CN107732146A - A kind of electrodes of lithium-ion batteries and preparation method thereof, lithium ion battery - Google Patents

A kind of electrodes of lithium-ion batteries and preparation method thereof, lithium ion battery Download PDF

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Publication number
CN107732146A
CN107732146A CN201710936494.8A CN201710936494A CN107732146A CN 107732146 A CN107732146 A CN 107732146A CN 201710936494 A CN201710936494 A CN 201710936494A CN 107732146 A CN107732146 A CN 107732146A
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CN
China
Prior art keywords
lithium
electrodes
thickness
ion batteries
surface density
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.)
Pending
Application number
CN201710936494.8A
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Chinese (zh)
Inventor
杨利
郑喜军
刘景超
郭龙超
牛多兵
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Aviation Lithium Battery Co Ltd
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China Aviation Lithium Battery Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by China Aviation Lithium Battery Co Ltd filed Critical China Aviation Lithium Battery Co Ltd
Priority to CN201710936494.8A priority Critical patent/CN107732146A/en
Publication of CN107732146A publication Critical patent/CN107732146A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • 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
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • 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 present invention relates to a kind of electrodes of lithium-ion batteries and preparation method thereof, lithium ion battery.The electrodes of lithium-ion batteries, including collector and active material layer, in roll-in direction of advance, the surface density of pole piece two end portions is less than the surface density of center section.The electrodes of lithium-ion batteries of the offer of the present invention, designed by the differentiation of pole piece both ends and center section surface density, make pole piece both ends and center section be compacted difference in roll-in to minimize, lift the uniformity of compacted density, the limit is arrived into the overall compacted density lifting of pole piece, and then improve battery energy density and uniformity, while avoid because fold caused by the compacting of pole piece both ends is excessive, damage by pressure phenomena such as.

Description

A kind of electrodes of lithium-ion batteries and preparation method thereof, lithium ion battery
Technical field
The invention belongs to the preparation field of electrodes of lithium-ion batteries, and in particular to a kind of electrodes of lithium-ion batteries and its preparation Method, lithium ion battery.
Background technology
Lithium ion battery because having the characteristics that energy density is high, having extended cycle life, it is green be widely used in automobile, The field such as consumption electronic product and energy storage.Requirement more and more higher of the people to battery energy density at present, when respective battery designs Align the requirement more and more higher of the compacted density of cathode pole piece；On the other hand, in the groups of needs of battery, to the consistent of battery Property it is also proposed higher and higher requirement.The demand proposes higher requirement to the technology of preparing of lithium battery positive-negative plate.
As shown in figure 1, during conventional film-making, the coating thickness of the active material layer 2 on collector 1 longitudinally and transversely on It is consistent.As shown in Figure 2 to 4, topping roll 30 and bottom roll 31 carry out roll-in after the regulation of roll adjustment structure 6, due to The limitation of roll-in machine equipment rigidity and roll deformation drag, deflection deformation can be produced after roll stress during roll-in, causes pole piece The phenomenon of the thin thick middle in both ends is presented in roll-in thickness.So after compression, pole piece two end portions are compacted, pole piece big compared with center section Two end regions can first reach the compacting limit than intermediate region, and to make pole piece intermediate region reach design compacting, the two of pole piece End regions necessarily exceed design compacting.
The design compacting of pole piece at present has approached the compacting limit of material, thus pole piece after roll-in through often occurring because The compacting of two end regions is excessive and cause pole piece both ends to kill, and lug fold is serious, the problems such as producing frequent broken belt, can only finally drop Low tapped density endures the loss of substantial amounts of pole piece, and compacted density uniformity is poor, battery with two side terminals is influenceed compared with Greatly.
The content of the invention
It is an object of the invention to provide a kind of electrodes of lithium-ion batteries, pole piece two easily occurs so as to solve existing pole piece Hold the problem of over-pressed.Lithium ion present invention simultaneously provides the preparation method of above-mentioned electrodes of lithium-ion batteries and using above-mentioned pole piece Battery.
To achieve the above object, the technical scheme of electrodes of lithium-ion batteries of the invention is：
A kind of electrodes of lithium-ion batteries, including collector and active material layer, in roll-in direction of advance, pole piece The surface density of two end portions is less than the surface density of center section.
The electrodes of lithium-ion batteries of the offer of the present invention, is set by the differentiation at pole piece both ends and center section surface density Meter, makes pole piece both ends and center section be compacted difference in roll-in and minimizes, lift the uniformity of compacted density, and pole piece is whole The limit is arrived in the compacted density lifting of body, and then improves battery energy density and uniformity, while avoids because pole piece both ends were compacted Fold caused by big, phenomena such as damaging by pressure.
Active material layer includes the constant interlude of thickness and the thickness thinning section positioned at interlude both ends, thickness on pole piece The surface density of thinning section is less than the surface density of interlude.Interlude is the intermediate region on pole piece obtained by matching convention film-making, should The thickness uniformity of active material layer on region.When pole piece makes, by reducing making for active material in thickness thinning section Dosage, and then the surface density of reduce thickness thinning section.
On the direction away from interlude, the thickness of active material layer is gradually reduced in thickness thinning section.Subtracted by thickness The uniform reduction of active material layer thickness on light filling bar, it is possible to achieve uniformly successively decreasing for surface density, surface density one is obtained after roll-in The more preferable pole piece of cause property.
The thickness of active material layer is d1 in thickness thinning section, and corresponding surface density is a1；Active material layer on interlude Thickness be d2, surface density a2；Afflux body thickness is d3, then a1, a2, d1, d2, d3 meet a2 ÷ (d2-d3)=a1 ÷ (d1-d3).Optimize the parameter setting of interlude and thickness thinning section under the design principle, can reach interlude and thickness is thinned The uniformity of section is optimal.
Preferably, surface density decreasing value μ=a2-a1≤50g/m2.Value Y=d2-d1≤30 μm are thinned in thickness.Thickness is thinned Section is X, 1mm≤X≤100mm along the length in roll-in direction of advance.Above parameter value is according to compacting size and roll Rigidity selected with distortion resistance, surface density, thickness are gradually reduced from centre to edge, until in pole piece edge, Surface density, thickness minimize.
The electrodes of lithium-ion batteries of the offer of the present invention, reduce the compacted density difference of pole piece diverse location, lifting electricity The uniformity in pond, the overall compacted density of pole piece is favorably improved, and then improves battery energy density；In addition, the lithium of the present invention Ion battery pole piece uniform force in roll-in is good, and the local deformation of roll can be avoided to wear, and improves the service life of roll.
The technical scheme of preparation method of the electrodes of lithium-ion batteries of the present invention is：
A kind of preparation method of electrodes of lithium-ion batteries, including：In roll-in direction of advance, among surface density Big mode small in ends coats active material layer, then through drying, roll-in, produces.
The surface density mode small in ends broad in the middle is the coating thickness by the way that the active material layer positioned at both ends is thinned Realize.Preferably, the thickness of the active material layer of weakened region is gradually reduced along away from the direction in the middle part of pole piece.
Being preferably provided with for thinned parameter is identical with the arrange parameter of above-mentioned electrodes of lithium-ion batteries, will not be described in detail herein.
The preparation method of the electrodes of lithium-ion batteries of the present invention, the difference of active material layer coating thickness during by making pole piece Alienation designs, and improves pole piece roll-in performance, reduces the compacted density difference of pole piece diverse location, lifts battery with two side terminals.
Electrodes of lithium-ion batteries prepared by the above method can be fabricated to positive plate and/or negative plate, after further assembling Lithium ion battery is made.
Using the lithium ion battery of above-mentioned electrodes of lithium-ion batteries, the compacted density difference of pole piece is small, and battery consistency is good, Battery energy density is favorably improved, while traditional flaking method fold, pressure caused by edge compacting is excessive can also be avoided Bad problem.
Brief description of the drawings
The coating thickness schematic diagram of active material layer when Fig. 1 is conventional film-making；
Fig. 2 is roll squeezer roll-in principle schematic；
Fig. 3 is roll squeezer roll stress diagram；
Fig. 4 is that roll squeezer roll-in and pole piece deform schematic diagram；
Fig. 5 is the top view of the electrodes of lithium-ion batteries of the present invention；
Fig. 6 is the active material layer coating thickness schematic diagram of the electrodes of lithium-ion batteries of the present invention.
Embodiment
Embodiments of the present invention are described further below in conjunction with the accompanying drawings.
The embodiment of the electrodes of lithium-ion batteries of the present invention, structural representation as shown in Figure 5 to Figure 6, including the He of collector 1 Active material layer 2 coated in the both sides of collector 1, in roll-in direction of advance, it is constant that active material layer includes thickness Interlude 5 and the thickness thinning section 4 positioned at the both ends of interlude 5, thickness thinning section 4 away from interlude 5 direction on activity The thickness of material layer is gradually reduced.
The length of interlude is 100mm in embodiment, and pole piece thickness corresponding to interlude is middle in 120 ± 3 μ ms Section design active material surface density is 370g/m2, afflux body thickness is 15 μm；The length X of two-end thickness thinning section is 50mm, Along away from interlude direction, the surface density of thickness thinning section is gradually reduced, and in edge, the thickness thinning Y of active material layer reaches To 30 μm, corresponding surface density reaches minimum value 340g/m2。
Comparative example
Comparative example prepares pole piece using conventional tabletting method, and pole piece specification is identical with embodiment, and the active material of pole piece applies Cover roll-in thickness in the 50mm of area both ends and be reduced to 112 μm by 118 μm, 100mm intermediate region interior pole thickness is at 120 ± 3 μm In the range of, design roll-in thickness is 120 μm, and design active material surface density is 370g/m2, afflux body thickness is 15 μm；In then Between region compacted density=design surface density/(120-15) g/cm of (roll-in thickness-afflux body thickness)=370/3=3.52g/ cm3, can similarly obtain edge maximum compacted density=370/ (112-15) g/cm3=3.81g/cm3。
The compacted density limit of material is 3.7g/cm3If intermediate region compacted density reaches 3.52g/cm3, edge Compacted density scope is 3.52-3.81g/cm in 50mm regions3, the limit is compacted beyond material, pole piece edge easily damages by pressure, pleat Wrinkle, broken belt.Produced to ensure, now can typically reduce compacted density, be compacted limit Design according to edge, reduce surface density.Pole Piece thickness is constant, and edge is compacted according to maximum 3.7g/cm3Calculate, surface density 358.9g/m2, now middle compacted density reduction To 3.42g/cm3, reduce amplitude 3%.From two end regions to intermediate region, compacted density scope is 3.42-3.70g/cm3, compacting The uniformity of density is poor.
The electrodes of lithium-ion batteries of embodiment, is thinned using thickness that to realize that both ends surface density is less than median surface close during making Spend, surface density is gradually reduced in thickness thinning section, and edge thinnest part surface density is 340g/cm3.The battery pole piece in roll-in by Roll stiffness constrains thickness change very little, and edge is compacted=340/ (112-15) g/cm3=3.51g/cm3, centre compacting=370/ (120-15)g/cm3=3.52g/cm3.Improve back edge compacting with middle compacting very different to reduce, fringe region is not also up to pressure The real density limit, the improvement of fringe region roll-in quality is larger, so without reduce compacted density again.If according to material most Big compacted density 3.7g/cm3To design, this model battery anode slice compacted density lifting amplitude=(3.7-3.42)/3.52* 100%=8%, positive effect is lifted to battery energy density, while the extreme difference of pole piece different zones compacted density reduces, pole piece Uniformity lifting is larger.
The electrodes of lithium-ion batteries of above-described embodiment is when making, according to compacting size and the rigidity and distortion resistance of roll Determine that scope is thinned in thickness, the corresponding coating thickness that the active material layer positioned at both ends is thinned in coating, through drying, roll-in, Edge is cut perpendicular to roll-in direction of advance, you can prepares the electrodes of lithium-ion batteries.
In the other embodiment of above-mentioned electrodes of lithium-ion batteries, electrodes of lithium-ion batteries can be negative plate；Thickness subtracts Light filling bar can use step design, and length range, the active material thickness of thickness thinning section reduce degree, surface density reduction degree It can be adjusted as needed.
The battery pole piece of embodiment and the pole piece of comparative example are assembled into lithium ion battery by identical assembly technology, implemented The battery energy density of example gained lithium ion battery significantly improves, and the uniformity of lithium ion battery substantially improves.

Claims (10)

1. a kind of electrodes of lithium-ion batteries, including collector and active material layer, it is characterised in that perpendicular to roll-in advance side Upwards, the surface density of pole piece two end portions is less than the surface density of center section.
2. electrodes of lithium-ion batteries as claimed in claim 1, it is characterised in that active material layer includes the constant centre of thickness Section and the thickness thinning section positioned at interlude both ends, the surface density of thickness thinning section is less than the surface density of interlude on pole piece.
3. electrodes of lithium-ion batteries as claimed in claim 2, it is characterised in that on the direction away from interlude, thickness subtracts The thickness of active material layer is gradually reduced on light filling bar.
4. electrodes of lithium-ion batteries as claimed in claim 3, it is characterised in that the thickness of active material layer in thickness thinning section For d1, corresponding surface density is a1；The thickness of active material layer is d2, surface density a2 on interlude；Afflux body thickness is d3, Then a1, a2, d1, d2, d3 meet a2 ÷ (d2-d3)=a1 ÷ (d1-d3).
5. electrodes of lithium-ion batteries as claimed in claim 4, it is characterised in that surface density decreasing value μ=a2-a1≤50g/m2。
6. electrodes of lithium-ion batteries as claimed in claim 4, it is characterised in that value Y=d2-d1≤30 μm are thinned in thickness.
7. electrodes of lithium-ion batteries as claimed in claim 2 or claim 3, it is characterised in that thickness thinning section is along before roll-in The length entered on direction is X, 1mm≤X≤100mm.
A kind of 8. preparation method of electrodes of lithium-ion batteries as claimed in claim 1, it is characterised in that including：Perpendicular to In roll-in direction of advance, active material layer is coated by surface density mode small in ends broad in the middle, then through drying, roll-in, produce.
9. the preparation method of electrodes of lithium-ion batteries as claimed in claim 8, it is characterised in that the surface density broad in the middle two Holding small mode is realized by the way that the coating thickness of the active material layer positioned at both ends is thinned.
A kind of 10. lithium ion battery using electrodes of lithium-ion batteries as claimed in claim 1.
CN201710936494.8A 2017-10-10 2017-10-10 A kind of electrodes of lithium-ion batteries and preparation method thereof, lithium ion battery Pending CN107732146A (en)

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CN108461801A (en) * 2018-03-29 2018-08-28 努比亚技术有限公司 Chain type battery and electronic device
CN108565387A (en) * 2018-03-21 2018-09-21 中航锂电技术研究院有限公司 A kind of lithium ion battery cell lug laser formation technique
CN110899336A (en) * 2019-11-29 2020-03-24 四川新敏雅电池科技有限公司 Rolling mechanism and roller design method
CN110943222A (en) * 2019-04-15 2020-03-31 宁德时代新能源科技股份有限公司 Electrode plate and electrochemical device
CN110943200A (en) * 2019-04-15 2020-03-31 宁德时代新能源科技股份有限公司 Electrode plate and electrochemical device
CN110943201A (en) * 2019-04-15 2020-03-31 宁德时代新能源科技股份有限公司 Positive pole piece and electrochemical device
WO2020077740A1 (en) * 2018-10-17 2020-04-23 宁德时代新能源科技股份有限公司 Secondary battery and electrode member thereof
CN111162281A (en) * 2019-12-23 2020-05-15 天能电池集团股份有限公司 Cylindrical lead storage battery
CN111180738A (en) * 2019-06-28 2020-05-19 宁德时代新能源科技股份有限公司 Electrode plate and electrochemical device
CN111180665A (en) * 2019-06-28 2020-05-19 宁德时代新能源科技股份有限公司 Electrode plate and electrochemical device
CN111816838A (en) * 2020-07-22 2020-10-23 珠海冠宇电池股份有限公司 Lithium ion battery positive plate and preparation method thereof and lithium ion battery
CN112186128A (en) * 2019-07-01 2021-01-05 宁德时代新能源科技股份有限公司 Positive pole piece and electrochemical device
CN112186195A (en) * 2019-07-01 2021-01-05 宁德时代新能源科技股份有限公司 Positive pole piece and electrochemical device
CN114300652A (en) * 2022-01-06 2022-04-08 中化国际(控股)股份有限公司 Electrode pole piece, preparation method and application thereof
WO2022165850A1 (en) * 2021-02-08 2022-08-11 宁德新能源科技有限公司 Battery
CN116053605A (en) * 2022-11-21 2023-05-02 江苏正力新能电池技术有限公司 Battery cell, battery cell preparation method and lithium battery
WO2023123411A1 (en) * 2021-12-31 2023-07-06 宁德时代新能源科技股份有限公司 Negative electrode plate, preparation method therefor, secondary battery comprising negative electrode plate, and electric device

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CN108461801A (en) * 2018-03-29 2018-08-28 努比亚技术有限公司 Chain type battery and electronic device
WO2020077740A1 (en) * 2018-10-17 2020-04-23 宁德时代新能源科技股份有限公司 Secondary battery and electrode member thereof
US11043677B2 (en) 2018-10-17 2021-06-22 Contemporary Amperex Technology Co., Limited Secondary battery and electrode member thereof having an electricity generation region with reduced curvature
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CN110943222A (en) * 2019-04-15 2020-03-31 宁德时代新能源科技股份有限公司 Electrode plate and electrochemical device
CN110943201A (en) * 2019-04-15 2020-03-31 宁德时代新能源科技股份有限公司 Positive pole piece and electrochemical device
CN110943200A (en) * 2019-04-15 2020-03-31 宁德时代新能源科技股份有限公司 Electrode plate and electrochemical device
CN110943222B (en) * 2019-04-15 2021-01-12 宁德时代新能源科技股份有限公司 Electrode plate and electrochemical device
CN111180738A (en) * 2019-06-28 2020-05-19 宁德时代新能源科技股份有限公司 Electrode plate and electrochemical device
CN111180665A (en) * 2019-06-28 2020-05-19 宁德时代新能源科技股份有限公司 Electrode plate and electrochemical device
CN111180738B (en) * 2019-06-28 2021-07-30 宁德时代新能源科技股份有限公司 Electrode plate and electrochemical device
US11611064B2 (en) 2019-06-28 2023-03-21 Contemporary Amperex Technology Co., Limited Electrode plate having relatively thin conductive layer, electrochemical apparatus, and apparatus thereof
CN112186195A (en) * 2019-07-01 2021-01-05 宁德时代新能源科技股份有限公司 Positive pole piece and electrochemical device
CN112186128A (en) * 2019-07-01 2021-01-05 宁德时代新能源科技股份有限公司 Positive pole piece and electrochemical device
CN112186128B (en) * 2019-07-01 2021-10-01 宁德时代新能源科技股份有限公司 Positive pole piece and electrochemical device
US11804604B2 (en) * 2019-07-01 2023-10-31 Contemporary Amperex Technology Co., Limited Positive electrode piece in a battery, electrochemical device and apparatus
CN112186195B (en) * 2019-07-01 2023-11-03 宁德时代新能源科技股份有限公司 Positive electrode plate and electrochemical device
CN110899336A (en) * 2019-11-29 2020-03-24 四川新敏雅电池科技有限公司 Rolling mechanism and roller design method
CN111162281A (en) * 2019-12-23 2020-05-15 天能电池集团股份有限公司 Cylindrical lead storage battery
CN111816838A (en) * 2020-07-22 2020-10-23 珠海冠宇电池股份有限公司 Lithium ion battery positive plate and preparation method thereof and lithium ion battery
WO2022165850A1 (en) * 2021-02-08 2022-08-11 宁德新能源科技有限公司 Battery
WO2023123411A1 (en) * 2021-12-31 2023-07-06 宁德时代新能源科技股份有限公司 Negative electrode plate, preparation method therefor, secondary battery comprising negative electrode plate, and electric device
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CN116053605A (en) * 2022-11-21 2023-05-02 江苏正力新能电池技术有限公司 Battery cell, battery cell preparation method and lithium battery
CN116053605B (en) * 2022-11-21 2024-03-12 江苏正力新能电池技术有限公司 Battery cell, battery cell preparation method and lithium battery

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