CN105958124B - A kind of lithium ion battery and preparation method thereof - Google Patents

A kind of lithium ion battery and preparation method thereof Download PDF

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Publication number
CN105958124B
CN105958124B CN201610580100.5A CN201610580100A CN105958124B CN 105958124 B CN105958124 B CN 105958124B CN 201610580100 A CN201610580100 A CN 201610580100A CN 105958124 B CN105958124 B CN 105958124B
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anode
cathode
collector
coating
pole piece
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CN105958124A (en
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赵伟
陶涛
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Ningde Amperex Technology Ltd
Dongguan Amperex Technology Ltd
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Ningde Amperex Technology Ltd
Dongguan Amperex Technology Ltd
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)

Abstract

This application involves secondary cell fields, specifically, are related to a kind of lithium ion battery and preparation method thereof.The lithium ion battery of the application includes the flat battery core made of cathode sheet, anode pole piece and the membrane winding that is set between cathode sheet and anode pole piece, and anode pole piece is coated with anode material A in the corner of battery core1, anode material B is coated at the plane layer of battery core1, anode material A1Gram volume be higher than anode material B1；And/or cathode sheet is coated with cathode material A in the corner of battery core2, cathode material B is coated at the plane layer of battery core2, cathode material A2Gram volume be less than cathode material B2.The application improves battery corner interface performance, solves the problems, such as that lithium is analysed by corner, improve the low temperature performance of battery and improve circulating battery analysis lithium by making the region of battery inner ring cathode packet anode keep higher positive and negative anodes capacity ratio.

Description

A kind of lithium ion battery and preparation method thereof
Technical field
This application involves secondary cell fields, specifically, are related to a kind of lithium ion battery and preparation method thereof.
Background technology
Lithium ion battery has many advantages, such as high-energy density, high circulation performance, high voltage, low self-discharge and light-weight, quilt It is widely used in the various portable electronic products such as laptop, digital camera, mobile phone and wrist-watch, especially now The designed products with manufacture of Apple represent the essence of modern humans' technology, lead the trend in epoch.With various portable The extensive use of formula electronic product, requirement of the people to the performance of lithium ion battery is also higher and higher, especially to lithium-ion electric The demands such as the energy density in pond and cycle performance are also higher and higher.
Battery can carry out the insertion and deintercalation of lithium ion in cyclic process between the anode and cathode of battery, when lithium ion from During cathode is migrated to anode, due to the limitation of battery winding structure, the cathode in inner ring corner wraps up the area of anode Domain, than insufficient, the excessive lithium ion of cathode is embedded into anode for the anode and cathode capacity of battery, and anode it is not enough capacity it is full Foot is embedded in lithium ion, and extra lithium ion is caused to be precipitated in the region of inner ring cathode packet anode, and anode analyses lithium meeting The serious cycle performance for reducing battery.
Conventional process used by current lithium ion battery is winding-structure design, is the slurry that will be stirred evenly first It is coated on anode and cathode collector with certain speed, currently used coating process is broadly divided into transfer coated and extrusion It is coated with (slot die), is coated with out the length of anode and cathode diaphragm in collection liquid surface by both techniques, is then cut. It will be wound, can be carried out after the completion of winding naked with the arrangement of isolation film in order after pole piece clear area soldering polar ear after cutting The encapsulation of battery core and aluminum plastic film, fluid injection and chemical conversion are molded.
From battery design, battery occurs to analyse lithium in use in order to prevent, and the anode and cathode capacity of battery is than one As design need be more than certain numerical value, just can guarantee that battery does not occur significantly to analyse lithium during normal use, lead to battery Failure.Anode and cathode capacity ratio such as design is too big, can in use occur to analyse lithium to avoid battery, but can lead to battery core Thickness is thicker, the serious energy density for reducing battery.
In consideration of it, special propose the application.
Invention content
The primary goal of the invention of the application is to propose a kind of lithium ion battery and preparation method thereof.
The second goal of the invention of the application is to propose the preparation method of the lithium ion battery.
Complete the application purpose, the technical solution used for：
This application involves a kind of lithium ion batteries, including by cathode sheet, anode pole piece and are set to the cathode sheet Flat battery core made of membrane winding between the anode pole piece, the anode pole piece are applied in the corner of the battery core It is covered with anode material A1, anode material B is coated at the plane layer of the battery core1, the anode material A1Gram volume be higher than The anode material B1；And/or the cathode sheet is coated with cathode material A in the corner of the battery core2, in the battery core Plane layer at be coated with cathode material B2, the cathode material A2Gram volume be less than the cathode material B2。
Preferably, the anode material A1Gram volume than the anode material B1Gram volume high 1~100mAh/g, it is excellent Select 5~20mAh/g.
Preferably, the cathode material A2Gram volume than the cathode material B2Gram volume low 1~100mAh/g, it is excellent Select 5~20mAh/g.
Preferably, the anode material B1Gram volume be 300~400mAh/g, the anode material A1Gram volume be 301~500mAh/g.
Preferably, the cathode material A2Gram volume is 140~230mAh/g, the cathode material B2Gram volume be 141 ~330mAh/g.
Preferably, the cathode sheet is less than the coating weight at the plane layer in the coating weight of the corner.
Preferably, the anode pole piece is more than the coating weight at the plane layer in the coating weight of the corner.
Preferably, the anode material A1The length of institute's dispensing area is 1~30mm；And/or the cathode material A2Institute The length of dispensing area is 1~30mm.
Preferably, the anode material A1Institute's dispensing area and the anode material B1Gap between institute's dispensing area is 0 ~2mm；And/or the cathode material A2Institute's dispensing area and the anode material B2Gap between institute's dispensing area is 0~ 2mm。
Preferably, the anode material A1, anode material B1The separate natural graphite, artificial graphite, soft of being respectively selected from At least one of carbon, hard carbon, mesocarbon microspheres, tin-based oxide, Sn-polymetallic orefield, silicon-carbon alloy and lithium titanate； And/or the cathode material A2, cathode material B2It is separate to be 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 the lithium ion battery, which is characterized in that the painting of pole piece in the preparation method Cloth is selected from least one of following manner：
(1) the full wafer coated cathode material on the collector of the cathode sheet；On the collector of the anode pole piece Region coating anode material A corresponding to corner1, the region on the collector of the anode pole piece corresponding to plane layer applies Cover anode material B1；Or
(2) the full wafer coated anode material on the collector of the anode pole piece；On the collector of the cathode sheet Region coating cathode material A corresponding to corner2, the corresponding region in plane layer place on the collector of the cathode sheet Coated cathode material B2；Or
(3) the region coating anode material A on the collector of the anode pole piece corresponding to corner1, in the sun Region coating anode material B on the collector of pole pole piece corresponding to plane layer1；The turning on the collector of the cathode sheet The corresponding region coating cathode material A in place2, the corresponding region coating in plane layer place on the collector of the cathode sheet Cathode material B2；Or
(4) the full wafer coated cathode material on the collector of the cathode sheet, and the cathode sheet is at the turning The coating weight at place is less than the coating weight at the plane layer；On the collector of the anode pole piece corresponding to corner Region coating anode material A1, the region coating anode material B on the collector of the anode pole piece corresponding to plane layer1；Or
(5) the full wafer coated anode material on the collector of the anode pole piece, and the anode pole piece is at the turning The coating weight at place is more than the coating weight at the plane layer；On the collector of the cathode sheet corresponding to corner Region coating cathode material A2, the corresponding region coating cathode material B in plane layer place on the collector of the cathode sheet2； Or
(6) the region coating anode material A on the collector of the anode pole piece corresponding to corner1, in the sun Region coating anode material B on the collector of pole pole piece corresponding to plane layer1, and the anode pole piece is in the corner Coating weight is more than the coating weight at the plane layer；Region on the collector of the cathode sheet corresponding to corner Coated cathode materials A2, the corresponding region coating cathode material B in plane layer place on the collector of the cathode sheet2；Or
(7) the region coating anode material A on the collector of the anode pole piece corresponding to corner1, in the sun Region coating anode material B on the collector of pole pole piece corresponding to plane layer1；The turning on the collector of the cathode sheet The corresponding region coating cathode material A in place2, the corresponding region coating in plane layer place on the collector of the cathode sheet Cathode material B2, and the cathode sheet is less than the coating weight at the plane layer in the coating weight of the corner； Or
(8) the region coating anode material A on the collector of the anode pole piece corresponding to corner1, in the sun Region coating anode material B on the collector of pole pole piece corresponding to plane layer1, and the anode pole piece is in the corner Coating weight is more than the coating weight at the plane layer；Region on the collector of the cathode sheet corresponding to corner Coated cathode materials A2, the corresponding region coating cathode material B in plane layer place on the collector of the cathode sheet2, and institute It states cathode sheet and is less than the coating weight at the plane layer in the coating weight of the corner.
The technical solution of the application at least has following beneficial effect：
The application makes at battery corner regional peace face region especially by being coated with different materials on a current collector It is the higher positive and negative anodes capacity ratio of region holding of battery inner ring cathode packet anode, improves battery corner interface performance, solve The problem of lithium, is analysed by corner, improves the low temperature performance of battery and improves circulating battery analysis lithium.
The application is coated by using different materials, and corner region uses the anode material or low of high gram volume The cathode material of gram volume, be conducive to be especially in cathode sheet corner's cathode packet anode interface go out more preferable embedded lithium from Son, the gram volume for improving the cathode of battery play, and improve the energy density of battery.
Description of the drawings：
Fig. 1 is the schematic cross-section of the uniform 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 uniform 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 uniform coating of anode pole piece；
Wherein：
1- cathode sheets；
11- cathode diaphragms；
12- cathode current collectors；
13- corners cathode diaphragm；
Cathode diaphragm at 14- plane layers；
15- cathode tabs；
2- anode pole pieces；
21- anode diaphragms；
22- anode collectors；
Anode diaphragm at 23- plane layers；
24- corners anode diaphragm；
25- anode lugs；
3- diaphragms；
4- is located at the anode package cathode diaphragm area of battery corner；
5- is located at the cathode package anode diaphragm area of battery corner.
In order to make present invention purpose, technical solution and advantageous effects be more clear, below in conjunction with attached drawing and The application is described in detail in specific implementation mode.It should be understood that specific implementation mode described in this specification is only Merely to explaining the application, it is not intended to limit the application.
Specific implementation mode
This application involves a kind of lithium ion batteries, including by cathode sheet, anode pole piece, be set to cathode sheet and anode Flat battery core made of membrane winding between pole piece,
Wherein, cathode sheet includes cathode current collector and the cathode diaphragm coated on cathode current collector both sides, anode pole piece Anode diaphragm including anode collector and coated on anode collector both sides；
Anode pole piece is coated with anode material A in the corner of battery core1, anode material is coated at the plane layer of battery core 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, the moon is coated at the plane layer of battery core Pole material B2, cathode material A2Gram volume<Cathode material B2Gram volume.
Wherein, it is boundary that plane layer and corner, which are by the flat battery point that circular arc tangential line slope is 0 around the corner, Line.
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 differed It is small, if gram volume difference is too small, the improvement unobvious of lithium are analysed to corner.Have big difference, battery cost is caused 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 differed It is small, the improvement unobvious of lithium are analysed to corner.Have big difference, battery capacity can be influenced, greatly reduces the energy density of battery.
As a kind of improvement of the application lithium ion battery, anode material B1Gram volume be 300~400mAh/g, anode Materials 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 Expect B2Gram volume be 141~330mAh/g.
As a kind of improvement of the application lithium ion battery, the coating weight of cathode sheet around the corner is less than at plane layer Coating weight.
As a kind of improvement of the application lithium ion battery, the coating weight of anode pole piece around the corner is more than at plane layer Coating weight.
Wherein,
Solid content × cathodic coating of battery capacity=cathode coating weight × cathode gram volume × cathode diaphragm active material Piece area
Therefore, coating weight is, according to the gram volume of anode and cathode material, to be coated with different negative and positive in making cell process Pole coating weight can play different battery capacities, can mainly be controlled by the thickness of coating.
As a kind of improvement of the application lithium ion battery, coating weight is coated with cathode sheet at plane layer around the corner The difference of weight is 0.1~1.5mg/cm2；If cathode sheet coating weight difference is too small, the improvement of lithium is analysed not to corner Obviously.Have big difference, battery capacity can be influenced, greatly reduces the energy density of battery.
As a kind of improvement of the application lithium ion battery, coating weight is coated with anode pole piece at plane layer around the corner The difference of weight is 0.1~1.5mg/cm2.It is right if gram volume difference is too small if anode pole piece coating weight difference is too small The improvement unobvious of lithium are analysed by corner.Have big difference, battery capacity can be influenced.
As a kind of improvement of the application lithium ion battery, anode material A1, anode material B1It is separate to be respectively selected from Natural graphite, artificial graphite, soft carbon, hard carbon, mesocarbon microspheres, tin-based oxide, Sn-polymetallic orefield, silicon-carbon alloy and At least one of lithium titanate.
Wherein, A1、B1Any of the above material can be selected, it is only necessary to meet A1Gram volume>B1Gram volume；Specifically, A1 Optional silicon-carbon alloy and tinbase meet one kind in oxidation, B1One kind in artificial graphite and soft carbon can be selected.
As a kind of improvement of the application lithium ion battery, cathode material A2, cathode material B2It is separate to be respectively selected from LiCoO2、LiNiO2、LiMnO2、LiFePO4、LixNiyCozMnO2At least one, 0<x<1,0<y<1,0<z<1.
Wherein, A2、B2Any of the above material can be selected, it is only necessary to meet A2Gram volume<B2Gram volume；Specifically, A2LiCoO can be selected2、LiNiO2、LiMnO2In one kind, B2LiFePO can be selected4、LixNiyCozMnO2In one kind.
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 A1The length of institute's dispensing area is 1~30mm； And/or cathode pole materials A2The length of institute's dispensing area is 1~30mm.
As a kind of improvement of the application lithium ion battery, anode material A1Institute's dispensing area and anode material B1It is coated with Gap between region is 0~2mm；And/or cathode material A2Institute's dispensing area and anode material B2Between institute's dispensing area Gap is 0~2mm.Technique optimum condition is seamless coating, and reduces the gap between two applying areas to the greatest extent, to avoid energy The loss of density.
A kind of improvement of lithium ion battery as the application, the lithium ion battery further include cathode tab and anode pole The position of ear, cathode and the setting of anode lug has：Be respectively positioned on battery inner ring, be respectively positioned on battery outer ring, cathode tab is located at battery Inner ring and anode lug are located at battery outer ring, cathode tab is located at battery outer ring and anode lug is located at battery inner ring.
A kind of improvement of lithium ion battery as the application, anode and cathode lug thickness are 0.05~0.5mm.
A kind of improvement of lithium ion battery as the application, anode and cathode afflux body thickness are 0.004~0.05mm.
The thickness of a kind of improvement of lithium ion battery as the application, isolation film is 0.004~0.05mm.
The application further relates to the preparation method of the lithium ion battery, includes coating, the drying of pole piece, is cold-pressed, soldering polar ear, Fluid injection is packaged after being wound with isolation film, wherein the coating method of pole piece is selected from：
(1) the full wafer coated cathode material on the collector of cathode sheet；The turning place on the collector of anode pole piece Corresponding region coating anode material A1, the region coating anode material B on the collector of anode pole piece corresponding to plane layer1； Or
(2) the full wafer coated anode material on the collector of anode pole piece；The turning place on the collector of cathode sheet Corresponding region coating cathode material A2, the corresponding region coating cathode material in plane layer place on the collector of cathode sheet B2；Or
(3) the region coating anode material A on the collector of anode pole piece corresponding to corner1, in anode pole piece Region coating anode material B on collector corresponding to plane layer1；Area on the collector of cathode sheet corresponding to corner Domain coated cathode materials A2, the corresponding region coating cathode material B in plane layer place on the collector of cathode sheet2；Or
(4) the full wafer coated cathode material on the collector of cathode sheet, and the coating weight of cathode sheet around the corner Less than the coating weight at plane layer；Region coating anode material A on the collector of anode pole piece corresponding to corner1, Region coating anode material B on the collector of anode pole piece corresponding to plane layer1；Or
(5) the full wafer coated anode material on the collector of anode pole piece, and the coating weight of institute's anode pole piece around the corner Amount is more than the coating weight at plane layer；Region coating cathode material on the collector of cathode sheet corresponding to corner A2, the corresponding region coating cathode material B in plane layer place on the collector of cathode sheet2；Or
(6) the region coating anode material A on the collector of anode pole piece corresponding to corner1, in anode pole piece Region coating anode material B on collector corresponding to plane layer1, and the coating weight of anode pole piece around the corner is more than plane Coating weight at layer；Region coating cathode material A on the collector of cathode sheet corresponding to corner2, in cathode pole The corresponding region coating cathode material B in plane layer place on the collector of piece2；Or
(7) the region coating anode material A on the collector of anode pole piece corresponding to corner1, in anode pole piece Region coating anode material B on collector corresponding to plane layer1；Area on the collector of cathode sheet corresponding to corner Domain coated cathode materials A2, the corresponding region coating cathode material B in plane layer place on the collector of cathode sheet2, and cathode Pole piece is less than the coating weight at plane layer in the coating weight of the corner；Or
(8) the region coating anode material A on the collector of anode pole piece corresponding to corner1, in anode pole piece Region coating anode material B on collector corresponding to plane layer1, and the coating weight of anode pole piece around the corner is more than plane Coating weight at layer；Region coating cathode material A on the collector of cathode sheet corresponding to corner2, in cathode pole The corresponding region coating cathode material B in plane layer place on the collector of piece2, and cathode sheet is in the coating weight of the corner Amount is less than the coating weight at plane layer.
In this application, the active material for being coated with same gram volume on a current collector is uniform coating.Exist on a current collector Corner or plane layer place corresponding region first coat a kind of active material of gram volume, form strip distribution on a current collector, Then the active material of remaining region coating another kind gram volume, this coating method are coated with for gap again.
Equally, the mode that gap coating can also be used is coated with the slurry of different coating weights.
Preparation example
The preparation of cathode sheet 1：
1, uniform coating：The schematic cross-section of cathode sheet coating is as shown in Figure 1, by the slurry of the cathode material stirred evenly Material is by forming cathode diaphragm 11 in 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 shown in Fig. 2, will stir evenly Cathode material A2Slurry be coated in the region on collector 12 corresponding to corner, form diaphragm 13, the moon that will be stirred evenly Pole material B2Slurry be coated in collector 12 on the corresponding region in plane layer place, formed diaphragm 14；After forming gap coating Cathode sheet 1；
3, the gap coating of different weight：The slurry of the cathode material stirred evenly is coated on collector 12, and cloudy The coating weight of pole pole piece around the corner is less than the coating weight at plane layer；
The preparation of anode pole piece 2：
1, the gap coating of different gram volumes：The sectional view of anode pole piece coating is as shown in figure 3, the anode that will be stirred evenly Material B1Slurry be applied to the region in anode collector 22 corresponding to plane layer, form anode diaphragm 23, will stir evenly Anode material A1Slurry be applied to the region in anode collector 22 corresponding to corner, form anode diaphragm 24, formed Anode pole piece 2 after the coating of gap；
2, the gap coating of different weight：The slurry of the anode material stirred evenly is applied in anode collector 22, And the coating weight of anode pole piece around the corner is more than the coating weight at plane layer；
3, uniform coating：The sectional view of anode pole piece coating is as shown in figure 4, the slurry of the anode material stirred evenly is led to It crosses and forms anode diaphragm 21 in transfer coated to anode collector 22.
The preparation of battery core：
Wide 5mm is welded on the cathode current collector 12 of innermost circle before welding, the aluminium flake of thickness 0.1mm is as cathode tab 15, it is welded with wide 5mm in innermost circle anode collector 22, the nickel sheet that thickness is 0.1 is used as anode lug 25, when winding beginning, Anode and cathode lug is all located in the inner ring structure of battery core.Lithium ion battery by cathode sheet 1, isolation film 3 and anode pole piece 2 successively It is wound in the same direction after stacking.Battery core after the completion of winding is packaged rear fluid injection with aluminum plastic film and is melted into, and is cut off Become finished product battery core after airbag molding.
Wherein, the winding-structure schematic diagram after the coating of 1 gap of cathode sheet, 2 uniform coating of anode pole piece is as shown in Figure 5.
Embodiment 1
The present embodiment is related to a kind of lithium ion battery, including cathode sheet and anode pole piece.
According to the preparation method of above-mentioned preparation example, cathode sheet and anode pole piece as shown in Table 1 are prepared, and be prepared into electricity Core.
Table 1：Anode and cathode pole coating gram volume
According to the preparation method of above-mentioned preparation example, cathode sheet and anode pole piece as shown in Table 2 are prepared, and be prepared into electricity Core.
Table 2：Anode and cathode pole coating gram volume and weight
Experimental example
(1) lithium phenomenon is analysed
10 progress loop tests are respectively chosen from the battery of Examples 1 to 5 and comparative example 1~2 respectively, are recycled 100 times Afterwards, battery, the analysis lithium situation of observation anode pole piece corner 4 and corner 5 are disassembled, the battery of analysis lithium occurs for statistics anode pole piece Quantity, acquired results are shown in Table 3.
Table 3：Analyse lithium phenomenon testing result
(2) capacity and volume energy density
Volume test and volume energy density test, gained are carried out to the battery that Examples 1 to 5 and comparative example 1~2 provide As a result it is shown in table 4.
Wherein, volume test is tested under 25 DEG C of environment, and what capacity took is 0.2C discharge capacities, volume energy density=appearance Amount × 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
10 progress cycle performance tests are respectively chosen from the battery of Examples 1 to 5 and comparative example 1~2 respectively：
Test condition is：0.7C constant-current charges are to 4.35V at 45 DEG C, at 4.35V constant-voltage charge to 0.05C, then 1.0C constant-current discharges record initial capacity, and repeat above step 500 times to 3.0V, are discharged to 0.2C after every 50 cycles The capacity of 3.0V.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
From table 4 and table 5 it is found that compared with the battery prepared using conventional coating processes, the lithium battery of the application passes through It is coated with the anode material and/or negative-type of different gram volumes, the energy density of battery can be improved, and by 500 cycles Battery core still has higher capacity retention ratio afterwards.
Being described in detail the application, the application those skilled in the art can also be to above-mentioned implementations above Mode is changed and is changed.Therefore, the application is not limited to specific implementation mode disclosed and described above, to the application Some modifications and changes should also be as falling into the protection domain of claims hereof.In addition, although making in this specification With some specific terms, these terms are merely for convenience of description, does not constitute any restrictions to the application.

Claims (11)

1. a kind of lithium ion battery, including by cathode sheet, anode pole piece and it is set to the cathode sheet and the anode pole Flat battery core made of membrane winding between piece, which is characterized in that the anode pole piece is applied in the corner of the battery core It is covered with anode material A1, anode material B is coated at the plane layer of the battery core1, the anode material A1Gram volume be higher than The anode material B1；And/or the cathode sheet is coated with cathode material A in the corner of the battery core2, in the battery core Plane layer at be coated with cathode material B2, the cathode material A2Gram volume be less than the cathode material B2。
2. lithium ion battery according to claim 1, which is characterized in that the anode material A1Gram volume than the sun Pole material B1The high 1~100mAh/g of gram volume.
3. lithium ion battery according to claim 1, which is characterized in that the cathode material A2Gram volume than described the moon Pole material B2The low 1~100mAh/g of gram volume.
4. lithium ion battery according to claim 1, which is characterized in that the anode material B1Gram volume be 300~ 400mAh/g, the anode material A1Gram volume be 301~500mAh/g.
5. lithium ion battery according to claim 1, which is characterized in that the cathode material A2Gram volume be 140~ 230mAh/g, the cathode material B2Gram volume be 141~330mAh/g.
6. lithium ion battery according to claim 1, which is characterized in that coating of the cathode sheet in the corner Weight is less than the coating weight at the plane layer.
7. lithium ion battery according to claim 1, which is characterized in that coating of the anode pole piece in the corner Weight is more than the coating weight at the plane layer.
8. lithium ion battery according to claim 1, which is characterized in that the anode material A1The length of institute's dispensing area For 1~30mm；And/or the cathode material A2The length of institute's dispensing area is 1~30mm.
9. lithium ion battery according to claim 1, which is characterized in that the anode material A1Institute's dispensing area with it is described Anode material B1Gap between institute's dispensing area is 0~2mm；And/or the cathode material A2Institute's dispensing area and the sun Pole material B2Gap between institute's dispensing area is 0~2mm.
10. lithium ion battery according to claim 1, which is characterized in that the anode material A1, anode material B1Respectively It is independent to be respectively selected from natural graphite, artificial graphite, soft carbon, hard carbon, mesocarbon microspheres, tin-based oxide, tinbase composite oxygen At least one of compound, silicon-carbon alloy and lithium titanate；And/or the cathode material A2, cathode material B2Separate point It Xuan Zi not LiCoO2、LiNiO2、LiMnO2、LiFePO4、LixNiyCozMnO2At least one, 0<x<1,0<y<1,0<z<1.
11. a kind of preparation method of the lithium ion battery as described in any claim as described in claim 1~10, feature exist In the coating of pole piece is selected from least one of following manner in the preparation method：
(1) the full wafer coated cathode material on the collector of the cathode sheet；The turning on the collector of the anode pole piece The corresponding region coating anode material A in place1, the region coating sun on the collector of the anode pole piece corresponding to plane layer Pole material B1；Or
(2) the full wafer coated anode material on the collector of the anode pole piece；The turning on the collector of the cathode sheet The corresponding region coating cathode material A in place2, the corresponding region coating in plane layer place on the collector of the cathode sheet Cathode material B2；Or
(3) the region coating anode material A on the collector of the anode pole piece corresponding to corner1, in the anode pole piece Collector on region coating anode material B corresponding to plane layer1；Institute is right at turning on the collector of the cathode sheet The region coating cathode material A answered2, the corresponding region coating cathode material in plane layer place on the collector of the cathode sheet Expect B2；Or
(4) the full wafer coated cathode material on the collector of the cathode sheet, and the cathode sheet is in the corner Coating weight is less than the coating weight at the plane layer；Region on the collector of the anode pole piece corresponding to corner Coated anode materials A1, the region coating anode material B on the collector of the anode pole piece corresponding to plane layer1；Or
(5) the full wafer coated anode material on the collector of the anode pole piece, and the anode pole piece is in the corner Coating weight is more than the coating weight at the plane layer；Region on the collector of the cathode sheet corresponding to corner Coated cathode materials A2, the corresponding region coating cathode material B in plane layer place on the collector of the cathode sheet2；Or
(6) the region coating anode material A on the collector of the anode pole piece corresponding to corner1, in the anode pole piece Collector on region coating anode material B corresponding to plane layer1, and the anode pole piece is in the coating weight of the corner Amount is more than the coating weight at the plane layer；Region coating on the collector of the cathode sheet corresponding to corner is cloudy Pole materials A2, the corresponding region coating cathode material B in plane layer place on the collector of the cathode sheet2；Or
(7) the region coating anode material A on the collector of the anode pole piece corresponding to corner1, in the anode pole piece Collector on region coating anode material B corresponding to plane layer1；Institute is right at turning on the collector of the cathode sheet The region coating cathode material A answered2, the corresponding region coating cathode material in plane layer place on the collector of the cathode sheet Expect B2, and the cathode sheet is less than the coating weight at the plane layer in the coating weight of the corner；Or
(8) the region coating anode material A on the collector of the anode pole piece corresponding to corner1, in the anode pole piece Collector on region coating anode material B corresponding to plane layer1, and the anode pole piece is in the coating weight of the corner Amount is more than the coating weight at the plane layer；Region coating on the collector of the cathode sheet corresponding to corner is cloudy Pole materials A2, the corresponding region coating cathode material B in plane layer place on the collector of the cathode sheet2, and the cathode Pole piece is less than the coating weight at the plane layer in the coating weight of the corner.
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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
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