CN215896452U - Copper foil and lithium ion battery - Google Patents
Copper foil and lithium ion battery Download PDFInfo
- Publication number
- CN215896452U CN215896452U CN202121405207.9U CN202121405207U CN215896452U CN 215896452 U CN215896452 U CN 215896452U CN 202121405207 U CN202121405207 U CN 202121405207U CN 215896452 U CN215896452 U CN 215896452U
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- CN
- China
- Prior art keywords
- copper foil
- foil layer
- porous
- porous copper
- battery
- 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.)
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 137
- 239000011889 copper foil Substances 0.000 title claims abstract description 134
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 28
- 239000000758 substrate Substances 0.000 claims abstract description 26
- 229910052744 lithium Inorganic materials 0.000 claims description 12
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 238000004070 electrodeposition Methods 0.000 claims description 5
- 239000003792 electrolyte Substances 0.000 claims description 4
- 210000001787 dendrite Anatomy 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000011149 active material Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- 229920000388 Polyphosphate Polymers 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229940104869 fluorosilicate Drugs 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000001205 polyphosphate Substances 0.000 description 1
- 235000011176 polyphosphates Nutrition 0.000 description 1
- 229940095064 tartrate Drugs 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
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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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- Cell Electrode Carriers And Collectors (AREA)
- Secondary Cells (AREA)
Abstract
The utility model relates to the technical field of copper foils for lithium ion batteries, and discloses a copper foil, which comprises a copper foil substrate (1), a porous copper foil layer (2), and a microporous plastic box (3) wrapping the copper foil substrate (1) and the porous copper foil layer (2); the porous copper foil layer (2) comprises an upper porous copper foil layer (21) and a lower porous copper foil layer (22), the upper porous copper foil layer (21) is arranged on the upper surface of the copper foil substrate (1), and the lower porous copper foil layer (22) is arranged on the lower surface of the copper foil substrate (1). The lithium ion battery prepared by the copper foil provided by the utility model has the advantages of light weight, small volume and high energy density, and can meet the requirements of miniaturization and light weight of the battery.
Description
Technical Field
The utility model relates to the technical field of copper foils for lithium ion batteries, in particular to a copper foil and a lithium ion battery.
Background
Compared with the traditional secondary battery, the lithium ion battery has the advantages of high specific energy, no memory effect, high working voltage, good cycle performance, environmental protection and the like, and is a high-efficiency secondary battery energy storage device with the most development prospect at present. However, lithium dendrites are easily generated in the discharge process of the lithium ion battery, and after the lithium dendrites are broken, the separator is easily punctured to cause a battery short circuit, so that further improvement is still needed.
In addition, the copper foil is an important basic material for preparing the lithium ion battery, the industrial copper foil can be divided into two categories of rolled copper foil and electrolytic copper foil, and the electrolytic copper foil has the advantages of high chemical and electrochemical stability, low cost and simple preparation process, and is a mainstream copper foil product for preparing the lithium ion battery in the current market. However, the specific surface area of the mainstream lithium-ion electrolytic copper foil product in the current market is relatively small, so that the lithium-ion battery is heavy in mass, large in volume and low in charge-discharge efficiency, and the current requirements for miniaturization and light weight of the battery are difficult to meet.
Therefore, a copper foil and a lithium ion battery that can meet the requirements of the current lithium ion battery for safety, miniaturization and light weight are in urgent need.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems of large volume, heavy weight and poor safety of a lithium ion battery in the prior art, and provides a copper foil and the lithium ion battery.
In order to achieve the above object, a first aspect of the present invention provides a copper foil comprising a copper foil substrate 1, a porous copper foil layer 2, a microporous plastic case 3 wrapping the copper foil substrate 1 and the porous copper foil layer 2; the porous copper foil layer 2 comprises an upper porous copper foil layer 21 and a lower porous copper foil layer 22, wherein the upper porous copper foil layer 21 is arranged on the upper surface of the copper foil substrate 1, and the lower porous copper foil layer 22 is arranged on the lower surface of the copper foil substrate 1.
Preferably, the copper foil base 1 has a thickness of 1.5 to 6 μm.
Preferably, the upper porous copper foil layer 21 has a thickness of 1.5 to 6 μm, and the lower porous copper foil layer 22 has a thickness of 1.5 to 6 μm.
Preferably, the upper porous copper foil layer 21 and the lower porous copper foil layer 22 have the same thickness.
Preferably, the upper and lower porous copper foil layers 21 and 22 are disposed on the upper and lower surfaces of the porous copper foil layer 2, respectively, by an electrodeposition method.
Preferably, the microporous plastic box 3 is provided with micropores 31, and the diameter of the micropores 31 is 0.25-3 mm.
Preferably, the micro-holes 31 are uniformly arranged on the micro-hole plastic box 3.
The second aspect of the utility model provides a lithium ion battery, wherein the battery comprises a battery positive electrode shell 4, an elastic sheet 5, a gasket 6, a copper foil 7 according to the first aspect of the utility model, a metal lithium sheet 8 and a battery negative electrode shell 9 which are arranged in a battery shell in sequence.
Through the technical scheme, the utility model has the following technical effects:
1) according to the copper foil provided by the utility model, the copper foil substrate and the porous copper foil layer are wrapped with the layer of the microporous plastic box, so that the function of replacing a partition plate can be achieved, the safety of the battery can be improved, and the requirements of safe use and light weight of the current battery are met;
2) according to the copper foil provided by the utility model, the porous copper foil layers are respectively arranged on the two sides of the copper foil substrate, so that the weight of a lithium ion battery can be reduced, the specific surface area of the copper foil can be increased, more battery active materials can be filled, and the conductivity can be improved;
3) according to the copper foil provided by the utility model, the porous structure on the porous copper foil layer can be used for containing lithium dendrites generated in the use process of a lithium ion battery, and the safety problem caused by the fact that the lithium dendrites pierce a microporous plastic box can be effectively prevented;
4) the lithium ion battery provided by the utility model has the advantages of small mass and high safety, and is suitable for industrial popularization.
Drawings
FIG. 1 is a schematic view of the internal structure of a copper foil according to the present invention;
FIG. 2 is a schematic view of the external structure of a copper foil according to the present invention;
fig. 3 is a schematic diagram of an internal structure of a lithium ion battery provided by the present invention.
Description of the reference numerals
1, copper foil substrate 2, porous copper foil layer 21, upper porous copper foil layer
22, lower porous copper foil layer 3, microporous plastic box 31, micropores
4, a battery positive electrode shell 5, an elastic sheet 6 and a gasket
7, copper foil 8, metal lithium sheet 9 and battery negative electrode shell
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The first aspect of the utility model provides a copper foil, which comprises a copper foil substrate 1, a porous copper foil layer 2, and a microporous plastic box 3 wrapping the copper foil substrate 1 and the porous copper foil layer 2; the porous copper foil layer 2 includes an upper porous copper foil layer 21 and a lower porous copper foil layer 22, the upper porous copper foil layer 21 is disposed on the upper surface of the copper foil substrate 1, and the lower porous copper foil layer 22 is disposed on the lower surface of the copper foil substrate 1, as shown in fig. 1 and 2.
The inventor of the utility model finds that the microporous plastic box 3 is wrapped on the copper foil substrate 1 and the porous copper foil layer 2 to play a role of a separator, so that the safety of the battery can be improved, the volume of the lithium ion battery applied to the rear end is reduced, and the requirements of safe use and light weight of the current battery are met. In addition, compared with the traditional copper foil, the two sides of the copper foil substrate 1 are respectively provided with the porous copper foil layers 2, so that the weight of the battery can be reduced, the specific surface area of the copper foil can be increased, more battery active materials can be filled, and the conductivity can be improved. The porous structure on the porous copper foil layer 2 can also contain lithium dendrites generated in the use process of the lithium ion battery, and the safety problem caused by the fact that the lithium dendrites pierce the microporous plastic box 3 is effectively prevented.
In the utility model, the microporous plastic box 3 wrapping the copper foil substrate 1 and the porous copper foil layer 2 means that the microporous plastic box 3 wraps the copper foil substrate 1 and the porous copper foil layer as a whole.
In a preferred embodiment, the copper foil base 1 has a thickness of 1.5 to 6 μm, preferably 1.5 to 4.5 μm.
The copper foil substrate 1 in the present invention is a pure copper foil product, which can be a commercially available product, or can be obtained by a conventional electrochemical deposition method in the art.
In a preferred embodiment, the upper porous copper foil layer 21 has a thickness of 1.5 to 6 μm, preferably 1.5 to 3 μm; the lower porous copper foil layer 22 has a thickness of 1.5 to 6 μm, preferably 1.5 to 3 μm.
In a preferred embodiment, the upper porous copper foil layer 21 and the lower porous copper foil layer 22 have the same thickness.
In the present invention, the upper porous copper foil layer and the lower porous copper foil layer are prepared by the same method, and taking the upper porous copper foil layer as an example, the preparation method includes: 1) firstly, covering a composite layer on a copper foil substrate 1 by electrodeposition to obtain a composite copper foil; the composite layer is obtained by codeposition of a copper element and a metal element A, and the mass ratio of the copper element to the metal element A is 1: 0.4-0.6, the metal element A is selected from at least one of zinc, silver, iron, nickel, cobalt and titanium, preferably at least one of zinc, silver and nickel; the additive used in the process is at least one selected from tungstate, phosphotungstate, polyphosphate, molybdate, fluorosilicate and tartrate; 2) and putting the composite copper foil into sulfuric acid or hydrochloric acid for chemical corrosion to obtain an upper porous copper foil layer.
In a preferred embodiment, the upper and lower porous copper foil layers 21 and 22 have a porosity of 20 to 50%, preferably 20 to 30%. The pore diameter of the pores contained in the upper porous copper foil layer 21 and the lower porous copper foil layer 22 is 0.6 to 1.2 μm.
In a preferred embodiment, the upper and lower porous copper foil layers 21 and 22 are disposed on the upper and lower surfaces of the porous copper foil layer 2, respectively, by an electrodeposition method.
In a preferred embodiment, the microporous plastic box 3 is provided with micropores 31, and the diameter of the micropores 31 is 0.01-1mm, preferably 0.1-0.2 mm; preferably, the micro-holes 31 are uniformly arranged on the micro-hole plastic box 3.
The microporous plastic is not particularly limited, and the microporous plastic materials commonly used in the field can be used in the utility model. Preferably, the thickness of the microporous plastic casing 3 is 5-50 μm, preferably 10-15 μm. Wherein the thickness of the microporous plastic box 3 refers to the distance between the upper surface and the lower surface of the microporous plastic box 3.
In a second aspect of the present invention, a lithium ion battery is provided, the battery includes a battery positive electrode case 4, an elastic sheet 5, a gasket 6, a copper foil 7 according to the first aspect of the present invention, a metal lithium sheet 8, and a battery negative electrode case 9, which are sequentially disposed in a battery case, as shown in fig. 3.
In the utility model, the microporous plastic box 3 is used for replacing the separator, so that the charging and discharging efficiency of the lithium ion battery can be improved, the safety of the battery is improved, the volume of the lithium ion battery is reduced, and the requirements of safe use and light weight of the current battery are met.
In a preferred embodiment, the battery further comprises an electrolyte, wherein the electrolyte is used for wetting the lithium metal sheet 8.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the utility model, many simple modifications can be made to the technical solution of the utility model, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the utility model, and all fall within the scope of the utility model.
Claims (9)
1. A copper foil is characterized in that the copper foil comprises a copper foil substrate (1), a porous copper foil layer (2), and a microporous plastic box (3) wrapping the copper foil substrate (1) and the porous copper foil layer (2); the porous copper foil layer (2) comprises an upper porous copper foil layer (21) and a lower porous copper foil layer (22), the upper porous copper foil layer (21) is arranged on the upper surface of the copper foil substrate (1), and the lower porous copper foil layer (22) is arranged on the lower surface of the copper foil substrate (1).
2. The copper foil according to claim 1, wherein the copper foil substrate (1) has a thickness of 1.5 to 6 μm.
3. The copper foil of claim 1, wherein the upper porous copper foil layer (21) has a thickness of 1.5-6 μm and the lower porous copper foil layer (22) has a thickness of 1.5-6 μm.
4. The copper foil of claim 1, wherein the upper porous copper foil layer (21) and the lower porous copper foil layer (22) have the same thickness.
5. The copper foil according to claim 1, wherein the upper porous copper foil layer (21) and the lower porous copper foil layer (22) are disposed on the upper surface and the lower surface of the porous copper foil layer (2), respectively, by an electrodeposition method.
6. Copper foil according to claim 1, characterised in that the microporous plastic box (3) is provided with micropores (31), the diameter of the micropores (31) being 0.25-3 mm.
7. Copper foil according to claim 6, characterized in that the micro-holes (31) are evenly arranged on the micro-porous plastic box (3).
8. A lithium ion battery, characterized in that the battery comprises a battery positive electrode shell (4), a spring plate (5), a gasket (6), a copper foil (7) according to any one of claims 1 to 7, a metal lithium plate (8) and a battery negative electrode shell (9) which are arranged in the battery shell in sequence.
9. The lithium ion battery according to claim 8, further comprising an electrolyte, wherein the electrolyte is configured to wet the lithium metal sheet (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121405207.9U CN215896452U (en) | 2021-06-20 | 2021-06-20 | Copper foil and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121405207.9U CN215896452U (en) | 2021-06-20 | 2021-06-20 | Copper foil and lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215896452U true CN215896452U (en) | 2022-02-22 |
Family
ID=80346129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121405207.9U Expired - Fee Related CN215896452U (en) | 2021-06-20 | 2021-06-20 | Copper foil and lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215896452U (en) |
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2021
- 2021-06-20 CN CN202121405207.9U patent/CN215896452U/en not_active Expired - Fee Related
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| 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: 20220222 |