CN211125820U - Nano silicon-carbon negative pole piece - Google Patents
Nano silicon-carbon negative pole piece Download PDFInfo
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- CN211125820U CN211125820U CN201721664756.1U CN201721664756U CN211125820U CN 211125820 U CN211125820 U CN 211125820U CN 201721664756 U CN201721664756 U CN 201721664756U CN 211125820 U CN211125820 U CN 211125820U
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- silicon
- negative pole
- pole piece
- conductive adhesive
- coating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses a nanometer silicon carbon negative pole piece, including the negative current collector, the coating has the mixed coating of conductive adhesive and silica-based negative material on the negative current collector, and conductive adhesive is polyvinyl acid, and silica-based negative active material comprises a plurality of nano-scale silicon particles, and the surface coating of silicon particle has nanometer graphite alkene coating, and the juncture interface department of silicon particle and conductive adhesive is sealed with vinylene carbonate; the utility model discloses a negative pole piece is with nanometer graphene coating silicon particle surface improvement negative pole piece's conductivity, the adoption has the polyvinyl acid bonding silicon particle of adhesion on to can strengthen the performance of negative pole through forcing to form more stable solid electrolyte interface membrane (SEI), combine the sealed interface of vinylene carbonate, can adapt to the volume change that silicon particle inflation or shrink arouse at the charge-discharge in-process, improve the stability of battery, and then improve the battery performance.
Description
Technical Field
The utility model relates to a battery field relates to a nanometer silicon carbon negative pole piece.
Background
The research of the power lithium ion battery in China is in a high-speed development stage. The lithium ion battery turns to the field of high-power lithium batteries from the field of application of small electronic products, and simultaneously, the lithium ion battery is subjected to negative pole treatmentThe materials pose new requirements. The cathode material is used as an important component of the lithium ion battery, and the overall performance of the lithium ion battery is influenced to a great extent. At present, the commercial lithium ion battery cathode material is usually a graphitized carbon material, and has low specific capacity, poor high-rate charge and discharge performance and potential safety hazard, and cannot meet the requirements of higher specific capacity and safety. Therefore, development of a novel lithium ion battery negative electrode material with high specific capacity, good cycle performance and excellent charge and discharge performance is urgently needed. Silicon has a low intercalation potential and the highest specific capacity among the currently known materials (4200mAh-1) Much larger than the theoretical capacity of graphite; meanwhile, silicon is more reliable as a negative electrode than graphite, so that extensive research is carried out in the field.
Although the capacity of silicon is ten times higher than that of carbon, the capacity of the silicon-based negative electrode material is rapidly attenuated in the lithium removal/insertion process due to the huge volume effect, the electrode cycle performance is rapidly reduced, and the commercialization process is greatly hindered.
The existing adhesive generally adopts carboxymethyl cellulose (CMC) and polyvinylidene fluoride (PVDF), the adhesive force of the existing adhesive to silicon particles is small, the existing adhesive cannot adapt to the change of the adhesive force caused by the volume change of the silicon particles, the damage is generated at the interface between the silicon particles and the adhesive, and the performance of a battery is directly influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's defect, provide a nanometer silicon carbon negative pole piece, the technical scheme of nanometer silicon carbon negative pole piece is realized like this:
the utility model provides a nanometer silicon carbon negative pole piece, includes the negative current collector, the mixed coating of conductive adhesive and silicon-based negative electrode material on the negative current collector, conductive adhesive is polyvinyl acid, silicon-based negative electrode active material comprises a plurality of nanometer silicon particles, the surface coating of silicon particle has nanometer graphite alkene coating, the interface department of silicon particle and conductive adhesive is sealed with vinylene carbonate.
Preferably, the conductive adhesive and the silicon particles are uniformly mixed.
Preferably, the size of the silicon particles is 10nm to 1 μm.
Further preferably, the size of the silicon particles is 100nm to 800 nm.
Preferably, the conductive adhesive may be polyacrylic acid.
The utility model discloses a negative pole piece is with nanometer graphene coating silicon particle surface improvement negative pole piece's conductivity, the adoption has the polyvinyl acid bonding silicon particle of adhesion on to can strengthen the performance of negative pole through forcing to form more stable solid electrolyte interface membrane (SEI), combine the sealed interface of vinylene carbonate, can adapt to the volume change that silicon particle inflation or shrink arouse at the charge-discharge in-process, improve the stability of battery, and then improve the battery performance.
Drawings
Fig. 1 is the structure schematic diagram of the graphene lithium ion negative electrode plate of the present invention.
Reference numerals: 10-negative electrode current collector, 11-conductive adhesive, 12-silicon particles, 13-nano graphene coating and 14-vinylene carbonate.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a nano silicon carbon negative electrode plate includes a negative electrode current collector 10, a mixed coating of a conductive adhesive 11 and a silicon-based negative electrode material is coated on the negative electrode current collector 10, the conductive adhesive 11 is polyethylene acid, the silicon-based negative electrode active material is composed of a plurality of nano-scale silicon particles 12, the surface of each silicon particle 12 is coated with a nano graphene coating 13, and the interface between each silicon particle 12 and the conductive adhesive 11 is sealed by vinylene carbonate 14.
Preferably, the conductive adhesive 11 and the silicon particles 12 are uniformly mixed.
Preferably, the silicon particles 12 have a size of 10nm to 1 μm.
Further preferably, the size of the silicon particles 12 is 100nm to 800 nm.
Preferably, the conductive adhesive 11 may be polyacrylic acid.
The technical contents and features of the present invention have been disclosed as above, and those skilled in the art may still make substitutions and modifications based on the teachings of the present invention without departing from the spirit of the present invention, therefore, the protection scope of the present invention is not limited to the contents disclosed in the embodiments, but also includes various substitutions and modifications without departing from the spirit of the present invention.
Claims (3)
1. A nanometer silicon carbon negative pole piece is characterized in that: the negative electrode current collector is coated with a mixed coating of a conductive adhesive and a silicon-based negative electrode material, the conductive adhesive is polyvinyl acid, the silicon-based negative electrode material is composed of a plurality of nanoscale silicon particles, the surfaces of the silicon particles are coated with nano graphene coatings, and the interface between the silicon particles and the conductive adhesive is sealed by vinylene carbonate.
2. The nano silicon carbon negative pole piece of claim 1, wherein: the size of the silicon particles is 10 nm-1 mu m.
3. The nano silicon carbon negative pole piece of claim 1, wherein: the size of the silicon particles is 100 nm-800 nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721664756.1U CN211125820U (en) | 2017-12-04 | 2017-12-04 | Nano silicon-carbon negative pole piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721664756.1U CN211125820U (en) | 2017-12-04 | 2017-12-04 | Nano silicon-carbon negative pole piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211125820U true CN211125820U (en) | 2020-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721664756.1U Active CN211125820U (en) | 2017-12-04 | 2017-12-04 | Nano silicon-carbon negative pole piece |
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| Country | Link |
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| CN (1) | CN211125820U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113594408A (en) * | 2021-07-29 | 2021-11-02 | 珠海冠宇电池股份有限公司 | Negative plate and battery |
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2017
- 2017-12-04 CN CN201721664756.1U patent/CN211125820U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113594408A (en) * | 2021-07-29 | 2021-11-02 | 珠海冠宇电池股份有限公司 | Negative plate and battery |
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