CN209641734U - 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
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- CN209641734U CN209641734U CN201920231477.9U CN201920231477U CN209641734U CN 209641734 U CN209641734 U CN 209641734U CN 201920231477 U CN201920231477 U CN 201920231477U CN 209641734 U CN209641734 U CN 209641734U
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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
Abstract
The utility model is a kind of lithium ion battery silicon-carbon cathode pole piece, including buffer layer and collector, which is characterized in that the buffer layer is natural graphite buffer layer, the conductive layer is graphene conductive layer, and the conductive layer is bonded setting with the collector, the active material layer respectively.The utility model structure is simple, and design rationally, using the active material layer of silicon-carbon active layer, can effectively improve the specific capacity of electrode plates, to meet the needs of height ratio capacity；By the way that graphene conductive layer is arranged, transitional function can be generated between collector and active material layer, especially during high rate charge-discharge, it is not easy to polarization phenomena are generated, to solve the problems, such as silicon-carbon active material low conductivity；By the way that natural graphite buffer layer is arranged in outermost layer, it can be ensured that the good cycle performance of lithium ion battery, to meet practicability of the electrode plates made of silicon carbon material in lithium ion battery.
Description
Technical field
The utility model relates to technical field of lithium ion more particularly to a kind of lithium ion battery silicon-carbon cathode pole pieces.
Background technique
Lithium ion battery as a new generation secondary cell, because its energy density height, open-circuit voltage height, output power,
The advantages that low self-discharge, operating temperature range are wide, charge/discharge speed is fast, memory-less effect produces in energy storage device, consumer electronics
Product etc. are multi-field to be widely used.With the fast development of electronic industry, to long circulation life, height ratio capacity, high rate capability
The demand of lithium ion battery is more strong.
And restrict that lithium ion battery energy density further increases is lithium ion battery negative material, it is commercialized at present
Negative electrode material is mostly the various graphite type materials such as hard carbon, soft carbon, natural graphite, artificial graphite, the micro- carbon ball of interphase.Graphite-like carbon
Negative electrode material specific capacity is usually no more than 360mAh/g, and the theoretical capacity of graphite is 372mAh/g, although current graphite negative electrodes
Reality of the material in half-cell, which takes off lithium capacity, can be up to 360mAh/g, but be difficult to further increase, this and negative electrode material mesh
The specific capacity of preceding needs has a long way to go, and is increasingly difficult to meet the market demand.
The study found that the specific capacity of silica-base material is about that 10 times of graphite material specific capacity and extremely low de- lithium voltage are put down
Platform.Therefore, silicon as lithium ion battery negative electrode material carry out deeper into research.But silicon-based anode is anti-in generation alloying
At once, the generation of adjoint phase transformation, while 300% volume expansion is had, so violent volume change can be followed to silica-base material
A series of problem is brought during ring, so that silicon materials be made to occur broken, dusting on electrode slice, electrode coating, which falls off, etc. shows
As ultimately causing capacity rapid decay, seriously hindering its practical application in lithium ion battery.Meanwhile silicon materials sheet
Body is semiconductor material, and the graphite type material that compares has poor electric conductivity, this also seriously hinders the business of silicon-based anode
Change application.There is volume expansion and low conductivity in the electrode plates of namely silicon-carbon cathode material, be unable to satisfy silicon-carbon
Therefore practicability of the electrode plates made of material in lithium ion battery is badly in need of a kind of lithium ion battery silicon-carbon cathode pole piece
To improve the energy density of lithium ion battery.
Summary of the invention
The utility model aims to solve the problem that the deficiencies in the prior art, and provides a kind of lithium ion battery silicon-carbon cathode pole piece.
In order to achieve the above object, the utility model adopts the following technical solutions:
A kind of lithium ion battery silicon-carbon cathode pole piece, including buffer layer and collector, which is characterized in that the buffer layer is
Natural graphite buffer layer, the buffer layer are located at the two sides up and down of the collector, and the buffer layer of upper and lower two sides closes
It is symmetrical arranged in the collector, active material layer, the active material layer is equipped between the buffer layer and the collector
For silicon-carbon active layer, the active material layer is bonded setting with the buffer layer, the active material layer and the collector it
Between be equipped with conductive layer, the conductive layer be graphene conductive layer, the conductive layer respectively with the collector, the active material
Layer fitting setting.
The buffer layer with a thickness of 40 μm.
The active material layer with a thickness of 30 μm.
The conductive layer with a thickness of 15 μm.
The collector is copper foil current collector.
The beneficial effects of the utility model are: the utility model structure is simple, design is reasonable, using the work of silicon-carbon active layer
Property material layer, can effectively improve the specific capacity of electrode plates, to meet the needs of height ratio capacity；It is led by the way that graphene is arranged
Electric layer can generate transitional function, especially during high rate charge-discharge between collector and active material layer, it is not easy to
Polarization phenomena are generated, to solve the problems, such as silicon-carbon active material low conductivity；By the way that natural graphite buffer layer is arranged in outermost layer,
When so that silicon-carbon cathode material expanding in process of intercalation, the concentrated stress of silicon-carbon cathode material generation can be absorbed, in de- lithium
Part stress can be discharged when volume contraction in the process, ensures that silicon-carbon active layer is not in during Li insertion extraction
Dusting and the phenomenon that fall off, avoids the occurrence of excessive expansion.In addition, natural graphite buffer layer advantageously forms good SEI simultaneously
Film, it can be ensured that the good cycle performance of lithium ion battery, so that silicon-carbon cathode pole piece is improved in lithium ion battery, thus
Meet practicability of the electrode plates made of silicon carbon material in lithium ion battery.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
In figure: 1- buffer layer；2- active material layer；3- conductive layer；4- collector；
It is described in detail below with reference to the embodiments of the present invention referring to attached drawing.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples:
As shown in Figure 1, a kind of lithium ion battery silicon-carbon cathode pole piece, including buffer layer 1 and collector 4, which is characterized in that
The buffer layer 1 is natural graphite buffer layer, and the buffer layer 1 is located at the two sides up and down of the collector 4, upper and lower two sides
The buffer layer 1 about the collector 4 be symmetrical arranged, between the buffer layer 1 and the collector 4 be equipped with active material
Layer 2, the active material layer 2 are silicon-carbon active layer, and the active material layer 2 is bonded setting, the activity with the buffer layer 1
Conductive layer 3 is equipped between material layer 2 and the collector 4, the conductive layer 3 is graphene conductive layer, and the conductive layer 3 is distinguished
Setting is bonded with the collector 4, the active material layer 2.
The buffer layer 1 with a thickness of 40 μm.
The active material layer 2 with a thickness of 30 μm.
The conductive layer 3 with a thickness of 15 μm.
The collector 4 is copper foil current collector.
It is directly contacted by graphene conductive layer 3 with active material layer 2, collector 4 in the utility model, is effectively reduced
Interface resistance between active material layer 2 and collector 4, to realize the charge and discharge of big multiplying power, it is not easy to generate polarization phenomena；
Using the active material layer 2 of silicon-carbon active layer, the specific capacity of electrode plates can be effectively improved, to meet the need of height ratio capacity
It asks；By being set as the buffer layer 1 of natural graphite buffer layer in outermost layer, when the reaction of embedding lithium occurs, produced by volume expansion
Concentrated stress absorbed by buffer layer 1, when de- lithium reaction occurs, stress caused by volume contraction is discharged by buffer layer 1, from
And violent dusting will not be generated and split away off by guaranteeing active material layer 2.At the same time, buffer layer 1 is first is that guarantee occurring
Volume change is small during embedding de- lithium, and stable circulation is high, itself is good ion and electronic conductor again, and also with than
Lower embedding lithium point, second is that, due to natural graphite and present lithium ion battery master negative electrode material to be used, not but not
The energy density of negative electrode of lithium ion battery is reduced, and electric conductivity is also better than silicon carbon material, to ensure that pole piece in charge and discharge
Good electric conductivity, avoids the occurrence of polarization phenomena in electric process, to solve the problems, such as silicon-carbon active material low conductivity.In addition,
Natural graphite buffer layer also helps the formation of SEI film.Therefore, natural graphite material can both be used as buffering silicon-carbon material
Material, and can be used as the basis material that stable SEI film is formed, be conducive to the functionization of silicon carbon material, it can be ensured that lithium-ion electric
The good cycle performance in pond, so that silicon-carbon cathode pole piece is improved in lithium ion battery, to meet made of silicon carbon material
Practicability of the electrode plates in lithium ion battery.The utility model structure is simple, and design is reasonable.
The utility model is exemplarily described above in conjunction with attached drawing, it is clear that the utility model specific implementation not by
The limitation of aforesaid way, if the method concept of the utility model and the various improvement of technical solution progress are used, or without
Improvement directly applies to other occasions, both is within the protection scope of the present invention.
Claims (5)
1. a kind of lithium ion battery silicon-carbon cathode pole piece, including buffer layer (1) and collector (4), which is characterized in that the buffering
Layer (1) is natural graphite buffer layer, and the buffer layer (1) is located at the two sides up and down of the collector (4), upper and lower two sides
The buffer layer (1) is symmetrical arranged about the collector (4), is equipped with and lives between the buffer layer (1) and the collector (4)
Property material layer (2), the active material layer (2) is silicon-carbon active layer, and the active material layer (2) and the buffer layer (1) are pasted
Setting is closed, is equipped with conductive layer (3) between the active material layer (2) and the collector (4), the conductive layer (3) is graphite
Alkene conductive layer, the conductive layer (3) are bonded setting with the collector (4), the active material layer (2) respectively.
2. a kind of lithium ion battery silicon-carbon cathode pole piece according to claim 1, which is characterized in that the buffer layer (1)
With a thickness of 40 μm.
3. a kind of lithium ion battery silicon-carbon cathode pole piece according to claim 1, which is characterized in that the active material layer
(2) with a thickness of 30 μm.
4. a kind of lithium ion battery silicon-carbon cathode pole piece according to claim 1, which is characterized in that the conductive layer (3)
With a thickness of 15 μm.
5. a kind of lithium ion battery silicon-carbon cathode pole piece according to claim 1, which is characterized in that the collector (4)
For copper foil current collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920231477.9U CN209641734U (en) | 2019-02-25 | 2019-02-25 | A kind of lithium ion battery silicon-carbon cathode pole piece |
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| CN201920231477.9U CN209641734U (en) | 2019-02-25 | 2019-02-25 | A kind of lithium ion battery silicon-carbon cathode pole piece |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111613774A (en) * | 2020-05-29 | 2020-09-01 | 珠海冠宇电池股份有限公司 | Negative plate and preparation method and application thereof |
| CN113764625A (en) * | 2021-08-26 | 2021-12-07 | 蜂巢能源科技有限公司 | Sulfide silicon-based negative plate, preparation method thereof and all-solid-state lithium ion battery |
| CN114050233A (en) * | 2021-11-25 | 2022-02-15 | 珠海冠宇电池股份有限公司 | Negative pole piece and battery |
-
2019
- 2019-02-25 CN CN201920231477.9U patent/CN209641734U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111613774A (en) * | 2020-05-29 | 2020-09-01 | 珠海冠宇电池股份有限公司 | Negative plate and preparation method and application thereof |
| CN113764625A (en) * | 2021-08-26 | 2021-12-07 | 蜂巢能源科技有限公司 | Sulfide silicon-based negative plate, preparation method thereof and all-solid-state lithium ion battery |
| CN114050233A (en) * | 2021-11-25 | 2022-02-15 | 珠海冠宇电池股份有限公司 | Negative pole piece and battery |
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