CN109509867A - 一种锂离子电池极片 - Google Patents
一种锂离子电池极片 Download PDFInfo
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- CN109509867A CN109509867A CN201811635079.XA CN201811635079A CN109509867A CN 109509867 A CN109509867 A CN 109509867A CN 201811635079 A CN201811635079 A CN 201811635079A CN 109509867 A CN109509867 A CN 109509867A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 13
- 238000000576 coating method Methods 0.000 claims abstract description 19
- 238000001035 drying Methods 0.000 claims abstract description 10
- 239000011149 active material Substances 0.000 claims abstract description 5
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 4
- 238000004513 sizing Methods 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims description 15
- 238000004804 winding Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 abstract description 8
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052744 lithium Inorganic materials 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000003792 electrolyte Substances 0.000 description 6
- 239000002002 slurry Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000005213 imbibition Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
本发明涉及一种锂离子电池极片,在极片的涂布过程中，涂布正极浆料附着在集流体上的活性物质厚薄互相间隔的波浪型，再经烘干收卷，通过连轧机进压薄，即可以得到内部高孔隙率和低空隙率间隔出现的极片。所述波浪型尺寸：厚处尺寸为A，薄处尺寸为B，(A‑B)/B=10‑30%,厚薄间隔C，C=3‑6mm。碾压后厚度变成一致，涂层内部颗粒数量不一致呈现出高、低空隙率间隔有规律变化，该极片制作的电池在充放电时，由于低空隙率颗粒的存在，使锂离子的导通速率得到很大的提升，从而可以使锂电池在不降的能量密度的情况下，高倍率充放电性能得到很大提升。
Description
技术领域
本发明涉及锂离子电池领域，具体涉及一种锂离子电池极片。
背景技术
目前锂离子电池的正负极极片均按照单一的厚度进行覆料，在极片烘干后进行碾压的过程中，尤其在较大的压力下容易使极片出现过压情况，具体表现在极片内部空隙率过低，从而导致出现烘烤后极卷绕时出现极片断裂，电解液浸润变差等异常，使制作的锂电池大电流充放电性能及安全性降低。
发明内容
本发明提供一种锂离子电池极片的设计方法，通过提供一种内部颗粒间空隙率按照一定规律变化的极片，可以在不降低锂电池能量密度的情况下不仅能够避免锂离子极片在碾压时出现过压从而导致极片变脆易折断的问题，且能够大大加快极片在注液时的吸液速度，提升注液效率，同时能够提升极片在电解液中的浸润效果，提升电池的放电倍率性能。
为了实现以上效果，本发明采用以下的极片设计：一种锂离子电池极片,其特征在于：在极片的涂布过程中，涂布正极浆料附着在集流体上的活性物质厚薄互相间隔的波浪型涂层，再经烘干收卷，通过连轧机进压薄，即可以得到内部高孔隙率和低空隙率间隔出现的极片。
进一步地，所述波浪型尺寸：厚处尺寸为A，薄处尺寸为B，(A-B)/B=10-30%,
厚薄间隔C，C=3-6mm。
本发明将浆料涂布时转移浆料的模头按照波浪型进行设计，在一定的压力作用下，可以使浆料溢出及转移至箔材上活性物质厚薄互相间隔的波浪型涂层，再经烘干收卷，通过连轧机进压薄，即可以得到内部高孔隙率和低空隙率间隔出现的极片。其中波浪型尺寸：厚处尺寸为A，薄处尺寸为B，(A-B)/B=10-30%,厚薄间隔C，C=3-6mm。浆料转移到箔材上后经过烘干，波浪型涂层其内部各固体颗粒间的间隙基本一致，厚度变化与涂布后的极片厚度变化一致，烘干后的极片经过连轧机碾压后，厚度变成一致，但是由于极片涂层内部颗粒数量不一致，内部颗粒间的间隙则会呈现出高孔隙率和低空隙率间隔出现有规律的变化。极片卷绕成卷芯，注入电解液后，在高孔隙率区域，电解液渗透加快，同时会使低空隙率颗粒周围填充满电解液，最终加快电芯中电解液的渗液速率，同时极片的保液量也得到很大的提升。采用该极片制作的电池在充放电时，由于低空隙率颗粒的存在，使锂离子的导通速率得到很大的提升，从而可以使锂电池在不降的能量密度的情况下，高倍率充放电性能得到很大提升。
附图说明
图1为本发明极片涂布涂层结构示意图；
图2为图1极片涂层烘干后的内部颗粒示意图；
图3为图2极片涂布烘干碾压后的内部结构示意图；
图4为本发明极片制作电池的常温循环曲线图。
图中：集流体1、涂层2、厚区E、薄区F、低空隙率区I、高空隙率区H。
具体实施方式
以下结合附图和实施例对本发明作进一步说明。
图1、2、3所示，一种锂离子电池极片,在极片的涂布过程中，涂布正极浆料附着在集流体1上的活性物质厚区E、薄区F互相间隔的波浪型涂层2，再经烘干收卷，通过连轧机进压薄，即可以得到内部高孔隙率区H和低空隙率区I间隔出现的极片，波浪型尺寸：厚处尺寸为A，薄处尺寸为B，(A-B)/B=10-30%,厚薄间隔C，C=3-6mm。
采用上述电池极片制作三元材料的锂电池时，其中A、B的差值为20μm，间距C为3mm,辊压后对应区域的压实密度分别为2.95 g/cm3和3.5 g/ cm3。将方案一：本发明的极片，与方案二：均一厚度涂层极片，压实密度均为3.25 g/cm3的极片按照正常工艺制作电池。结果表明方案一极片在电解液渗液时间上提升了20%，制作的电池在1C充电10C放电循环性能较方案二提升50%以上（如图4）。
Claims (1)
1.一种锂离子电池极片,其特征在于：在极片的涂布过程中，涂布正极浆料附着在集流体上的活性物质厚薄互相间隔的波浪型，再经烘干收卷，通过连轧机进压薄，即可以得到内部高孔隙率和低空隙率间隔出现的极片；所述波浪型尺寸：厚处尺寸为A，薄处尺寸为B，(A-B)/B=10-30%,厚薄间隔C，C=3-6mm。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115692603A (zh) * | 2022-11-21 | 2023-02-03 | 楚能新能源股份有限公司 | 极片及其制备方法和锂离子电池 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130323555A1 (en) * | 2012-06-04 | 2013-12-05 | Hitachi, Ltd. | Lithium-ion rechargeable battery anode, lithium-ion rechargeable battery utilizing the lithium-ion rechargeable battery anode, and manufacturing method thereof |
| JP2016058247A (ja) * | 2014-09-10 | 2016-04-21 | 凸版印刷株式会社 | リチウムイオン二次電池用電極及びリチウムイオン二次電池 |
| CN106531961A (zh) * | 2017-01-13 | 2017-03-22 | 欣旺达电子股份有限公司 | 锂离子电池电极极片、极片辊压装置及锂离子电池 |
| CN106688127A (zh) * | 2014-09-10 | 2017-05-17 | 三菱综合材料株式会社 | 锂离子二次电池用正极及锂离子二次电池 |
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2018
- 2018-12-29 CN CN201811635079.XA patent/CN109509867A/zh active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130323555A1 (en) * | 2012-06-04 | 2013-12-05 | Hitachi, Ltd. | Lithium-ion rechargeable battery anode, lithium-ion rechargeable battery utilizing the lithium-ion rechargeable battery anode, and manufacturing method thereof |
| JP2016058247A (ja) * | 2014-09-10 | 2016-04-21 | 凸版印刷株式会社 | リチウムイオン二次電池用電極及びリチウムイオン二次電池 |
| CN106688127A (zh) * | 2014-09-10 | 2017-05-17 | 三菱综合材料株式会社 | 锂离子二次电池用正极及锂离子二次电池 |
| CN106531961A (zh) * | 2017-01-13 | 2017-03-22 | 欣旺达电子股份有限公司 | 锂离子电池电极极片、极片辊压装置及锂离子电池 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115692603A (zh) * | 2022-11-21 | 2023-02-03 | 楚能新能源股份有限公司 | 极片及其制备方法和锂离子电池 |
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