WO2023102955A1 - 一种新型微孔复合箔材及其制备方法 - Google Patents
一种新型微孔复合箔材及其制备方法 Download PDFInfo
- Publication number
- WO2023102955A1 WO2023102955A1 PCT/CN2021/137503 CN2021137503W WO2023102955A1 WO 2023102955 A1 WO2023102955 A1 WO 2023102955A1 CN 2021137503 W CN2021137503 W CN 2021137503W WO 2023102955 A1 WO2023102955 A1 WO 2023102955A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- foil
- pet
- composite foil
- layer
- composite
- Prior art date
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
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/80—Porous plates, e.g. sintered carriers
-
- 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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
-
- 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
-
- 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 of lithium ion batteries, and in particular relates to a novel microporous composite foil and a preparation method thereof.
- lithium-ion batteries Due to its advantages of high energy density, environmental friendliness and long service life, lithium-ion batteries have been widely used in portable energy, energy storage power and electric vehicles.
- lithium-ion batteries mainly include positive electrodes, negative electrodes, separators, and electrolytes.
- the positive active material is coated on aluminum foil, and the negative active material is coated on the foil.
- Aluminum foil and copper foil, as current collectors for positive and negative electrodes, have a great influence on the energy density of lithium-ion batteries. With the improvement of battery energy density requirements, as a current collector, it is also required to develop in the direction of thinner, higher strength and lighter weight.
- Ultra-thin foils ( ⁇ 6 ⁇ m), high-tensile-strength foils, microporous foils, composite foils, etc. are on the market one after another.
- the microporous foil is lighter in weight, and a complete ion and electron transmission channel is constructed between the active materials in the pole piece.
- the electrolyte can effectively infiltrate into the joint between the coating material and the current collector, and improve the problem of uneven coating. Better rate capability, but weaker tensile strength than normal foils.
- the composite PET foil can reduce the weight of the foil, increase the tensile strength and flexibility, and improve the safety performance of the battery cell, but the PET laminate blocks the ion and electron transmission channels of the active materials on both sides, increasing the internal resistance of the battery.
- the purpose of the present invention is to overcome the deficiencies of the prior art and provide a novel microporous composite foil to enhance the bonding force between the foil and the coating and improve the overall energy density of the lithium-ion battery.
- a novel microporous composite foil comprising a PET composite foil and a plurality of micropores penetrating through the PET composite foil.
- the PET composite foil includes a PET base film, the upper surface and the lower surface of the PET base film are respectively compounded with a first foil layer and a second foil layer, and the first foil layer and the second foil layer
- the foil layers are all copper foil or aluminum foil.
- the thickness of the PET composite foil is 4-18 ⁇ m, and the thickness of the PET base film is 2-10 ⁇ m.
- the thickness of the PET composite foil is 5-10 ⁇ m, and the thickness of the PET base film is 3-7 ⁇ m.
- the thickness of the first foil layer and the thickness of the second foil layer are respectively 1-5 ⁇ m.
- the diameter of the micropores is 0.5-150 ⁇ m, and the number of micropores per square centimeter of the PET composite foil is 100-5000.
- the inner surfaces of the micropores are respectively provided with a metallized layer, the thickness of the metallized layer is 10-1000 nm, and the material of the metallized layer is the same as that of the first foil layer.
- Another object of the present invention is to provide a method for preparing the above-mentioned novel microporous composite foil, comprising the following steps:
- micropores are electroplated to form an electronic conduction structure, combining the advantages of both microporous foils and composite foils, not only light in weight and high in strength, but also able to make up for the problem of uneven coating , Enhance the bonding force between the foil and the negative electrode material.
- step (2) punching the PET composite foil: forming micropores penetrating through both sides of the PET composite foil by means of etching.
- the method of drilling the PET composite foil is selected from one of laser drilling, precision drilling or etching.
- the present invention integrates the advantages of microporous foil and composite PET foil, combines the preparation of a new type of microporous composite foil, and performs special treatment on the micropores (electroplated micropores connect the two sides of the composite foil),
- the ion and electron transport channels that connect the active materials on both sides improve the overall energy density of the lithium-ion battery and enhance the adhesion between the foil and the coating.
- Fig. 1 is the general structure schematic diagram of novel microporous composite foil of the present invention
- a new type of microporous composite foil includes a PET composite foil 1 and micropores 2 passing through the PET composite foil; the PET composite foil includes a PET matrix film 1-1, the The upper surface and the lower surface of the PET base film are compounded with a first foil layer 1-2 and a second foil layer 1-3 respectively; the inner surfaces of the micropores 2 are respectively provided with metallized layers 2-1.
- PET composite copper foil Take a PET base film with a thickness of 4 ⁇ m, and compound 2 ⁇ m copper foil on its upper surface and lower surface respectively to form a PET composite copper foil of 8 ⁇ m; the PET composite copper foil is drilled with a laser to form microscopic holes that penetrate the PET composite copper foil. holes, the diameter of the micropores is 20 ⁇ m, and the number of micropores per square centimeter is 500; the perforated PET composite copper foil is electroplated in a copper sulfate solution to form a PET composite copper foil containing copper-plated through holes .
- PET composite aluminum foil Take a PET base film with a thickness of 7 ⁇ m, compound a 4 ⁇ m aluminum foil on its upper surface, and a 5 ⁇ m aluminum foil on its lower surface to form a 16 ⁇ m PET composite aluminum foil; the PET composite aluminum foil is perforated by laser to form micropores through the PET composite aluminum foil, The pore diameter of the micropores is 35 ⁇ m, and the number of micropores per square centimeter is 1000; the perforated PET composite aluminum foil is electroplated in an aluminum sulfate solution to form a PET composite aluminum foil with aluminized through-holes.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
一种锂离子电池用微孔复合箔材及其制备方法,包括PET复合箔材和若干贯通所述PET复合箔材的微孔。该方法综合微孔箔材和复合PET箔材的优势,结合制备新型微孔复合箔材,并且对微孔进行特殊处理(电镀微孔连接复合箔材两面),连通两面活性物质的离子与电子传输通道,提高了锂离子电池的整体能量密度,增强了箔材与涂层之间的粘结力。
Description
本发明属于锂离子电池技术领域,具体涉及一种新型微孔复合箔材及其制备方法。
锂离子电池以其高能量密度、环境友好和使用寿命长等优势,在便携式能源、储能电源和电动汽车上得到的大规模应用。
目前锂离子电池主要包含正极、负极、隔膜和电解液等成分,正极活性物质涂覆在铝箔上,负极活性物质涂覆在箔材上。铝箔和铜箔作为正负极的集流体对锂离子电池的能量密度影响较大。随着对电池能量密度要求的提高,作为集流体也要求更薄、强度更高、更轻量的方向发展。超薄箔材(≤6μm)、高抗拉强度的箔材、微孔箔材、复合箔材等纷纷上市。
微孔箔材质量更轻,在极片中活性物质之间构建了完整的离子与电子的传输通道,电解液有效浸润到涂层材料与集流体的结合部,改善涂布不均问题,具有更好的倍率性能,但相比正常箔材拉伸强度减弱。复合PET箔材可以减轻箔材的重量,提高拉伸强度和柔韧性,改善电芯的安全性能,但是PET层合阻隔了两面活性物质的离子与电子传输通道,增大电池的内阻。
发明内容
本发明目的在于克服现有技术的不足,提供一种新型微孔复合箔材,以增强箔材与涂层之间的粘结力,提高锂离子电池的整体能量密度。
为达到上述目的,本发明采用的技术方案如下:
一种新型微孔复合箔材,包括PET复合箔材和若干贯通所述PET复合箔材的微孔。
进一步地,所述PET复合箔材包括PET基体薄膜,所述PET基体薄膜的上表面和下表面分别复合有第一箔材层和第二箔材层,所述第一箔材层和第二箔材层均为铜箔或铝箔。
进一步地,所述PET复合箔材的厚度为4~18μm,所述PET基体薄膜的厚度为2~10μm。
进一步地,所述PET复合箔材的厚度为5~10μm,所述PET基体薄膜的厚度为3~7μm。
进一步地,所述第一箔材层的厚度和第二箔材层的厚度分别为1~5μm。
进一步地,所述微孔的孔径为0.5~150μm,每平方厘米PET复合箔材上的微孔数量为100~5000个。
进一步地,所述微孔的内表面分别设有镀金属层,所述镀金属层的厚度为10~1000nm,所述镀金属层的材质与第一箔材层的金属材质相同。
基于一个总的发明构思,本发明的另一个目的在于提供上述新型微孔复合箔材的制备方法,包括如下步骤:
(1)在PET基体薄膜的上表面和下表面分别复合第一箔材层和第二箔材层,形成PET复合箔材;
(2)对PET复合箔材进行打孔,形成贯通所述PET复合箔材两面的微孔;
(3)对微孔的内表面进行电镀处理,形成电子导通的结构,综合微孔箔材和复合箔材两者的优势,不仅质量轻、强度高,而且能够弥补涂布不均的问题、增强箔材和负极材料的粘结力。
优选地,步骤(2),对PET复合箔材进行打孔:通过刻蚀的方法形成贯通PET复合箔材两面的微孔。
优选地,步骤(2),对PET复合箔材进行打孔的方式选自激光打孔、精密钻孔或刻蚀成孔中的一种。
与现有技术相比,本发明综合微孔箔材和复合PET箔材的优势,结合制备新型微孔复合箔材,并且对微孔进行特殊处理(电镀微孔连接复合箔材的两面),连通两面活性物质的离子与电子传输通道,提高了锂离子电池的整体能量密度,增强了箔材与涂层之间的粘结力。
图1本发明新型微孔复合箔材的总体结构示意图;
图1标记含义如下:1、PET复合箔材;2、微孔;1-1、PET基体薄膜;1-2、第一箔材层;1-3、第二箔材层;2-1、镀金属层。
为使本发明的目的、技术方案和优点更加明白清楚,结合具体实施方式,对 本发明做进一步描述,但是本发明并不限于这些实施例。需要说明的是,在不相冲突的前提下,以下描述的各实施例之间或各技术特征之间可以任意组合形成新的实施例。在本发明中,若非特指,所采用的设备和原料等均可从市场购得或是本领域常用的。下述实施例中的方法,如没有特别说明,均为本领域的常规方法。
下面结合附图对本发明的具体实施例做详细说明。
一种新型微孔复合箔材,如图1所示,包括PET复合箔材1和贯通所述PET复合箔材的微孔2;所述PET复合箔材包括PET基体薄膜1-1,所述PET基体薄膜的上表面和下表面分别复合有第一箔材层1-2和第二箔材层1-3;所述微孔2的内表面分别设有镀金属层2-1。
实施例1
取厚度为4μm的PET基体薄膜,在其上表面和下表面分别复合2μm铜箔,形成8μm的PET复合铜箔;对PET复合铜箔通过激光打孔,形成贯通所述PET复合铜箔的微孔,所述微孔的孔径为20μm,每平方厘米微孔的数量为500个;将经过打孔的PET复合铜箔,在硫酸铜溶液中电镀处理形成含镀铜通孔的PET复合铜箔。
实施例2
取厚度为7μm的PET基体薄膜,在其上表面复合4μm铝箔、下表面复合5μm铝箔,形成16μm的PET复合铝箔;对PET复合铝箔通过激光打孔,形成贯通所述PET复合铝箔的微孔,所述微孔的孔径为35μm,每平方厘米微孔的数量为1000个;将经过打孔的PET复合铝箔,在硫酸铝溶液中电镀处理形成含镀铝通孔的PET复合铝箔。
实施例3
取厚度为3μm的PET基体薄膜,在其上表面复合1μm铜箔、下表面复合1μm铜箔,形成5μm的PET复合铜箔;对PET复合铜箔通过激光打孔,形成贯通所述PET复合铜箔的微孔,所述微孔的孔径为1μm,每平方厘米微孔的数量为3500个;将经过打孔的PET复合铜箔,在硫酸铜溶液中电镀处理形成含镀铜通孔的PET复合铜箔。
表1不同类型的铜箔面密度比较
表2不同类型的铜箔涂覆后粘结力比较表
上述实施例仅是本发明的较优实施方式,凡是依据本发明的技术实质对以上实施例所做的任何简单修饰、修改及替代变化,均属于本发明技术方案的范围内。
Claims (10)
- 一种新型微孔复合箔材,其特征在于,包括PET复合箔材和若干贯通所述PET复合箔材的微孔。
- 根据权利要求1所述的一种新型微孔复合箔材,其特征在于,所述PET复合箔材包括PET基体薄膜,所述PET基体薄膜的上表面和下表面分别复合有第一箔材层和第二箔材层,所述第一箔材层和第二箔材层均为铜箔或铝箔。
- 根据权利要求2所述的一种新型微孔复合箔材,其特征在于,所述PET复合箔材的厚度为4~18μm,所述PET基体薄膜的厚度为2~10μm。
- 根据权利要求3所述的一种新型微孔复合箔材,其特征在于,所述PET复合箔材的厚度为5~10μm,所述PET基体薄膜的厚度为3~7μm。
- 根据权利要求2~4中任一项所述的一种新型微孔复合箔材,其特征在于,所述第一箔材层的厚度和第二箔材层的厚度分别为1~5μm。
- 根据权利要求1所述的一种新型微孔复合箔材,其特征在于,所述微孔的孔径为0.5~150μm,每平方厘米PET复合箔材上的微孔数量为100~5000个。
- 根据权利要求1所述的一种新型微孔复合箔材,其特征在于,所述微孔的内表面分别设有镀金属层,所述镀金属层的厚度为10~1000nm,所述镀金属层的材质与第一箔材层的金属材质相同。
- 一种制备权利要求2所述的新型微孔复合箔材的方法,其特征在于,包括如下步骤:(1)在PET基体薄膜的上表面和下表面分别复合第一箔材层和第二箔材层,形成PET复合箔材;(2)对PET复合箔材进行打孔,形成贯通所述PET复合箔材两面的微孔;(3)对微孔的内表面进行电镀处理,形成电子导通的结构。
- 根据权利要求8所述的一种新型微孔复合箔材制备方法,其特征在于,步骤(2),对PET复合箔材进行打孔:通过刻蚀的方法形成贯通PET复合箔材两面的微孔。
- 根据权利要求8所述的一种新型微孔复合箔材制备方法,其特征在于,步骤(2),对PET复合箔材进行打孔的方式选自激光打孔、精密钻孔或刻蚀成孔中的一种。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202111508234.3 | 2021-12-10 | ||
CN202111508234.3A CN114204039A (zh) | 2021-12-10 | 2021-12-10 | 一种新型微孔复合箔材及其制备方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023102955A1 true WO2023102955A1 (zh) | 2023-06-15 |
Family
ID=80652159
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2021/137503 WO2023102955A1 (zh) | 2021-12-10 | 2021-12-13 | 一种新型微孔复合箔材及其制备方法 |
Country Status (2)
Country | Link |
---|---|
CN (1) | CN114204039A (zh) |
WO (1) | WO2023102955A1 (zh) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114695900B (zh) * | 2022-05-31 | 2022-09-23 | 江苏卓高新材料科技有限公司 | 复合集流体、正极极片以及正极极片的制备方法 |
JP7461518B1 (ja) | 2023-01-10 | 2024-04-03 | ソフトバンク株式会社 | 集電体、電極、電池、飛行体、集電体を生産する方法、電極を生産する方法、及び、電池を生産する方法 |
CN116722150B (zh) * | 2023-07-03 | 2024-03-01 | 广州方邦电子股份有限公司 | 一种复合箔材及其应用 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008255202A (ja) * | 2007-04-04 | 2008-10-23 | Asahi Kasei Chemicals Corp | 複合微多孔膜、電池用セパレータ、及び複合微多孔膜の製造方法 |
US20120315537A1 (en) * | 2011-06-10 | 2012-12-13 | Yardney Technical Products Inc. | Composite current collector, methods of manufacture thereof, and articles including the same |
CN108736016A (zh) * | 2018-08-01 | 2018-11-02 | 力信(江苏)能源科技有限责任公司 | 集流体及使用其制备的正极极片、电芯 |
CN108777308A (zh) * | 2018-05-30 | 2018-11-09 | 中航锂电(洛阳)有限公司 | 一种集流体及其制备方法、电化学储能装置 |
CN109698359A (zh) * | 2018-11-26 | 2019-04-30 | 中航锂电技术研究院有限公司 | 一种具有电互联、通孔结构的复合集流体及其制备方法、电池极片和锂离子电池 |
US20200313155A1 (en) * | 2019-03-29 | 2020-10-01 | Ningde Amperex Technology Limited | Composite current collector and composite electrode and electrochemical device comprising the same |
-
2021
- 2021-12-10 CN CN202111508234.3A patent/CN114204039A/zh active Pending
- 2021-12-13 WO PCT/CN2021/137503 patent/WO2023102955A1/zh unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008255202A (ja) * | 2007-04-04 | 2008-10-23 | Asahi Kasei Chemicals Corp | 複合微多孔膜、電池用セパレータ、及び複合微多孔膜の製造方法 |
US20120315537A1 (en) * | 2011-06-10 | 2012-12-13 | Yardney Technical Products Inc. | Composite current collector, methods of manufacture thereof, and articles including the same |
CN108777308A (zh) * | 2018-05-30 | 2018-11-09 | 中航锂电(洛阳)有限公司 | 一种集流体及其制备方法、电化学储能装置 |
CN108736016A (zh) * | 2018-08-01 | 2018-11-02 | 力信(江苏)能源科技有限责任公司 | 集流体及使用其制备的正极极片、电芯 |
CN109698359A (zh) * | 2018-11-26 | 2019-04-30 | 中航锂电技术研究院有限公司 | 一种具有电互联、通孔结构的复合集流体及其制备方法、电池极片和锂离子电池 |
US20200313155A1 (en) * | 2019-03-29 | 2020-10-01 | Ningde Amperex Technology Limited | Composite current collector and composite electrode and electrochemical device comprising the same |
Also Published As
Publication number | Publication date |
---|---|
CN114204039A (zh) | 2022-03-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2023102955A1 (zh) | 一种新型微孔复合箔材及其制备方法 | |
CN206849947U (zh) | 多孔导电塑料膜集流体 | |
JP3764470B1 (ja) | 非水電解液二次電池用負極 | |
CN106784600A (zh) | 一种含锂负极片及其制备方法 | |
CN113782840B (zh) | 一种全固态电芯及其制备方法和固态电池 | |
WO2023151400A1 (zh) | 一种复合集流体、制备方法及锂离子电池 | |
WO2005109548B1 (ja) | 非水電解液二次電池用負極及びその製造方法 | |
CN109256548A (zh) | 一种高强度超轻复合锂带及其制备方法 | |
CN112820862A (zh) | 一种兼顾安全和倍率放电性能的锂离子电池 | |
CN114221045A (zh) | 一种多孔炭补锂负极极片锂离子电池的制备方法 | |
CN113346192A (zh) | 一种锂离子电池复合隔膜及其制备方法和应用 | |
CN108832133A (zh) | 一种柔性集流体电池及其制造方法 | |
CN113764753B (zh) | 负极补锂方法及锂离子储能器件的制作方法 | |
WO2023019741A1 (zh) | 一种集流体的制备方法及极片 | |
CN101934269A (zh) | 一种正极磷酸亚铁锂材料的涂布工艺及其锂离子电池 | |
CN219610486U (zh) | 复合集流体、极片及电池 | |
CN113506877A (zh) | 一种高能量密度的微孔锂电池电极及制备方法 | |
EP4053857A1 (en) | Conductive thin film, preparation method for conductive thin film and lithium ion battery | |
JP4298578B2 (ja) | キャリア箔付き多孔質金属箔及びその製造方法 | |
JP2006228512A (ja) | 非水電解液二次電池用負極 | |
CN215815945U (zh) | 一种轻量化的复合集流体、包括其电极极片和锂离子电池 | |
CN217955456U (zh) | 一种替代金属塑料膜的导电膜 | |
CN220774417U (zh) | 一种新型复合薄膜集流体以及电池 | |
CN218513485U (zh) | 用于锂离子电池的集流体和包含该集流体的锂离子电池 | |
CN220341256U (zh) | 一种微孔集流体和锂离子电池 |
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: 21966873 Country of ref document: EP Kind code of ref document: A1 |