High-silicon-content silicon-carbon negative electrode plate and preparation method thereof

A negative pole piece, silicon carbon technology, applied in the direction of battery electrodes, electrode carriers/current collectors, electrical components, etc., can solve the problems of low electronic conductivity, poor cycle performance, and low potential for lithium extraction and extraction, and achieve improved specific capacity , solve the cost and process difficulty, and alleviate the effect of silicon negative electrode expansion

Pending Publication Date: 2022-01-11
LANXI ZHIDE ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the development of economy and society, consumer electronics such as mobile phones and electric vehicles have higher and higher requirements for battery life. The energy density of existing lithium-ion batteries has gradually been unable to meet the demand. Increasing the specific capacity of positive and negative electrode materials is the key to improving battery life. An effective method for energy density, there is no better choice for positive electrode materials at this stage, and the main improvement is in negative electro

Method used

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  • High-silicon-content silicon-carbon negative electrode plate and preparation method thereof
  • High-silicon-content silicon-carbon negative electrode plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] The present embodiment also provides a method for preparing a silicon-carbon negative electrode pole piece with a high silicon content, which is characterized by comprising the following steps:

[0023] S1: Use a double planetary mixer to disperse and homogenize the carbon material and the binder A in deionized water or N-methylpyrrolidone according to a certain proportion to obtain carbon slurry; use an extrusion coater to disperse the carbon slurry in the current collector It is coated and dried to obtain a carbon layer-coated pole piece; the solid content of the carbon slurry is not specifically limited, preferably 20%-40%, and the solid content is too high or too low, which will cause the slurry viscosity to be inappropriate and difficult. to coat;

[0024] S2: Use a double planetary mixer to disperse and homogenize silicon particles, conductive agent and binder B in deionized water or N-methylpyrrolidone according to a certain proportion to obtain a silicon materia...

Example Embodiment

[0029] Example 1

[0030] The SiO silicon particles were selected, and the average particle size of the SiO particles in the fully charged state measured according to the above method was 15 μm. The conductive carbon black SP and polyacrylic acid PAA were dispersed in deionized water at a ratio of 98:2 with a double planetary mixer, and the solid content was 25%, and then the slurry was coated on the copper foil by an extrusion coater. And drying, the porosity measured by mercury porosimeter and BET specific surface area test method after coating is 66%, and the coating thickness is 35 μm, which satisfies the full electric particle size of silicon particles < thickness of carbon layer × porosity < silicon particles Fully charged particle size × 2. SiO silicon particles, single-walled carbon nanotube conductive agent SWCNT and polyacrylonitrile PAN binder were dispersed and homogenized in N-methylpyrrolidone solvent according to the ratio of 95:1.5:3.5, with a solid content of...

Example Embodiment

[0032] Example 2

[0033] The other steps are the same as in Example 1, the difference is that the SiO silicon particles in Example 1 are replaced with nano-silicon particles, and the average particle size of the nano-silicon particles in the fully charged state is measured to be 8 μm, and the conductive carbon black SP in Example 1 is replaced. Adult artificial graphite, the porosity after coating is 47%, and the coating thickness is 30 μm.

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Abstract

The invention provides a high-silicon-content silicon-carbon negative electrode plate, which comprises a current collector, a carbon layer formed on the surface of the current collector and a silicon material layer formed on the surface of the carbon layer, and the mass ratio of the carbon layer to the silicon material layer is 5: 95-50: 50. The surface of the current collector is coated with the carbon layer, the thickness and porosity of the current collector are controlled, silicon negative electrode expansion can be greatly relieved, and when a proper silicon negative electrode material is matched, the silicon negative electrode content of 50% or above can be achieved, and then the specific capacity of the pole piece can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a silicon-carbon negative electrode sheet with high silicon content and a preparation method thereof. Background technique [0002] With the development of economy and society, consumer electronics such as mobile phones and electric vehicles have higher and higher requirements for battery life. The energy density of existing lithium-ion batteries has gradually been unable to meet the demand. Increasing the specific capacity of positive and negative electrode materials is the key to improving battery life. For effective methods of energy density, there is no better choice for positive electrode materials at this stage, and the main improvement lies in negative electrode materials. Silicon carbon anode is recognized as the next-generation high energy density lithium battery anode material, which has high specific capacity (close to 10 times that of existing graphite a...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/134H01M4/66H01M4/38H01M4/583H01M4/62
CPCH01M4/133H01M4/134H01M4/667H01M4/583H01M4/625H01M4/386H01M4/621Y02E60/10
Inventor 姚林林其他发明人请求不公开姓名
Owner LANXI ZHIDE ADVANCED MATERIALS CO LTD
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