CN106159169A - A kind of lithium ion battery and preparation method thereof - Google Patents
A kind of lithium ion battery and preparation method thereof Download PDFInfo
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- CN106159169A CN106159169A CN201610541917.1A CN201610541917A CN106159169A CN 106159169 A CN106159169 A CN 106159169A CN 201610541917 A CN201610541917 A CN 201610541917A CN 106159169 A CN106159169 A CN 106159169A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/80—Porous plates, e.g. sintered carriers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
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- 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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- 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
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Abstract
The invention belongs to technical field of lithium ion, particularly relate to a kind of lithium ion battery and preparation method thereof；This lithium ion battery includes negative plate, and it includes metal forming net and the lithium sedimentary being deposited on described metal forming net surface；Positive plate, it includes plus plate current-collecting body and is arranged on the anode active material layer on described anode collection surface；Isolating membrane, is used for being spaced described positive plate and described negative plate, and it includes isolating membrane matrix and the adhesive polymer being coated in described isolating membrane matrix at least one side；And electrolyte.Compared with prior art, negative electrode metallic foil net of the present invention and bonding isolating membrane have good bond effect, improve impedance and the concordance at interface, decrease the difference of charging process electric current density, thus the Li dendrite safety problem efficiently solving lithium ion nonuniform deposition on negative plate and causing, improve cycle performance and the service life of battery.
Description
Technical field
The invention belongs to technical field of lithium ion, particularly relate to a kind of lithium ion battery and preparation method thereof.
Background technology
Along with the development of new energy technology, the advanced energy storage equipment with high-energy-density is more and more closed
Note.But, existing lithium rechargeable battery cannot meet the advanced energy storage equipment requirement to its high-energy-density.Metal
Cathode of lithium becomes high-energy density lithium secondary by its high specific capacity (3860mAh/g) and the most negative electromotive force (-3.04V)
The focus of battery research.Wherein, lithium metal secondary battery includes lithium-sulfur cell, lithium-air battery, lithiated intercalation compound battery, lithium
Oxide cell etc..
As a kind of battery energy storage system with important research prospect, lithium metal battery causes science and industrial circle is ground
Study carefully the very big concern of personnel.The subject matter limiting lithium anode application at present is the dendritic growth in charging process.One side
Face, dendritic growth can cause battery short circuit, thus cause a series of security incidents such as battery system thermal runaway, electrolyte catch fire；
On the other hand, dendritic growth adds the reactivity of lithium metal and negative pole, consumes active substance, causes battery utilization rate
Decline.Dendritic growth, mainly due to the lithium ion skewness on negative plate-diaphragm interface, causes negative pole currect collecting surface
Lithium ion uneven deposition over time and space, form dendritic Li dendrite.Along with the increase of cycle-index, Li dendrite
Can drastically grow and penetrate barrier film and and positive contact, cause short circuit and the inefficacy of battery.Research shows, negative pole and barrier film, just
Interface between pole and barrier film can affect the internal resistance of battery core local, causes the difference of charging process electric current density, thus causes lithium
The nonuniform deposition of ion.It is to say, pole piece is the poorest with the bond effect of barrier film, the concordance at interface between barrier film and pole piece
The poorest, thus cause the probability of lithium ion generation nonuniform deposition the biggest.Therefore, how to keep in charge and discharge process
The concordance of battery core internal interface becomes the direction improving Li dendrite safety problem.
At present, some battery enterprises are by improving the interface between both positive and negative polarity and barrier film (as specially at barrier film coating PVDF
The Chinese patent of profit Application No. 201510966521.7), although the bond effect between positive pole and barrier film has obtained effectively changing
Kind, but between negative metal lithium and PVDF, adhesive effect is poor, causes negative pole poor with the interface of barrier film, thus affects following of battery
Ring performance.
In view of this, necessary make existing lithium ion battery and preparation method thereof is further improved, to solve
The cathode of lithium interface consistency that cause poor with barrier film bond effect is poor, thus causes the nonuniform deposition problem of lithium ion.
Summary of the invention
It is an object of the invention to: poor for the cycle performance of lithium ion battery using lithium anode in prior art,
The deficiency that safety is low, and a kind of lithium ion battery that can improve lithium anode and isolating membrane adhesive property is provided, thus
Improve the nonuniform deposition problem of lithium ion, reduce the generation of Li dendrite, improve cyclicity and the safety of lithium ion battery.
To achieve these goals, the present invention uses solution below:
A kind of lithium ion battery, including negative plate, it includes metal forming net and is deposited on described metal forming net surface
Lithium sedimentary；Positive plate, it includes plus plate current-collecting body and is arranged on the positive electrode active materials on described anode collection surface
Layer；Isolating membrane, is used for being spaced described positive plate and described negative plate, and it includes isolating membrane matrix and is coated in described isolating membrane base
Adhesive polymer in body at least one side；And electrolyte.
The present invention use the metal forming of punching as negative electrode collector, and the isolation processed through adhesive polymer by surface
Both positive and negative polarity pole piece is bonded together by film.Therefore, the present invention, by negative electrode metallic foil net and the combination of bonding isolating membrane, improves
The impedance at interface and concordance, decrease the difference of charging process electric current density, thus efficiently solve lithium ion at negative plate
On nonuniform deposition and the Li dendrite safety problem that causes, improve cycle performance and the service life of battery simultaneously.
Preferably, the thickness of described metal forming net is 4～20 μm.
Preferably, the percent opening of described metal forming net is 40～80%, and the pore size of described mesh is 0.01～1000 μ
m.Wherein it is desired to explanation, without mesh, the bonding force between negative plate and isolating membrane is poor, through discharge and recharge repeatedly
After, the interface between negative plate and isolating membrane can be deteriorated；And use the meshed metal foil current collector of tool, gluing of isolating membrane surface
Close polymer then to be bonded together with pole piece by mesh.And the too high mechanical strength that can affect metal forming of percent opening；Open
The too low adhesive strength then affected between both positive and negative polarity pole piece and isolating membrane of porosity.Additionally, mesh is excessive is unfavorable for that lithium is at paper tinsel net base
Deposition on material；And the too small meeting of mesh makes isolating membrane cannot be bonded to each other with negative plate by mesh.
Preferably, the material of described metal forming net is copper, nickel or rustless steel.
Preferably, the mesh form of described metal forming net be provided in round, oval or polygon.Wherein, mesh
Shape can arbitrarily be arranged, and the effect of mesh mainly improves the bond effect of negative plate and isolating membrane, and the deposition for lithium carries simultaneously
For more bearing space, to improve the energy density of negative plate.
Preferably, at least one during described adhesive polymer is PVDF, SBR, PMMA, PAA and PAN.Isolating membrane matrix
The above-mentioned adhesive polymer of surface-coated, makes this isolating membrane can have stronger bonding force with positive plate, negative plate respectively, and bonding
Effect is the best then represents that the interface between isolating membrane and pole piece is the best.
Preferably, described isolating membrane matrix is at least one in polyethylene, polypropylene, polyimides and non-woven fabrics.
Preferably, described anode active material layer includes positive active material, conductive agent and binding agent, described positive-active
Material is at least one in cobalt acid lithium, lithium nickelate, LiMn2O4, nickle cobalt lithium manganate and LiFePO4.
Another object of the present invention is to provide the preparation method of a kind of above-mentioned lithium ion battery, this preparation method include with
Lower step:
Step one: be wound into naked battery core after described positive plate, described isolating membrane and described metal forming net being stacked gradually, will
Described electrolyte is injected after the encapsulation of described naked battery core；
Step 2: step one gained battery is pressed in the face of 0.4～1.2MPa and enters under the temperature conditions of 40 DEG C～120 DEG C
Row fixture shaping, makes described isolating membrane be compacted bonding with described positive plate, described metal forming net respectively；
Step 3: step 2 gained battery is added pressure at fixture and is pre-charged, and control the electric current of described precharge
Size is 0.01C～1C, makes described metal forming net form the lithium sedimentary of densification, i.e. obtains described lithium ion battery.
Wherein, the surface density of lithium sedimentary described in step 3 is 5～100g/m2.If the surface density of lithium sedimentary is too high
The transmission speed of lithium ion can be affected, and isolating membrane can be made to be deteriorated with the adhesive effect of pole piece.
The beneficial effects of the present invention is:
1) one lithium ion battery of the present invention, including negative plate, it includes metal forming net and is deposited on described metal forming net
Lithium sedimentary on surface；Positive plate, it includes plus plate current-collecting body and is arranged on the positive pole on described anode collection surface
Active material layer；Isolating membrane, is used for being spaced described positive plate and described negative plate, and it includes isolating membrane matrix and is coated in described
Adhesive polymer in isolating membrane matrix at least one side；And electrolyte.The present invention uses the metal forming of punching as negative pole collection
Electricity body, and positive/negative plate bonded together by the isolating membrane processed through adhesive polymer by surface.Therefore, the present invention is by negative
Pole metal forming net and the combination of bonding isolating membrane, improve impedance and the concordance at interface, decrease charging process electric current density
Difference, thus the Li dendrite safety problem efficiently solving lithium ion nonuniform deposition on negative plate and causing, improve
The cycle performance of battery and service life.
2) present invention uses sedimentation the lithium of positive pole to deposit to negative electrode metallic foil on the net, forms complete negative plate, institute
With preparation method simple process, easily operated.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention and beneficial effect thereof are further described, but, the present invention
Embodiment be not limited to this.
Embodiment 1
The preparation of positive plate:
Cobalt acid lithium (positive active material), conductive agent superconduction carbon (Super-P), binding agent Kynoar (PVDF) are pressed
Mass ratio 97:1.5:1.5 mix homogeneously is made has certain viscosity anode sizing agent, is coated in current collector aluminum foil by slurry, so
After dry at 110 DEG C after carry out colding pressing, trimming, cut-parts, point bar, tab welding, i.e. make based lithium-ion battery positive plate.
The preparation of negative electrode metallic foil net:
Take the metal copper sheet that a thickness is 12 μm, then with perforating press, this metal copper sheet is punched out, being shaped as of hole
Circle, the size in aperture is 100 μm, and percent opening is 60%, metal forming net.
The preparation of isolating membrane:
Take polyethylene micropore thin film that thickness is 10 μm as isolating membrane base material；It is coated with one on the two sides of isolating membrane base material
Layer thickness is the PVDF adhesive coatings of 4 μm, i.e. makes lithium ion battery isolating membrane.
The preparation of electrolyte: by lithium hexafluoro phosphate (LiPF6) to be dissolved in by mass ratio be the ethylene carbonate of 1:1:1
(EC), in the mixed solvent that forms of dimethyl carbonate (DMC) and Ethyl methyl carbonate (EMC), hexafluorophosphoric acid lithium concentration is i.e. obtained
Electrolyte for 1.0mol/L.
The preparation of lithium ion battery:
1) it is wound into naked battery core after positive plate, isolating membrane and metal forming net being stacked gradually, naked battery core aluminum plastic film is sealed
Electrolyte is injected after dress；
2) by step 1) gained battery carries out fixture shaping under the face of 1.0MPa pressure and the temperature conditions of 100 DEG C, make every
It is compacted bonding with positive plate, metal forming net respectively from film；
3) by step 2) gained battery adds pressure at fixture and is pre-charged, and the size of current controlling precharge is
0.5C, makes metal forming net form the lithium sedimentary of densification, and the surface density of lithium sedimentary is 50g/m2, after through chemical conversion, capacity etc.
Operation, makes lithium ion battery.
Embodiment 2
The preparation of isolating membrane as different from Example 1:
Take polyethylene micropore thin film that thickness is 10 μm as isolating membrane base material；One side at isolating membrane base material coats one layer
Thickness is the PVDF adhesive coatings of 4 μm, i.e. makes lithium ion battery isolating membrane.
Remaining, with embodiment 1, repeats no more here.
Embodiment 3
The preparation of isolating membrane as different from Example 1:
Take polypropylene microporous film that thickness is 10 μm as isolating membrane base material；It is coated with one on the two sides of isolating membrane base material
Layer thickness is the PMMA adhesive coatings of 4 μm, i.e. makes lithium ion battery isolating membrane.
Remaining, with embodiment 1, repeats no more here.
Embodiment 4
The preparation of isolating membrane as different from Example 1:
Take polyimides microporous membrane that thickness is 10 μm as isolating membrane base material；It is coated with on the two sides of isolating membrane base material
A layer thickness is the PAA adhesive coatings of 4 μm, i.e. makes lithium ion battery isolating membrane.
Remaining, with embodiment 1, repeats no more here.
Embodiment 5
The preparation of isolating membrane as different from Example 1:
Take non-woven fabrics that thickness is 10 μm as isolating membrane base material；Being coated with a layer thickness on the two sides of isolating membrane base material is
The PAN adhesive coatings of 4 μm, i.e. makes lithium ion battery isolating membrane.
Remaining, with embodiment 1, repeats no more here.
Embodiment 6
The preparation of negative electrode metallic foil net as different from Example 1:
Take the metal nickel sheet that a thickness is 12 μm, then with perforating press, this metal nickel sheet is punched out, being shaped as of hole
Square, the length of side in hole is 20 μm, and percent opening is 40%, metal forming net.
Remaining, with embodiment 1, repeats no more here.
Embodiment 7
The preparation of negative electrode metallic foil net as different from Example 1:
Take the metal nickel sheet that a thickness is 12 μm, then with perforating press, this metal nickel sheet is punched out, being shaped as of hole
Circle, the size in aperture is 1000 μm, and percent opening is 50%, metal forming net.
Remaining, with embodiment 1, repeats no more here.
Embodiment 8
The preparation of negative electrode metallic foil net as different from Example 1:
Take the stainless steel substrates that a thickness is 12 μm, then with perforating press, this stainless steel substrates is punched out, being shaped as of hole
Circle, the size in aperture is 0.01 μm, and percent opening is 80%, metal forming net.
Remaining, with embodiment 1, repeats no more here.
Embodiment 9
The preparation of lithium ion battery as different from Example 1:
1) it is wound into naked battery core after positive plate, isolating membrane and metal forming net being stacked gradually, naked battery core aluminum plastic film is sealed
Electrolyte is injected after dress；
2) by step 1) gained battery carries out fixture shaping under the face of 0.4MPa pressure and the temperature conditions of 40 DEG C, makes isolation
Film is compacted bonding with positive plate, metal forming net respectively；
3) by step 2) gained battery adds pressure at fixture and is pre-charged, and the size of current controlling precharge is
0.01C, makes metal forming net form the lithium sedimentary of densification, and the surface density of lithium sedimentary is 100g/m2, after through chemical conversion, capacity
Etc. operation, make lithium ion battery.
Remaining, with embodiment 1, repeats no more here.
Embodiment 10
The preparation of lithium ion battery as different from Example 1:
1) it is wound into naked battery core after positive plate, isolating membrane and metal forming net being stacked gradually, naked battery core aluminum plastic film is sealed
Electrolyte is injected after dress；
2) by step 1) gained battery carries out fixture shaping under the face of 1.2MPa pressure and the temperature conditions of 120 DEG C, make every
It is compacted bonding with positive plate, metal forming net respectively from film；
3) by step 2) gained battery adds pressure at fixture and is pre-charged, and the size of current controlling precharge is 1C,
Making metal forming net form the lithium sedimentary of densification, the surface density of lithium sedimentary is 5g/m2, after through the operations such as chemical conversion, capacity, system
Become lithium ion battery.
Remaining, with embodiment 1, repeats no more here.
Comparative example 1
Negative plate and the preparation of isolating membrane as different from Example 1:
The preparation of negative plate:
By graphite and conductive agent superconduction carbon (Super-P), thickening agent sodium carboxymethyl cellulose (CMC), binding agent butylbenzene rubber
Glue (SBR) 96:1.5:1.0:1.5 in mass ratio makes cathode size, is coated on copper foil of affluxion body by slurry, then at 85 DEG C
Carry out after lower drying colding pressing, trimming, cut-parts, point bar, tab welding, i.e. make anode plate for lithium ionic cell.
The preparation of isolating membrane: directly take polyethylene micropore thin film that thickness is 18 μm as isolating membrane, remaining same embodiment
1, repeat no more here.
Comparative example 2
Negative plate and the preparation of isolating membrane as different from Example 1:
The preparation of negative plate:
By graphite and conductive agent superconduction carbon (Super-P), thickening agent sodium carboxymethyl cellulose (CMC), binding agent butylbenzene rubber
Glue (SBR) 96:1.5:1.0:1.5 in mass ratio makes cathode size, is coated on copper foil of affluxion body by slurry, then at 85 DEG C
Carry out after lower drying colding pressing, trimming, cut-parts, point bar, tab welding, make anode plate for lithium ionic cell.
The preparation of isolating membrane: take polyethylene micropore thin film that thickness is 10 μm as isolating membrane base material, then at isolating membrane
The two sides of base material is coated with the aluminum oxide ceramic coating that a layer thickness is 4 μm, i.e. makes lithium ion battery isolating membrane.
Remaining, with embodiment 1, repeats no more here.
Comparative example 3
Negative plate and the preparation of isolating membrane as different from Example 1:
The preparation of negative plate:
By graphite and conductive agent superconduction carbon (Super-P), thickening agent sodium carboxymethyl cellulose (CMC), binding agent butylbenzene rubber
Glue (SBR) 96:1.5:1.0:1.5 in mass ratio makes cathode size, is coated on copper foil of affluxion body by slurry, then at 85 DEG C
Carry out after lower drying colding pressing, trimming, cut-parts, point bar, tab welding, make anode plate for lithium ionic cell.
The preparation of isolating membrane:
Take polyethylene micropore thin film that thickness is 10 μm as isolating membrane base material；It is coated with one on the two sides of isolating membrane base material
Layer thickness is the PVDF adhesive coatings of 4 μm, i.e. makes lithium ion battery isolating membrane.
Remaining, with embodiment 1, repeats no more here.
Respectively the lithium ion battery obtained by embodiment 1～10 and comparative example 1～3 is carried out the internal resistance of cell, cycle performance,
High temperature storage and coulombic efficiency test.
Wherein, cycle performance test: lithium ion battery uses at 25 DEG C the multiplying power of 0.5C charge, and the multiplying power of 0.5C is put
Electricity, carries out 100 circulations successively, and the at room temperature capacity of battery under test 0.5C, and battery room temperature capacity front with circulation is carried out
Relatively, calculating capability retention after circulation, the computing formula of capability retention is as follows: capability retention=(battery under 0.5C
Battery room temperature capacity before capacity/circulation) × 100%.
High temperature storage is tested: lithium ion battery is being carried out 60 DEG C of storages at 4.2v, and the storage time is 30 days, and record is deposited
The thickness of battery before and after storage, and its computing formula of thickness swelling calculating battery is as follows: thickness swelling=[(electricity after storage
Cell thickness before pond thickness-storage) the front cell thickness of/storage] × 100%.
Test result is shown in Table 1.
Table 1 embodiment and comparative example lithium ion battery internal resistance, cycle performance, coulombic efficiency and high temperature storage test result
| Group | Internal resistance (m Ω) | Circulation volume conservation rate (100 circulations) | Coulombic efficiency (the 100th circulation) | Thickness swelling |
| Embodiment 1 | 34 | 89.5% | 99.68% | 6% |
| Embodiment 2 | 36 | 89.9% | 99.65% | 2% |
| Embodiment 3 | 38 | 91.5% | 99.72% | 3% |
| Embodiment 4 | 36 | 92.0% | 99.75% | 5% |
| Embodiment 5 | 37 | 94.0% | 99.80% | 4% |
| Embodiment 6 | 35 | 93.8% | 99.88% | 7% |
| Embodiment 7 | 33 | 94.2% | 99.70% | 2% |
| Embodiment 8 | 34 | 93.9% | 99.69% | 8% |
| Embodiment 9 | 37 | 94.2% | 99.68% | 6% |
| Embodiment 10 | 35 | 92.9% | 99.83% | 5% |
| Comparative example 1 | 52 | 87.6% | 97.50% | 27% |
| Comparative example 2 | 53 | 86.2% | 97.29% | 20% |
| Comparative example 3 | 48 | 88.0% | 98.78% | 18% |
By above-mentioned table 1 it can be seen that relative to comparative example 1～3, lithium ion battery of the present invention has lower interface internal resistance
Lower thickness swelling, and cycle performance and coulombic efficiency are also significantly better than comparative example.Reason is that the present invention passes through to bear
Effective combination of the isolating membrane of pole metal forming net and surface-coated adhesive polymer, it is possible to effectively reduce impedance and the raising at interface
The concordance at interface, reduces the difference of electric current density in charging process, thus efficiently solves lithium ion on negative plate not
Uniform deposition and the Li dendrite safety problem that causes, improve cycle performance and the service life of battery.
The announcement of book and teaching according to the above description, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula changes and revises.Therefore, the invention is not limited in that above-mentioned detailed description of the invention, every those skilled in the art exist
Any conspicuously improved, replacement done on the basis of the present invention or modification belong to protection scope of the present invention.This
Outward, although employing some specific terms in this specification, but these terms are merely for convenience of description, not to the present invention
Constitute any restriction.
Claims (10)
1. a lithium ion battery, it is characterised in that: include
Negative plate, it includes metal forming net and the lithium sedimentary being deposited on described metal forming net surface；
Positive plate, it includes plus plate current-collecting body and is arranged on the anode active material layer on described anode collection surface；
Isolating membrane, is used for being spaced described positive plate and described negative plate, and it includes isolating membrane matrix and is coated in described isolating membrane
Adhesive polymer in matrix at least one side；And electrolyte.
A kind of lithium ion battery the most according to claim 1, it is characterised in that: the thickness of described metal forming net is 4 ~ 20 μ
m。
A kind of lithium ion battery the most according to claim 1, it is characterised in that: the percent opening of described metal forming net is 40 ~
80%, the pore size of described mesh is 0.01 ~ 1000 μm.
A kind of lithium ion battery the most according to claim 1, it is characterised in that: the material of described metal forming net is copper, nickel
Or rustless steel.
A kind of lithium ion battery the most according to claim 1, it is characterised in that: the mesh form of described metal forming net is arranged
For circular, oval or polygon.
A kind of lithium ion battery the most according to claim 1, it is characterised in that: described adhesive polymer is PVDF, SBR,
At least one in PMMA, PAA and PAN.
A kind of lithium ion battery the most according to claim 1, it is characterised in that: described isolating membrane matrix is polyethylene, gathers
At least one in propylene, polyimides and non-woven fabrics.
A kind of lithium ion battery the most according to claim 1, it is characterised in that: described anode active material layer includes positive pole
Active substance, conductive agent and binding agent, described positive active material is cobalt acid lithium, lithium nickelate, LiMn2O4, nickle cobalt lithium manganate and phosphorus
At least one in acid ferrum lithium.
9. the preparation method of the lithium ion battery described in an any one of claim 1 ~ 8, it is characterised in that include following step
Rapid:
Step one: be wound into naked battery core, by described after described positive plate, described isolating membrane and described metal forming net being stacked gradually
Described electrolyte is injected after the encapsulation of naked battery core；
Step 2: step one gained battery is pressed in the face of 0.4 ~ 1.2MPa and carries out fixture under the temperature conditions of 40 DEG C ~ 120 DEG C
Shaping, makes described isolating membrane be compacted bonding with described positive plate, described metal forming net respectively；
Step 3: step 2 gained battery is added pressure at fixture and is pre-charged, and control the size of current of described precharge
For 0.01C ~ 1C, make described metal forming net form the lithium sedimentary of densification, i.e. obtain described lithium ion battery.
The preparation method of a kind of lithium ion battery the most according to claim 9, it is characterised in that: lithium described in step 3
The surface density of sedimentary is 5 ~ 100g/m2。
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109273668A (en) * | 2018-09-27 | 2019-01-25 | 宁德新能源科技有限公司 | Cathode pole piece and electrochemical appliance comprising it |
| CN113690402A (en) * | 2021-08-09 | 2021-11-23 | 武汉理工大学 | Lithium ion battery, lithium ion battery cathode and preparation method thereof |
| CN114824441A (en) * | 2022-05-09 | 2022-07-29 | 江苏正力新能电池技术有限公司 | Battery core, battery module and battery pack |
| CN115832606A (en) * | 2022-11-23 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | Isolation film, lithium ion battery, battery module, battery pack and electric device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109273668A (en) * | 2018-09-27 | 2019-01-25 | 宁德新能源科技有限公司 | Cathode pole piece and electrochemical appliance comprising it |
| CN109273668B (en) * | 2018-09-27 | 2021-04-06 | 宁德新能源科技有限公司 | Negative pole piece and electrochemical device comprising same |
| US11316167B2 (en) | 2018-09-27 | 2022-04-26 | Ningde Amperex Technology Limited | Anode electrode and electrochemical device containing the same |
| CN113690402A (en) * | 2021-08-09 | 2021-11-23 | 武汉理工大学 | Lithium ion battery, lithium ion battery cathode and preparation method thereof |
| CN113690402B (en) * | 2021-08-09 | 2022-08-23 | 武汉理工大学 | Lithium ion battery, lithium ion battery cathode and preparation method thereof |
| CN114824441A (en) * | 2022-05-09 | 2022-07-29 | 江苏正力新能电池技术有限公司 | Battery core, battery module and battery pack |
| CN115832606A (en) * | 2022-11-23 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | Isolation film, lithium ion battery, battery module, battery pack and electric device |
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