rolled active material layer using a rotary glue coater, and after vacuum drying, it was mixed with electro...

Embodiment 2-17

[0066] The preparation method is the same as in Example 1, the only difference is that in the preparation process of the silicon negative plate, the selection and dosage of each component in the active material layer are different, and the selection and dosage of each component in the functional layer are different, as shown in Table 1-Table 5.

[0067] Table 1 is the selection of each component in the active material layer described in embodiment 1-17

[0068]

[0069] Table 2 is the selection of each component in the functional layer described in embodiment 1-17

[0070] Functional layer type carbon fiber metal fiber Conductive plastic B1 Graphite Carbon Fiber nickel fiber PVDF B2 Graphite Carbon Fiber aluminum fiber PVDF B3 carbon nanotube fiber zinc fiber PAAA B4 carbon nanotube fiber copper fiber PAAA B5 graphene fiber iron fiber PAN B6 graphene fiber manganese fiber PAN B7 carbon fiber ...

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Abstract

The invention provides a silicon negative pole piece, a production method and an application thereof. The silicon negative pole piece comprises a negative current collector, an active substance layerarranged on a surface of one side or the surfaces of two sides of the negative current collector, and a functional layer arranged on the surface of the active substance layer, wherein the functional layer includes carbon fibers, metal fibers and a conductive adhesive; and the active material layer includes a negative electrode active material selected from a silicon material. The method comprisesthe following steps: firstly, coating the active substance layer on the surface of a current collector; further coating the functional layer after drying; and drying and rolling to obtain the siliconnegative pole piece. The carbon fiber in the functional layer reduces resistivity of the silicon negative pole piece, enhances a liquid absorption capacity of the silicon negative pole piece, shortensaging time, and is beneficial to improving production efficiency. Due to addition of the metal fibers in the functional layer, the resistivity of the silicon negative pole piece is greatly reduced, toughness of the silicon negative pole piece is enhanced, and the silicon negative pole piece is effectively prevented from powder falling.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a silicon negative electrode sheet and its preparation method and application. Background technique [0002] In recent years, in order to meet the rapid development needs of new energy vehicles, smart grids, and distributed energy storage, the development of lithium-ion batteries with high energy density, high safety, and long cycle life has become a research hotspot in the field of energy storage. The improvement of battery energy density mainly depends on the development of key electrode materials, such as the continuous improvement of the capacity of positive and negative electrode materials. The capacity of existing carbon anode materials for lithium-ion batteries is approaching the limit. In order to meet the energy demands of the new generation and increase the energy density of batteries, it is imminent to develop new lithium-ion battery anode technologies. [0003] Silic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/134H01M4/1395H01M4/38H01M4/62H01M10/0525
CPCH01M4/0404H01M4/0435H01M4/134H01M4/1395H01M4/386H01M4/624H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 袁号李素丽赵伟李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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