CN105958124A - Lithium ion battery and preparation method therefor - Google Patents
Lithium ion battery and preparation method therefor Download PDFInfo
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- CN105958124A CN105958124A CN201610580100.5A CN201610580100A CN105958124A CN 105958124 A CN105958124 A CN 105958124A CN 201610580100 A CN201610580100 A CN 201610580100A CN 105958124 A CN105958124 A CN 105958124A
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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
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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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- 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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention relates to the field of a secondary battery, and specifically to a lithium ion battery and a preparation method therefor. The lithium ion battery provided by the invention comprises a negative plate, a positive plate, and a flat-shaped cell which is formed by winding a separator which is arranged between the negative plate and the positive plate; the positive plate is coated with a positive electrode material A1 at the corner of the cell; the plane layer of the cell is coated with a positive electrode material B1; the gram volume of the positive electrode material A1 is higher than that of the positive electrode material B1; and/or the negative plate is coated with a negative electrode material A2 at the corner of the cell; the plane layer of the cell is coated with a negative electrode material B2; and the gram volume of the negative electrode material A2 is lower than that of the negative electrode material B2. According to the lithium ion battery, by keeping the region, where the positive electrode is coated with the negative electrode in the inner ring of the battery, at a relatively high positive electrode/negative electrode capacity ratio, the interface performance at the corner of the battery is improved, the problem of lithium separation-out at the corner is solved, and the low-temperature discharge performance and the cyclic lithium separation-out of the battery are improved.
Description
Technical field
The application relates to secondary cell field, specifically, relating to a kind of lithium ion battery and preparation method thereof.
Background technology
Lithium ion battery has high-energy-density, high cycle performance, high voltage, low self-discharge and the advantage such as lightweight, it is widely used in the various portable type electronic products such as notebook computer, digital camera, mobile phone and wrist-watch, Apple product that is designed and that manufacture represents the elite of modern humans's technology especially now, leads the trend in epoch.Along with the extensive application of various portable type electronic products, people are more and more higher to the requirement of the performance of lithium ion battery, especially more and more higher to demands such as the energy density of lithium ion battery and cycle performances.
Battery is in cyclic process, embedding and the deintercalation of lithium ion can be carried out between the anode and cathode of battery, during lithium ion migrates from cathode to anode, restriction due to battery winding structure, the region of the negative electrode parcel anode in inner ring corner, the anode and cathode Capacity Ratio of battery is not enough, the too much Lithium-ion embeding of negative electrode is in anode, and anode does not has, and enough capacity are satisfied to be embedded lithium ion, causing unnecessary lithium ion to separate out in the region of inner ring negative electrode bag anode, anode analysis lithium can seriously reduce the cycle performance of battery.
The conventional process that current lithium ion battery is used is winding-structure design, first it is that the slurry stirred is coated on anode and cathode collector with certain speed, the most conventional coating process is broadly divided into transfer coated and extrusion coated (slot die), it is coated with out the length of anode and cathode diaphragm by both technique at collection liquid surface, then cuts.It is wound with isolating membrane arrangement in order after pole piece clear area soldering polar ear after cutting, the encapsulation of naked battery core and aluminum plastic film, fluid injection and chemical conversion molding after having wound, can be carried out.
From battery design, analysing lithium to prevent battery from use occurring, the anode and cathode Capacity Ratio of battery is typically designed to be needed more than certain numerical value, and guarantee battery does not occur significantly to analyse lithium during normal use, causes battery failure.Anode and cathode Capacity Ratio such as design is too big, battery can be avoided in use to occur to analyse lithium, but battery core thickness can be caused thicker, the serious energy density reducing battery.
In consideration of it, special, the application is proposed.
Summary of the invention
The primary goal of the invention of the application is to propose a kind of lithium ion battery and preparation method thereof.
Second goal of the invention of the application is to propose the preparation method of this lithium ion battery.
Completing the purpose of the application, the technical scheme of employing is:
The application relates to a kind of lithium ion battery, and including by cathode sheet, anode pole piece and the flat battery core of membrane winding being arranged between described cathode sheet and described anode pole piece, described anode pole piece is coated with anode material A in the corner of described battery core1, at the plane layer of described battery core, it is coated with anode material B1, described anode material A1Gram volume higher than described anode material B1；And/or, described cathode sheet is coated with cathode material A in the corner of described battery core2, at the plane layer of described battery core, it is coated with cathode material B2, described cathode material A2Gram volume less than described cathode material B2。
Preferably, described anode material A1Gram volume than described anode material B1Gram volume high 1～100mAh/g, preferably 5～20mAh/g.
Preferably, described cathode material A2Gram volume than described cathode material B2Gram volume low 1～100mAh/g, preferably 5～20mAh/g.
Preferably, described anode material B1Gram volume be 300～400mAh/g, described anode material A1Gram volume be 301～500mAh/g.
Preferably, described cathode material A2Gram volume is 140～230mAh/g, described cathode material B2Gram volume be 141～330mAh/g.
Preferably, described cathode sheet is less than the coating weight at described plane layer at the coating weight of described corner.
Preferably, described anode pole piece is more than the coating weight at described plane layer at the coating weight of described corner.
Preferably, described anode material A1A length of the 1～30mm of institute's dispensing area；And/or, described cathode material A2A length of the 1～30mm of institute's dispensing area.
Preferably, described anode material A1Institute's dispensing area and described anode material B1Gap between institute's dispensing area is 0～2mm；And/or, described cathode material A2Institute's dispensing area and described anode material B2Gap between institute's dispensing area is 0～2mm.
Preferably, described anode material A1, anode material B1At least one being respectively selected from native graphite, Delanium, soft carbon, hard carbon, MCMB, tin-based oxide, Sn-polymetallic orefield, silicon-carbon alloy and lithium titanate the most independent；And/or, described cathode material A2, cathode material B2The most independent is respectively selected from LiCoO2、LiNiO2、LiMnO2、LiFePO4、LixNiyCozMnO2At least one, 0 < x < 1,0 < y < 1,0 < z < 1.
The application further relates to the preparation method of this lithium ion battery, it is characterised in that at least one in the following manner of the coating of pole piece in described preparation method:
(1) full wafer coated cathode material on the collector of described cathode sheet；Region coated anode materials A corresponding to corner on the collector of described anode pole piece1, region coated anode material B corresponding to plane layer on the collector of described anode pole piece1；Or
(2) full wafer coated anode material on the collector of described anode pole piece；Region coated cathode materials A corresponding to corner on the collector of described cathode sheet2, on the collector of described cathode sheet at plane layer corresponding to region coated cathode material B2；Or
(3) region coated anode materials A corresponding to corner on the collector of described anode pole piece1, region coated anode material B corresponding to plane layer on the collector of described anode pole piece1；Region coated cathode materials A corresponding to corner on the collector of described cathode sheet2, on the collector of described cathode sheet at plane layer corresponding to region coated cathode material B2；Or
(4) full wafer coated cathode material on the collector of described cathode sheet, and described cathode sheet is less than the coating weight at described plane layer at the coating weight of described corner；Region coated anode materials A corresponding to corner on the collector of described anode pole piece1, region coated anode material B corresponding to plane layer on the collector of described anode pole piece1；Or
(5) full wafer coated anode material on the collector of described anode pole piece, and described anode pole piece is more than the coating weight at described plane layer at the coating weight of described corner；Region coated cathode materials A corresponding to corner on the collector of described cathode sheet2, on the collector of described cathode sheet at plane layer corresponding to region coated cathode material B2；Or
(6) region coated anode materials A corresponding to corner on the collector of described anode pole piece1, region coated anode material B corresponding to plane layer on the collector of described anode pole piece1, and described anode pole piece at the coating weight of described corner more than the coating weight at described plane layer；Region coated cathode materials A corresponding to corner on the collector of described cathode sheet2, on the collector of described cathode sheet at plane layer corresponding to region coated cathode material B2；Or
(7) region coated anode materials A corresponding to corner on the collector of described anode pole piece1, region coated anode material B corresponding to plane layer on the collector of described anode pole piece1；Region coated cathode materials A corresponding to corner on the collector of described cathode sheet2, on the collector of described cathode sheet at plane layer corresponding to region coated cathode material B2, and described cathode sheet at the coating weight of described corner less than coating weight at described plane layer；Or
(8) region coated anode materials A corresponding to corner on the collector of described anode pole piece1, region coated anode material B corresponding to plane layer on the collector of described anode pole piece1, and described anode pole piece at the coating weight of described corner more than the coating weight at described plane layer；Region coated cathode materials A corresponding to corner on the collector of described cathode sheet2, on the collector of described cathode sheet at plane layer corresponding to region coated cathode material B2, and described cathode sheet at the coating weight of described corner less than the coating weight at described plane layer.
The technical scheme of the application at least has a following beneficial effect:
The application is by being coated with different materials on a current collector, the region making the especially battery inner ring negative electrode bag anode in region at battery corner regional peace face keeps higher both positive and negative polarity Capacity Ratio, improve battery corner interface performance, the problem solving corner's analysis lithium, improves the low temperature performance of battery and improves circulating battery analysis lithium.
The application is coated by using different materials, corner region uses anode material or the cathode material of low gram volume of high gram volume, the particularly interface of corner's negative electrode bag anode in cathode sheet is conducive to go out more preferably to embed lithium ion, the gram volume of the negative electrode improving battery plays, and improves the energy density of battery.
Accompanying drawing illustrates:
Fig. 1 is the schematic cross-section of the homogeneous coating of cathode sheet；
Fig. 2 is the schematic cross-section of cathode sheet gap coating；
Fig. 3 is the schematic cross-section of the homogeneous coating of anode pole piece；
Fig. 4 is the schematic cross-section of anode pole piece gap coating；
Fig. 5 is the schematic diagram of the battery core of the winding after the coating of cathode sheet gap, the homogeneous coating of anode pole piece；
Wherein:
1-cathode sheet；
11-negative electrode diaphragm；
12-cathode current collector；
13-corner negative electrode diaphragm；
Negative electrode diaphragm at 14-plane layer；
15-cathode tab；
2-anode pole piece；
21-anode diaphragm；
22-anode collector；
Anode diaphragm at 23-plane layer；
24-corner anode diaphragm；
25-anode lug；
3-barrier film；
4-is positioned at the anode parcel cathodic coating panel region of battery corner；
5-is positioned at the negative electrode parcel anode film panel region of battery corner.
In order to make present invention purpose, technical scheme and Advantageous Effects become apparent from, below in conjunction with the drawings and specific embodiments, the application is described in detail.It should be appreciated that the detailed description of the invention described in this specification is only used to explain the application, it is not intended to limit the application.
Detailed description of the invention
The application relates to a kind of lithium ion battery, including by cathode sheet, anode pole piece, the flat battery core of membrane winding that is arranged between cathode sheet and anode pole piece,
Wherein, cathode sheet includes cathode current collector and is coated on the negative electrode diaphragm of cathode current collector both sides, and anode pole piece includes anode collector and is coated on the anode diaphragm of anode collector both sides；
Anode pole piece is coated with anode material A in the corner of battery core1, at the plane layer of battery core, it is coated with anode material B1, anode material A1Gram volume > anode material B1Gram volume；
And/or, cathode sheet is coated with cathode material A in the corner of battery core2, at the plane layer of battery core, it is coated with cathode material B2, cathode material A2Gram volume < cathode material B2Gram volume.
Wherein, plane layer and corner are to be demarcation line by the point that flat battery circular arc tangential line slope around the corner is 0.
As a kind of improvement of the application lithium ion battery, anode material A1Gram volume than anode material B1Gram volume high 1～100mAh/g, preferably 5～20mAh/g.If anode material A1Gram volume and anode material B1Gram volume difference too small, if gram volume difference too small, to corner analysis lithium improvement inconspicuous.Have big difference, cause battery cost to increase.
As a kind of improvement of the application lithium ion battery, cathode material A2Gram volume than cathode material B2Gram volume low 1～100mAh/g, preferably 5～20mAh/g.If cathode material A2Gram volume and cathode material B2Gram volume difference too small, to corner analysis lithium improvement inconspicuous.Have big difference, battery capacity can be affected, reduce the energy density of battery greatly.
As a kind of improvement of the application lithium ion battery, anode material B1Gram volume be 300～400mAh/g, anode material A1Gram volume be 301～500mAh/g.
As a kind of improvement of the application lithium ion battery, cathode material A2Gram volume is 140～230mAh/g, cathode material B2Gram volume be 141～330mAh/g.
As a kind of improvement of the application lithium ion battery, cathode sheet coating weight around the corner is less than the coating weight at plane layer.
As a kind of improvement of the application lithium ion battery, anode pole piece coating weight around the corner is more than the coating weight at plane layer.
Wherein,
Solid content × negative electrode the diaphragm area of battery capacity=negative electrode coating weight × negative electrode gram volume × negative electrode diaphragm active substance
Therefore, coating weight is in making cell process, according to the gram volume of anode and cathode material, is coated with different anode and cathode coating weights and can give play to different battery capacities, mainly can be controlled by the thickness of coating.
As a kind of improvement of the application lithium ion battery, at cathode sheet coating weight around the corner and plane layer, the difference of coating weight is 0.1～1.5mg/cm2；If cathode sheet coating weight difference is too small, the improvement to corner's analysis lithium is inconspicuous.Have big difference, battery capacity can be affected, reduce the energy density of battery greatly.
As a kind of improvement of the application lithium ion battery, at anode pole piece coating weight around the corner and plane layer, the difference of coating weight is 0.1～1.5mg/cm2.If anode pole piece coating weight difference is too small, if gram volume difference is too small, the improvement to corner's analysis lithium is inconspicuous.Have big difference, battery capacity can be affected.
As a kind of improvement of the application lithium ion battery, anode material A1, anode material B1At least one being respectively selected from native graphite, Delanium, soft carbon, hard carbon, MCMB, tin-based oxide, Sn-polymetallic orefield, silicon-carbon alloy and lithium titanate the most independent.
Wherein, A1、B1Can be selected for any of the above material, it is only necessary to meet A1Gram volume > B1Gram volume；Concrete, A1Can be selected for silicon-carbon alloy and one that tinbase meets in oxidation, B1Can be selected for the one in Delanium and soft carbon.
As a kind of improvement of the application lithium ion battery, cathode material A2, cathode material B2The most independent is respectively selected from LiCoO2、LiNiO2、LiMnO2、LiFePO4、LixNiyCozMnO2At least one, 0 < x < 1,0 < y < 1,0 < z < 1.
Wherein, A2、B2Can be selected for any of the above material, it is only necessary to meet A2Gram volume < B2Gram volume；Concrete, A2Can be selected for LiCoO2、LiNiO2、LiMnO2In one, B2Can be selected for LiFePO4、LixNiyCozMnO2In one.
As a kind of improvement of the application lithium ion battery, the thickness of flat battery core is 1～10mm.
As a kind of improvement of the application lithium ion battery, anode material A1A length of the 1～30mm of institute's dispensing area；And/or, negative electrode pole materials A2A length of the 1～30mm of institute's dispensing area.
As a kind of improvement of the application lithium ion battery, anode material A1Institute's dispensing area and anode material B1Gap between institute's dispensing area is 0～2mm；And/or, cathode material A2Institute's dispensing area and anode material B2Gap between institute's dispensing area is 0～2mm.Technique optimum condition is seamless coating, and reduces the gap between two applying area, to avoid the loss of energy density as far as possible.
A kind of improvement as the lithium ion battery of the application, this lithium ion battery also includes cathode tab and anode lug, and the position that negative electrode and anode lug are arranged has: be respectively positioned on battery inner ring, be respectively positioned on battery outer ring, cathode tab is positioned at battery inner ring and anode lug is positioned at battery outer ring, cathode tab is positioned at battery outer ring and anode lug is positioned at battery inner ring.
As a kind of improvement of the lithium ion battery of the application, anode and cathode lug thickness is 0.05～0.5mm.
As a kind of improvement of the lithium ion battery of the application, anode and cathode collector thickness is 0.004～0.05mm.
As a kind of improvement of the lithium ion battery of the application, the thickness of isolating membrane is 0.004～0.05mm.
The application further relates to the preparation method of this lithium ion battery, including coating, the drying of pole piece, colds pressing, soldering polar ear, is packaged the steps such as fluid injection after winding with isolating membrane, and wherein, the coating method of pole piece is selected from:
(1) full wafer coated cathode material on the collector of cathode sheet；Region coated anode materials A corresponding to corner on the collector of anode pole piece1, region coated anode material B corresponding to plane layer on the collector of anode pole piece1；Or
(2) full wafer coated anode material on the collector of anode pole piece；Region coated cathode materials A corresponding to corner on the collector of cathode sheet2, on the collector of cathode sheet at plane layer corresponding to region coated cathode material B2；Or
(3) region coated anode materials A corresponding to corner on the collector of anode pole piece1, region coated anode material B corresponding to plane layer on the collector of anode pole piece1；Region coated cathode materials A corresponding to corner on the collector of cathode sheet2, on the collector of cathode sheet at plane layer corresponding to region coated cathode material B2；Or
(4) full wafer coated cathode material on the collector of cathode sheet, and the coating weight that cathode sheet is around the corner is less than the coating weight at plane layer；Region coated anode materials A corresponding to corner on the collector of anode pole piece1, region coated anode material B corresponding to plane layer on the collector of anode pole piece1；Or
(5) full wafer coated anode material on the collector of anode pole piece, and institute anode pole piece coating weight around the corner is more than the coating weight at plane layer；Region coated cathode materials A corresponding to corner on the collector of cathode sheet2, on the collector of cathode sheet at plane layer corresponding to region coated cathode material B2；Or
(6) region coated anode materials A corresponding to corner on the collector of anode pole piece1, region coated anode material B corresponding to plane layer on the collector of anode pole piece1, and the coating weight that anode pole piece is around the corner is more than the coating weight at plane layer；Region coated cathode materials A corresponding to corner on the collector of cathode sheet2, on the collector of cathode sheet at plane layer corresponding to region coated cathode material B2；Or
(7) region coated anode materials A corresponding to corner on the collector of anode pole piece1, region coated anode material B corresponding to plane layer on the collector of anode pole piece1；Region coated cathode materials A corresponding to corner on the collector of cathode sheet2, on the collector of cathode sheet at plane layer corresponding to region coated cathode material B2, and cathode sheet at the coating weight of described corner less than coating weight at plane layer；Or
(8) region coated anode materials A corresponding to corner on the collector of anode pole piece1, region coated anode material B corresponding to plane layer on the collector of anode pole piece1, and the coating weight that anode pole piece is around the corner is more than the coating weight at plane layer；Region coated cathode materials A corresponding to corner on the collector of cathode sheet2, on the collector of cathode sheet at plane layer corresponding to region coated cathode material B2, and cathode sheet at the coating weight of described corner less than the coating weight at plane layer.
In this application, the active material being coated with same gram volume on a current collector is homogeneous coating.The most around the corner or corresponding region, plane layer place first coats the active material of a kind of gram volume, forming strip distribution, the active material of the another kind of gram volume of the most remaining region coating on a current collector, this coating method is gap coating.
Equally, it is possible to use the mode of gap coating to be coated with the slurry of different coating weight.
Preparation example
Cathode sheet
1
Preparation:
1, homogeneous coating: the schematic cross-section of cathode sheet coating forms negative electrode diaphragm 11 as it is shown in figure 1, the slurry of the cathode material stirred is passed through transfer coated to cathode current collector 12.
2, the gap coating of different gram volumes: the schematic cross-section of cathode sheet coating is as in figure 2 it is shown, the cathode material A that will stir2Slurry be coated on collector 12 region corresponding to corner, form diaphragm 13, the cathode material B that will stir2Slurry be coated on collector 12 at plane layer corresponding to region, form diaphragm 14；Form the cathode sheet 1 after the coating of gap；
3, the gap coating of Different Weight: the slurry of the cathode material stirred is coated on collector 12, and the coating weight that cathode sheet is around the corner is less than the coating weight at plane layer；
Anode pole piece 2 Preparation:
1, the gap coating of different gram volumes: the sectional view of anode pole piece coating is as it is shown on figure 3, the anode material B that will stir1Slurry be applied in anode collector 22 region corresponding to plane layer, form anode diaphragm 23, the anode material A that will stir1Slurry be applied in anode collector 22 region corresponding to corner, form anode diaphragm 24, form the anode pole piece 2 after the coating of gap；
2, the gap coating of Different Weight: the slurry of the anode material stirred is applied in anode collector 22, and the coating weight that anode pole piece is around the corner is more than the coating weight at plane layer；
3, homogeneous coating: the slurry of the anode material stirred as shown in Figure 4, is passed through transfer coated and forms anode diaphragm 21 to anode collector 22 by the sectional view of anode pole piece coating.
The preparation of battery core:
On the cathode current collector 12 of innermost circle, wide 5mm it is welded with before Han Jie, the aluminium flake of thickness 0.1mm, as cathode tab 15, innermost circle anode collector 22 is welded with wide 5mm, and thickness is that the nickel sheet of 0.1 is as anode lug 25, when winding starts, anode and cathode lug is all located in the inner ring structure of battery core.Lithium ion battery winds in the same direction after being stacked gradually by cathode sheet 1, isolating membrane 3 and anode pole piece 2 and forms.Battery core after having wound and aluminum plastic film are packaged rear fluid injection chemical conversion, become finished product battery core after carrying out excising airbag molding.
Wherein, the winding-structure schematic diagram after cathode sheet 1 gap coating, the homogeneous coating of anode pole piece 2 is as shown in Figure 5.
Embodiment 1
The present embodiment relates to a kind of lithium ion battery, including cathode sheet and anode pole piece.
According to the preparation method of above-mentioned preparation example, prepare cathode sheet as shown in table 1 and anode pole piece, and be prepared as battery core.
Table 1: anode and cathode pole coating gram volume
According to the preparation method of above-mentioned preparation example, prepare cathode sheet as shown in table 2 and anode pole piece, and be prepared as battery core.
Table 2: anode and cathode pole coating gram volume and weight
Experimental example
(1)
Analysis lithium phenomenon
Respectively from embodiment 1～5 and comparative example 1～2 battery respectively choose 10 and be circulated test, after circulating 100 times, disassemble battery, observe anode pole piece corner 4 and the analysis lithium situation of corner 5, there is the number of batteries of analysis lithium in statistics anode pole piece, acquired results is shown in Table 3.
Table 3: analysis lithium phenomenon testing result
(2)
Capacity and volume energy density
To embodiment 1～5 and the battery that provides of comparative example 1～2 carry out volume test and volume energy density test, acquired results is shown in table 4.
Wherein, volume test is tested under 25 DEG C of environment, and what capacity took is 0.2C discharge capacity, volume energy density=capacity × platform voltage/volume.
Table 4: capacity and volume energy density testing result
| Group | Average size/mAh | Average thickness/mm | Average external volume energy density/Wh/L |
| Battery core 1 | 2140 | 4.47 | 545 |
| Battery core 2 | 2170 | 4.48 | 552 |
| Battery core 3 | 2190 | 4.47 | 557 |
| Battery core 4 | 2155 | 4.47 | 548 |
| Battery core 5 | 2120 | 4.48 | 539 |
| Battery core 6 | 2130 | 4.49 | 540 |
| Battery core 7 | 2120 | 4.47 | 520 |
| Comparative example battery core 1 | 2100 | 4.47 | 530 |
| Comparative example battery core 2 | 2120 | 4.48 | 540 |
(3)
Cycle performance
Respectively from embodiment 1～5 and comparative example 1～2 battery respectively choose 10 and be circulated performance test:
Test condition is: at 45 DEG C, 0.7C constant-current charge is to 4.35V, and under 4.35V, constant-voltage charge is to 0.05C, then 1.0C constant-current discharge is to 3.0V, records initial capacity, and repeats above step 500 times, is discharged to the capacity of 3.0V after every 50 circulations with 0.2C.Test result is as shown in table 5.
Table 5: cycle performance testing result
| Group | 100 times | 200 times | 300 times | 400 times | 500 times | 600 times | 700 times |
| Battery core 1 | 2087 | 2033 | 1973 | 1950 | 1926 | 2087 | 2033 |
| Battery core 2 | 2129 | 2077 | 2007 | 1979 | 1955 | 2129 | 2077 |
| Battery core 3 | 2155 | 2091 | 2030 | 2002 | 1978 | 2155 | 2091 |
| Battery core 4 | 2103 | 2049 | 1983 | 1942 | 1918 | 2103 | 2049 |
| Battery core 5 | 2063 | 2008 | 1940 | 1916 | 1880 | 2063 | 2008 |
| Battery core 6 | 2061 | 2021 | 1960 | 1937 | 1910 | 2061 | 2021 |
| Battery core 7 | 2055 | 2011 | 1943 | 1921 | 1908 | 2055 | 2011 |
| Comparative example battery core 1 | 2001 | 1932 | 1873 | 1785 | 1743 | 2001 | 1932 |
| Comparative example battery core 2 | 2042 | 1997 | 1936 | 1885 | 1842 | 2042 | 1997 |
Knowable to table 4 and table 5, compared with the battery using conventional coating processes to prepare, the lithium battery of the application, by being coated with anode material and/or the negative-type of different gram volume, can improve the energy density of battery, and battery core still has higher capability retention after 500 circulations.
Below being described in detail the application, above-mentioned embodiment can also be changed and revise by the application those skilled in the art.Therefore, the application is not limited to detailed description of the invention disclosed and described above, should also be as some modifications and changes of the application falling in the protection domain of claims hereof.Although additionally, employ some specific terms in this specification, but these terms are merely for convenience of description, the application is not constituted any restriction.
Claims (11)
1. a lithium ion battery, including by cathode sheet, anode pole piece be arranged at described negative electrode
The flat battery core of the membrane winding between pole piece and described anode pole piece, it is characterised in that institute
State anode pole piece and be coated with anode material A in the corner of described battery core1, at the plane layer of described battery core
Place is coated with anode material B1, described anode material A1Gram volume higher than described anode material B1；
And/or, described cathode sheet is coated with cathode material A in the corner of described battery core2, at described electricity
Cathode material B it is coated with at the plane layer of core2, described cathode material A2Gram volume less than described the moon
Pole material B2。
Lithium ion battery the most according to claim 1, it is characterised in that described anode material
A1Gram volume than described anode material B1Gram volume high 1～100mAh/g, preferably 5～20
mAh/g。
Lithium ion battery the most according to claim 1, it is characterised in that described cathode material
A2Gram volume than described cathode material B2Gram volume low 1～100mAh/g, preferably 5～20
mAh/g。
Lithium ion battery the most according to claim 1, it is characterised in that described anode material
B1Gram volume be 300～400mAh/g, described anode material A1Gram volume be 301～
500mAh/g。
Lithium ion battery the most according to claim 1, it is characterised in that described cathode material
A2Gram volume is 140～230mAh/g, described cathode material B2Gram volume be 141～
330mAh/g。
Lithium ion battery the most according to claim 1, it is characterised in that described cathode sheet
Coating weight in described corner is less than the coating weight at described plane layer.
Lithium ion battery the most according to claim 1, it is characterised in that described anode pole piece
Coating weight in described corner is more than the coating weight at described plane layer.
Lithium ion battery the most according to claim 1, it is characterised in that described anode material
A1A length of the 1～30mm of institute's dispensing area；And/or, described cathode material A2Institute's dispensing area
A length of 1～30mm.
Lithium ion battery the most according to claim 1, it is characterised in that described anode material
A1Institute's dispensing area and described anode material B1Gap between institute's dispensing area is 0～2mm；With/
Or, described cathode material A2Institute's dispensing area and described anode material B2Between between institute's dispensing area
Gap is 0～2mm.
Lithium ion battery the most according to claim 1, it is characterised in that described anode material
A1, anode material B1The most independent be respectively selected from native graphite, Delanium, soft carbon, hard carbon,
In MCMB, tin-based oxide, Sn-polymetallic orefield, silicon-carbon alloy and lithium titanate extremely
Few one；And/or, described cathode material A2, cathode material B2The most independent is respectively selected from
LiCoO2、LiNiO2、LiMnO2、LiFePO4、LixNiyCozMnO2At least one, 0 < x < 1,
0 < y < 1,0 < z < 1.
The system of 11. 1 kinds of lithium ion batteries as described in claim 1～10 as described in any claim
Preparation Method, it is characterised in that in described preparation method, the coating of pole piece is selected from the following manner at least
A kind of:
(1) full wafer coated cathode material on the collector of described cathode sheet；In described anode pole
Region coated anode materials A corresponding to corner on the collector of sheet1, at the collection of described anode pole piece
Region coated anode material B corresponding to plane layer on fluid1；Or
(2) full wafer coated anode material on the collector of described anode pole piece；In described negative electrode pole
Region coated cathode materials A corresponding to corner on the collector of sheet2, at the collection of described cathode sheet
On fluid at plane layer corresponding to region coated cathode material B2；Or
(3) region coated anode material corresponding to corner on the collector of described anode pole piece
A1, region coated anode material B corresponding to plane layer on the collector of described anode pole piece1；?
Region coated cathode materials A corresponding to corner on the collector of described cathode sheet2, at described the moon
On the collector of pole pole piece at plane layer corresponding to region coated cathode material B2；Or
(4) full wafer coated cathode material on the collector of described cathode sheet, and described negative electrode pole
Sheet is less than the coating weight at described plane layer at the coating weight of described corner；In described anode pole
Region coated anode materials A corresponding to corner on the collector of sheet1, at the collection of described anode pole piece
Region coated anode material B corresponding to plane layer on fluid1；Or
(5) full wafer coated anode material on the collector of described anode pole piece, and described anode pole
Sheet is more than the coating weight at described plane layer at the coating weight of described corner；In described negative electrode pole
Region coated cathode materials A corresponding to corner on the collector of sheet2, at the collection of described cathode sheet
On fluid at plane layer corresponding to region coated cathode material B2；Or
(6) region coated anode material corresponding to corner on the collector of described anode pole piece
A1, region coated anode material B corresponding to plane layer on the collector of described anode pole piece1, and
Described anode pole piece is more than the coating weight at described plane layer at the coating weight of described corner；?
Region coated cathode materials A corresponding to corner on the collector of described cathode sheet2, at described the moon
On the collector of pole pole piece at plane layer corresponding to region coated cathode material B2；Or
(7) region coated anode material corresponding to corner on the collector of described anode pole piece
A1, region coated anode material B corresponding to plane layer on the collector of described anode pole piece1；?
Region coated cathode materials A corresponding to corner on the collector of described cathode sheet2, at described the moon
On the collector of pole pole piece at plane layer corresponding to region coated cathode material B2, and described negative electrode pole
Sheet is less than the coating weight at described plane layer at the coating weight of described corner；Or
(8) region coated anode material corresponding to corner on the collector of described anode pole piece
A1, region coated anode material B corresponding to plane layer on the collector of described anode pole piece1, and
Described anode pole piece is more than the coating weight at described plane layer at the coating weight of described corner；?
Region coated cathode materials A corresponding to corner on the collector of described cathode sheet2, at described the moon
On the collector of pole pole piece at plane layer corresponding to region coated cathode material B2, and described negative electrode pole
Sheet is less than the coating weight at described plane layer at the coating weight of described corner.
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| CN114759272A (en) * | 2022-05-17 | 2022-07-15 | 宁德新能源科技有限公司 | Electrode assembly, electrochemical device comprising same and electronic device |
| CN114824508A (en) * | 2022-05-17 | 2022-07-29 | 宁德新能源科技有限公司 | Electrochemical device and electronic device including the same |
| WO2022165728A1 (en) * | 2021-02-04 | 2022-08-11 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery, and device and method for manufacturing electrode assembly |
| CN115084428A (en) * | 2022-06-30 | 2022-09-20 | 东莞锂威能源科技有限公司 | Method for improving lithium precipitation at corner of roll core, preparation process of battery and battery |
| WO2022222092A1 (en) * | 2021-04-22 | 2022-10-27 | 宁德时代新能源科技股份有限公司 | Electrode assembly and manufacturing method and manufacturing system therefor, battery cell, and battery |
| WO2024007319A1 (en) * | 2022-07-08 | 2024-01-11 | 宁德时代新能源科技股份有限公司 | Pole piece, secondary battery, battery module, battery pack, and electrical apparatus |
| WO2024098171A1 (en) * | 2022-11-07 | 2024-05-16 | 宁德时代新能源科技股份有限公司 | Battery cell and preparation method therefor, secondary battery, and electrical apparatus |
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| CN114759272A (en) * | 2022-05-17 | 2022-07-15 | 宁德新能源科技有限公司 | Electrode assembly, electrochemical device comprising same and electronic device |
| CN114824508A (en) * | 2022-05-17 | 2022-07-29 | 宁德新能源科技有限公司 | Electrochemical device and electronic device including the same |
| CN115084428A (en) * | 2022-06-30 | 2022-09-20 | 东莞锂威能源科技有限公司 | Method for improving lithium precipitation at corner of roll core, preparation process of battery and battery |
| WO2024007319A1 (en) * | 2022-07-08 | 2024-01-11 | 宁德时代新能源科技股份有限公司 | Pole piece, secondary battery, battery module, battery pack, and electrical apparatus |
| WO2024098171A1 (en) * | 2022-11-07 | 2024-05-16 | 宁德时代新能源科技股份有限公司 | Battery cell and preparation method therefor, secondary battery, and electrical apparatus |
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