CN209104267U - A kind of lithium ion battery silicon-carbon cathode pole piece - Google Patents
A kind of lithium ion battery silicon-carbon cathode pole piece Download PDFInfo
- Publication number
- CN209104267U CN209104267U CN201822186978.8U CN201822186978U CN209104267U CN 209104267 U CN209104267 U CN 209104267U CN 201822186978 U CN201822186978 U CN 201822186978U CN 209104267 U CN209104267 U CN 209104267U
- Authority
- CN
- China
- Prior art keywords
- layer
- lithium ion
- silicon
- ion battery
- pole piece
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
Landscapes
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The utility model discloses a kind of lithium ion battery silicon-carbon cathode pole piece, collector, buffer layer, active layer and protective layer, buffer layer is compounded in collection liquid surface, the active layer of the surface recombination of simultaneous buffering layer, and protective layer and is coated on active layer surface；The collector is copper foil；Buffer layer is made of graphite material, buffer layer with a thickness of 40-50 μm, active layer is made of carbon silicon materials, active layer with a thickness of 30-40 μm, protective layer is made of grapheme material, protective layer with a thickness of 10-20 μm.Lithium ion battery silicon-carbon cathode pole piece provided by the utility model is compared for traditional lithium ion battery negative electrode; it is added to graphite buffer layer and graphene protective layer; graphite buffer layer can be absorbed and discharge silicon stress caused by volume expansion in charge and discharge process in silicon carbon material; it prevents the dusting of silicon-carbon active layer and falls off; and graphite itself is used as lithium ion battery negative material; removal lithium embedded can be carried out, there is good cyclical stability.
Description
Technical field
The utility model belongs to field of lithium ion battery, is related to a kind of lithium ion battery silicon-carbon cathode pole piece.
Background technique
The advantages that lithium ion battery is with its high voltage, high-energy density, high circulation stability, memory-less effect, long-life,
It gradually captures electronics market and finally defeats the battery of other systems, bring great convenience to people's lives.
With being constantly progressive for human society, traditional lithium ion battery has been difficult to cope with the demand in current market, existing
Some lithium ion batteries mainly use graphite type material as the practical gram volume of graphite for cathode and current technology level
Very close its theoretical capacity 372mAh/g.It, just must be using a gram appearance to improve the energy density of lithium ion battery again
It measures higher material and makees negative electrode of lithium ion battery.
As people constantly study, it is found that silicon has the up to theoretical specific capacity of 4200mAh/g as cathode, and reserves fill
Foot, it is cheap.But there is also the difficulties in practical application for it, and if intrinsic conductivity is low, silicium cathode has in charge and discharge process
Up to 300% or more expansion and contraction, resulting mechanical stress can make silicon materials gradually be crushed, dusting, surface can not
Stable SEI film is formed, causes battery capacity to decay rapidly and diving failure phenomenon even occurs.Therefore, how silicon materials to be pacified
Entirely be effectively applied in negative electrode of lithium ion battery by be lithium ion battery scientific research from now on focus on research direction.
Utility model content
The purpose of this utility model is to provide a kind of lithium ion battery silicon-carbon cathode pole piece, stone is added in cathode pole piece
Black buffer layer and graphene protective layer, graphite buffer layer can be absorbed and discharge silicon volume in charge and discharge process in silicon carbon material
Stress caused by expanding, prevents the dusting of silicon-carbon active layer and falls off, and graphite itself is used as negative electrode of lithium ion battery material
Material, can carry out removal lithium embedded, have good cyclical stability；Graphene protective layer is avoided that active layer directly connects with electrolyte
Touching, to reduce the generation of active material Yu electrolyte side reaction, prevents the silicon-carbon cathode material surface in charge and discharge process
Solid electrolyte (SEI) film thickness increases and graphene can provide two-dimensional lithium ion tunnel, promotes the migration of lithium ion；Together
When, therefore the polarization that graphite buffer layer and graphene protective layer electronic conductivity with higher can reduce cathode pole piece passes through
Graphite buffer layer and the compound silicon-carbon cathode pole piece of graphene protective layer can effectively improve the reversible capacity of lithium ion battery, multiplying power
Performance and cyclical stability.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of lithium ion battery silicon-carbon cathode pole piece, collector, buffer layer, active layer and protective layer, buffer layer are compounded in
Collection liquid surface, the active layer of the surface recombination of simultaneous buffering layer, and protective layer are coated on active layer surface；
The collector is copper foil；
The buffer layer is made of graphite material, buffer layer with a thickness of 40-50 μm.
The active layer is made of carbon silicon materials, active layer with a thickness of 30-40 μm.
The protective layer is made of grapheme material, protective layer with a thickness of 10-20 μm.
The utility model has the beneficial effects that
Lithium ion battery silicon-carbon cathode pole piece provided by the utility model compared to traditional lithium ion battery negative electrode and
Speech, be added to graphite buffer layer and graphene protective layer, due to graphite be net layer structure and fracture toughness it is good, each carbon atom
Three covalent single bonds are formed with sp2 hybridized orbit and three neighbouring carbon atoms and are arranged in the reticular structure of plane hexagonal, often
It is parallel to each other and combined with van der waals force, interlamellar spacing 0.335nm, these design features and performance of graphite between layer
Graphite buffer layer is set to can be absorbed and discharge silicon stress caused by volume expansion in charge and discharge process in silicon carbon material, and
Since silicon materials volume contraction, graphite will discharge absorbed stress in discharge process, prevents the dusting of silicon-carbon active layer and take off
It falls, the presence of graphite protective layer can improve it to avoid removing of silicon-carbon active material during charge and discharge cycles and broken
The safety in utilization of cycle life and lithium ion battery, and graphite itself is used as lithium ion battery negative material, can be taken off
Embedding lithium has good cyclical stability.
Graphene protective layer is arranged in lithium ion battery negative electrode and is avoided that active layer is direct with electrolyte by the present invention
Contact, to reduce the generation of active material Yu electrolyte side reaction, prevents the silicon-carbon cathode material surface in charge and discharge process
Solid electrolyte (SEI) film thickness increase, the superhigh specific surface area 2630m of graphene2/ g, so that graphene can provide two dimension
Lithium ion tunnel, promote the migration of lithium ion, improve lithium ion conductivity, and its superhigh intensity makes lithium ion battery silicon-carbon
The safety in utilization of cathode pole piece obtains fabulous guarantee.
Graphite used in cathode pole piece preparation process of the present invention and graphene all have excellent electron conduction, can be with
Cathode pole piece electronic conductivity is improved, the polarization of cathode pole piece is reduced, promotes its high rate performance and reversible specific capacity.
Detailed description of the invention
The utility model will be further described below with reference to the accompanying drawings.
Fig. 1 is lithium ion battery silicon-carbon cathode pole piece structure schematic diagram in embodiment 1；
Fig. 2 is that the lithium ion battery silicon-carbon cathode pole piece of the utility model preparation and traditional cathode pole piece cycle performance measure
As a result；
Fig. 3 is lithium ion battery silicon-carbon cathode pole piece structure schematic diagram in embodiment 2；
Fig. 4 is current collector structure schematic diagram in embodiment 2.
Specific embodiment
Fig. 1-4 is please referred to, is described in detail in conjunction with following examples:
A kind of lithium ion battery silicon-carbon cathode pole piece, as shown in Figure 1, including collector 1, buffer layer 2, active layer 3 and guarantor
Sheath 4, buffer layer 2 are compounded in 1 surface of collector, the active layer 3 of the surface recombination of simultaneous buffering layer 2, and protective layer 4 and coat
In 3 surface of active layer；
The collector 1 is copper foil；
The buffer layer 2 is made of graphite material, buffer layer 2 with a thickness of 40-50 μm；Since graphite is net layer structure
And fracture toughness is good, each carbon atom is with sp2Hybridized orbit and three neighbouring carbon atoms form three covalent single bonds and arrange
It is parallel to each other between every layer and combined with van der waals force, interlamellar spacing 0.335nm at the reticular structure of plane hexagonal,
These design features and performance of graphite make graphite buffer layer that silicon can be absorbed and discharge in silicon carbon material in charge and discharge process
Stress caused by volume expansion, and during discharge due to silicon materials volume contraction, graphite will discharge absorbed stress,
It prevents the dusting of silicon-carbon active layer and falls off, the presence of graphite protective layer can be to avoid silicon-carbon active material in charge and discharge cycles mistake
Removing in journey and broken, improves the safety in utilization of its cycle life and lithium ion battery, and graphite itself be used as lithium from
Sub- cell negative electrode material can carry out removal lithium embedded, have good cyclical stability；
The active layer 3 is made of carbon silicon materials, and active layer 3 is with a thickness of 30-40 μm；Make the active layer of cathode preparation with silicon
Specific capacity with higher；
The protective layer 4 is made of grapheme material, protective layer 4 with a thickness of 10-20 μm；Graphene protective layer is avoided that
Active layer is directly contacted with electrolyte, to reduce the generation of active material Yu electrolyte side reaction, is prevented in charge and discharge process
Solid electrolyte (SEI) film thickness on middle silicon-carbon cathode material surface increases, the superhigh specific surface area 2630m of graphene2/ g, makes
Obtaining graphene can provide two-dimensional lithium ion tunnel, promote the migration of lithium ion, improve lithium ion conductivity, and its superelevation is strong
Degree makes the safety in utilization of lithium ion battery silicon-carbon cathode pole piece obtain fabulous guarantee, at the same graphite and graphene all have it is excellent
Cathode pole piece electronic conductivity can be improved in good electron conduction, reduces the polarization of cathode pole piece, it is forthright again to promote it
Energy and reversible specific capacity.
As shown in Fig. 2, by the lithium ion battery silicon-carbon cathode pole piece prepared in the utility model and traditional cathode pole piece
Performance comparison is carried out, wherein the embodiment in Fig. 2 is the charge and discharge of the lithium ion battery silicon-carbon cathode pole piece of the utility model preparation
Electric cycle performance curve, comparative example are the charge-discharge performance curves of traditional pole piece；Wherein in embodiment and comparative example pole piece
Active layer silicon materials mass percent is all 15%, and active layer preparation process is consistent；To made by embodiment and comparative example pole piece
Standby same specification lithium ion half-cell carries out charge and discharge cycles test, test condition respectively are as follows: environment temperature is 25 DEG C, voltage model
It encloses for 0.005~2V, charge-discharge magnification 0.5C；As shown in Figure 2, embodiment lithium-ion electric after charge and discharge cycles 500 times
The capacity retention ratio in pond still has 82.86%, shows good cyclical stability and comparative example capacity retention ratio only has
58.07%；It is possible thereby to illustrate that the addition of buffer layer and protective layer can be to avoid stripping of silicon materials during charge and discharge cycles
From with it is broken and improve the conductivity of electronics and lithium ion, to make cathode pole piece chemical property provided by the utility model
It is greatly improved.
Embodiment 2:
A kind of lithium ion battery silicon-carbon cathode pole piece, as shown in Figure 3 and Figure 4, including collector 1, first buffer layer 2, work
Property layer 3, second buffer layer 4 and protective layer 5, first buffer layer 2 are compounded in 1 surface of collector, while the surface of first buffer layer 2
It is compounded with active layer 3, the surface recombination of active layer 3 has second buffer layer 4, and protective layer 5 is coated on the table of second buffer layer 4
Face；
The collector 1 is copper foil, and the surface of collector 1 is corrugated surface, and the distance of medium wave peak to 1 bottom surface of collector is
Trough can increase the specific surface area of copper foil surface by the way that corrugated surface is arranged, and then make to 2 times of distance of 1 bottom surface of collector
The area for obtaining the buffer layer 2 of copper foil surface coating increases, and the graphite in buffer layer can be absorbed and discharge silicon in silicon carbon material and exists
Stress caused by volume expansion in charge and discharge process, and during discharge due to silicon materials volume contraction, graphite will discharge
The stress absorbed, prevents the dusting of silicon-carbon active layer and falls off, and then can greatly improve pole piece in charge and discharge cycles process
In antistripping and resistant to breakage ability, further increase the safety in utilization of its cycle life and lithium ion battery；
First buffer layer 2 and second buffer layer 4 are that graphite material is made, and thickness is 40-50 μm；By
The surface of simultaneous buffering layer 2 and active layer 3 is rough surface, slow by being respectively provided in the upper and lower surface of active layer 3
The variation of silicon materials volume can be further decreased by rushing layer, and then improve cycle efficieny；
Protective layer 5 is made of grapheme material, protective layer 4 with a thickness of 10-20 μm.
Above content is only to the utility model structure example and explanation, the technology people of affiliated the art
Member makes various modifications or additions to the described embodiments or is substituted in a similar manner, without departing from reality
With novel structure or beyond the scope defined by this claim, all should belong to the protection range of the utility model.
Claims (5)
1. a kind of lithium ion battery silicon-carbon cathode pole piece, which is characterized in that including collector (1), buffer layer (2), active layer (3)
With protective layer (4), buffer layer (2) is compounded in collector (1) surface, the active layer of surface recombination (3) of simultaneous buffering layer (2),
And protective layer (4) is coated on active layer (3) surface.
2. a kind of lithium ion battery silicon-carbon cathode pole piece according to claim 1, which is characterized in that the collector (1)
For copper foil.
3. a kind of lithium ion battery silicon-carbon cathode pole piece according to claim 1, which is characterized in that the buffer layer (2)
Be made of graphite material, buffer layer (2) with a thickness of 40-50 μm.
4. a kind of lithium ion battery silicon-carbon cathode pole piece according to claim 1, which is characterized in that the active layer (3)
Be made of carbon silicon materials, active layer (3) with a thickness of 30-40 μm.
5. a kind of lithium ion battery silicon-carbon cathode pole piece according to claim 1, which is characterized in that the protective layer (4)
Be made of grapheme material, protective layer (4) with a thickness of 10-20 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822186978.8U CN209104267U (en) | 2018-12-25 | 2018-12-25 | A kind of lithium ion battery silicon-carbon cathode pole piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822186978.8U CN209104267U (en) | 2018-12-25 | 2018-12-25 | A kind of lithium ion battery silicon-carbon cathode pole piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209104267U true CN209104267U (en) | 2019-07-12 |
Family
ID=67163192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822186978.8U Expired - Fee Related CN209104267U (en) | 2018-12-25 | 2018-12-25 | A kind of lithium ion battery silicon-carbon cathode pole piece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209104267U (en) |
Cited By (6)
| 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 |
| CN113745646A (en) * | 2021-09-08 | 2021-12-03 | 珠海冠宇电池股份有限公司 | Lithium ion battery of silicon cathode system |
| CN113745466A (en) * | 2021-09-08 | 2021-12-03 | 珠海冠宇电池股份有限公司 | Lithium ion battery of silicon cathode system |
| CN114914444A (en) * | 2021-02-10 | 2022-08-16 | 中国石油化工股份有限公司 | Silicon-carbon negative electrode plate, preparation method thereof and lithium ion battery |
| CN114906835A (en) * | 2022-05-24 | 2022-08-16 | 四川新能源汽车创新中心有限公司 | Carbon material, method for producing same, and lithium metal battery |
| CN117038848A (en) * | 2023-10-08 | 2023-11-10 | 宁德时代新能源科技股份有限公司 | Negative electrode sheet, secondary battery, and electricity utilization device |
-
2018
- 2018-12-25 CN CN201822186978.8U patent/CN209104267U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114914444A (en) * | 2021-02-10 | 2022-08-16 | 中国石油化工股份有限公司 | Silicon-carbon negative electrode plate, preparation method thereof and lithium ion battery |
| CN113594408A (en) * | 2021-07-29 | 2021-11-02 | 珠海冠宇电池股份有限公司 | Negative plate and battery |
| CN113745646A (en) * | 2021-09-08 | 2021-12-03 | 珠海冠宇电池股份有限公司 | Lithium ion battery of silicon cathode system |
| CN113745466A (en) * | 2021-09-08 | 2021-12-03 | 珠海冠宇电池股份有限公司 | Lithium ion battery of silicon cathode system |
| CN114906835A (en) * | 2022-05-24 | 2022-08-16 | 四川新能源汽车创新中心有限公司 | Carbon material, method for producing same, and lithium metal battery |
| CN117038848A (en) * | 2023-10-08 | 2023-11-10 | 宁德时代新能源科技股份有限公司 | Negative electrode sheet, secondary battery, and electricity utilization device |
| CN117038848B (en) * | 2023-10-08 | 2024-03-29 | 宁德时代新能源科技股份有限公司 | Negative electrode sheet, secondary battery, and electricity utilization device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209104267U (en) | A kind of lithium ion battery silicon-carbon cathode pole piece | |
| CN106207191B (en) | It is a kind of for improving the efficient negative pole structure of lithium metal battery cycle life | |
| CN104882607B (en) | A kind of Animal Bone base class graphene lithium ion battery negative material and preparation method thereof | |
| CN104347880A (en) | Lithium ion battery capable of quick charging | |
| CN103219491B (en) | Copper sulfide anode and preparation method thereof | |
| CN106505200B (en) | carbon nanotube/graphene/silicon composite lithium battery cathode material and preparation method thereof | |
| CN102842701A (en) | Lithium ion battery anode pole piece and lithium ion battery comprising same | |
| CN104752698A (en) | Silicon carbon composite material for lithium ion battery cathode, and preparation method of composite material | |
| CN101465416A (en) | High specific capacity composite electrode pole piece for lithium ion battery | |
| CN103839694A (en) | Graphene/metal current collector preparing method | |
| CN108550789B (en) | Sodium ion battery cathode, preparation method thereof and sodium ion battery | |
| CN209641734U (en) | A kind of lithium ion battery silicon-carbon cathode pole piece | |
| CN103441246A (en) | Preparation method and application of three-dimensional nitrogen-doped graphene base tin dioxide composite material | |
| CN110233240A (en) | A kind of anode plate for lithium ionic cell and preparation method thereof and lithium ion battery | |
| CN102820136A (en) | High-energy-density supercapacitor | |
| CN106252653A (en) | The graphitic carbon of a kind of N doping supports and cladding Fe3o4the preparation method of anode material of lithium-ion battery | |
| CN106876684A (en) | A kind of lithium battery silicium cathode material, negative plate and the lithium battery prepared with it | |
| CN102779985A (en) | Graphene modified carbon cathode material and its preparation method | |
| CN202737032U (en) | Silicon carbon negative electrode plate and lithium ion battery | |
| CN203367417U (en) | Metal foil provided with electric conduction protective coating | |
| CN204333111U (en) | A kind of copper-base graphite alkene polymer lithium battery cathode structure | |
| CN109802107A (en) | A kind of preparation method of sodium-ion battery polyene-based composite negative pole material | |
| CN111313004A (en) | Silicon monoxide-lithium titanate-based composite negative electrode material for lithium ion battery and preparation method thereof | |
| CN206961943U (en) | A kind of graphene composite negative structure | |
| CN207504101U (en) | A kind of graphene rectangular lithium ion battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190712 Termination date: 20211225 |