CN103367702A - Lithium ion battery pole piece and lithium ion battery comprising pole piece - Google Patents
Lithium ion battery pole piece and lithium ion battery comprising pole piece Download PDFInfo
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- CN103367702A CN103367702A CN2013103022328A CN201310302232A CN103367702A CN 103367702 A CN103367702 A CN 103367702A CN 2013103022328 A CN2013103022328 A CN 2013103022328A CN 201310302232 A CN201310302232 A CN 201310302232A CN 103367702 A CN103367702 A CN 103367702A
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- pole piece
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- lug boss
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention belongs to the technical field of lithium ion battery, and especially relates to a lithium ion battery pole piece. The pole piece comprises a current collector and an active substance layer arranged on the surface of the current collector. A plurality of protrusions and recesses are arranged on the active substance layer. Compared with prior art, According to the invention, the protrusions and recesses are arranged on the active substance layer, such that a pole piece with a unique convex-concave structure is formed. During the battery application process, when anode pole piece volume expansion occurs, the shape of a corresponding cathode pole piece is basically maintained, such that anode pole piece expansion can be limited and induced, such that anode pole piece expansion degree and irregularity can be reduced. Therefore, battery appearance deformation and subsequent battery performance deterioration caused by anode expansion can be effectively inhibited. Therefore, the pole piece has an important significance upon lithium ion battery quality and service life. Also, the invention discloses a lithium ion battery comprising the pole piece.
Description
Technical field
The invention belongs to technical field of lithium ion, relate in particular to a kind of electrodes of lithium-ion batteries and comprise the lithium ion battery of this pole piece.
Background technology
Lithium ion battery discharges and recharges the anode expansion that causes and runs up to a certain degree and can produce the battery core appearance deformation afterwards, in the inner space that forms of naked battery core, cause electrolyte content not enough, thereby the linksystem that brings out the chemical property of battery worsen, and shortens the useful life of lithium ion battery.
In order to suppress anode expansion, can adopt the stronger binding agent of cohesive force with the volumetric expansion of constraint graphite granule behind the embedding lithium; Perhaps have the coating of bonding effect by the surface-coated at pole piece or barrier film, anode pole piece and barrier film are bonded together securely, to strengthen the ability of its resistance to deformation.In addition, also have by adopting high-intensity outer rigid housing to limit the method for anode expansion.
Although said method can be alleviated the adverse effect that anode expansion causes to a certain extent, its focus is anode pole piece, does not consider for another important component part cathode sheet of lithium ion battery coiling structure; In addition, use the high-adhesion bonding agent easily to cause pole piece to become fragile, be unfavorable for follow-up winding process; Increasing the coating with bonding effect on the barrier film surface then causes cost to increase.
The section structure schematic diagram of pole piece of the prior art (comprising cathode sheet and anode pole piece) as shown in Figure 1, the active material layer 20 that it comprises collector 10 and is coated in collector 10 surfaces, wherein, the surface of active material layer 20 is smooth smooth, when cathode sheet, barrier film and anode pole piece are wound into naked battery core and are assembled into battery, anode pole piece expands easily, and the cathode sheet relative with it can't limit it, and finally causes the expansion of whole naked battery core.
In view of this, the necessary lithium ion battery that a kind of electrodes of lithium-ion batteries is provided and comprises this pole piece, this pole piece is based on the characteristics of winding-structure of the naked battery core of lithium ion battery and the pole piece with jut and depressed part that designs, it is deteriorated that the pole piece of this structure can suppress battery core distortion and chemical property that anode expansion causes, improves the cycle life of battery.
Summary of the invention
One of purpose of the present invention is: for the deficiencies in the prior art, and provide a kind of electrodes of lithium-ion batteries, this pole piece is based on the characteristics of winding-structure of the naked battery core of lithium ion battery and the pole piece with jut and depressed part that designs, it is deteriorated that the pole piece of this structure can suppress battery core distortion and chemical property that anode expansion causes, improves the cycle life of battery.
In order to achieve the above object, the present invention adopts following technical scheme: a kind of electrodes of lithium-ion batteries, described pole piece comprise collector and are arranged on the active material layer of described collection liquid surface, be provided with several lug bosses and depressed part on the described active material layer.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, described lug boss and described depressed part compartment of terrain are distributed in described active material layer.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, described lug boss and described depressed part are spaced apart along the Width of described active material layer.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, the distance between adjacent two described lug bosses equates with distance between adjacent two described depressed parts.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, the height of described lug boss and the degree of depth of described depressed part be described active material layer thickness 1/20 ~ 1/50.Too little then being not easy of the height of lug boss and the degree of depth of depressed part (or being referred to as relief intensity) forms comparatively closely " interlocking " structure between cathode sheet and anode pole piece, can't realize the effect of the stress that the anode pole piece expansion produces; Relief intensity then forms the excessive zone of compacted density too greatly easily, causes the compacted density difference of pole piece superficial layer excessive, produces anode easily when large electric current charging and low temperature charging and analyses the lithium problem, affects the security performance of battery.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, the height of described lug boss and the degree of depth of described depressed part be described active material layer thickness 1/20 ~ 1/30, this is preferred scope.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, the length of described lug boss and the length of described depressed part be described active material layer width 1/5 ~ 1/15.The length of lug boss and depressed part is too little, the control of operation when then being unfavorable for reeling, and the length of lug boss and depressed part is oversize then to be unfavorable for forming close-fitting " interlocking " structure.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, the length of described lug boss and the length of described depressed part be described active material layer width 1/10, this is preferred scope.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, the shape of the cross section of described lug boss and described depressed part is circle, ellipse, rectangle or rhombus.
With respect to prior art, the present invention is based on the winding-structure characteristics of the naked battery core of lithium ion battery, by the active material layer at pole piece lug boss and depressed part are set, thereby form a kind of pole piece with " relief fabric " (comprising cathode sheet and anode pole piece) of uniqueness, when this cathode sheet and anode pole piece and barrier film were wound into naked battery core, cathode sheet and anode pole piece can form " interlocking " structure.After should naked battery core being assembled into battery, in the use procedure of battery, when anode pole piece generation volumetric expansion, because the cathode sheet relative with it keeps original shape invariance substantially, thereby can limit the expansion with the inductive anode pole piece, thereby reduce degree and the irregularities of anode expansion.On structure, the macroscopic view of whole piece anode pole piece expands and resolves into some small expansion area with being broken the whole up into parts in the lithium ion battery, each small expansion area is subject to the restriction of " relief fabric " of the cathode sheet of arest neighbors, so that it can't form larger cumulative function from macroscopic view.Therefore, pole piece of the present invention can establishment because the problem that the battery appearance deformation that anode expansion causes and follow-up battery performance worsen, for having great importance in quality and the useful life of improving lithium ion battery.
Pole piece of the present invention can be applicable to flexible packing lithium ion battery, hard packaging lithium ionic cell and cylindrical lithium ion battery.And pole piece of the present invention has important value for the commercial applications of the comparatively serious alloy anode that expands.
Another object of the present invention is to provide a kind of lithium ion battery, comprise cathode sheet, anode pole piece, be arranged at barrier film and electrolyte between described cathode sheet and the described anode pole piece, described cathode sheet and described anode pole piece are electrodes of lithium-ion batteries of the present invention, and the depressed part of described cathode sheet and the lug boss of described anode pole piece are oppositely arranged, and the lug boss of described cathode sheet and the depressed part of described anode pole piece are oppositely arranged.
With respect to prior art, cathode sheet and being used of anode pole piece of the present invention by all having " relief fabric ", " relief fabric " that take full advantage of the cathode sheet surface keeps the substantially constant characteristics of original shape in electrochemical process, to the embedding lithium of the anode pole piece that has equally surface " relief fabric " expand produce pin down, adjustment and induction.On structure, the macroscopic view of whole piece anode pole piece expands and resolves into some small expansion area with being broken the whole up into parts in the lithium ion battery, each small expansion area is subject to the restriction of relief fabric of the cathode sheet of arest neighbors, so that it can't form larger cumulative function from macroscopic view.Therefore, the surperficial interlocking structure that the present invention proposes can establishment because the problem that the battery appearance deformation that anode expansion causes and follow-up battery performance worsen, for having great importance in quality and the useful life of improving lithium ion battery.
In addition, on cathode sheet of the present invention and the anode pole piece lug boss and depressed part be arranged so that formed the narrower secondary channel of a plurality of width on the pole piece, in the injecting electrolytic solution process, the contact area of electrolyte and pole piece increases, be conducive to electrolyte and fill up rapidly space between anode pole piece, cathode sheet and the barrier film by capillarity, thereby can shorten the time of repose after the fluid injection, improve fluid injection efficient and the effect of impregnation may of naked battery core in electrolyte, be conducive to form even, consistent SEI film, improve the consistency of battery core capacity.
Description of drawings
Fig. 1 is the section structure schematic diagram of electrodes of lithium-ion batteries of the prior art.
10-collector wherein, the 20-active material layer.
Fig. 2 is the section structure schematic diagram of electrodes of lithium-ion batteries provided by the invention.
Fig. 3 is the section structure schematic diagram of the battery core that is wound into of cathode sheet among the present invention and anode pole piece and barrier film.
Wherein, 1-collector, 2-active material layer, 21-lug boss, 22-depressed part, 30-cathode sheet, 40-anode pole piece, 50-barrier film.
The battery that Fig. 4 provides for embodiment 6 and Comparative Examples 2 completely fill with the loop test process in varied in thickness trend.
Fig. 5 increases percentage for the thickness of battery in the loop test process that embodiment 6 and Comparative Examples 2 provide, completely to fill thickness as benchmark.
Embodiment
In order to make purpose of the present invention, technical scheme and useful technique effect more clear, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.Should be understood that the embodiment described in this specification only is in order to explain the present invention, is not in order to limit the present invention.
The invention provides a kind of electrodes of lithium-ion batteries.
Embodiment 1, and as shown in Figure 2, a kind of electrodes of lithium-ion batteries that present embodiment provides, this pole piece comprise collector 1 and are arranged on the active material layer 2 on collector 1 surface, be provided with several lug bosses 21 and depressed part 22 on the active material layer 2.This lug boss 21 and depressed part 22 compartment of terrains are distributed on the Width of active material layer 2, and the distance between two adjacent lug bosses 21 equates with distance between two adjacent depressed parts 22, the degree of depth of the height of lug boss 21 and depressed part 22 be active material layer 2 thickness 1/30, the length of the length of lug boss 21 and depressed part 22 be active material layer 2 width 1/10, the shape of the cross section of lug boss 21 and depressed part 22 is circle.
Embodiment 2, as different from Example 1: the degree of depth of the height of lug boss 21 and depressed part 22 be active material layer 2 thickness 1/40, the length of the length of lug boss 21 and depressed part 22 be active material layer 2 width 1/7, the shape of the cross section of lug boss 21 and depressed part 22 is ellipse.
All the other repeat no more here with embodiment 1.
Embodiment 3, as different from Example 1: the degree of depth of the height of lug boss 21 and depressed part 22 be active material layer 2 thickness 1/50, the length of the length of lug boss 21 and depressed part 22 be active material layer 2 width 1/15, the shape of the cross section of lug boss 21 and depressed part 22 is rectangle.
All the other repeat no more here with embodiment 1.
Embodiment 4, as different from Example 1: the degree of depth of the height of lug boss 21 and depressed part 22 be active material layer 2 thickness 1/20, the length of the length of lug boss 21 and depressed part 22 be active material layer 2 width 1/5, the shape of the cross section of lug boss 21 and depressed part 22 is rhombus.
All the other repeat no more here with embodiment 1.
Embodiment 5, as different from Example 1: the degree of depth of the height of lug boss 21 and depressed part 22 be active material layer 2 thickness 1/25, the length of the length of lug boss 21 and depressed part 22 be active material layer 2 width 1/12, the shape of the cross section of lug boss 21 and depressed part 22 is circle.
All the other repeat no more here with embodiment 1.
What the pole piece of lithium ion battery of the present invention adopted is conventional production and manufacture method, difference is compaction technology: adopt the surface to have the milling roller of lug boss and depressed part, dried pole piece is rolled processing, so that have corresponding lug boss 21 and depressed part 22 through the pole piece surface of rolling.The length of lug boss 21 and depressed part 22 determines by the length of milling roller depression in the surface section and lug boss respectively, the degree of depth of the height of lug boss 21 and depressed part 22 respectively by year roller surface the degree of depth of depressed part and the height of lug boss determine.
The section structure schematic diagram of the pole piece of the lithium ion battery that Comparative Examples 1, this Comparative Examples provide as shown in Figure 1, the active material layer 20 that it comprises collector 10 and is coated in collector 10 surfaces, wherein, the surface of active material layer 20 is smooth smooth.
The present invention also provides a kind of lithium ion battery.
Embodiment 6, the lithium ion battery that present embodiment provides comprises cathode sheet 30, anode pole piece 40, is arranged at barrier film 50 and electrolyte between cathode sheet 30 and the anode pole piece 40, wherein, cathode sheet 30 and anode pole piece 40 are the electrodes of lithium-ion batteries that embodiment 1 provides, and the depressed part 22 of cathode sheet 30 is oppositely arranged with the lug boss 21 of anode pole piece 40, and the lug boss 21 of cathode sheet 30 is oppositely arranged with the depressed part 22 of anode pole piece 40.The section structure schematic diagram of the battery core that cathode sheet 30 and anode pole piece 40 and barrier film 50 are wound into as shown in Figure 3, because the structural parameters of cathode sheet 30 and anode pole piece 40 mate mutually, therefore, in the battery core that adopts this cathode sheet 30 and anode pole piece 40 and barrier film 50 to reel and form, cathode sheet 30 and anode pole piece 40 closely are fitted in the both sides of barrier film 50.
Embodiment 7, and as different from Example 6: cathode sheet 30 and the anode pole piece 40 of the lithium ion battery that present embodiment provides are the electrodes of lithium-ion batteries that embodiment 2 provides.
All the other repeat no more here with embodiment 6.
Embodiment 8, and as different from Example 6: cathode sheet 30 and the anode pole piece 40 of the lithium ion battery that present embodiment provides are the electrodes of lithium-ion batteries that embodiment 3 provides.
All the other repeat no more here with embodiment 6.
Embodiment 9, and as different from Example 6: cathode sheet 30 and the anode pole piece 40 of the lithium ion battery that present embodiment provides are the electrodes of lithium-ion batteries that embodiment 4 provides.
All the other repeat no more here with embodiment 6.
All the other repeat no more here with embodiment 6.
Wherein, the said lithium ion battery of the present invention both can be flexible packing lithium ion battery, can be again hard packaging lithium ionic cell and cylindrical lithium ion battery.Anode active material in the anode pole piece 40 both can be graphite, also can be silicon alloy, ashbury metal etc., or the mixture of graphite and silicon alloy, ashbury metal etc.
Comparative Examples 2, as different from Example 6: the cathode sheet of the lithium ion battery that present embodiment provides and anode pole piece are the electrodes of lithium-ion batteries that Comparative Examples 1 provides.
All the other repeat no more here with embodiment 6.
The battery that embodiment 6-10 and Comparative Examples 2 are provided at low temperatures (12
oC) completely fill after, in drying shed, disassemble, found that: the anode pole piece in the lithium degree of analysing of the anode pole piece 40 in the battery of embodiment 6-10 and the battery that Comparative Examples 2 provides to analyse the lithium degree very approaching, especially the depressed part 22 of the anode pole piece in the battery of embodiment 6-10 40, it is the relatively large part of compacted density, it is analysed the lithium degree and is not become serious, and this security performance that shows lithium ion battery provided by the invention is not affected because of the change of pole piece structure.
The battery that embodiment 6-10 and Comparative Examples 2 are provided carries out the electrochemistry capacitance test, and the result shows that the capacity of the battery of the capacity of battery of embodiment and Comparative Examples does not have notable difference.This volumetric properties that shows lithium ion battery provided by the invention is not affected because of the change of pole piece structure.
The battery that embodiment 6 and Comparative Examples 2 are provided carries out the electrochemistry capacitance loop test, and behind per 100 loop tests, measure the thickness of battery core, the result as shown in Figure 4, calculating simultaneously the thickness of battery in the capacity circulating test process increases percentage (cell thickness when completely filling is as benchmark), and acquired results as shown in Figure 5.Can be found out by Figure 4 and 5: under the condition of the coating weight that does not change cathode sheet 30 and anode pole piece 40, the original depth of the battery that embodiment 6 provides is larger than the battery that Comparative Examples 2 provides; But through behind 200 loop tests, the battery that the thickness of the battery that embodiment 6 provides provides less than Comparative Examples 2, and this trend is along with the loop test number of times further increases obvious all the more: the thickness of the battery that embodiment 6 provides does not obviously increase behind 600 loop tests, and along with the increase of loop test number of times, the thickness increase of the battery that embodiment 6 provides tends towards stability.After the test of 600 capacity circulatings, the thickness increase of the battery of embodiment 6 only has about 5%, provides about 30% thickness of battery to increase far below Comparative Examples 2.This result shows: lithium ion battery provided by the invention is having a significant effect aspect the inhibition anode expansion, and it can suppress the adverse effect that anode expansion produces, for preventing that the battery core distortion has important effect.
Need to prove: be distributed in example on the active material layer 2 although only provided lug boss 21 and depressed part 22 compartment of terrains in the embodiments of the invention, lug boss 21 and depressed part 22 can also be distributed on the active material layer 2 with the distribution form of lug boss 21-lug boss 21-depressed part 22-depressed part 22-lug boss 21 and so on; Although only provided the example on the Width that lug boss 21 and depressed part 22 compartment of terrains are distributed in active material layer 2 in the embodiments of the invention, lug boss 21 and depressed part 22 can also be distributed on the length direction of active material layer 2 compartment of terrain; Although only provided the equidistant example between the adjacent depressed part 22 of distance between two adjacent lug bosses 21 and two in the embodiments of the invention, the distance between the adjacent depressed part 22 of the distance between two adjacent lug bosses 21 and two also can be unequal.As long as guarantee when cathode sheet 30, barrier film 50 and anode pole piece 40 are wound into battery core, lug boss 21 on the cathode sheet 30 over against be depressed part on the anode pole piece 40, the depressed part 22 on the cathode sheet 30 over against be that lug boss 30 on the anode pole piece 40 gets final product.
Also need to prove: pole piece structure provided by the invention can be widely used in the design and production of lithium ion battery electrode piece, but be not limited to the design and production of lithium ion battery electrode piece, for knowing those skilled in the art, the present invention is equally applicable to need to be to other association area of control expansion and the mis-behave that causes owing to expanding.
The according to the above description description of book and indication, those skilled in the art in the invention can also carry out suitable change and modification to above-mentioned execution mode.Therefore, the embodiment of describing and indicating above the present invention is not limited to also should be included in the protection range of claim of the present invention modifications and changes more of the present invention.In addition, although used some specific terms in this specification, these terms do not consist of any restriction to the present invention just for convenience of description.
Claims (10)
1. electrodes of lithium-ion batteries, described pole piece comprise collector and are arranged on the active material layer of described collection liquid surface, it is characterized in that: be provided with several lug bosses and depressed part on the described active material layer.
2. electrodes of lithium-ion batteries according to claim 1, it is characterized in that: described lug boss and described depressed part compartment of terrain are distributed in described active material layer.
3. electrodes of lithium-ion batteries according to claim 2, it is characterized in that: described lug boss and described depressed part are spaced apart along the Width of described active material layer.
4. electrodes of lithium-ion batteries according to claim 3 is characterized in that: the distance between adjacent two described lug bosses equates with distance between adjacent two described depressed parts.
5. electrodes of lithium-ion batteries according to claim 4 is characterized in that: the height of described lug boss and the degree of depth of described depressed part be described active material layer thickness 1/20 ~ 1/50.
6. electrodes of lithium-ion batteries according to claim 5 is characterized in that: the height of described lug boss and the degree of depth of described depressed part be described active material layer thickness 1/20 ~ 1/30.
7. electrodes of lithium-ion batteries according to claim 3 is characterized in that: the length of described lug boss and the length of described depressed part be described active material layer width 1/5 ~ 1/15.
8. electrodes of lithium-ion batteries according to claim 7 is characterized in that: the length of described lug boss and the length of described depressed part be described active material layer width 1/10.
9. electrodes of lithium-ion batteries according to claim 1, it is characterized in that: the shape of the cross section of described lug boss and described depressed part is circle, ellipse, rectangle or rhombus.
10. lithium ion battery, comprise cathode sheet, anode pole piece, be arranged at barrier film and electrolyte between described cathode sheet and the described anode pole piece, it is characterized in that: described cathode sheet and described anode pole piece are the described electrodes of lithium-ion batteries of claim 1 to 9 any one, and the depressed part of described cathode sheet and the lug boss of described anode pole piece are oppositely arranged, and the lug boss of described cathode sheet and the depressed part of described anode pole piece are oppositely arranged.
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| CN201310302232.8A CN103367702B (en) | 2013-07-18 | 2013-07-18 | Lithium ion battery pole piece and lithium ion battery comprising pole piece |
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| CN201310302232.8A CN103367702B (en) | 2013-07-18 | 2013-07-18 | Lithium ion battery pole piece and lithium ion battery comprising pole piece |
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| CN106654286A (en) * | 2016-11-18 | 2017-05-10 | 浙江大学 | Flexible electrode and preparation method thereof |
| CN107403904A (en) * | 2016-05-18 | 2017-11-28 | 宁德时代新能源科技股份有限公司 | Lithium ion battery and negative plate thereof |
| CN108352501A (en) * | 2016-07-15 | 2018-07-31 | 株式会社Lg化学 | Cathode and secondary cell comprising it |
| CN111916627A (en) * | 2020-07-14 | 2020-11-10 | 东莞塔菲尔新能源科技有限公司 | Lithium ion battery and diaphragm thereof |
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| JP4038233B2 (en) * | 2006-02-14 | 2008-01-23 | 松下電器産業株式会社 | Non-aqueous electrolyte secondary battery electrode, method for producing the same, and non-aqueous electrolyte secondary battery equipped with non-aqueous electrolyte secondary battery electrode |
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| CN203398216U (en) * | 2013-07-18 | 2014-01-15 | 东莞新能源科技有限公司 | Lithium ion battery pole pieces and lithium ion battery comprising same |
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| CN111916627A (en) * | 2020-07-14 | 2020-11-10 | 东莞塔菲尔新能源科技有限公司 | Lithium ion battery and diaphragm thereof |
| CN113285052A (en) * | 2021-05-06 | 2021-08-20 | 路华置富电子(深圳)有限公司 | Positive plate, manufacturing method thereof and battery |
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