Silicon carbon negative electrode, preparation method thereof, lithium ion battery and electric vehicle

A silicon carbon and negative electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor electrical conductivity, large volume effect, high silicon particle powder, etc., to improve heat dissipation capacity, improve cycle performance, good The effect of heat dissipation

Active Publication Date: 2021-01-12
桑德新能源技术开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Silicon has a large volume effect in the process of intercalation and delithiation, and the high volume expansion rate makes the silicon particles pulverized severely during the cycle, and the capacity decays rapidly;
[0005] 2. Silicon is a semiconductor, and its conductivity is much worse than that of graphite anode, which greatly affects the first Coulombic efficiency and high-current charge-discharge capability of silicon-based lithium batteries.

Method used

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  • Silicon carbon negative electrode, preparation method thereof, lithium ion battery and electric vehicle
  • Silicon carbon negative electrode, preparation method thereof, lithium ion battery and electric vehicle

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preparation example Construction

[0066] According to a second aspect of the present invention, there is provided a preparation method of the above-mentioned silicon carbon negative electrode, comprising the following steps:

[0067] The coating slurry is first coated on the negative electrode current collector, and then the silicon carbon negative electrode material slurry is coated after drying to obtain a silicon carbon negative electrode; the coating slurry is mainly bonded by the mass ratio of mesophase pitch, graphene and coating The silicon carbon anode material slurry is mainly obtained by dissolving or dispersing the silicon carbon anode active material, the conductive agent and the anode material binder in the solvent.

[0068] The description of the mesophase pitch, graphene and coating binder of the coating slurry and the description of the silicon carbon negative electrode active material, conductive agent and negative electrode material binder of the silicon carbon negative electrode material slur...

Embodiment 1

[0086] A silicon carbon negative electrode comprises a negative electrode current collector copper foil, a coating layer and a silicon carbon negative electrode material layer sequentially arranged on the surface of the negative electrode current collector copper foil;

[0087] The coating is composed of mesophase pitch, graphene and water-based polyvinylidene fluoride with a mass ratio of 30:65:5; the silicon carbon anode material layer is composed of a mass ratio of 95.4:1.1:3.5. The silicon carbon anode active material, conductive agent and The negative electrode material is composed of a binder. The silicon carbon negative electrode active material is composed of SiO and graphite, and the mass of SiO accounts for 8%. The conductive agent is conductive carbon black (SP), and the negative electrode material binder is a mass ratio of 4:3. Sodium carboxymethyl cellulose and styrene-butadiene rubber.

[0088] The preparation method of the above-mentioned silicon carbon negative...

Embodiment 2

[0092] A silicon carbon negative electrode comprises a negative electrode current collector copper foil, a coating layer and a silicon carbon negative electrode material layer sequentially arranged on the surface of the negative electrode current collector copper foil;

[0093]The coating is composed of mesophase pitch, graphene and water-based polyvinylidene fluoride with a mass ratio of 40:55:5; the silicon-carbon anode material layer is composed of a mass ratio of 95.4:1.1:3.5. The silicon-carbon anode active material, conductive agent and The negative electrode material is composed of a binder. The silicon carbon negative electrode active material is composed of SiO and graphite, and the mass of SiO accounts for 8%. The conductive agent is conductive carbon black (SP), and the negative electrode material binder is a mass ratio of 3:4. Sodium carboxymethyl cellulose and styrene-butadiene rubber.

[0094] The preparation method of the above-mentioned silicon carbon negative ...

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Abstract

The invention discloses a silicon-carbon negative electrode, a preparation method thereof, a lithium ion battery and an electric vehicle, which relate to the technical field of the silicon-carbon negative electrode of the lithium ion battery. The silicon-carbon negative electrode comprises a negative electrode current collector, a coating and a silicon-carbon negative electrode material layer sequentially arranged on the surface of the negative electrode current collector; Coatings include: mesophase pitch, graphene and coating binder, mesophase pitch, graphene and binder mass ratio of 20-50:40-65: 1.5-10. The silicon-carbon negative electrode current collector of the present invention is coated with a mesophase pitch, The coating of graphene and binder can improve the conductivity and heat dissipation of silicon-carbon negative electrode, improve the cycle performance, safety and high current charging and discharging ability of lithium ion battery. The binder is PVDF of water system,and the adhesive between coating and negative electrode material PVDF of water system is synergistic to enhance the adhesion between coating and negative electrode material and further improve the cycle performance.

Description

technical field [0001] The invention relates to the technical field of silicon carbon negative electrodes of lithium ion batteries, in particular to a silicon carbon negative electrode, a preparation method thereof, a lithium ion battery and an electric vehicle. Background technique [0002] The improvement of the energy density of lithium-ion batteries has put forward higher requirements for anode materials. At present, the theoretical capacity of graphite anode has reached more than 95%, and the application is close to its theoretical limit. Compared with graphite anodes, silicon-based anode materials have obvious advantages in energy density, and the theoretical specific capacity can be as high as 4200mAh / g. Due to its abundant reserves and low lithium intercalation potential, it has become a hot spot in anode material research and application. [0003] However, there are many problems in practical application of silicon-based anode materials that need to be solved urgent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525H01M10/613H01M10/654B82Y30/00
CPCB82Y30/00H01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/366H01M4/386H01M4/587H01M4/623H01M4/625H01M4/628H01M10/0525H01M10/613H01M10/654Y02E60/10
Inventor 孙敏敏范欢欢娄忠良
Owner 桑德新能源技术开发有限公司
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