CN219040510U - Porous lithium film composite - Google Patents
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- CN219040510U CN219040510U CN202220841856.1U CN202220841856U CN219040510U CN 219040510 U CN219040510 U CN 219040510U CN 202220841856 U CN202220841856 U CN 202220841856U CN 219040510 U CN219040510 U CN 219040510U
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Abstract
The present utility model provides a porous lithium membrane composite having: a bearing layer; a porous, lithium-philic layer on at least one surface of the support layer; and a porous lithium membrane on the porous lithium-philic layer, wherein the porous lithium membrane has a through-hole having a pore size of 5 to 200 μm.
Description
Technical Field
The utility model relates to the technical field of energy storage, in particular to a porous lithium membrane complex which can be used for a secondary battery.
Background
Lithium batteries are widely used in the fields of aerospace, computers, mobile communication equipment, robots, electric automobiles and the like because of the advantages of high energy density, long cycle life and wide applicable temperature range. With the development of society and the progress of technology, the energy density and cycle life of lithium batteries are increasingly required. However, at present, lithium ion batteries using graphite alone as a negative electrode are difficult to meet social expectations, so that development of novel positive and negative electrode materials with higher specific capacities is required. For the negative electrode material, the metal lithium is adopted as the negative electrode of the battery, so that the energy density of the battery can be improved, the theoretical capacity of the metal lithium is 3860mAh/g, and the theoretical capacity of graphite is only 372mAh/g, which is increased by about 10 times, so that the lithium ion battery has wider application field.
Although the use of metallic lithium as the negative electrode has such advantages, metallic lithium itself has a series of problems. Firstly, the texture of the metal lithium is soft, and the processing of the ultrathin metal lithium has technical difficulties. And secondly, dendrite problems are easy to generate in the cycle process of the metal lithium, so that the cycle life of the battery is limited.
In addition, when the lithium film is compounded on the support layer by adopting a rolling process, the lithium film is not easily firmly attached to the surface of the support layer due to a large difference between the surface properties of the support layer (e.g., plastic material) and the surface properties of the metallic lithium. If a large pressure (stress) is applied for firm adhesion, breakage of the lithium film or incomplete surface shape (breakage or void unevenness) is liable to be caused.
In view of this, there is a need for a lithium metal anode that can be produced in a stable amount and that can solve the cycle problem.
Disclosure of Invention
In view of the above problems, the inventors have conducted intensive studies and unexpectedly found that: by forming a specific modification layer on the surface of the bearing layer, the adhesion between the bearing layer and the metal lithium can be solved, so that the porous lithium film is easier to be adhered to the bearing layer, and the existence of the modification layer can provide uniform lithium ion deposition sites in the later period of battery cycling.
The inventors have also unexpectedly found that: for the lithium film used for the negative electrode, if the lithium film is provided with the through holes, due to the existence of the holes, the electrolyte can enter the lithium film more easily, the ion conductivity is improved, the specific surface area of the electrode is increased, and the rate performance of the battery can be greatly improved. Furthermore, the gas generated during formation can be released from the through holes, so that the battery failure caused by the problem of gas production in the later period of the battery is avoided. Therefore, the lithium film negative electrode having the through-hole can achieve better rate performance and battery stability than the ordinary lithium film. And a porous lithium film (thickness 0.5 to 1000 μm, even 1 to 20 μm) having through holes can be produced in a roll-to-roll manner by rolling. Due to the existence of the through holes, the accumulation of internal stress of the lithium film in the rolling process is relieved to a certain extent, so that the lithium film is not easy to deform, and a thinner and uniform-thickness lithium film (for example, 1-5 mu m) can be prepared.
Based on these findings, the present utility model has been completed.
One aspect of the present utility model provides a porous lithium membrane composite having:
a bearing layer;
a porous, lithium-philic layer on at least one surface of the support layer; and
a porous lithium membrane on the porous lithium-philic layer,
wherein the porous lithium film has a through-hole having a pore diameter of 5 to 200 μm.
Preferably, the porous lithium membrane has through holes having a pore diameter of 10 to 50 μm.
Preferably, the porous lithium film has through holes uniformly distributed throughout the lithium film.
In some embodiments, the porous lithium film has a porosity in the range of 0.1% to 20%, preferably in the range of 0.1% to 10%, more preferably in the range of 0.5% to 5%.
In some embodiments, the through-hole is circular or quasi-circular in shape.
In some embodiments, the pitch of the vias is in the range of 5 to 1000 μm, preferably in the range of 5 to 200 μm, more preferably in the range of 5 to 50 μm.
In some embodiments, the porous lithium film has a thickness in the range of 0.5 to 1000 μm.
In some embodiments, the porous lithium membrane composite has a bright lithium membrane surface that is silvery white, a lithium content of 99.90-99.95%, and a lithium element content of the lithium membrane body (interior) that may be 99.95% -99.99%. The lithium film thickness is in the range of 0.5 to 15 μm, preferably in the range of 1 to 10 μm, more preferably 5 μm or less, and the thickness tolerance is + -0.5 μm, preferably + -0.1 μm.
In some embodiments, the porous, lithium-philic layer has a porosity of 15% to 85%.
In some embodiments, the porous lithium-philic layer is formed by the mutual association of porous carbon particles, which are micron-sized particles having nano-sized pores inside and on the surface, formed by the interweaving of carbonaceous frameworks, including a crystallized carbon framework and an amorphous carbonaceous layer coated on the surface of the crystallized carbon framework.
In some embodiments, the porous carbon particles range in size from 1 micron to 50 microns and have a porosity of 15% to 85%.
In some embodiments, the porous lithium membrane composite is in the form of a tape.
In some embodiments, the porous lithium film is continuous or intermittent in length.
In some embodiments, the porous lithium film is continuous or intermittent in the width direction.
In some embodiments, when the porous lithium film is intermittent in the length direction, the porous lithium film includes empty spaces and lithium film spaces alternately arranged in the length direction, wherein the length of the metallic lithium film spaces is in the range of 1 to 2000mm, and the length of the empty spaces is in the range of 1 to 200mm, preferably in the range of 1 to 100 mm.
In some embodiments, when the porous lithium film is intermittent in the width direction, the porous lithium film includes lithium film regions and blank regions alternately arranged in the width direction, wherein the width of the lithium film regions is in the range of 1 to 200mm, and the width of the blank regions is in the range of 0.5 to 100 mm.
In some embodiments, the thickness of the support layer is in the range of 0.5 to 1000 μm, preferably in the range of 1 to 20 μm, more preferably in the range of 5 to 20 μm.
In some embodiments, the porous, lithium-philic layer has a thickness in the range of 0.5 to 5 μm.
In some embodiments, the porous lithium membrane composite is in the form of a coiled strip.
In the present utility model, the porous lithium film may be a uniform thin film. By homogeneous film is meant that the porous lithium film has a complete film shape, i.e. no significant wrinkles and deformations, and has a clean edge, and has a uniform thickness.
In some embodiments, the adhesion between the porous lithium membrane and the porous lithium-philic layer is between 400 and 800N-m -1 Preferably in the range of 600 to 800 N.m -1 Within a range of (2).
In some embodiments, the material of the bearing layer is selected from the group consisting of: and (2) polymer: such as polyimide, nylon, cellulose, polyolefin (polyethylene, polypropylene, polystyrene), polyester (polyethylene terephthalate, polybutylene terephthalate, polyarylate); inorganic oxide: such as aluminum oxide; an inorganic conductor: such as graphite, carbon nanotubes, graphene; metal current collector: such as copper, aluminum. Preferably, the carrier layer may have a single-layer structure or a multi-layer structure.
In some embodiments, the porous, lithium-philic layer is formed by:
(1) Mixing a first binder, a filler, a cross-linking agent and a first solvent to obtain a first slurry, carrying out atomization and granulation on the first slurry to obtain carbon particles, and carrying out high-temperature treatment on the carbon particles under the protection of inert atmosphere to obtain lithium-philic porous carbon particles; and
(2) Dispersing the lithium-philic porous carbon particles and a second binder in a second solvent to obtain a second slurry, coating the second slurry on the bearing layer and drying, thereby forming the porous lithium-philic layer on the bearing layer.
Preferably, in step (1), the mass ratio of the first binder, filler, crosslinking agent and first solvent is (4 to 15 parts): (10 to 30 parts): (0.1 to 15 parts): (20-400 parts).
Preferably, the high temperature treatment in step (1) is performed at a temperature in the range of 300 ℃ to 2000 ℃.
Preferably, the coating in step (2) is selected from spray coating, dip coating, transfer coating, extrusion coating, doctor blade coating, curtain coating and screen printing attachment.
Preferably, the first binder and the second binder are each independently selected from the group consisting of polyethylene and its modified polymers, organic alcohol polymers, organic acid polymers, polyesters and organosiloxanes. Preferably, the modified polymer of polyethylene includes polyvinyl alcohol, polyvinylidene fluoride, polybutene styrene, polystyrene and polyvinyl chloride; the organic alcohol polymer comprises polyethylene glycol, glycerol and a polymer of monosaccharide or polysaccharide; the organic acid polymer comprises polyacrylic acid; the polyesters include cyanoacrylates, polyurethanes, and methacrylates.
Preferably, the filler is selected from the group consisting of plastic particles, metal nanoparticles, metal oxides, metal nitrides, calcium carbonate, hydrous magnesium silicate, mica, hydrous silica and silica. Preferably, the plastic particles include polypropylene, polyethylene terephthalate, and polystyrene.
Preferably, the cross-linking agent is selected from the group consisting of high molecular polymers of acrylic acid-bonded allyl sucrose or pentaerythritol allyl ether, benzoyl peroxide, diethylenetriamine, hydrated sodium borate, cellulose derivatives and isothiazolinones.
Preferably, the first solvent and the second solvent are each independently selected from the group consisting of water, tetrachloroethylene, toluene, turpentine, acetone, methyl acetate, ethyl acetate, pentane, n-hexane, cyclohexane, octane, limonene, alcohol, xylene, toluene cyclohexanone, isopropanol, diethyl ether, propylene oxide, methyl butanone, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, acetonitrile, pyridine, phenol, and ethylenediamine.
In some embodiments, the porous lithium membrane complex is prepared by:
mixing a first binder, a filler, a cross-linking agent and a first solvent to obtain a first slurry, carrying out atomization and granulation on the first slurry to obtain carbon particles, and carrying out high-temperature treatment on the carbon particles under the protection of inert atmosphere to obtain lithium-philic porous carbon particles;
dispersing the lithium-philic porous carbon particles and a second binder in a second solvent to obtain a second slurry, coating the second slurry on the bearing layer and drying, thereby forming the porous lithium-philic layer on the bearing layer; and
a porous lithium film is composited onto the porous, lithium-philic layer by at least one of melt coating, atomic deposition, electroplating, and pressure compositing.
In some embodiments, the pressure compounding comprises rolling. The rolling includes cold rolling, hot rolling and clad rolling. Preferably, the temperature of the hot rolling is in the range of 60 to 120 ℃. Preferably, the clad-rolling comprises hot rolling before cold rolling.
In some embodiments, the rolling pressure is in the range of 0.1 to 150MPa, preferably in the range of 80 to 120 MPa.
In some embodiments, the roll surface has a release material. Preferably, the release material comprises polyethylene, polyoxymethylene, silicone polymers and ceramics.
In some embodiments, the roll is wound with a maximum tension in the range of 0.1 to 10N and the support roll itself is powered.
In an embodiment of the present utility model, by providing a porous lithium-philic layer, the adhesion between the support layer and the porous lithium film can ensure stable lamination of the porous lithium film on the support layer. And the present utility model obtains a composite body loaded with a uniform porous lithium film having through holes with a simple process due to the use of a porous lithium philic layer and a porous lithium film and control of a composite process. When the composite is used as a negative electrode of a battery, a high energy density and a long cycle life of the battery can be achieved.
Drawings
Fig. 1 is a schematic structural view of a porous lithium membrane composite according to the present utility model.
Fig. 2 is a schematic view of a production apparatus for producing the porous lithium membrane composite of the present utility model.
Fig. 3 is a schematic view of a porous lithium membrane composite in which the porous lithium membrane is intermittent in the width direction.
Fig. 4 is a schematic view of a porous lithium membrane composite in which the porous lithium membrane is intermittent in the length direction.
Fig. 5 is a schematic view of a production apparatus for producing a batch type lithium film.
Fig. 6 shows electrochemical test curves for the products of example 5 and comparative example 1.
Fig. 7 shows electrochemical test curves for the products of example 6 and comparative example 2.
Fig. 8 shows electrochemical test curves of the products in example 5 and comparative example 3.
Short for the sake of brevity:
p: substrate with porous lithium-philic layer
L: metallic lithium layer
PL: (continuous) lithium foil
PNL: intermittent lithium foil
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
Fig. 1 shows a schematic structure of a porous lithium membrane composite according to the present utility model, in which a porous lithium philic layer is applied on a support layer, followed by an ultra-thin porous lithium membrane layer.
Fig. 2 is a schematic view of a production apparatus for producing the continuous porous lithium membrane composite of the present utility model. As shown in fig. 2, using a metallic lithium strip material and a carrier strip material (having a porous lithium-philic layer on one side of the carrier strip material) as raw materials, unreeling is performed by an unreeling apparatus including at least a metallic lithium strip material unreeling roller 11 and two unreeling support rollers 12 for supporting the unreeled metallic lithium strip material and carrier strip material, respectively; the raw material lithium strip and the bearing strip (the stress control layer of the bearing strip faces the raw material lithium strip) pass through the unreeling support roller 12 and then enter the rolling mill 20; the rolling mill 20 comprises at least a pair of rollers 21 and a release coating 22 on the rollers 21, wherein the rolling pressure of the rolling mill 20 and the gap between the rollers 21 can be finely adjusted; the material of the release coating 22 on the roller 21 can be one or more selected from polyethylene, polyoxymethylene, silicone polymer, ceramic, etc. And compounding the bearing strip and the lithium material together through pressure compounding to form a porous lithium film compound product. The outlet side of the rolling mill 20 is provided with a winding device which at least comprises a supporting roller 31, a tension control roller 32 and a winding roller 33; wherein the supporting roller 31 is powered, and the porous lithium film complex can be pulled and advanced by using a small pulling force; the tension control roller 32 can move up and down or swing, and can control the tension of the composite body and control the winding speed of the winding roller 33 according to the height or swing angle of the tension control roller 32.
Fig. 3 is a schematic view of a porous lithium membrane composite in which a porous lithium membrane is intermittent in the width direction, and fig. 4 is a schematic view of a porous lithium membrane composite in which a porous lithium membrane is intermittent in the length direction.
Fig. 5 is a schematic view of a production apparatus for producing an intermittent lithium film, which includes an unreeling apparatus 100, a scraping apparatus 200, and a reeling apparatus 300, and further includes a control apparatus (not shown) for controlling a reeling speed and an operation time interval of the scraping apparatus.
The unreeling device 100 comprises an unreeling shaft 101, a magnetic powder brake 102, an unreeling supporting roller 104, an unreeling deviation correcting detection sensor 105 and an unreeling deviation correcting device 103. The unreeling shaft 101 on the unreeling device 100 is used for unreeling the lithium foil PL, and the magnetic powder brake 102 connected with the unreeling shaft 101 can control the magnitude of unreeling tension; the unreeling support roller 104 is used for supporting the lithium foil PL to enter the scraping device 200 at a constant inclination angle and facilitating the unreeling deviation correcting detection sensor 105 to accurately correct the deviation of the lithium foil PL.
The scraping device 200 comprises a scraper 201, a scraper drive 202, a scraper backing 203 and support rollers 204, 205. The supporting rollers 204 and 205 on the scraping device 200 respectively ensure that the inclination angle of the strip entering and exiting the device is constant and is not influenced by other process links; the scraper pad 203 is used for supporting the lithium foil PL and keeping the flat state of the lithium foil PL; the blade driving device 202 is used for driving the blade 201 to realize rapid movement in the up-down direction.
The winding device 300 comprises a winding shaft 301, a winding motor 302, a winding deviation rectifying device 303, a winding supporting roller 304 and a winding deviation rectifying detection sensor 305; in addition, a length measuring sensor 401 is also provided in some embodiments. The winding shaft 301 is used for winding the intermittent lithium foil PNL, and the winding shaft 301 is driven by a winding motor 302.
The specific using method and the flow are as follows: mounting and fixing the lithium foil PL with the base material support onto the unreeling shaft 101; the lithium foil PL is sequentially passed through the unreeling support roller 104, unreeling deviation correcting detection sensor 105, support rollers 204 and 205 of the scraping device, reeling deviation correcting detection sensor 305, reeling support roller 304, and then wound on the reeling shaft 301 and fixed. The device is opened, so that the winding motor 302 on the winding device 300 is operated to drive the winding shaft 301 to rotate, and the lithium foil PL is wound from the end of the unwinding device 100 through the scraping device 200. In the process of winding by the winding device 300, the doctor blade 201 is intermittently moved up and down by controlling the doctor blade driving device 202 in the doctor device 200, so that partial metal lithium layers on the lithium foil PL are scraped to form an intermittent lithium foil PNL, and the lithium film intermittent in the width direction or the length direction is produced by controlling the width and the number of the doctor blades.
Hereinafter, the present utility model will be described more specifically by way of examples using the above-mentioned process equipment. The structural parameters of the various products, the various reaction participants and the process conditions used in the following examples are typical examples, but the inventors have verified through a number of experiments that the structural parameters, the reaction participants and the process conditions are suitable for the other structural parameters, the reaction participants and the process conditions listed above, and the technical effects claimed in the present utility model can be achieved.
Example 1: preparation of lithium-philic porous carbon particles
The use mass ratio is 5:7:10:10: polyvinyl alcohol (Ala Ding Shiji (Shanghai) Co., ltd.), polystyrene microspheres (Su micro-Mich New Material Co., ltd.), carbon nanotubes (Shandong Dali, carbon tube model: GTC-304), isothiazolinone (Ala Ding Shiji (Shanghai) Co., ltd.) and deionized water were uniformly mixed to obtain a slurry having a solid content of 6%.
And atomizing and granulating the slurry by a two-fluid atomizer, wherein the pressure of carrier gas is 0.3MPa, and the temperature of an atomizing chamber is set to 220 ℃ to obtain carbon particles.
And (3) placing the carbon particles prepared by atomization and granulation into a crucible, and treating at a high temperature of 800 ℃ for 3 hours under the protection of inert atmosphere to obtain the lithium-philic porous carbon particles.
Example 2: preparation of the continuous porous lithium film Complex of the present utility model
The lithium-philic porous carbon particles prepared in example 1, carbon black and polyvinylidene fluoride (PVDF) were dispersed in N-methylpyrrolidone (NMP) at a mass ratio of 8:1:1 to obtain a slurry of lithium-philic porous carbon particles. The above slurry was coated on the surface of a copper foil having a thickness of 10 μm and dried, thereby forming a porous lithium-philic layer having a thickness of 5 μm on the surface of the copper foil.
The continuous porous lithium film composite having a thickness of 25 μm (thickness tolerance.+ -. 0.5 μm) was obtained by cold rolling a ultrathin lithium film (lithium content: 99.95%, thickness: 10 μm) and the above-mentioned copper foil with a porous, lithium-philic layer as raw materials at a pressure of 100MPa using the production apparatus shown in FIG. 2 and the process described above.
Example 3: preparation of intermittent porous lithium film Complex of the utility model
Using the production apparatus shown in fig. 5 and the process described above, a lithium foil (tape supporting substrate, lithium content: 99.95%, thickness: 10 μm) intermittent in the length direction was prepared.
The above-mentioned lithium foil and the copper foil with a porous lithium-philic layer as described in example 2 were used as raw materials, and hot-rolled at a temperature of 80℃and a pressure of 120MPa using a production apparatus as shown in FIG. 2 and a process as described above to obtain a porous lithium film composite having a thickness of 25 μm (thickness tolerance of.+ -. 0.5 μm) intermittently in the longitudinal direction.
Example 4: preparation of intermittent porous lithium film Complex of the utility model
Using the production apparatus shown in fig. 5 and the process described above, a lithium foil (tape supporting substrate, lithium content: 99.95%, thickness: 10 μm) intermittent in the width direction was prepared.
A porous lithium film composite having a thickness of 35 μm (thickness tolerance of ±0.5 μm) was produced in the same manner as in example 3, except that the lithium foil was replaced with the above-described lithium foil having a gap in the width direction and the copper foil was replaced with a polyethylene film (thickness: 20 μm) having a porous lithiaphilic layer of 5 μm.
Example 5: electrochemical test 1
The porous lithium membrane composite prepared in example 2 was punched into a 15.6cm diameter pole piece, and a half cell was formed with the lithium piece using 1M LiPF 6 The solution (fir electrolyte) in Ethylene Carbonate (EC)/dimethyl carbonate (DMC)/methylethyl carbonate (EMC) (1/1/1) was used as the electrolyte. At 1mA/cm 2 ，1mAh/cm 2 The cycle performance was tested.
Example 6: electrochemical test 2
The porous lithium membrane composite prepared in example 2 was punched into a 15.6cm diameter pole piece, and a half cell was formed with the lithium piece using 1M LiPF 6 The solution (fir electrolyte) in Ethylene Carbonate (EC)/dimethyl carbonate (DMC)/methylethyl carbonate (EMC) (1/1/1) was used as the electrolyte. At 5mA/cm 2 ，5mAh/cm 2 And testing the multiplying power performance.
Comparative example 1:
a lithium copper composite tape (10 μm copper foil, 10 μm lithium tape, available from Tianjin) with a thickness of 20 μm was punched into a 15.6cm diameter pole piece, and a half cell was formed with the lithium piece, using 1M LiPF 6 The solution in EC/DMC/EMC (1/1/1) (fir electrolyte) was used as electrolyte.
The cycle performance was tested in the same manner as in example 5.
Fig. 6 shows electrochemical test curves for the products of example 5 and comparative example 1. As can be seen from fig. 6, the cycle time reaches 315h with a porous, lithium-philic layer, whereas the cycle time is only 160h without a porous, lithium-philic layer. It was thus demonstrated that the cycle performance of a battery can be improved using the porous lithium film composite of the present utility model.
Comparative example 2:
a lithium tape having a thickness of 2 μm was formed on a copper foil having a thickness of 10 μm by vapor deposition, to obtain a lithium copper composite tape having a thickness of 12 μm. The lithium band in the lithium copper composite band obtained by the method is compact and nonporous. Punching the lithium copper composite strip into a pole piece with the diameter of 15.6cm, and forming a half battery with the lithium piece, wherein 1M LiPF is adopted 6 The solution in EC/DMC/EMC (1/1/1) (fir electrolyte) was used as electrolyte.
The rate performance was tested in the same manner as in example 6.
Fig. 7 shows electrochemical test curves for the products of example 6 and comparative example 2. As can be seen from fig. 7, the microporous lithium tape of the present utility model achieves better rate performance relative to the nonporous lithium tape.
Comparative example 3:
a20 μm thick lithium copper composite tape was obtained by bonding a 10 μm thick copper foil and a 10 μm thick lithium tape (available from Tianjin) with a graphite conductive paste (available from Nanjing, inc.). Punching the lithium copper composite strip into a pole piece with the diameter of 15.6cm, and forming a half battery with the lithium piece, wherein 1M LiPF is adopted 6 The solution in EC/DMC/EMC (1/1/1) (fir electrolyte) was used as electrolyte.
The cycle performance was tested in the same manner as in example 5.
Fig. 8 shows electrochemical test curves of the products in example 5 and comparative example 3. As can be seen from fig. 8, the composite lithium tape with the porous lithium-philic layer of the present utility model has a lower overpotential, indicating that the resistance is smaller and the battery performance is more advantageous than the lithium-copper composite tape using the conductive paste to improve the adhesion.
Performance test:
test temperature using an AR-1000 universal adhesion tester: 25+ -5deg.C, speed: 15cm/min, test angle: 120 DEG, bonding the porous lithium film by a 3M adhesive tape, fixing a bearing layer, separating by pulling force, and testing the pulling force during separation. The ultra-thin metallic lithium composites produced in examples 2 to 4 and comparative example 1 were tested for adhesion and the results are shown in table 1.
Adhesion test table 1
| Product name | With or without porous lithium-philic layers | Cohesive force (N/m) |
| Example 2 | (Continuous) | 765 |
| Example 3 | Intermittent type | 762 |
| Example 4 | Intermittent type | 721 |
| Comparative example 1 | (Continuous) | 20 |
| Comparative example 2 | Without any means for | 794 |
| Comparative example 3 | Without any means for | 647 |
As can be seen from table 1: through the modification of the lithium, the binding force of the lithium film can be effectively increased, so that the binding force between the bearing layer and the lithium film is greatly improved, and the stable use of the metal lithium cathode is utilized.
It should be understood that the foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the utility model, but is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (10)
1. A porous lithium membrane composite, characterized in that the porous lithium membrane composite has:
a bearing layer;
a porous, lithium-philic layer on at least one surface of the support layer; and
a porous lithium membrane on the porous lithium-philic layer,
wherein the porous lithium film has a through-hole having a pore diameter of 5 to 200 μm.
2. The porous lithium membrane composite of claim 1, wherein the porous lithium membrane has a porosity in the range of 0.1% to 20%.
3. The porous lithium film composite according to claim 1, wherein the pitch of the through holes is in the range of 5 to 1000 μm.
4. The porous lithium membrane composite of claim 1, wherein the porous lithium membrane has a thickness in the range of 0.5 to 1000 μιη.
5. The porous lithium membrane composite of claim 1, wherein the porous, lithiated layer has a porosity of 15% to 85%.
6. The porous lithium membrane composite of claim 1, wherein the porous lithium-philic layer is formed of porous carbon particles that are inter-linked.
7. The porous lithium membrane composite of claim 1, wherein the porous lithium membrane composite is in the form of a tape, the porous lithium membrane being continuous or intermittent in length; or the porous lithium film is continuous or intermittent in the width direction.
8. The porous lithium membrane composite according to claim 7, wherein,
when the porous lithium film is intermittent in the length direction, the porous lithium film includes blank areas and lithium film areas alternately arranged in the length direction, wherein the length of the lithium film areas is in the range of 1 to 2000mm, and the length of the blank areas is in the range of 1 to 200 mm; and is also provided with
When the porous lithium film is intermittent in the width direction, the porous lithium film includes lithium film regions and blank regions alternately arranged in the width direction, wherein the width of the lithium film regions is in the range of 1 to 200mm, and the width of the blank regions is in the range of 0.5 to 100 mm.
9. The porous lithium membrane composite according to claim 1, wherein the thickness of the support layer is in the range of 0.5 to 1000 μιη and/or the thickness of the porous lithium philic layer is in the range of 0.5 to 5 μιη.
10. The porous lithium membrane composite of claim 1, wherein the porous lithium membrane composite is in the form of a rolled strip.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116826025A (en) * | 2023-08-22 | 2023-09-29 | 天津中能锂业有限公司 | Lithium composite and method for producing same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116826025A (en) * | 2023-08-22 | 2023-09-29 | 天津中能锂业有限公司 | Lithium composite and method for producing same |
| CN116826025B (en) * | 2023-08-22 | 2023-12-01 | 天津中能锂业有限公司 | Lithium composite and method for producing same |
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