WO2021238537A1 - 一种阳极极片及其制备方法、锂离子电池 - Google Patents

一种阳极极片及其制备方法、锂离子电池 Download PDF

Info

Publication number
WO2021238537A1
WO2021238537A1 PCT/CN2021/089568 CN2021089568W WO2021238537A1 WO 2021238537 A1 WO2021238537 A1 WO 2021238537A1 CN 2021089568 W CN2021089568 W CN 2021089568W WO 2021238537 A1 WO2021238537 A1 WO 2021238537A1
Authority
WO
WIPO (PCT)
Prior art keywords
anode
tab
electrode piece
support layer
anode electrode
Prior art date
Application number
PCT/CN2021/089568
Other languages
English (en)
French (fr)
Inventor
朱建平
魏建良
韦凯
卢军太
叶茂鹏
Original Assignee
东莞塔菲尔新能源科技有限公司
江苏塔菲尔新能源科技股份有限公司
江苏塔菲尔动力系统有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 东莞塔菲尔新能源科技有限公司, 江苏塔菲尔新能源科技股份有限公司, 江苏塔菲尔动力系统有限公司 filed Critical 东莞塔菲尔新能源科技有限公司
Publication of WO2021238537A1 publication Critical patent/WO2021238537A1/zh

Links

Images

Classifications

    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • 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
    • 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
    • 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

Definitions

  • the invention belongs to the technical field, and particularly relates to an anode pole piece and a preparation method thereof, and a lithium ion battery.
  • Lithium-ion batteries have been widely used in various fields due to their advantages such as high voltage, high energy density, high cycle life, low self-discharge rate, light weight and no memory effect. With the continuous improvement of the requirements for the capacity of lithium-ion batteries by electrical equipment, people's expectations for the improvement of the energy density of lithium-ion batteries are getting higher and higher.
  • One of the objectives of the present invention is to provide an anode pole piece in view of the shortcomings of the prior art, which enhances the support strength of the tab, and improves the problems such as collapse, damage, and folding of the tab.
  • An anode pole piece characterized in that it comprises:
  • the current collector is provided with a diaphragm coating on at least one side;
  • the tab is electrically connected with the current collector, and at least one surface of the tab is provided with a support layer connected with the diaphragm coating.
  • the width of the support layer is 5 to 80% of the length of the tab, and the thickness of the support layer is 3 to the thickness of the film coating. 100%.
  • the width of the support layer is constant, the greater the thickness of the support layer, the more the center of gravity of the tab will move to the head of the tab, thereby providing a better support.
  • the width and thickness of the support layer do not need to be too large, so as not to waste materials and affect the performance of the tabs.
  • the support layer is formed by coating and drying a support slurry containing an adhesive.
  • the adhesive is an aqueous adhesive or an aqueous solution of an aqueous adhesive that is incompatible with the membrane coating. Since the anode slurry used to form the membrane coating is generally water-based, the support layer adopts a support slurry containing a water-based binder to prevent the two from dissolving each other, which affects the support strength of the support layer and the thickness of the anode electrode. performance.
  • the water-based adhesive includes at least one of sodium carboxymethyl cellulose, polyacrylonitrile, polyvinylpyrrolidone and acrylic resin.
  • the water-based adhesive includes, but is not limited to, the substances listed above, as long as it meets the condition of not being miscible with the anode slurry.
  • the supporting slurry further includes at least one of carbon powder, metal oxide and conductive carbon.
  • the support layer is also added with at least one of the above substances, which can increase the solid content and make subsequent drying easier; it can further increase the strength of the support layer; it can also change the color of the support layer to make the support layer and the membrane coating Easier to distinguish.
  • the end of the support layer away from the membrane coating is arranged in a linear, zigzag or wavy shape.
  • the anode pole piece of the present invention also includes a reinforced indentation, the reinforced indentation is provided in the blank area of the tab, or the reinforced indentation is provided in the blank area of the tab And the area where the support layer is located. Strengthening the indentation can further enhance the strength of the tabs, so that during the battery production process, the tabs will not be curled, folded, or torn due to collisions.
  • the tabs are provided with N tabs, N ⁇ 2, and the N tabs are located on the same side or on both sides of the current collector.
  • the second objective of the present invention is to provide a method for preparing an anode pole piece, which includes the following steps:
  • the current collector is electrically connected with a tab, at least one surface of the current collector is coated with anode slurry, and at least one surface of the tab is coated with a supporting slurry, the anode slurry and the The supporting slurries are incompatible with each other;
  • the anode pole piece is rolled to form a reinforced indentation on the surface of the blank area of the tab, or a reinforced indentation is formed on the surface of the blank area of the tab and the surface of the support layer.
  • the third objective of the present invention is to provide a lithium-ion battery, comprising an anode electrode piece, a cathode electrode piece, a diaphragm spaced between the anode electrode piece and the cathode electrode piece, and an electrolyte, the anode electrode
  • the sheet is the anode electrode sheet described in any preceding paragraph of the specification.
  • the present invention has at least the following beneficial effects:
  • the present invention provides an anode pole piece.
  • a support layer is provided on the surface of the lug to enhance the support strength of the lug, reasonably adjust the center of gravity of the lug, and can improve the problem of the lug staying and greatly reduce the occurrence of subsequent production processes. Problems such as broken and folded tabs.
  • the present invention provides a method for preparing anode pole pieces, which adopts the process sequence of coating first and then rolling, that is, when the anode pole piece is rolled, the lug area is provided with a support layer, and this operation can Optimizing the wrinkle in the empty foil area during the rolling process of the traditional anode pole piece can also improve the collapse of the tab and greatly reduce the problems of tab breakage and folding in the subsequent production process.
  • the present invention provides a lithium ion battery, which adopts the anode pole piece of the present invention, and the thickness of the current collector can be set to be thinner to increase the energy density of the lithium ion battery without affecting the production efficiency and product of the pole piece Good rate.
  • FIG. 1 is one of the structural schematic diagrams of Embodiment 1.
  • FIG. 2 is the second structural diagram of Embodiment 1.
  • FIG. 2 is the second structural diagram of Embodiment 1.
  • FIG. 3 is the third structural diagram of Embodiment 1.
  • FIG. 3 is the third structural diagram of Embodiment 1.
  • FIG. 4 is one of the structural schematic diagrams of Embodiment 2.
  • Fig. 5 is the second structural diagram of the second embodiment.
  • Fig. 6 is the third structural diagram of the second embodiment.
  • FIG. 7 is one of the structural schematic diagrams of Embodiment 3.
  • FIG. 8 is the second structural diagram of the third embodiment.
  • this embodiment provides an anode pole piece, including:
  • the current collector 1 is provided with a diaphragm coating 3 on at least one side;
  • the tab 2 is electrically connected to the current collector 1, and at least one surface of the tab 2 is provided with a support layer 4 connected with the diaphragm coating 3.
  • the current collector 1 is a metal foil, preferably a copper foil with a thickness of less than or equal to 6 ⁇ m.
  • the width of the support layer 4 is 40% of the length of the tab 2.
  • the thickness of the support layer 4 is 50% of the thickness of the membrane coating 3.
  • the support layer 4 is obtained by coating and drying a support slurry containing an adhesive
  • the adhesive is an aqueous adhesive or an aqueous solution of an aqueous adhesive that is incompatible with the membrane coating.
  • the viscosity of the aqueous adhesive or the aqueous solution of the aqueous adhesive is 800-4000 mPa ⁇ s, and the solid content is 1-40%.
  • the mass ratio of water-based adhesive to water is (70-100): (0-30).
  • the aqueous adhesive includes at least one of sodium carboxymethyl cellulose, polyacrylonitrile, polyvinylpyrrolidone, and acrylic resin.
  • the supporting slurry further includes at least one of carbon powder, metal oxide, and conductive carbon.
  • the end of the support layer 4 away from the diaphragm coating 3 is set in a linear, zigzag, or wavy shape.
  • the diaphragm coating 3 is obtained by coating and drying the anode slurry.
  • the anode slurry includes 96 parts of anode active material, 1.5 parts of anode conductive agent, 1.5 parts of anode binder and 1 part of dispersant.
  • the anode active material is artificial graphite, natural graphite, silicon-carbon composite material or lithium titanate
  • the anode conductive agent is conductive carbon black, carbon nanotube or graphene
  • the anode binder is styrene butadiene rubber
  • the dispersant is carboxymethyl fiber White.
  • the method for preparing the anode pole piece includes the following steps:
  • One side of the current collector 1 is electrically connected with a tab 2; at least one surface of the collector 1 is coated with anode slurry, and at least one surface of the tab 2 is coated with a supporting slurry.
  • the material and support slurry are not compatible with each other;
  • the anode slurry and the supporting slurry are dried to form the connected diaphragm coating 3 and the supporting layer 4 to obtain the anode pole piece.
  • this embodiment provides an anode pole piece, which is different from Embodiment 1 in:
  • the anode pole piece further includes a reinforced indentation 5, and the reinforced indentation 5 is arranged in the blank area of the tab 2.
  • the method for preparing the anode pole piece includes the following steps:
  • One side of the current collector 1 is electrically connected to a plurality of tabs 2, and at least one surface of the collector 1 is coated with anode slurry, and at least one surface of the tab 2 is coated with supporting slurry.
  • the slurry and the supporting slurry are incompatible with each other;
  • the anode pole piece is rolled to form a reinforced indentation 5 on the surface of the blank area of the tab 2.
  • this embodiment provides an anode pole piece, which differs from Embodiment 1 in:
  • the anode pole piece further includes a reinforced indentation 5, and the reinforced indentation 5 is provided in the blank area of the tab 2 and the area where the support layer 4 is located.
  • the method for preparing the anode pole piece includes the following steps:
  • Both sides of the current collector 1 are electrically connected with a plurality of tabs 2, and at least one surface of the collector 1 is coated with anode slurry, and at least one surface of the tab 2 is coated with support slurry, The anode slurry and the supporting slurry are incompatible with each other;
  • the anode pole piece is rolled to form a strengthening impression 5 on the surface of the blank area of the tab 2 and the surface of the support layer 4.
  • This embodiment provides an anode pole piece, which is different from Embodiment 1 in:
  • the width of the support layer 4 is 5% of the length of the tab 2.
  • This embodiment provides an anode pole piece, which is different from Embodiment 1 in:
  • the width of the support layer 4 is 20% of the length of the tab 2.
  • This embodiment provides an anode pole piece, which is different from Embodiment 1 in:
  • the width of the support layer 4 is 60% of the length of the tab 2.
  • This embodiment provides an anode pole piece, which is different from Embodiment 1 in:
  • the width of the support layer 4 is 80% of the length of the tab 2.
  • This embodiment provides an anode pole piece, which is different from Embodiment 1 in:
  • the thickness of the support layer 4 is 3% of the thickness of the membrane coating 3.
  • This embodiment provides an anode pole piece, which is different from Embodiment 1 in:
  • the thickness of the support layer 4 is 20% of the thickness of the membrane coating 3.
  • This embodiment provides an anode pole piece, which is different from Embodiment 1 in:
  • the thickness of the support layer 4 is 60% of the thickness of the membrane coating 3.
  • This embodiment provides an anode pole piece, which is different from Embodiment 1 in:
  • the thickness of the support layer 4 is 80% of the thickness of the membrane coating 3.
  • This embodiment provides an anode pole piece, which is different from Embodiment 1 in:
  • the thickness of the support layer 4 is 100% of the thickness of the membrane coating 3.
  • a lithium ion battery includes an anode pole piece, a cathode pole piece, a diaphragm arranged at intervals between the anode pole piece and the cathode pole piece, and an electrolyte.
  • the anode pole pieces are the anode pole pieces of Examples 1-12, respectively.
  • the cathode electrode piece includes a cathode current collector and a cathode membrane coating arranged on at least one surface of the cathode current collector.
  • the cathode current collector is preferably aluminum foil.
  • the cathode membrane is obtained by coating and drying the cathode slurry.
  • the cathode slurry includes 96 parts of cathode active material, 2 parts of cathode conductive agent and 2 parts of cathode adhesive.
  • the cathode active material is preferably lithium iron phosphate
  • the cathode conductive agent is preferably conductive carbon
  • the cathode binder is preferably polyvinylidene fluoride.
  • This comparative example provides an anode pole piece, which includes a current collector and a tab electrically connected with the current collector, and at least one surface of the current collector is provided with a diaphragm coating.
  • the current collector is a metal foil, preferably a copper foil with a thickness of less than or equal to 6 ⁇ m.
  • the membrane coating is obtained by coating and drying the anode slurry.
  • the anode slurry includes 96 parts of anode active material, 1.5 parts of anode conductive agent, 1.5 parts of anode binder and 1 part of dispersant.
  • the active material is artificial graphite, natural graphite, silicon-carbon composite material or lithium titanate
  • the anode conductive agent is conductive carbon black, carbon nanotube or graphene
  • the anode binder is styrene butadiene rubber
  • the dispersant is carboxymethyl cellulose.
  • the preparation method of the anode pole piece includes the following steps:
  • the current collector is electrically connected with tabs, and at least one surface of the current collector is coated with anode slurry;
  • the anode slurry is dried to form a film coating to obtain an anode pole piece.
  • This comparative example provides an anode electrode piece.
  • the difference from Example 1 is:
  • the supporting slurry includes an oily adhesive.
  • the oily adhesive is polyvinylidene fluoride.
  • the supporting slurry further includes at least one of carbon powder, metal oxide, and conductive carbon.
  • the method for preparing the anode pole piece includes the following steps:
  • One side of the current collector 1 is electrically connected with a tab 2; at least one surface of the collector 1 is coated with anode slurry, and at least one surface of the tab 2 is coated with a supporting slurry.
  • the material and the supporting slurry are partially soluble in each other, and the supporting slurry part is analyzed;
  • the anode slurry and the supporting slurry are dried to form the membrane coating 3 and the supporting layer 4 to obtain the anode pole piece.
  • Example 2 Example 3
  • Example 4 Example 5
  • Product superiority rate (%) 93 97 99 87 88
  • Example 6 Example 7
  • Example 8 Example 9
  • Example 10 Product superiority rate (%) 90 95 87 89 94
  • Example 11 Example 12 Comparative example 1 Comparative example 2 To Product superiority rate (%) 95 96 78 82 To
  • Example 1 From the comparison of Example 1 and Comparative Example 1, it can be seen that the support layer with oil-based adhesive is significantly inferior to that with water-based adhesive, because the anode slurry is water-based, and the water-based anode slurry and the oil-based support slurry Mutual solubility will occur, and the polyvinylidene fluoride in the support slurry will precipitate out when it meets with water, thereby reducing its support for the tabs.

Abstract

一种阳极极片、其制备方法及锂离子电池。所述阳极极片包括集流体（1），至少一面设置有膜片涂层（3）；极耳（2），与所述集流体（1）电连接，所述极耳（2）的至少一面设置有与所述膜片涂层（3）相连接的支撑层（4）。所述阳极极片结构能够增强极耳（2）的整体支撑强度，改善极耳（2）下塌、破损、翻折等问题，提高电池的安全性。

Description

一种阳极极片及其制备方法、锂离子电池
本申请要求于2020年5月26日提交中国专利局、申请号为202010456523.2、发明名称为“一种阳极极片及其制备方法、锂离子电池”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明属于技术领域，尤其涉及一种阳极极片及其制备方法、锂离子电池。
背景技术
锂离子电池因具有高电压、高能量密度、高循环寿命、低自放电率、重量轻和无记忆效应等优点，在各领域实现了广泛的应用。随着用电设备对锂离子电池容量要求的不断提高，人们对锂离子电池能量密度提升的期望越来越高。
目前，为了电芯内部结构的需要，有的极片其极耳相对较长，极耳重心就会远离极片膜区较多，从而引起极耳头部下塌。不仅如此，为了满足用电设备对电池容量的要求，通常采用较薄的阳极箔材来提高电池能量密度，在阳极箔材较薄的情况下，其模切得到的极耳也会薄，从而支撑作用较弱，更容易出现极耳下塌。除此之外，较长或较薄的极耳，在后续的分条、卷绕等工序中，容易出现褶皱、翻折或破损等问题，极大地影响了自动化生产的效率和优率。
发明内容
本发明的目的之一在于：针对现有技术的不足，而提供一种阳极极片，增强极耳的支撑强度，改善极耳下塌、破损、翻折等问题。
为了实现上述目的，本发明采用以下技术方案：
一种阳极极片，其特征在于，包括：
集流体，至少一面设置有膜片涂层；
极耳，与所述集流体电连接，所述极耳的至少一面设置有与所述膜片涂层相连接的支撑层。
作为本发明所述的阳极极片的一种改进，所述支撑层的宽度为所述极耳长度的5～80％，所述支撑层的厚度为所述膜片涂层的厚度的3～100％。通过调整支撑层的宽度和厚度来改变极耳重心，以达到更好的增强强度作用。支撑层的宽度或厚度过小，对极耳强度的增强效果较差。在支撑层的厚度一定时，支撑层宽度越大，极耳的重心就越往极耳的头部移，从而起到更好的支撑作用。同理，在支撑层的宽度一定时，支撑层厚度越大，极耳的重心就越往极耳的头部移，从而起到更好的支撑作用。当然，支撑层的宽度和厚度也不必过大，以免浪费材料且影响极耳性能。
作为本发明所述的阳极极片的一种改进，所述支撑层由含有粘接剂的支撑浆料经过涂覆干燥形成。
作为本发明所述的阳极极片的一种改进，所述粘接剂为与所述膜片涂层互不相溶的水性粘接剂或水性粘接剂的水溶液。由于用于形成膜片涂层的阳极浆料中一般是水性的，因此，支撑层采用含有水性粘结剂的支撑浆料，能避免两者互溶，影响支撑层的支撑强度和阳极极片的性能。
作为本发明所述的阳极极片的一种改进，所述水性粘接剂包括羧甲基纤维素钠、聚丙烯腈、聚乙烯吡咯烷酮和丙烯酸树脂中的至少一种。水性粘接剂包括但不限于以上列举的物质，只要其满足不与阳极浆料互溶的条件即可。
作为本发明所述的阳极极片的一种改进，所述支撑浆料还包括碳粉、金属氧化物和导电碳中的至少一种。支撑层还添加有以上物质中的至少一种，能提高固含量，使后续较易烘干；还能进一步增加支撑层的强度；也能改变支撑层的颜色，使支撑层与膜片涂层较易区分。
作为本发明所述的阳极极片的一种改进，所述支撑层远离所述膜片涂层的一端设置为直线状、锯齿状或波浪状。
作为本发明所述的阳极极片的一种改进，还包括加强压痕，所述加强压痕设置于所述极耳的空白区，或者所述加强压痕设置于所述极耳的空白 区和所述支撑层所在区域。加强压痕能进一步增强极耳强度，使得在电池生产过程中，极耳不会因为受到碰撞而发生卷曲、翻折和撕裂等。
作为本发明所述的阳极极片的一种改进，所述极耳设置有N个，N≥2，N个所述极耳位于所述集流体的同侧或两侧。
本发明的目的之二在于：提供一种阳极极片的制备方法，包括以下步骤：
取一集流体，所述集流体电连接有极耳，在所述集流体的至少一表面涂覆阳极浆料，在极耳的至少一表面涂覆支撑浆料，所述阳极浆料和所述支撑浆料互不相溶；
烘干所述阳极浆料和所述支撑浆料，形成相连接的膜片涂层和支撑层，得到阳极极片。
作为本发明所述的阳极极片的制备方法的一种改进，还包括以下步骤：
辊压所述阳极极片，在所述极耳的空白区表面形成加强压痕，或者在所述极耳的空白区表面和所述支撑层的表面形成加强压痕。
本发明的目的之三在于：提供一种锂离子电池，包括阳极极片、阴极极片、间隔于所述阳极极片和所述阴极极片之间的隔膜，以及电解液，所述阳极极片为说明书前文任一段所述的阳极极片。
相比于现有技术，本发明至少具有以下有益效果：
1)本发明提供一种阳极极片，在极耳表面设置支撑层，增强极耳的支撑强度，合理调整极耳重心位置，可以改善极耳下榻的问题，极大地减少了后续生产工序中出现的极耳破损、翻折等问题。
2)本发明提供一种阳极极片的制备方法，采用的是先涂覆再辊压的工艺顺序，即在对阳极极片进行辊压时，极耳区是设置有支撑层，如此操作能优化传统阳极极片辊压过程中出现的空箔区打皱现象，也可以改善极耳下塌，极大地减少后续生产工序中出现的极耳破损，翻折等问题。
3)本发明提供一种锂离子电池，其采用本发明的阳极极片，可以将集流体的厚度设置得较薄以提高锂离子电池的能量密度，且不会影响极片的生产效率和产品优率。
附图说明
图1是实施例1的结构示意图之一。
图2是实施例1的结构示意图之二。
图3是实施例1的结构示意图之三。
图4是实施例2的结构示意图之一。
图5是实施例2的结构示意图之二。
图6是实施例2的结构示意图之三。
图7是实施例3的结构示意图之一。
图8是实施例3的结构示意图之二。
图9是实施例3的结构示意图之三。
其中：1-集流体，2-极耳，3-膜片涂层，4-支撑层，5-加强压痕。
具体实施方式
下面结合具体实施方式和说明书附图，对本发明作进一步详细的描述，但本发明的实施方式并不限于此。
参考图1～3，本实施例提供一种阳极极片，包括：
集流体1，至少一面设置有膜片涂层3；
极耳2，与集流体1电连接，极耳2的至少一面设置有与膜片涂层3相连接的支撑层4。
具体的，集流体1为金属箔，优选为厚度小于或等于6μm的铜箔。
在本实施例中，支撑层4的宽度为极耳2长度的40％。
在本实施例中，支撑层4的厚度为膜片涂层3的厚度的50％。
在本实施例中，支撑层4由含有粘接剂的支撑浆料涂覆烘干而得，粘接剂为与膜片涂层互不相溶的水性粘接剂或水性粘接剂的水溶液。具体的，水性粘接剂或水性粘接剂的水溶液的粘度为800～4000mPa·s，固含量为1～40％。水性粘接剂与水的质量比为(70～100):(0～30)。具体的，水性粘接剂包括羧甲基纤维素钠、聚丙烯腈、聚乙烯吡咯烷酮和丙烯酸树脂中的至少一种。
在本实施例中，支撑浆料还包括碳粉、金属氧化物和导电碳中的至少 一种。
在本实施例中，支撑层4远离膜片涂层3的一端设置为直线状、锯齿状或波浪状。
在本实施例中，膜片涂层3由阳极浆料涂覆烘干而得，阳极浆料包括96份阳极活性物质、1.5份阳极导电剂、1.5份阳极粘接剂和1份分散剂，阳极活性物质为人造石墨、天然石墨、硅碳复合材料或钛酸锂，阳极导电剂为导电炭黑、碳纳米管或石墨烯，阳极粘接剂为丁苯橡胶，分散剂为羧甲基纤维素。
在本实施例中，阳极极片的制备方法包括以下步骤：
取一集流体1，集流体1的一侧电连接有一个极耳2，在集流体1的至少一表面涂覆阳极浆料，在极耳2的至少一表面涂覆支撑浆料，阳极浆料和支撑浆料互不相溶；
烘干阳极浆料和支撑浆料，形成相连接的膜片涂层3和支撑层4，得到阳极极片。
实施例2
参考图4～6，本实施例提供一种阳极极片，其与实施例1不同的是：
在本实施例中，阳极极片还包括加强压痕5，加强压痕5设置于极耳2的空白区。
在本实施例中，阳极极片的制备方法包括以下步骤：
取一集流体1，集流体1的一侧电连接有多个极耳2，在集流体1的至少一表面涂覆阳极浆料，在极耳2的至少一表面涂覆支撑浆料，阳极浆料和支撑浆料互不相溶；
烘干阳极浆料和支撑浆料，形成相连接的膜片涂层3和支撑层4，得到阳极极片；
辊压阳极极片，在极耳2的空白区表面形成加强压痕5。
其余同实施例1，这里不再赘述。
实施例3
参考图7～9，本实施例提供一种阳极极片，其与实施例1不同的是：
在本实施例中，阳极极片还包括加强压痕5，加强压痕5设置于极耳2 的空白区和支撑层4所在区域。
在本实施例中，阳极极片的制备方法包括以下步骤：
取一集流体1，集流体1的两侧均电连接有多个极耳2，在集流体1的至少一表面涂覆阳极浆料，在极耳2的至少一表面涂覆支撑浆料，阳极浆料和支撑浆料互不相溶；
烘干阳极浆料和支撑浆料，形成相连接的膜片涂层3和支撑层4，得到阳极极片；
辊压阳极极片，在极耳2的空白区表面和支撑层4的表面形成加强压痕5。
实施例4
本实施例提供一种阳极极片，其与实施例1不同的是：
在本实施例中，支撑层4的宽度为极耳2长度的5％。
其余同实施例1，这里不再赘述。
实施例5
本实施例提供一种阳极极片，其与实施例1不同的是：
在本实施例中，支撑层4的宽度为极耳2长度的20％。
其余同实施例1，这里不再赘述。
实施例6
本实施例提供一种阳极极片，其与实施例1不同的是：
在本实施例中，支撑层4的宽度为极耳2长度的60％。
其余同实施例1，这里不再赘述。
实施例7
本实施例提供一种阳极极片，其与实施例1不同的是：
在本实施例中，支撑层4的宽度为极耳2长度的80％。
其余同实施例1，这里不再赘述。
实施例8
本实施例提供一种阳极极片，其与实施例1不同的是：
在本实施例中，支撑层4的厚度为膜片涂层3的厚度的3％。
其余同实施例1，这里不再赘述。
实施例9
本实施例提供一种阳极极片，其与实施例1不同的是：
在本实施例中，支撑层4的厚度为膜片涂层3的厚度的20％。
其余同实施例1，这里不再赘述。
实施例10
本实施例提供一种阳极极片，其与实施例1不同的是：
在本实施例中，支撑层4的厚度为膜片涂层3的厚度的60％。
其余同实施例1，这里不再赘述。
实施例11
本实施例提供一种阳极极片，其与实施例1不同的是：
在本实施例中，支撑层4的厚度为膜片涂层3的厚度的80％。
其余同实施例1，这里不再赘述。
实施例12
本实施例提供一种阳极极片，其与实施例1不同的是：
在本实施例中，支撑层4的厚度为膜片涂层3的厚度的100％。
其余同实施例1，这里不再赘述。
实施例13～24
一种锂离子电池，包括阳极极片、阴极极片、间隔设置于阳极极片和阴极极片之间的隔膜，以及电解液。
阳极极片分别为实施例1～12的阳极极片。
阴极极片包括阴极集流体以及设置于阴极集流体至少一表面的阴极膜片涂层。阴极集流体优选为铝箔。阴极膜片由阴极浆料涂覆烘干而得，阴极浆料包括阴极活性物质96份、阴极导电剂2份和阴极粘接剂2份。其中，阴极活性物质优选为磷酸铁锂，阴极导电剂优选为导电碳，阴极粘接剂优选为聚偏氟乙烯。
对比例1
本对比例提供一种阳极极片，包括集流体和与集流体电连接的极耳，集流体的至少一表面设置有膜片涂层。具体的，集流体为金属箔，优选为厚度小于或等于6μm的铜箔。
在本对比例中，膜片涂层由阳极浆料涂覆烘干而得，阳极浆料包括96份阳极活性物质、1.5份阳极导电剂、1.5份阳极粘接剂和1份分散剂，阳极活性物质为人造石墨、天然石墨、硅碳复合材料或钛酸锂，阳极导电剂为导电炭黑、碳纳米管或石墨烯，阳极粘接剂为丁苯橡胶，分散剂为羧甲基纤维素。
在本对比例中，阳极极片的制备方法包括以下步骤：
取集流体，集流体电连接有极耳，在集流体的至少一表面涂覆阳极浆料；
烘干阳极浆料形成膜片涂层，得到阳极极片。
对比例2
本对比例提供一种阳极极片，与实施例1不同的是：
在本实施例中，支撑浆料包括油性粘接剂。油性粘接剂为聚偏氟乙烯。
在本实施例中，支撑浆料还包括碳粉、金属氧化物和导电碳中的至少一种。
在本实施例中，阳极极片的制备方法包括以下步骤：
取一集流体1，集流体1的一侧电连接有一个极耳2，在集流体1的至少一表面涂覆阳极浆料，在极耳2的至少一表面涂覆支撑浆料，阳极浆料和支撑浆料部分互溶，且支撑浆料部分析出；
烘干阳极浆料和支撑浆料，形成膜片涂层3和支撑层4，得到阳极极片。
性能测试
采用实施例1～12和对比例1的阳极极片分别制备100个锂离子电池，观察成品中极耳是否出现下榻、翻折、卷曲等现象，未出现则记为合格，计算产品优率。测试结果如表1所示。
表1测试结果
  实施例1 实施例2 实施例3 实施例4 实施例5
产品优率(％) 93 97 99 87 88
  实施例6 实施例7 实施例8 实施例9 实施例10
产品优率(％) 90 95 87 89 94
  实施例11 实施例12 对比例1 对比例2  
产品优率(％) 95 96 78 82  
由表1的测试结果可以看出，采用本发明的阳极极片生产的锂离子电池其产品优率较高，而且采用极耳设置有加强压痕的阳极极片其产品优率更高。由此可见，支撑层具有增强极耳强度的作用，加设加强压痕有更优的增强极耳强度作用。
具体的，由实施例1和4～7对比可知，在支撑层的厚度一定时，支撑层宽度越大，产品优率更大，这是因为支撑层的宽度越大，极耳的重心就越往极耳的头部移，从而起到更好的支撑作用。由实施例1和实施例8～12对比可知，在支撑层的宽度一定时，支撑层厚度越大，产品优率更大，这是因为支撑层的厚度越大，极耳的重心就越往极耳的头部移，从而起到更好的支撑作用。由实施例1和对比例1对比可知，采用油性粘接剂的支撑层其效果明显差于采用水性粘接剂的，因为阳极浆料是水性的，水性的阳极浆料和油性的支撑浆料会产生互溶，而且支撑浆料中的聚偏氟乙烯遇水会析出，从而降低其对极耳的支撑作用。
根据上述说明书的揭示和教导，本发明所属领域的技术人员还能够对上述实施方式进行变更和修改。因此，本发明并不局限于上述的具体实施方式，凡是本领域技术人员在本发明的基础上所作出的任何显而易见的改进、替换或变型均属于本发明的保护范围。此外，尽管本说明书中使用了一些特定的术语，但这些术语只是为了方便说明，并不对本发明构成任何限制。

Claims (12)

  1. 一种阳极极片，其特征在于，包括：
    集流体，至少一面设置有膜片涂层，
    极耳，与所述集流体电连接，所述极耳的至少一面设置有与所述膜片涂层相连接的支撑层。
  2. 根据权利要求1所述的阳极极片，其特征在于，所述支撑层的宽度为所述极耳长度的5～80％，所述支撑层的厚度为所述膜片涂层的厚度的3～100％。
  3. 根据权利要求1所述的阳极极片，其特征在于：所述支撑层由含有粘接剂的支撑浆料经过涂覆干燥形成。
  4. 根据权利要求3所述的阳极极片，其特征在于：所述粘接剂为与所述膜片涂层互不相溶的水性粘接剂或水性粘接剂的水溶液。
  5. 根据权利要求4所述的阳极极片，其特征在于：所述水性粘接剂包括羧甲基纤维素钠、聚丙烯腈、聚乙烯吡咯烷酮和丙烯酸树脂中的至少一种。
  6. 根据权利要求3所述的阳极极片，其特征在于：所述支撑浆料还包括碳粉、金属氧化物和导电碳中的至少一种。
  7. 根据权利要求1所述的阳极极片，其特征在于：所述支撑层远离所述膜片涂层的一端设置为直线状、锯齿状或波浪状。
  8. 根据权利要求1所述的阳极极片，其特征在于：还包括加强压痕，所述加强压痕设置于所述极耳的空白区，或者所述加强压痕设置于所述极耳的空白区和所述支撑层所在区域。
  9. 根据权利要求1所述的阳极极片，其特征在于：所述极耳设置有N个，N≥2，N个所述极耳位于所述集流体的同侧或两侧。
  10. 一种阳极极片的制备方法，其特征在于，包括以下步骤：
    取一集流体，所述集流体电连接有极耳，在所述集流体的至少一表面涂覆阳极浆料，在极耳的至少一表面涂覆支撑浆料，所述阳极浆料和所述支撑浆料互不相溶；
    烘干所述阳极浆料和所述支撑浆料，形成相连接的膜片涂层和支撑层， 得到阳极极片。
  11. 根据权利要求10所述的阳极极片的制备方法，其特征在于，还包括以下步骤：
    辊压所述阳极极片，在所述极耳的空白区表面形成加强压痕，或者在所述极耳的空白区表面和所述支撑层的表面形成加强压痕。
  12. 一种锂离子电池，包括阳极极片、阴极极片、间隔于所述阳极极片和所述阴极极片之间的隔膜，以及电解液，其特征在于：所述阳极极片为权利要求1～9任一项所述的阳极极片。
PCT/CN2021/089568 2020-05-26 2021-04-25 一种阳极极片及其制备方法、锂离子电池 WO2021238537A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202010456523.2 2020-05-26
CN202010456523.2A CN111640948A (zh) 2020-05-26 2020-05-26 一种阳极极片及其制备方法、锂离子电池

Publications (1)

Publication Number Publication Date
WO2021238537A1 true WO2021238537A1 (zh) 2021-12-02

Family

ID=72332815

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2021/089568 WO2021238537A1 (zh) 2020-05-26 2021-04-25 一种阳极极片及其制备方法、锂离子电池

Country Status (2)

Country Link
CN (1) CN111640948A (zh)
WO (1) WO2021238537A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114512629A (zh) * 2022-01-25 2022-05-17 惠州市豪鹏科技有限公司 一种正极片的制备方法及其锂二次电池
US20220376369A1 (en) * 2021-05-18 2022-11-24 GM Global Technology Operations LLC Method of forming edge materials on electrochemical cell component

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111640948A (zh) * 2020-05-26 2020-09-08 江苏塔菲尔新能源科技股份有限公司 一种阳极极片及其制备方法、锂离子电池
CN111916645B (zh) * 2020-07-01 2021-11-30 江苏塔菲尔新能源科技股份有限公司 极片、极片的制备方法及电池
CN112436102B (zh) * 2020-11-24 2022-02-18 珠海冠宇电池股份有限公司 极片、电芯及极片夹持组件
CN113130838B (zh) * 2021-03-17 2023-03-10 惠州锂威新能源科技有限公司 一种多极耳电芯极片的制备方法、多极耳电芯极片及多极耳电芯
CN115000345B (zh) * 2022-06-27 2023-03-17 楚能新能源股份有限公司 电池极片及其生产方法、包含该极片的电池芯包和电池

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN206250284U (zh) * 2016-12-02 2017-06-13 东莞新能源科技有限公司 一种阳极极片及其电芯
CN206806433U (zh) * 2017-04-10 2017-12-26 江西安驰新能源科技有限公司 一种防止极耳翻褶的锂电池极片
CN110911637A (zh) * 2019-12-05 2020-03-24 东莞塔菲尔新能源科技有限公司 一种负极片、其制备方法和锂离子电池
CN210200866U (zh) * 2019-09-04 2020-03-27 江苏塔菲尔新能源科技股份有限公司 一种带条点结合印花极耳的极片及其成型夹具
CN210535760U (zh) * 2019-08-14 2020-05-15 宁德时代新能源科技股份有限公司 电极组件和二次电池
CN111564637A (zh) * 2020-05-19 2020-08-21 江苏塔菲尔新能源科技股份有限公司 一种极片及其制备方法和锂离子电池
CN111640948A (zh) * 2020-05-26 2020-09-08 江苏塔菲尔新能源科技股份有限公司 一种阳极极片及其制备方法、锂离子电池

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001039293A2 (en) * 1999-11-23 2001-05-31 Moltech Corporation Methods of preparing electrochemical cells
KR101811838B1 (ko) * 2015-04-22 2017-12-22 주식회사 엘지화학 이차전지 전극용 절연 조성물 및 전극 탭 상에 절연 조성물이 코팅된 전극
CN105244470A (zh) * 2015-09-11 2016-01-13 合肥国轩高科动力能源有限公司 一种高安全锂离子叠片电池正极片及其制备方法
CN206250283U (zh) * 2016-12-02 2017-06-13 东莞新能源科技有限公司 一种阴极极片及电芯
CN107681117A (zh) * 2017-09-19 2018-02-09 合肥国轩高科动力能源有限公司 一种涂有陶瓷浆料的锂离子电池极片及其制备工艺
CN108400386A (zh) * 2018-01-25 2018-08-14 柔电（武汉）科技有限公司 提高弯曲性能的柔性电池的制备方法
CN111180666B (zh) * 2019-06-28 2021-12-24 宁德时代新能源科技股份有限公司 一种电极极片和电化学装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN206250284U (zh) * 2016-12-02 2017-06-13 东莞新能源科技有限公司 一种阳极极片及其电芯
CN206806433U (zh) * 2017-04-10 2017-12-26 江西安驰新能源科技有限公司 一种防止极耳翻褶的锂电池极片
CN210535760U (zh) * 2019-08-14 2020-05-15 宁德时代新能源科技股份有限公司 电极组件和二次电池
CN210200866U (zh) * 2019-09-04 2020-03-27 江苏塔菲尔新能源科技股份有限公司 一种带条点结合印花极耳的极片及其成型夹具
CN110911637A (zh) * 2019-12-05 2020-03-24 东莞塔菲尔新能源科技有限公司 一种负极片、其制备方法和锂离子电池
CN111564637A (zh) * 2020-05-19 2020-08-21 江苏塔菲尔新能源科技股份有限公司 一种极片及其制备方法和锂离子电池
CN111640948A (zh) * 2020-05-26 2020-09-08 江苏塔菲尔新能源科技股份有限公司 一种阳极极片及其制备方法、锂离子电池

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220376369A1 (en) * 2021-05-18 2022-11-24 GM Global Technology Operations LLC Method of forming edge materials on electrochemical cell component
US11715866B2 (en) * 2021-05-18 2023-08-01 GM Global Technology Operations LLC Method of forming edge materials on electrochemical cell component
CN114512629A (zh) * 2022-01-25 2022-05-17 惠州市豪鹏科技有限公司 一种正极片的制备方法及其锂二次电池

Also Published As

Publication number Publication date
CN111640948A (zh) 2020-09-08

Similar Documents

Publication Publication Date Title
WO2021238537A1 (zh) 一种阳极极片及其制备方法、锂离子电池
CN105097289B (zh) 混合储能器件
Qin et al. Ni (OH) 2/CNTs hierarchical spheres for a foldable all-solid-state supercapacitor with high specific energy
WO2010035827A1 (ja) 電気化学素子用電極の製造方法
CN105470460B (zh) 一种锂离子电池负极片及其制作方法
CN112103469B (zh) 一种硅碳负极极片及其制备方法和锂离子电池
CN105098293A (zh) 混合储能器件
CN107681214A (zh) 一种锂离子电芯补锂方法
CN108336297A (zh) 一种锂离子电池极片制备方法
CN110136994A (zh) 一种高能量密度的纤维状超级电容器及其制备方法
CN110828195B (zh) 一种具有Cu过渡层的超级电容器极片及其制备方法
EP4145476A1 (en) Positive electrode of hybrid capacitor and manufacturing method therefor and use thereof
CN111180730A (zh) 快速充放电石墨烯动力锂电池及其制备方法
WO2023165070A1 (zh) 一种负极片及其制备方法和锂电池
WO2023029555A1 (zh) 一种负极片及其制备方法和应用
CN107680819B (zh) 一种锂离子电容器
CN108806999B (zh) 电极材料、超级电容器、电子设备和制备电极材料的方法
CN114156602B (zh) 具有多涂层的固态电解质隔膜及制备方法和应用
WO2022134376A1 (zh) 一种锂离子电容器负极极片和锂离子电容器及其制备方法
CN116130599A (zh) 一种钠离子电池负极极片
CN116190668A (zh) 一种超轻集流体及其制备方法及应用
CN115588730A (zh) 一种正极片及其制备方法和包括该正极片的电池
CN112701246B (zh) 电极片和电池
CN112420399B (zh) 一种高比特性锂离子电容器及其制备方法
CN110783112B (zh) 一种具有Ag过渡层的超级电容器极片及其制备方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21814402

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21814402

Country of ref document: EP

Kind code of ref document: A1