CN203398222U - Negative electrode current collector structure of lithium ion battery and battery containing structure - Google Patents
Negative electrode current collector structure of lithium ion battery and battery containing structure Download PDFInfo
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- CN203398222U CN203398222U CN201320371868.3U CN201320371868U CN203398222U CN 203398222 U CN203398222 U CN 203398222U CN 201320371868 U CN201320371868 U CN 201320371868U CN 203398222 U CN203398222 U CN 203398222U
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- current collector
- lithium ion
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- ion battery
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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 belongs to the technical field of lithium ion batteries and particularly relates to a negative electrode current collector structure of a lithium ion battery. The negative electrode current collector structure comprises a nickel layer and copper layers coated on the nickel layer, wherein the copper layers comprise a first copper layer and a second copper layer, and the nickel layer is arranged between the first copper layer and the second copper layer. According to the negative electrode current collector structure provided by the utility model, the copper layers are respectively coated on the upper surface and lower surface of the nickel layer, so that the direct contact between nickel and lithium ions is avoided, and the alloying reaction is avoided, thus the negative electrode current collector structure can not only significantly improve the deformation problem caused by high-energy density and isotropic negative electrode materials, but also keep good chemical stability and electrical conductivity of an original copper current collector in a negative electrode. In addition, the utility model further discloses a lithium ion battery.
Description
Technical field
The utility model belongs to technical field of lithium ion, the battery that relates in particular to a kind of lithium ion battery negative current collector structure and comprise this structure.
Background technology
Because the integrated level of electronic component and application is more and more higher, consumer battery product is more and more urgent for the requirement of lithium ion battery energy density and battery performance lifting.In this case, the negative material of high-energy-density (the negative pole graphite of 360mAh/g and > 360mAh silicon-carbon anode) has started to be applied on a large scale consumer lithium ion battery product; In addition in order to improve circulation expansion character and the charge-discharge magnification performance of battery, isotropic graphite material has become the first-selection of a lot of lithium battery manufacturer anode material.
In anisotropy graphite charging process, volumetric expansion amount is mainly distributed in pole piece thickness direction (being called for short Z direction), and the swell increment that direction (being called for short X/Y direction) produces in pole piece plane is very little; And isotropic graphite in charging process volumetric expansion amount equalization be distributed to all directions, although the swell increment producing in pole piece Z direction has reduced, in the swell increment of X/Y direction, greatly increase.Electrodes of lithium-ion batteries very thin thickness, generally, in 200um, the swell increment of Z direction is difficult to produce very large internal stress on thickness direction; In contrast to this, the situation in X/Y plane is just completely different, and the size of X/Y direction, at 104～105um yardstick, so the swell increment of X/Y direction is difficult to be discharged, causes the very large internal stress of generation in X/Y plane.Internal stress accumulative total in X/Y plane acquires a certain degree, and it is wrinkling that pole piece regional area will unstability occur, and produce the phenomenon of battery distortion.Although the use of high-energy-density negative material has brought the raising of the energy content of battery, the volumetric expansion amount (comprise X/Y plane in direction) of negative material in charge and discharge process is also larger, so will cause the problem on deformation of battery even more serious.For this high-energy-density, isotropic negative material, adopting the problem on deformation of bringing, is mainly at present that the bonding by strengthening between anode pole piece/barrier film/cathode pole piece interface is improved.But the enhancing of interface bonding increases the resistance that causes lithium ion to pass barrier film interface, and the charge-discharge magnification performance of battery is had to certain loss.In addition, also paid pilot production improves problem on deformation by the method that reduces negative pole compacted density, but the reduction of compacted density can cause the loss of energy content of battery density again.
Utility model content
The purpose of this utility model is: for the deficiencies in the prior art, and provide a kind of lithium ion battery negative current collector structure, this negative pole currect collecting body structure can significantly improve high-energy-density, isotropic negative material and adopt the problem on deformation of bringing, and can continue again to keep original copper current collector good chemical stability and electric conductivity in negative pole.
In order to achieve the above object, the utility model provides a kind of lithium ion battery negative current collector structure, this technical scheme is as follows: a kind of lithium ion battery negative current collector structure, comprise nickel dam and the copper layer that is coated on described nickel dam, described copper layer comprises the first bronze medal layer and the second bronze medal layer, and described nickel dam is arranged between described the first bronze medal layer and described the second bronze medal layer.
Described the first bronze medal layer is coated on upper surface and all edges of described nickel dam, and described the second bronze medal layer is coated on the lower surface of described nickel dam.
Described the first bronze medal layer is coated on the upper surface of described nickel dam, and described the second bronze medal layer is coated on lower surface and all edges of described nickel dam.
The negative current collector material of commercial li-ion used in battery is mainly copper at present, and the yield strength of electrolysis state copper only has 70MPa, the yield strength of electrolysis state nickel is 150MPa, so be changed to after nickel when the material of main part of collector, collector yield strength will significantly improve.After negative current collector yield strength improves, can improve the distortion of battery, before mentioned battery distortion be mainly that unstability by cathode pole piece regional area realizes, after negative current collector yield strength improves, battery is if distortion needs larger internal stress, otherwise cannot make collector plastic elongation and the unstability (crooked wrinkling in other words) of regional area occurs, also just say, the lifting of negative current collector yield strength can have been raised the threshold value of battery distortion; When adopting nickel as the main material of negative current collector, the threshold value of battery distortion also will significantly be raised, and the problem on deformation of battery will significantly improve.
The thickness of described nickel dam is 2～12um, can not be too thin, and too thin meeting causes the absolute strength value of the anti-surrender of collector to decline; Can not be too thick, otherwise can cause energy density loss.Nickel can not be separately as current collector material, and within the scope of 0.5～1.5V, alloying reaction will occur for nickel and lithium; The conductivity of nickel does not have copper good in addition, does the internal resistance that collector can increase battery separately with nickel.
The thickness of described nickel dam is 5～7um.
The thickness of described the first bronze medal layer and described the second bronze medal layer is 1～2um, and take complete covering nickel dam to be design principle, but can not design too thickly, and too thick meeting causes collector integral thickness partially thick.
The thickness of described the first bronze medal layer and described the second bronze medal layer is 1.5um.
The surface of the surface of described the first bronze medal layer and described the second bronze medal layer is all coated with chromium coating or plating Network compound layer, for improving the non-oxidizability of above-mentioned negative pole currect collecting body structure.
The utility model also provides a kind of lithium ion battery, comprise anode pole piece, cathode pole piece, be arranged at barrier film and electrolyte between described anode pole piece and described cathode pole piece, the current collector structure that described cathode pole piece adopts is above-mentioned lithium ion battery negative current collector structure.
The beneficial effects of the utility model are: the utility model comprises nickel dam and the copper layer that is coated on described nickel dam, and described copper layer comprises the first bronze medal layer and the second bronze medal layer, and described nickel dam is arranged between described the first bronze medal layer and described the second bronze medal layer.The method that the utility model employing is respectively plated layer of copper layer in the upper and lower surface of nickel dam avoids nickel to contact with the direct of lithium ion.Avoided generation alloying reaction, so negative pole currect collecting body structure can significantly improve high-energy-density, isotropic negative material and adopts the problem on deformation of bringing like this, can continue again to keep original copper current collector good chemical stability and electric conductivity in negative pole.
Accompanying drawing explanation
Fig. 1 is cross section structure schematic diagram of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model and beneficial effect thereof are elaborated, but embodiment of the present utility model is not limited to this.
embodiment 1, as shown in Figure 1, a kind of lithium ion battery negative current collector structure, comprises nickel dam 1 and the copper layer that is coated on nickel dam 1, and copper layer comprises the first bronze medal layer 2 and the second bronze medal layer 3, and nickel dam 1 is arranged between the first bronze medal layer 2 and the second bronze medal layer 3.
Preferably, the first bronze medal layer 2 is coated on upper surface and all edges of nickel dam 1, and the second bronze medal layer 3 is coated on the lower surface of nickel dam 1.
The thickness of the first bronze medal layer 2 and the second bronze medal layer 3 is 2um, and nickel dam 1 thickness is 12um.
The surface of the surface of the first bronze medal layer 2 and the second bronze medal layer 3 is coated with chromium coating (not shown).
, comprising anode pole piece, cathode pole piece, be arranged at barrier film and electrolyte between anode pole piece and cathode pole piece, the current collector structure that cathode pole piece adopts is above-mentioned lithium ion battery negative current collector structure.
Adopt the high power capacity isotropic graphite of 360mAh/g as the anode material of the present embodiment, according to anode formula (graphite: CMC:SBR:SP=96%:1.0%:2.0%:1.0%) stir and prepare anode slurry, then anode slurry is coated with and prepares anode pole piece on collector, then anode pole piece is colded pressing, then and treated cathode sheet, barrier film, packaging bag be assembled into battery core; Inject electrolyte, after then changing into, just prepare our final finished product battery core.
embodiment 2, as different from Example 1: the first bronze medal layer 2 of the present embodiment is coated on the upper surface of nickel dam 1, the second bronze medal layer 3 is coated on lower surface and all edges of nickel dam 1, and the thickness of the first bronze medal layer 2 and the second bronze medal layer 3 is 1um, and nickel dam 1 thickness is 4um.
Preferably, the surface of the surface of the first bronze medal layer 2 and the second bronze medal layer 3 is coated with Du Network compound layer (not shown).
Other identical with embodiment 1, no longer repeats here.
embodiment 3, as different from Example 2: the first bronze medal layer 2 of the present embodiment and the thickness of the second bronze medal layer 3 are 1.5um, and nickel dam 1 thickness is 2um.
Other identical with embodiment 2, no longer repeats here.
embodiment 4, as different from Example 3: the first bronze medal layer 2 of the present embodiment and the thickness of the second bronze medal layer 3 are 1.5um, and nickel dam 1 thickness is 7um.
Other identical with embodiment 3, no longer repeats here.
comparative example 1,as different from Example 1: this comparative example adopts commercial at present individual layer Copper Foil as negative current collector, and the thickness of copper layer is all 18um.
Other identical with embodiment 1, no longer repeats here.
comparative example 1,different from comparative example 1: the thickness of the copper layer of this comparative example is 8um.
Other identical with comparative example 1, no longer repeats here.
Getting 100 finished product battery cores, is 45 degree in temperature, and the condition circulation of 0.7C/0.5C 500 times, the 1st circulation, is observed the ratio of distortion battery core under the 100th circulation and these three nodes that circulate for the 500th time, and test result is as table 1.
Table 1 is for testing the contrast of battery core proportion of deformation in all embodiment and comparative example:
| ? | The 1st circulation | The 100th circulation | The 500th circulation |
| Embodiment 1 | 0 | 0 | 0 |
| Embodiment 2 | 0 | 0 | 0 |
| Embodiment 3 | 0 | 0 | 2% |
| Embodiment 4 | 0 | 2% | 5% |
| Comparative example 1 | 0 | 3% | 7% |
| Comparative example 2 | 2% | 7% | 30% |
As seen from Table 1, the battery core of embodiment 1 ~ 4 is the 1st circulation, and in the 100th circulation and the 500th circulation, battery core deflection is less, and the deflection of the battery core of comparative example 1 ~ 2 is large.
The announcement of book and instruction according to the above description, the utility model those skilled in the art can also change and revise above-mentioned execution mode.Therefore, the utility model is not limited to above-mentioned embodiment, and any apparent improvement, replacement or modification that every those skilled in the art have done on basis of the present utility model all belong to protection range of the present utility model.In addition,, although used some specific terms in this specification, these terms just for convenience of description, do not form any restriction to the utility model.
Claims (9)
1. a lithium ion battery negative current collector structure, is characterized in that: comprise nickel dam and the copper layer that is coated on described nickel dam, described copper layer comprises the first bronze medal layer and the second bronze medal layer, and described nickel dam is arranged between described the first bronze medal layer and described the second bronze medal layer.
2. lithium ion battery negative current collector structure according to claim 1, is characterized in that: described the first bronze medal layer is coated on upper surface and all edges of described nickel dam, and described the second bronze medal layer is coated on the lower surface of described nickel dam.
3. lithium ion battery negative current collector structure according to claim 1, is characterized in that: described the first bronze medal layer is coated on the upper surface of described nickel dam, and described the second bronze medal layer is coated on lower surface and all edges of described nickel dam.
4. lithium ion battery negative current collector structure according to claim 1, is characterized in that: the thickness of described nickel dam is 2～12um.
5. lithium ion battery negative current collector structure according to claim 4, is characterized in that: the thickness of described nickel dam is 5～7um.
6. lithium ion battery negative current collector structure according to claim 1, is characterized in that: the thickness of described the first bronze medal layer and described the second bronze medal layer is 1～2um.
7. lithium ion battery negative current collector structure according to claim 6, is characterized in that: the thickness of described the first bronze medal layer and described the second bronze medal layer is 1.5um.
8. lithium ion battery negative current collector structure according to claim 1, is characterized in that: the surface of the surface of described the first bronze medal layer and described the second bronze medal layer is all coated with chromium coating Huo Du Network compound layer.
9. a lithium ion battery, comprise anode pole piece, cathode pole piece, be arranged at barrier film and electrolyte between described anode pole piece and described cathode pole piece, it is characterized in that: the current collector structure that described cathode pole piece adopts is the lithium ion battery negative current collector structure described in claim 1 ~ 8 any one.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320371868.3U CN203398222U (en) | 2013-06-26 | 2013-06-26 | Negative electrode current collector structure of lithium ion battery and battery containing structure |
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| CN201320371868.3U CN203398222U (en) | 2013-06-26 | 2013-06-26 | Negative electrode current collector structure of lithium ion battery and battery containing structure |
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| CN203398222U true CN203398222U (en) | 2014-01-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441283A (en) * | 2013-06-26 | 2013-12-11 | 东莞新能源科技有限公司 | Lithium ion battery negative electrode current collector structure and battery containing the same |
| US11088369B2 (en) | 2017-01-06 | 2021-08-10 | Hitachi Metals, Ltd. | Clad material for negative electrode collector of secondary battery and method for manufacturing the same |
-
2013
- 2013-06-26 CN CN201320371868.3U patent/CN203398222U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441283A (en) * | 2013-06-26 | 2013-12-11 | 东莞新能源科技有限公司 | Lithium ion battery negative electrode current collector structure and battery containing the same |
| US11088369B2 (en) | 2017-01-06 | 2021-08-10 | Hitachi Metals, Ltd. | Clad material for negative electrode collector of secondary battery and method for manufacturing the same |
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| GR01 | Patent grant | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20140115 |