CN103367701B - Lithium ion battery positive electrode sheet and battery comprising positive electrode sheet - Google Patents
Lithium ion battery positive electrode sheet and battery comprising positive electrode sheet Download PDFInfo
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- CN103367701B CN103367701B CN201310302191.2A CN201310302191A CN103367701B CN 103367701 B CN103367701 B CN 103367701B CN 201310302191 A CN201310302191 A CN 201310302191A CN 103367701 B CN103367701 B CN 103367701B
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- pole piece
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention belongs to the technical field of lithium ion battery, and especially relates to a positive electrode sheet of a lithium ion battery. The positive electrode sheet is provided with a crack structure, wherein the opening of the crack structure is provided on the surface layer of the electrode sheet. With the crack structure, absorption rate of the electrode sheet upon electrolyte can be greatly improved, and standing time after liquid injection of the lithium ion battery can be reduced. In a lithium ion battery with the crack structure, with the existence of the crack, a highway is provided for rapid transmission of the electrolyte in the electrode sheet, and battery charge/discharge rate capability is greatly improved. Also, the invention discloses a lithium ion battery.
Description
Technical field
The invention belongs to technical field of lithium ion, more particularly to a kind of lithium ion battery anode pole piece and comprising this
The battery of pole piece.
Background technology
Since the extensive commercialization of lithium ion battery, by its high-energy-density, the advantage of high power density, portable
It is widely used in electrical equipment such as laptop computer, video camera, mobile communication.Although the market demand is increasing, for lithium
For ion battery manufacturer, the competition for facing is also more and more fierce.On the one hand the fierce of competition be embodied in lithium ion battery
Performance odds to upper, be on the other hand embodied on the height of battery manufacture cost.
In order to improve the competitiveness of product, lithium ion battery manufacturers all be devoted to always battery performance lifted and
Battery manufacture cost is reduced.In numerous Technology efforts, most technologies all can only achieve the requirement of one side, or
Battery performance can only be improved, or battery cost can only be reduced.So, those can simultaneously improve battery performance and reduce battery system
This Technology effort and innovation is caused, has very big attraction for lithium ion battery manufacturer is undoubtedly.
The content of the invention
An object of the present invention is：For the deficiencies in the prior art, and provide a kind of positive pole pole of lithium ion battery
Piece, the anode pole piece has very fast infiltration rate for electrolyte, and the quiescent time after battery core fluid injection can be greatly reduced, so as to
The manufacturing time cost of battery is reduced, and for battery charging and discharging high rate performance all can be obviously improved.
In order to achieve the above object, the present invention provides a kind of anode pole piece of lithium ion battery, and the technical scheme is as follows：One
The anode pole piece of lithium ion battery is planted, anode pole piece is provided with crack structtire, and the opening of the crack structtire is arranged at pole piece
Top layer.The preparation of crack structtire can be by preparing in pole coating dry run, or being dried by pole piece
Cross afterwards during bending and prepare, crackle can be straight or curved, and crack orientation can be along pole piece width or edge
Pole piece length direction, or along pole piece width and the both direction of length direction, crack orientation is preferably along battery core
Width, and extend through battery core widthwise edges.Crackle can run through whole pole piece thickness from pole piece, it is also possible to only run through
Pole piece segment thickness；The latter is compared, the former improvement to electrolyte infiltration rate and the improvement of battery high rate performance are more notable.
It is under normal circumstances not have crackle knot in battery pole piece for commercial Li-ion battery conventional at present
Structure.In cold pressing process, many holes of pole piece can be blocked this battery pole piece without crack structtire, because pole
There is a roller compaction process in piece cold pressing process.Pole piece after to colding pressing carries out the infiltration rate test of electrolyte, will hold very much
Easily find that the infiltration rate of electrode solution is very slow, because many holes on surface are blocked.Crackle in the present invention is deposited
High-speed channel is provided inside for electrolyte permeability to pole piece, and these crackles are difficult in cold pressure procedure to be blocked up completely
Plug, it is possible to greatly improve the infiltration rate of electrolyte, reduces the quiescent time after battery core fluid injection.
Active material in the anode pole piece is at least one in cobalt acid lithium, nickel cobalt manganese, LiFePO4 and LiMn2O4.
The width of the crackle in the crack structtire is 1 ~ 20um, and the width of crackle should at least in more than 1um otherwise will
Because capillarity, it is difficult to play the improvement to electrolyte infiltration rate；But crack width also should not be too big, otherwise will be to electricity
The impedance in pond, the structural stability of pole piece, the energy density of battery produce large effect.
Preferably, the width of the crackle in the crack structtire is 1 ~ 5um.
The length of the crackle in the crack structtire is at least 5um, and the length of crackle should not be too little, is otherwise easily colding pressing
During be blocked.
The surface density of the crackle in the crack structtire is 10 ~ 10000m/m2, the surface density of crackle should not be too little, otherwise
The high rate performance improvement of absorbent and battery to pole piece is not obvious；Surface density also should not be too big, otherwise can be to battery
Impedance, the structural stability of pole piece, the energy density of battery produce large effect.
Preferably, the surface density of the crackle in the crack structtire is 100 ~ 1000m/m2。
The cross sectional shape of the crackle in the crack structtire is at least one in triangle, trapezoidal and rectangle.
Another object of the present invention is to provide a kind of lithium ion battery, including anode pole piece, cathode pole piece, is arranged at institute
The barrier film and electrolyte between anode pole piece and the cathode pole piece is stated, the lithium ion battery is using above-mentioned with crackle knot
The anode pole piece of structure is used as electrodes of lithium-ion batteries.
For the battery that the new construction pole piece announced by the present invention is assembled into, the presence of crackle can improve filling for battery
Discharge-rate performance.Same reason, without the battery pole piece that crackle is present, due to the partial hole on pole piece top layer in cold pressure procedure
Hole is blocked, and in charge and discharge process, lithium ion is being migrated back and forth by pole piece top layer hole and will constrained by very big；In addition,
Lithium ion is also limited in the migration of pole piece thickness direction by tortuous transmission path, because high compacted density is determined inside pole piece
Can not possibly there is direct electrolyte passage and directly move to bottom from pole piece top layer for lithium ion.The new construction that the present invention is announced
The presence of the crackle in pole piece, had both solved lithium ion by pole piece top layer hole bottleneck system back and forth suffered by fast transferring
About, lithium ion tortuous transmission path restriction suffered by fast transferring inside pole piece is solved the problems, such as again, it is possible to significantly carrying
The high rate performance of high battery.
Description of the drawings
Fig. 1 is the structural representation of embodiments of the invention 1.
Fig. 2 is the structural representation of embodiments of the invention 2.
Fig. 3 is the structural representation of embodiments of the invention 3.
Fig. 4 is the structural representation of embodiments of the invention 4.
Fig. 5 is the structural representation of embodiments of the invention 5.
Specific embodiment
The present invention and its advantage are described in detail with reference to the accompanying drawings and examples, but embodiments of the invention
Not limited to this.
Embodiment 1, as shown in figure 1, a kind of anode pole piece of lithium ion battery, anode pole piece 1 is provided with crack structtire, splits
The opening of line structure is arranged at the top layer of pole piece, and the surface density of the crackle 3 of its crack structtire is 100m/mm2, the width of crackle 3
For 5um, the length of crackle 3 is 5um, and the cross sectional shape of crackle 3 is triangle, and pole piece thickness is completely through there is crackle 3.This positive pole
Pole piece 1 is obtained by stirring, being coated with, preparing crackle.Anode pole piece used 1 is as active material, according to just using cobalt acid lithium
Fill a prescription pole（Cobalt acid lithium：Kynoar:Superconduction carbon=96.0%:2.0%:2.0%）Stirring prepares anode sizing agent, then will
Anode sizing agent is coated with aluminum foil current collector and prepares anode pole piece 1, and then anode pole piece 1 is colded pressing（Compacted density is
4.20g/cc）, with cathode pole piece, barrier film, electrolyte and packaging bag finished product battery core is assembled into.In order to characterize new construction positive pole pole
Infiltration rate of the piece 1 to electrolyte, we are to drip 0.1g electrolyte by the anode pole piece 1 after colding pressing, and then measure pole piece
The time required for 0.1g electrolyte is fully absorbed, and is recorded in table 1 for contrast.In addition, we can also carry out 3 to battery core
C discharges and the test of 3C rate of charge, and test result is recorded in table 1 for contrasting.
Embodiment 2, as shown in Fig. 2 as different from Example 1：The surface density of the crackle 3 of the present embodiment is 1000m/
mm2, the width of crackle 3 is 12um, and the length of crackle 3 is 8um, the cross sectional shape of crackle 3 be it is trapezoidal, pole piece thickness completely through
There is crackle 3.Anode pole piece used 1 is that each group distribution ratio is in anode pole piece 1, nickel cobalt as active material using cobalt nickel cobalt manganese
Manganese：Kynoar:Superconduction carbon=96.0%:2.0%:2.0%.This anode pole piece 1 is colded pressing（Compacted density 4.20g/cc）, with
Cathode pole piece, barrier film, electrolyte and packaging bag are assembled into finished product battery core.
It is other same as Example 1, it is not repeated herein.
Embodiment 3, as shown in figure 3, as different from Example 2：The surface density of the crackle 3 of the present embodiment is 10m/mm2,
The width of crackle 3 is 1um, and the length of crackle 3 is 9um, and the cross sectional shape of crackle 3 is rectangle, and pole piece thickness not exclusively runs through to be had
Crackle.Anode pole piece used 1 is as active material, according to anode formula using LiFePO4（LiFePO4：Polyvinylidene fluoride
Alkene:Superconduction carbon=96.0%:2.0%:2.0%）Stirring prepares anode sizing agent, then by anode sizing agent in aluminum foil current collector
Coating prepares anode pole piece 1, and then anode pole piece 1 is colded pressing（Compacted density is 4.20g/cc）, with cathode pole piece, every
Film, electrolyte and packaging bag are assembled into finished product battery core.
It is other same as Example 2, it is not repeated herein.
Embodiment 4, as shown in figure 4, as different from Example 3：The surface density of the crackle 3 of the present embodiment is 10000m/
mm2, the width of crackle 3 is 20um, and the length of crackle 3 is 12um, and the cross sectional shape of crackle 3 is triangle and trapezoidal, pole piece thickness
Degree is completely through there is crackle 3.Anode pole piece used 1 is each group distribution ratio in anode pole piece 1 as active material using LiMn2O4
For LiMn2O4：Kynoar:Superconduction carbon=96.0%:2.0%:2.0%.After this anode pole piece 1 is colded pressing（Compacted density
4.20g/cc）, with cathode pole piece, barrier film, electrolyte and packaging bag finished product battery core is assembled into.
It is other same as Example 3, it is not repeated herein.
Embodiment 5, as shown in figure 5, as different from Example 4：The surface density of the crackle 3 of the present embodiment is 500m/
mm2, the width of crackle 3 is 7um, and the length of crackle 3 is more than 22um, and the cross sectional shape of crackle 3 is triangle, rectangle and trapezoidal.
Anode pole piece used 1 is that each group distribution ratio is in anode pole piece 1 as active material using LiMn2O4 and cobalt acid lithium, LiMn2O4+
Cobalt acid lithium：Kynoar:Superconduction carbon=96.0%:2.0%:2.0%.After this anode pole piece 1 is colded pressing（Compacted density 4.20g/
cc）, with cathode pole piece, barrier film, electrolyte and packaging bag finished product battery core is assembled into.
Comparative example 1, the anode pole piece of this comparative example does not have crack structtire.This anode pole piece is split by stirring, coating, preparation
Line is obtained.Each group distribution ratio is in anode pole piece, cobalt acid lithium：Kynoar:Superconduction carbon=96.0%:2.0%:2.0%.By this
After anode pole piece is colded pressing（Compacted density 4.20g/cc）, with cathode pole piece, barrier film, electrolyte and packaging bag finished product electricity is assembled into
Core.The infiltration rate of anode pole piece and cathode pole piece to electrolyte in order to characterize this comparative example, we are by after colding pressing
0.1g electrolyte is dripped on anode pole piece, then metering pole piece fully absorbs the time required for this 0.1g electrode solution, and records
In table 1 for contrast.In addition, we can also battery core carry out 3C electric discharges and the test of 3C rate of charge, test result is recorded in
Table 1 is used to contrast.
Such as table 1：Embodiment 1 ~ 5 and comparative example 1 absorb the time needed for 0.1g electrolyte, and the pole piece group to anode pole piece
Dress up and carry out after battery 3C discharge-rates performance and electric multiplying power test result.
From table 1 it follows that after using the electrodes of lithium-ion batteries with crack structtire proposed by the present invention, pole piece pair
The infiltration rate of electrolyte has and greatly improves；After the anode pole piece 1 in battery has crack structtire, the discharge-rate of battery
To have and be obviously improved.
The announcement and teaching of book according to the above description, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and changed.Therefore, above-mentioned specific embodiment is the invention is not limited in, every those skilled in the art exist
On the basis of the present invention it is done it is any conspicuously improved, replace or modification belongs to protection scope of the present invention.This
Outward, although some specific terms used in this specification, these terms merely for convenience of description, not to the present invention
Constitute any restriction.
Claims (7)
1. a kind of anode pole piece of lithium ion battery, it is characterised in that：The anode pole piece is provided with crack structtire, the crackle
The opening of structure is arranged at the top layer of pole piece, and the width of the crackle in the crack structtire is 1 ~ 20um, in the crack structtire
Crackle surface density be 10 ~ 1000m/m2。
2. the anode pole piece of lithium ion battery according to claim 1, it is characterised in that：Activity in the anode pole piece
Material is at least one in cobalt acid lithium, nickel cobalt manganese, LiFePO4 and LiMn2O4.
3. the anode pole piece of lithium ion battery according to claim 1, it is characterised in that：Crackle in the crack structtire
Width be 1 ~ 5um.
4. the anode pole piece of lithium ion battery according to claim 1, it is characterised in that：Crackle in the crack structtire
Length be at least 5um.
5. the anode pole piece of lithium ion battery according to claim 1, it is characterised in that：Crackle in the crack structtire
Surface density be 100 ~ 1000m/m2。
6. the anode pole piece of lithium ion battery according to claim 1, it is characterised in that：Crackle in the crack structtire
Cross sectional shape be triangle, trapezoidal and rectangle at least one.
7. a kind of lithium ion battery, including anode pole piece, cathode pole piece, be arranged at the anode pole piece and the cathode pole piece it
Between barrier film and electrolyte, it is characterised in that：The lithium ion battery is using any one of claim 1 ~ 6 with crackle knot
The anode pole piece of structure is used as electrodes of lithium-ion batteries.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310302191.2A CN103367701B (en) | 2013-07-18 | 2013-07-18 | Lithium ion battery positive electrode sheet and battery comprising positive electrode sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310302191.2A CN103367701B (en) | 2013-07-18 | 2013-07-18 | Lithium ion battery positive electrode sheet and battery comprising positive electrode sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103367701A CN103367701A (en) | 2013-10-23 |
| CN103367701B true CN103367701B (en) | 2017-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310302191.2A Active CN103367701B (en) | 2013-07-18 | 2013-07-18 | Lithium ion battery positive electrode sheet and battery comprising positive electrode sheet |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105977447B (en) * | 2016-07-21 | 2018-08-21 | 苏州协鑫集成科技工业应用研究院有限公司 | Negative plate and preparation method thereof and battery |
| CN108172763A (en) * | 2017-12-20 | 2018-06-15 | 贵州梅岭电源有限公司 | A kind of high power electrodes and preparation method thereof |
| CN115039255A (en) * | 2021-09-30 | 2022-09-09 | 宁德新能源科技有限公司 | Electrochemical device and electronic device including the same |
| CN114203959B (en) * | 2021-12-13 | 2024-01-23 | 东莞新能安科技有限公司 | Electrode assembly, electrochemical device, and electronic device |
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