CN202737032U - Silicon carbon negative electrode plate and lithium ion battery - Google Patents
Silicon carbon negative electrode plate and lithium ion battery Download PDFInfo
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- CN202737032U CN202737032U CN2012203134786U CN201220313478U CN202737032U CN 202737032 U CN202737032 U CN 202737032U CN 2012203134786 U CN2012203134786 U CN 2012203134786U CN 201220313478 U CN201220313478 U CN 201220313478U CN 202737032 U CN202737032 U CN 202737032U
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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 silicon carbon negative electrode plate and a lithium ion battery. The silicon carbon negative electrode plate comprises a current collector, an active layer, and a buffer layer between the current collector and the active layer. The graphite buffer layer added between the current collector and the active layer can absorb stress when the silicon carbon active layer expands, and can release stress when the silicon carbon active layer shrinks so as to prevent the silicon carbon active layer from powdering and dropping. The graphite buffer layer has a rough surface to ensure tight bonding with the silicon carbon active layer and to prevent the silicon carbon active layer from dropping when removing lithium ions. Graphite has high electron conductivity, so that the conductivity of the negative electrode plate can be improved in charge-discharge process and polarization of the negative electrode plate can be suppressed, thereby facilitating formation of a good SEI (solid electrolyte interphase) film, effectively improving cycle performance of the battery, improving volume energy density of the battery, and realizing practicability of the silicon carbon negative electrode.
Description
Technical field
The utility model relates to technical field of lithium batteries, specially refers to silicon-carbon cathode pole piece and lithium ion battery.
Background technology
Lithium ion battery has voltage height, memory-less effect, energy density high, be widely applied at portable electronics such as smart mobile phone and notebook computers, continuous lifting along with the portable electronics performance, it needs more energy and operating time, and wishes to reduce the volume and weight of lithium ion battery.
Existing lithium ion battery mainly is to adopt graphite type material as negative active core-shell material, the actual gram volume of graphite is very near its theoretical capacity 372mAh/g at present, but the development along with science and technology, some Novel anode materials occurred, its volume energy density is considerably beyond business-like graphite material.Therefore, we can improve by the material Novel anode material volume energy density of lithium ion battery.
Silicon has higher theory gram specific capacity (4200mAh/g), its structure just changes unformed shape into after first embedding lithium end, and in cyclic process after this, keep unformed shape always, silicon is difficult for producing agglomeration in cyclic process, have lower embedding lithium current potential (＜0.5V), and silicon resource is abundant, and environmental friendliness is a kind of Novel anode material with development prospect.But silicon can produce huge change in volume (rate of change surpasses 300%) in embedding/take off in the lithium process, just because of huge change in volume, so that the structure of material is caved in rapidly, efflorescence reaches and comes off from collector, electronics can not shift rapidly and cause material electrochemical performance sharply to descend.
The utility model content
Main purpose of the present utility model is avoided silicon-carbon cathode pole piece that silicon carbon material comes off when the removal lithium embedded ion and preparation method thereof and is used lithium ion battery of this negative pole and preparation method thereof for providing a kind of.
The utility model proposes a kind of silicon-carbon cathode pole piece, comprise collector and active layer, also comprise resilient coating, described resilient coating is between described collector and active layer.
Preferably, described collector is copper foil material, and described resilient coating is graphite material, and described active layer is silicon carbon material.
Preferably, described buffer layer thickness is greater than 20 μ m.
Preferably, described buffer layer thickness is 30 μ m.
Preferably, described active layer thickness is greater than 15 μ m.
Preferably, described active layer thickness is 20 μ m.
The utility model also proposes a kind of lithium ion battery, the silicon-carbon cathode pole piece, and described silicon-carbon cathode pole piece specifically comprises collector and active layer, also comprises resilient coating, described resilient coating is between described collector and active layer.
The utility model adds the graphite resilient coating between collector and active layer, when silicon-carbon active layer during because of the volumetric expansion of embedding lithium, absorb the stress that volumetric expansion produces; When the silicon-carbon active layer when taking off the lithium volume-diminished, with the Stress Release that absorbs out, guaranteed that the silicon-carbon active layer can not produce efflorescence and comes off; The graphite buffer-layer surface is coarse, can make tight bond between silicon-carbon active layer and the resilient coating, has guaranteed that the silicon-carbon active layer does not come off when the removal lithium embedded ion; Simultaneously because the electron conduction of graphite is higher than the electron conduction of silicon-carbon, thereby so that pole piece improves the conductance of cathode pole piece in charge and discharge process, reduce the polarization of cathode pole piece, be conducive to form good SEI film, effectively improve the cycle performance of battery, improve the volume energy density of battery, realized the practical of silicon-carbon cathode.
Description of drawings
Fig. 1 is the structural representation of silicon-carbon cathode pole piece among the utility model one embodiment.
Fig. 2 is the cycle performance test result figure that has the lithium ion battery of silicon-carbon cathode pole piece among the utility model one embodiment.
The realization of the utility model purpose, functional characteristics and advantage are described further with reference to accompanying drawing in connection with embodiment.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
As shown in Figure 1, Fig. 1 is the structural representation of silicon-carbon cathode pole piece among the utility model one embodiment, and the silicon-carbon cathode pole piece that this embodiment mentions comprises collector 10 and active layer 20, also comprise resilient coating 30, resilient coating 30 is between collector 10 and active layer 20.Wherein, collector 10 is copper foil material, and resilient coating 30 is graphite material, and active layer 20 is silicon carbon material.The thickness of resilient coating carries out adjusted design as the case may be, considers battery with the particle diameter of graphite and applies precision, and buffer layer thickness should be greater than 20 μ m, and present embodiment is designed to 30 μ m with buffer layer thickness.Active layer thickness can require to carry out adjusted design according to the actual capacity of lithium ion battery, and active layer thickness is greater than 15 μ m usually, and present embodiment is 20 μ m with the active layer Thickness Design.
When silicon carbon material during as active layer 20, in charge and discharge process, can produce very large change in volume, cause the efflorescence of active material, even come off from collector 10.Therefore, present embodiment adds resilient coating 30 between collector 10 and active layer 20, when the active layer 20 of silicon carbon material in the embedding lithium, the stress that volumetric expansion produces is cushioned layer 30 and absorbs; Volume-diminished when the active layer 20 of silicon carbon material is taking off lithium, resilient coating 30 with the Stress Release that absorbs out, apply a power to silicon carbon material again, thereby have guaranteed that silicon carbon material can not produce efflorescence and comes off.Simultaneously, because resilient coating 30 is comprised of graphite material, its surface ratio is more coarse, can be so that closely be bonded together between silicon-carbon active layer 20 and the resilient coating 30, thereby guaranteed that silicon carbon material can not come off, and has realized the practical of silicon-carbon cathode in the removal lithium embedded ion.In addition, with graphite material as resilient coating 30, on the one hand because graphite material change in volume in the process that discharges and recharges is little, be generally about 10%, has good cyclical stability, and itself be exactly a kind of good ion and electronic conductor, through being often used as the basis material of high power capacity negative pole, and have the embedding lithium current potential similar to silicon; On the other hand, because graphite also is the lithium ion battery negative material of existing main flow, can carry out removal lithium embedded, can not reduce the volume energy density of lithium ion battery, improve the volume energy density of battery; Electron conduction owing to graphite is higher than the electron conduction of silicon-carbon simultaneously, thereby so that pole piece improves the conductance of cathode pole piece in charge and discharge process, reduces the polarization of cathode pole piece, is conducive to form good SEI film.Therefore, graphite material can be used as the basis material of silicon-carbon cathode, also can be used as padded coaming, is used for improving the bulk effect that silicon-carbon cathode material produces in the charge and discharge cycles process, effectively improves the cycle performance of battery.
The utility model also proposes a kind of lithium ion battery, comprises the silicon-carbon cathode pole piece, and this silicon-carbon cathode pole piece specifically comprises collector 10 and active layer 20, also comprises resilient coating 30, and resilient coating 30 is between collector 10 and active layer 20.
Silicon-carbon cathode pole piece in the utility model lithium ion battery can comprise aforementioned embodiment illustrated in fig. 1 in all technical schemes, its detailed construction and stress absorption and release principle can be with reference to previous embodiment, therefore not to repeat here.Owing to adopt the scheme of aforementioned silicon-carbon cathode pole piece, the utility model lithium ion battery is for existing lithium ion battery, and the battery capacity conservation rate is high, good cycle.
As shown in Figure 2, Fig. 2 is the cycle performance test result figure that has the lithium ion battery of silicon-carbon cathode pole piece among the utility model one embodiment.
Present embodiment carries out the normal temperature loop test to the battery of gained, is specially the test of normal temperature 1C charge and discharge cycles, can find out from test result, and through the circulation of 500 weeks, the battery capacity conservation rate is 83%, shows good cycle performance.
In addition, present embodiment will have the lithium ion battery of silicon-carbon cathode pole piece and make L * W * T=61.5 * 42.0 * 4.5(mm), and through measuring, its capacity is 1850mAh, and internal resistance is 45m Ω, and the volume energy density of battery is improved significantly.
It below only is preferred embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (7)
1. a silicon-carbon cathode pole piece comprises collector and active layer, it is characterized in that, also comprises resilient coating, and described resilient coating is between described collector and active layer.
2. silicon-carbon cathode pole piece according to claim 1 is characterized in that, described collector is copper foil material, and described resilient coating is graphite material, and described active layer is silicon carbon material.
3. silicon-carbon cathode pole piece according to claim 2 is characterized in that, described buffer layer thickness is greater than 20 μ m.
4. silicon-carbon cathode pole piece according to claim 3 is characterized in that, described buffer layer thickness is 30 μ m.
5. according to claim 2 or 3 described silicon-carbon cathode pole pieces, it is characterized in that described active layer thickness is greater than 15 μ m.
6. according to claim 2 or 3 described silicon-carbon cathode pole pieces, it is characterized in that described active layer thickness is 20 μ m.
7. a lithium ion battery is characterized in that, comprises such as each described silicon-carbon cathode pole piece of claim 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203134786U CN202737032U (en) | 2012-06-29 | 2012-06-29 | Silicon carbon negative electrode plate and lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203134786U CN202737032U (en) | 2012-06-29 | 2012-06-29 | Silicon carbon negative electrode plate and lithium ion battery |
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| CN202737032U true CN202737032U (en) | 2013-02-13 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108155373A (en) * | 2016-12-06 | 2018-06-12 | 宁德新能源科技有限公司 | Negative electrode active material and preparation method thereof, cathode pole piece and battery core |
| CN109546082A (en) * | 2018-11-07 | 2019-03-29 | 惠州市豪鹏科技有限公司 | A kind of cathode pole piece and preparation method thereof and lithium ion battery |
| CN110858642A (en) * | 2018-08-24 | 2020-03-03 | 中信国安盟固利动力科技有限公司 | Preparation method of silicon/graphite/solid electrolyte composite negative electrode material |
| CN112802998A (en) * | 2021-03-24 | 2021-05-14 | 燕山大学 | Silicon-based negative electrode and preparation method and application thereof |
| CN113851609A (en) * | 2021-08-26 | 2021-12-28 | 蜂巢能源科技有限公司 | Silicon-based negative electrode plate, preparation method thereof and all-solid-state lithium ion battery |
-
2012
- 2012-06-29 CN CN2012203134786U patent/CN202737032U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108155373A (en) * | 2016-12-06 | 2018-06-12 | 宁德新能源科技有限公司 | Negative electrode active material and preparation method thereof, cathode pole piece and battery core |
| CN110858642A (en) * | 2018-08-24 | 2020-03-03 | 中信国安盟固利动力科技有限公司 | Preparation method of silicon/graphite/solid electrolyte composite negative electrode material |
| CN109546082A (en) * | 2018-11-07 | 2019-03-29 | 惠州市豪鹏科技有限公司 | A kind of cathode pole piece and preparation method thereof and lithium ion battery |
| CN112802998A (en) * | 2021-03-24 | 2021-05-14 | 燕山大学 | Silicon-based negative electrode and preparation method and application thereof |
| CN112802998B (en) * | 2021-03-24 | 2022-05-03 | 燕山大学 | Silicon-based negative electrode and preparation method and application thereof |
| CN113851609A (en) * | 2021-08-26 | 2021-12-28 | 蜂巢能源科技有限公司 | Silicon-based negative electrode plate, preparation method thereof and all-solid-state lithium ion battery |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180913 Address after: 300000 No. 1506, A block, Wanke city garden, Wang Gang Chang, Hebei District, Tianjin. Patentee after: Han Zhijuan Address before: 518000 Guangdong Shenzhen Longgang District Longcheng Street Longxi community A Industrial Park Patentee before: SHENZHEN OCEANSUN BATTERY Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130213 |
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| CX01 | Expiry of patent term |