WO2021243611A1

WO2021243611A1 - Insulating tape, electrode plate and electrochemical device

Info

Publication number: WO2021243611A1
Application number: PCT/CN2020/094221
Authority: WO
Inventors: 戴志芳; 龙海
Original assignee: 宁德新能源科技有限公司
Priority date: 2020-06-03
Filing date: 2020-06-03
Publication date: 2021-12-09
Also published as: CN112805347A

Abstract

Provided are an insulating tape, and an electrode plate and electrochemical device using the insulating tape. The insulating tape comprises a substrate and a coating layer. The substrate comprises a first surface and a second surface arranged opposite to each other. The coating layer is arranged on the first surface. The coating layer comprises hard particles and an adhesive, wherein the weight of the hard particles is 30-99% of the total weight of the coating layer. In the present application, by using the hard particles in the coating layer, there is no shrinkage in the insulating tape during a nail penetration test of an electrochemical device, so that the pass rate of the nail penetration test of the electrochemical device can be improved.

Description

绝缘胶带、极片和电化学装置Insulating tape, pole piece and electrochemical device

技术领域Technical field

本申请涉及电化学装置领域，尤其涉及一种绝缘胶带及应用所述绝缘胶带的极片及电化学装置。This application relates to the field of electrochemical devices, and in particular to an insulating tape, a pole piece using the insulating tape, and an electrochemical device.

背景技术Background technique

锂离子电池具有体积和质量能量密度大、循环寿命长、标称电压高、自放电率低、体积小、重量轻等许多优点，在消费电子领域具有广泛的应用。随着近年来电动汽车和可移动电子设备的高速发展，人们对锂离子电池的能量密度、安全性、循环性能等相关需求越来越高。Lithium-ion batteries have many advantages such as large volume and mass energy density, long cycle life, high nominal voltage, low self-discharge rate, small size, and light weight, and have a wide range of applications in the field of consumer electronics. With the rapid development of electric vehicles and portable electronic devices in recent years, people have higher and higher requirements for the energy density, safety, and cycle performance of lithium-ion batteries.

穿钉测试是锂离子电池的一项较为严苛的安全测试，用于测试锂离子电池内部短路承受能力。由于锂离子电池的内圈存在空箔区，在进行穿钉测试时会产生铝-阳极短路，导致锂离子电池失效。为提高穿钉测试通过率，常用手段有通过延长位于阴极膜片起始位置处的绿胶覆盖该空箔区，以避免铝阳极短路。然而，由于绿胶在高温下易收缩，其也不能解决穿钉失效的问题，因此需要开发新的技术方案。The nail penetration test is a more stringent safety test for lithium-ion batteries. It is used to test the ability of the lithium-ion battery to withstand short circuits. Since there is an empty foil area in the inner ring of the lithium-ion battery, an aluminum-anode short circuit will occur during the nail penetration test, which will cause the lithium-ion battery to fail. In order to improve the pass rate of the nail penetration test, a common method is to extend the green glue at the starting position of the cathode diaphragm to cover the empty foil area to avoid short circuit of the aluminum anode. However, because green glue tends to shrink at high temperatures, it cannot solve the problem of nail penetration failure, so new technical solutions need to be developed.

发明内容Summary of the invention

基于以上现有技术的不足，本申请提供一种能够改善电化学装置的穿钉通过率的绝缘胶带，以及应用该绝缘胶带的极片及电化学装置。Based on the above shortcomings of the prior art, the present application provides an insulating tape capable of improving the nail penetration rate of an electrochemical device, as well as a pole piece and an electrochemical device using the insulating tape.

本申请实施例提供了一种绝缘胶带，其包括基材及涂层。基材包括相对设置的第一表面及第二表面。涂层设置在第一表面。涂层包括硬质颗粒及粘接剂，其中硬质颗粒的重量占涂层的总重量的30％～99％，硬质颗粒的硬度≥3莫氏硬度。The embodiment of the present application provides an insulating tape, which includes a substrate and a coating. The substrate includes a first surface and a second surface that are oppositely disposed. The coating is provided on the first surface. The coating includes hard particles and an adhesive, wherein the weight of the hard particles accounts for 30% to 99% of the total weight of the coating, and the hardness of the hard particles is ≥3 Mohs' hardness.

本申请提供的绝缘胶带，通过利用硬质颗粒的高硬度特性，使绝缘胶带在基材收缩的情况下仍然保持挺度，继续发挥绝缘作用。当应用于电化学装置中时，在进行穿钉测试过程中持续对集流体进行绝缘隔离，从而可避免穿钉测试时因集流体裸露导致的铝阳极短路，进而可改善穿钉测试通过率。The insulating tape provided by the present application utilizes the high hardness characteristics of hard particles, so that the insulating tape still maintains stiffness even when the base material shrinks, and continues to play an insulating role. When applied to an electrochemical device, the current collector is continuously insulated and isolated during the nail penetration test, so as to avoid the short circuit of the aluminum anode caused by the exposure of the current collector during the nail penetration test, thereby improving the pass rate of the nail penetration test.

在一些实施例中，绝缘胶带还包括胶层，胶层设置于第二表面或涂层背离基材的一侧。通过设置胶层，可增加绝缘胶带的粘性，且当胶层设置在涂层上时，可防止涂层脱落。In some embodiments, the insulating tape further includes an adhesive layer, and the adhesive layer is disposed on the second surface or the side of the coating away from the substrate. By providing the adhesive layer, the viscosity of the insulating tape can be increased, and when the adhesive layer is placed on the coating, the coating can be prevented from falling off.

在一些实施例中，胶层的厚度为1μm～10μm，可使绝缘胶带具有合适的粘性。In some embodiments, the thickness of the adhesive layer is 1 μm-10 μm, so that the insulating tape can have suitable adhesion.

在一些实施例中，所述硬质颗粒的重量占所述涂层的总重量的85％～99％。In some embodiments, the weight of the hard particles accounts for 85% to 99% of the total weight of the coating.

在一些实施例中，所述硬质颗粒的重量占所述涂层的总重量的85％～90％，可使绝缘胶带保持高的挺度和粘性。In some embodiments, the weight of the hard particles accounts for 85% to 90% of the total weight of the coating, so that the insulating tape can maintain high stiffness and viscosity.

在一些实施例中，硬质颗粒为陶瓷颗粒，陶瓷颗粒包括氧化铝、勃姆石、氢氧化镁、硫酸钡、硅酸钙或二氧化钛中的至少一种。In some embodiments, the hard particles are ceramic particles, and the ceramic particles include at least one of alumina, boehmite, magnesium hydroxide, barium sulfate, calcium silicate, or titanium dioxide.

在一些实施例中，涂层的厚度为3μm～19μm，基材的厚度为6μm～30μm。涂层以及基材的厚度满足上述要求，可使涂层能够抵抗基材的收缩力，从而可抑制基材的收缩。In some embodiments, the thickness of the coating is 3 μm to 19 μm, and the thickness of the substrate is 6 μm to 30 μm. The thickness of the coating and the substrate meets the above requirements, so that the coating can resist the shrinking force of the substrate, thereby suppressing the shrinkage of the substrate.

在一些实施例中，粘接剂包括羧甲基纤维素、丁苯橡胶、聚偏氟乙烯、聚四氟乙烯、氟化橡胶、聚氨酯、聚丙烯醇、聚丙烯酸钠、聚醚酰胺亚或丙烯酸酯中的至少一种。In some embodiments, the adhesive includes carboxymethyl cellulose, styrene butadiene rubber, polyvinylidene fluoride, polytetrafluoroethylene, fluorinated rubber, polyurethane, polyacryl alcohol, sodium polyacrylate, polyether amide or acrylic At least one of esters.

在一些实施例中，基材包括聚对苯二甲酸乙二醇酯、聚酰亚胺、聚氯乙烯、聚丙烯或聚乙烯中的至少一种。In some embodiments, the substrate includes at least one of polyethylene terephthalate, polyimide, polyvinyl chloride, polypropylene, or polyethylene.

本申请实施例还提供一种极片，包括集流体、活性物质层及上述绝缘胶带。活性物质层设置在集流体的至少一个表面。绝缘胶带设置于集流体上并与活性物质层的至少一个端部相连接。The embodiment of the present application also provides a pole piece, which includes a current collector, an active material layer, and the above-mentioned insulating tape. The active material layer is provided on at least one surface of the current collector. The insulating tape is arranged on the current collector and connected with at least one end of the active material layer.

本申请实施例还提供一种电化学装置，包括电芯，电芯包括第一极片、第二极片及设置于第一极片与第二极片之间的隔膜，第一极片及第二极片中至少一者为上述极片。The embodiment of the present application also provides an electrochemical device, including a battery cell, the battery cell includes a first pole piece, a second pole piece, and a diaphragm arranged between the first pole piece and the second pole piece, the first pole piece and At least one of the second pole pieces is the above pole piece.

附图说明Description of the drawings

为了更清楚地说明本申请实施方式或现有技术中的技术方案，下面将对实施方式或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly explain the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some implementations of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

图1为本申请一实施方式提供的绝缘胶带的结构示意图。FIG. 1 is a schematic diagram of the structure of an insulating tape provided by an embodiment of the application.

图2为本申请另一实施方式提供的绝缘胶带的结构示意图。FIG. 2 is a schematic diagram of the structure of an insulating tape provided by another embodiment of the application.

图3为本申请又一实施方式提供的绝缘胶带的结构示意图。FIG. 3 is a schematic structural diagram of an insulating tape provided by another embodiment of this application.

图4为本申请一实施方式提供的电化学装置的结构示意图。FIG. 4 is a schematic structural diagram of an electrochemical device provided by an embodiment of the application.

主要元件符号说明Symbol description of main components

绝缘胶带 100 Insulating tape 100

基材 120 Base material 120

第一表面 121 First surface 121

第二表面 123The second surface 123

涂层 140Coating 140

硬质颗粒 141 Hard particles 141

粘接剂 143 Adhesives 143

胶层 160 Glue layer 160

电芯 200 Cell 200

第一极片 210The first pole piece 210

第二极片 220The second pole piece 220

隔膜 250Diaphragm 250

第一集流体 221The first episode of fluid 221

第一活性物质层 213The first active material layer 213

第一未涂覆区 214The first uncoated area 214

涂覆区 215Coating area 215

第二未涂覆区 216The second uncoated area 216

第二集流体 221The second episode of fluid 221

第二活性物质层 223The second active material layer 223

如下具体实施方式将结合上述附图进一步说明本申请。The following specific embodiments will further illustrate this application in conjunction with the above-mentioned drawings.

具体实施方式detailed description

下面将结合本申请实施方式中的附图，对本申请实施方式中的技术方案进行清楚、完整的描述，显然，所描述的实施方式仅是本申请的一部分实施方式，而不是全部的实施方式。基于本申请中的实施方式，本领域普通技术人员在没有付出创造性劳动前提下所获得的所有其他实施方式，都属于本申请保护的范围。The following describes the technical solutions in the embodiments of the present application clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of them. Based on the implementation manners in this application, all other implementation manners obtained by a person of ordinary skill in the art without creative work shall fall within the protection scope of this application.

请参阅图1，本申请一实施方式提供一种绝缘胶带100，包括基材120以及涂层140。基材120包括相对设置的第一表面121及第二表面123。涂层140设置于第一表面121上。本实施方式中，涂层140完全覆盖第一表面121。在其他实施例中，涂层140可部分覆盖第一表面121。Please refer to FIG. 1, an embodiment of the present application provides an insulating tape 100 including a substrate 120 and a coating 140. The substrate 120 includes a first surface 121 and a second surface 123 opposite to each other. The coating 140 is disposed on the first surface 121. In this embodiment, the coating 140 completely covers the first surface 121. In other embodiments, the coating 140 may partially cover the first surface 121.

基材120用于承载涂层140，其材质可以采用聚对苯二甲酸乙二酯(PET)、聚酰亚胺(PI)、聚氯乙烯(PVC)、聚丙烯(PP)或聚乙烯(PE)等单一组分，也可以采用两种或两种以上材料进行复合。The substrate 120 is used to carry the coating 140, and its material can be polyethylene terephthalate (PET), polyimide (PI), polyvinyl chloride (PVC), polypropylene (PP) or polyethylene ( Single components such as PE) can also be combined with two or more materials.

涂层140包括硬质颗粒141及粘接剂143。硬质颗粒141具有高的结构强度，可以采用硬度高、重量轻的陶瓷颗粒，例如选自氧化铝、勃姆石、氢氧化镁、硫酸钡、硅酸钙、二氧化钛中的至少一种组分。硬质颗粒141的重量占涂层140的总重量的30％～99％，即涂层140中硬质颗粒141的质量百分比为30％～99％。涂层140中的硬质颗粒141使涂层140具有较高的挺度。当基材120发生收缩时，涂层140在硬质颗粒141的作用下会保持挺度而不会随着基材120收缩，即使得绝缘胶带100仍然保持挺度，从而可在基材120收缩的情况下继续对其贴覆的元件进行绝缘保护。当将该绝缘胶带100应用于锂离子电池中时，穿钉测试产生的局部热量仅会使基材120收缩，而涂层140依然保持挺度，可避免集流体裸露导致的铝阳极短路，从而改善锂离子电池的穿钉通过率。所述硬质颗粒141为硬度≥3莫氏硬度的颗粒。The coating 140 includes hard particles 141 and an adhesive 143. The hard particles 141 have high structural strength. Ceramic particles with high hardness and light weight can be used, such as at least one component selected from alumina, boehmite, magnesium hydroxide, barium sulfate, calcium silicate, and titanium dioxide. . The weight of the hard particles 141 accounts for 30% to 99% of the total weight of the coating 140, that is, the mass percentage of the hard particles 141 in the coating 140 is 30% to 99%. The hard particles 141 in the coating 140 make the coating 140 have a higher stiffness. When the substrate 120 shrinks, the coating 140 will maintain its stiffness under the action of the hard particles 141 without shrinking with the substrate 120, that is, the insulating tape 100 still maintains its stiffness, so that it can shrink on the substrate 120. Under the circumstance, continue to insulate and protect the covered components. When the insulating tape 100 is applied to a lithium-ion battery, the local heat generated by the nail penetration test will only shrink the substrate 120, while the coating 140 still maintains stiffness, which can avoid the short circuit of the aluminum anode caused by the exposed current collector. Improve the nail penetration rate of lithium-ion batteries. The hard particles 141 are particles with a hardness ≥ 3 Mohs hardness.

当硬质颗粒141的质量百分比小于30％时，涂层140在基材120发生收缩时不能保持挺度，会随着基材120的收缩而收缩。当硬质颗粒141的质量百分比大于99％时，涂层140不能具有足够的粘性使其黏附在基材120上，易出现脱落问题。When the mass percentage of the hard particles 141 is less than 30%, the coating 140 cannot maintain its stiffness when the substrate 120 shrinks, and will shrink as the substrate 120 shrinks. When the mass percentage of the hard particles 141 is greater than 99%, the coating layer 140 cannot have sufficient viscosity to make it adhere to the substrate 120, and the problem of shedding may easily occur.

在一些实施例中，涂层140中硬质颗粒141的质量百分比为85％～90％，可使涂层140的挺度达到最佳，且具有较合适的粘性。In some embodiments, the mass percentage of the hard particles 141 in the coating 140 is 85% to 90%, so that the stiffness of the coating 140 can be optimized and the coating 140 has a suitable viscosity.

涂层140的厚度会影响基材120的收缩情况。本实施方式中，涂层140的厚度为3μm～19μm，基材120的厚度为6μm～30μm。涂层140的厚度以及基材120的厚度满足上述条件后，可使得涂层140能够抵抗基材120的收缩力，从而可抑制基材120的收缩。若涂层140的厚度小于3μm，则无法抵抗基材120的收缩力。在一些实施例中，涂层140的厚度为8μm～10μm，基材120的厚度为6μm～10μm。The thickness of the coating 140 will affect the shrinkage of the substrate 120. In this embodiment, the thickness of the coating layer 140 is 3 μm to 19 μm, and the thickness of the substrate 120 is 6 μm to 30 μm. After the thickness of the coating layer 140 and the thickness of the substrate 120 meet the above conditions, the coating layer 140 can resist the shrinkage force of the substrate 120, thereby suppressing the shrinkage of the substrate 120. If the thickness of the coating layer 140 is less than 3 μm, it cannot resist the shrinkage force of the substrate 120. In some embodiments, the thickness of the coating 140 is 8 μm-10 μm, and the thickness of the substrate 120 is 6 μm-10 μm.

粘接剂143用于将大量硬质颗粒141粘接在一起形成涂层140，并使涂层140具有粘性。粘接剂143可采用具有较强的抗氧化性的材质，使得其能够在锂离子电池环境下保持更为稳定的化学性能。在一些实施例中，粘接剂143包括羧甲基纤维素、丁苯橡胶、聚偏氟乙烯、聚四氟乙烯、氟化橡胶、聚氨酯、聚丙烯醇、聚丙烯酸钠、聚醚酰胺亚或丙烯酸酯中的至少一种。The adhesive 143 is used to bond a large number of hard particles 141 together to form the coating 140 and make the coating 140 sticky. The adhesive 143 can be made of a material with strong oxidation resistance, so that it can maintain a more stable chemical performance in a lithium ion battery environment. In some embodiments, the adhesive 143 includes carboxymethyl cellulose, styrene butadiene rubber, polyvinylidene fluoride, polytetrafluoroethylene, fluorinated rubber, polyurethane, polyacryl alcohol, sodium polyacrylate, polyether amide, or At least one of acrylates.

在一些实施例中，基材120为离型基材，第一表面121为离型面，涂层140与基材120之间可发生相对滑移。当对绝缘胶带100进行针刺时，基材120相对涂层140发生滑移，而涂层140不会发生收缩。In some embodiments, the substrate 120 is a release substrate, and the first surface 121 is a release surface, and relative slippage may occur between the coating 140 and the substrate 120. When the insulating tape 100 is needle-punched, the substrate 120 slips relative to the coating 140, and the coating 140 does not shrink.

请参阅图2，在一些实施例中，绝缘胶带100还包括胶层160。胶层160设置于基材120的第二表面123，用于增加绝缘胶带100的粘性。胶层160包括压敏胶、热熔胶中的至少一种。胶层160的材质可选用现有已知任一种胶黏剂，例如聚丙烯酸类、聚氨酯类、环氧树脂类、有机硅类等单一组分，或者选用两种或两种以上的混合组分。胶层160的厚度为1μm～10μm，胶层160的粘性大于20N/m。在一些实施例中，胶层160的厚度为4μm～8μm。Please refer to FIG. 2. In some embodiments, the insulating tape 100 further includes an adhesive layer 160. The adhesive layer 160 is disposed on the second surface 123 of the substrate 120 to increase the adhesiveness of the insulating tape 100. The adhesive layer 160 includes at least one of a pressure sensitive adhesive and a hot melt adhesive. The material of the adhesive layer 160 can be any currently known adhesive, such as a single component such as polyacrylic, polyurethane, epoxy, silicone, etc., or a mixed group of two or more. point. The thickness of the adhesive layer 160 is 1 μm-10 μm, and the viscosity of the adhesive layer 160 is greater than 20 N/m. In some embodiments, the thickness of the adhesive layer 160 is 4 μm to 8 μm.

请参阅图3，在一些实施例中，胶层160设置于涂层140背离基材120的一侧。通过将胶层160设置在涂层140背离120的一侧，使涂层140夹设于胶层160与基材120中，在增加绝缘胶带100的粘性的同时，还可避免涂层140发生脱落。Please refer to FIG. 3, in some embodiments, the glue layer 160 is disposed on the side of the coating layer 140 away from the substrate 120. By arranging the adhesive layer 160 on the side of the coating 140 away from 120, the coating 140 is sandwiched between the adhesive layer 160 and the substrate 120, which increases the viscosity of the insulating tape 100 and prevents the coating 140 from falling off. .

请参阅图4，本申请一实施方式提供的电化学装置包括电芯200。电芯200包括第一极片210、第二极片220及隔膜250。隔膜250设置于第一极片210及第二极片220之间。第一极片210、隔膜250及第二极片220依次叠置并卷绕形成电芯200。本实施方式中，第一极片210为阴极极片，第二极片220为阳极极片。Please refer to FIG. 4, the electrochemical device provided by an embodiment of the present application includes a battery cell 200. The cell 200 includes a first pole piece 210, a second pole piece 220 and a diaphragm 250. The diaphragm 250 is disposed between the first pole piece 210 and the second pole piece 220. The first pole piece 210, the diaphragm 250, and the second pole piece 220 are sequentially stacked and wound to form the battery core 200. In this embodiment, the first pole piece 210 is a cathode pole piece, and the second pole piece 220 is an anode pole piece.

第一极片210包括第一集流体211、第一活性物质层213及上述绝缘胶带100。第一活性物质层213设置于第一集流体211相对的两表面。在一些实施例中，第一活性物质层213可仅设置于第一集流体211的一个表面。第一集流体211包括沿卷绕方向的第一未涂覆区214、涂覆区215及第二未涂覆区216，其中第一未涂覆区214及第二未涂覆区216均未设置第一活性物质层213，涂覆区215的至少一个表面设置有第一活性物质层213。本申请中的卷绕方向为逆时针方向。第一未涂覆区214位于电化学装置进行穿钉测试时钢钉通过的位置。绝缘胶带100设置于第一未涂覆区214，并与第一活性物质层213邻近第一未涂覆区214的一端相连接。在进行穿钉测试时，绝缘胶带100的基材120在因局部的铝阳极短路产生的局部高温而发生收缩，但涂层140中的硬质颗粒142使其在高温下不会发生收缩，使得被绝缘胶带100覆盖的第一集流体211不会裸露出来，进而防止进一步发生铝阳极短路。The first pole piece 210 includes a first current collector 211, a first active material layer 213, and the aforementioned insulating tape 100. The first active material layer 213 is disposed on two opposite surfaces of the first current collector 211. In some embodiments, the first active material layer 213 may be provided on only one surface of the first current collector 211. The first current collector 211 includes a first uncoated area 214, a coated area 215, and a second uncoated area 216 along the winding direction, wherein the first uncoated area 214 and the second uncoated area 216 are not The first active material layer 213 is provided, and at least one surface of the coating area 215 is provided with the first active material layer 213. The winding direction in this application is counterclockwise. The first uncoated area 214 is located at the position where the steel nails pass during the nail penetration test of the electrochemical device. The insulating tape 100 is disposed in the first uncoated area 214 and connected to an end of the first active material layer 213 adjacent to the first uncoated area 214. During the nail penetration test, the substrate 120 of the insulating tape 100 shrinks at the local high temperature caused by the local aluminum anode short circuit, but the hard particles 142 in the coating 140 prevent it from shrinking at high temperatures, so that The first current collector 211 covered by the insulating tape 100 will not be exposed, thereby preventing further aluminum anode short circuit.

在一些实施例中，绝缘胶带100还可设置于第二未涂覆区216并与第一活性物质层213远离第一未涂覆区214的一端相连接；或者设置于位于涂覆区215中的第一集流体211背离第一活性物质层213的一侧。需要说明的是，绝缘胶带100可设置于第一极片210上任何需要绝缘的位置处，例如极耳位置处等。In some embodiments, the insulating tape 100 may also be arranged in the second uncoated area 216 and connected to the end of the first active material layer 213 away from the first uncoated area 214; or arranged in the coated area 215 The side of the first current collector 211 facing away from the first active material layer 213. It should be noted that the insulating tape 100 can be disposed at any position on the first pole piece 210 that needs to be insulated, such as a tab position.

第二极片220包括第二集流体221和第二活性物质层223。第二活性物质层223设置于第二集流体221相对的两表面。在一些实施例中，第二极片220还可包括上述绝缘胶带100，绝缘胶带100可设置于第二极片220上任何需要绝缘的位置处。The second pole piece 220 includes a second current collector 221 and a second active material layer 223. The second active material layer 223 is disposed on two opposite surfaces of the second current collector 221. In some embodiments, the second pole piece 220 may further include the above-mentioned insulating tape 100, and the insulating tape 100 may be disposed on the second pole piece 220 where insulation is required.

在一些实施例中，第一集流体221及第二集流体221的材质均可选自Ni、Ti、Cu、Ag、Au、Pt、Fe、Co、Cr、W、Mo、Al、Mg、K、Na、Ca、Sr、Ba、Si、Ge、Sb、Pb、In、Zn及其组合物(合金)中的至少一种。In some embodiments, the materials of the first current collector 221 and the second current collector 221 can be selected from Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K , Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, In, Zn, and at least one of combinations (alloys) thereof.

在一些实施例中，第一活性物质层213包括能够吸收/释放锂(Li)的阴极活性材料，例如可以包括钴酸锂、镍钴锰酸锂、镍钴铝酸锂、锰酸锂、磷酸铁锂、磷酸钒锂、磷酸钒氧锂、磷酸铁锂、钛酸锂和富锂锰基材料；第二活性物质层223包括能够吸收/释放锂(Li)的阳极活性材料，例如可以包括碳材料、金属化合物、氧化物、硫化物、锂的氮化物例如LiN3、锂金属、与锂一起形成合金的金属和聚合物材料。In some embodiments, the first active material layer 213 includes a cathode active material capable of absorbing/releasing lithium (Li). For example, it may include lithium cobalt oxide, lithium nickel cobalt manganate, lithium nickel cobalt aluminate, lithium manganate, and phosphoric acid. Lithium iron, lithium vanadium phosphate, lithium vanadyl phosphate, lithium iron phosphate, lithium titanate, and lithium-rich manganese-based materials; the second active material layer 223 includes an anode active material capable of absorbing/releasing lithium (Li), for example, it may include carbon Materials, metal compounds, oxides, sulfides, lithium nitrides such as LiN3, lithium metal, metals that form alloys with lithium, and polymer materials.

本申请实施例以及对比例的锂离子电池的制备过程如下。The preparation process of the lithium ion battery in the examples of the application and the comparative example is as follows.

实施例1Example 1

(1)绝缘胶带的制备(1) Preparation of insulating tape

采用PI膜作为基材，将氧化铝陶瓷颗粒与羧甲基纤维素粘接剂混合后涂覆至PI膜的一侧形成涂层，在涂层背离基材的一侧涂覆聚丙烯酸酯胶形成胶层，固化后得到绝缘胶带。其中，基材的厚度为6μm，胶层的厚度为1μm，胶层的粘性为20N/m，涂层厚度为19μm，涂层中的陶瓷颗粒的质量百分比为85％。Using PI film as the substrate, mixing alumina ceramic particles and carboxymethyl cellulose adhesive and coating on one side of the PI film to form a coating, and coating polyacrylate glue on the side of the coating away from the substrate An adhesive layer is formed, and an insulating tape is obtained after curing. The thickness of the substrate is 6 μm, the thickness of the adhesive layer is 1 μm, the viscosity of the adhesive layer is 20 N/m, the coating thickness is 19 μm, and the mass percentage of ceramic particles in the coating is 85%.

(2)阴极极片的制备(2) Preparation of cathode electrode piece

将阴极活性物质钴酸锂、导电剂乙炔黑、粘结剂聚偏二氟乙烯(PVDF)按照质量比94:3:3在N-甲基吡咯烷酮溶剂体系中充分搅拌混合均匀后，涂覆于阳极集流体Al箔上，经烘干、冷压、分条，得到阳极极片。The cathode active material lithium cobalt oxide, conductive agent acetylene black, and binder polyvinylidene fluoride (PVDF) are mixed thoroughly in the N-methylpyrrolidone solvent system at a mass ratio of 94:3:3, and then coated on After drying, cold pressing and slitting on the anode current collector Al foil, anode pole pieces are obtained.

(3)阳极极片的制备(3) Preparation of anode pole piece

将阴极活性物质人造石墨、导电剂乙炔黑、粘结剂丁苯橡胶(SBR)、增稠剂羧甲基纤维素钠(CMC)按质量比96:1:1.5:1.5在去离子水溶剂体系中充分搅拌混合均匀后，涂覆于阴极集流体Cu箔上形成阴极活性物质层，将绝缘胶带贴附于Cu箔表面并与阴极活性物质层的一端相连接，得到负极极片。The cathode active material artificial graphite, conductive agent acetylene black, binder styrene butadiene rubber (SBR), thickener sodium carboxymethyl cellulose (CMC) in a deionized water solvent system at a mass ratio of 96:1:1.5:1.5 After being fully stirred and mixed uniformly, it is coated on the cathode current collector Cu foil to form a cathode active material layer, and the insulating tape is attached to the surface of the Cu foil and connected to one end of the cathode active material layer to obtain a negative electrode piece.

(4)电解液的制备(4) Preparation of electrolyte

将锂盐LiPF ₆与非水有机溶剂(碳酸乙烯酯(EC)：碳酸亚丙酯(PC)＝50:50，质量比)按照质量比8:92配制而成的溶液作为锂离子电池的电解液。 The solution prepared by lithium salt LiPF ₆ and non-aqueous organic solvent (ethylene carbonate (EC): propylene carbonate (PC) = 50:50, mass ratio) at a mass ratio of 8:92 is used as the electrolysis of lithium ion batteries liquid.

(5)锂离子电池的制备(5) Preparation of lithium ion battery

将阴极极片和阳极极片进行卷绕，阴极极片和阳极极片之间以PE隔离膜进行分离，从而制得如图4所示的电芯。将电芯置于包装壳中，注入电解液并封装，获得锂离子电池。The cathode electrode piece and the anode electrode piece are wound, and the cathode electrode piece and the anode electrode piece are separated by a PE isolation film, thereby obtaining a battery cell as shown in FIG. 4. Put the electric core in the packaging shell, inject the electrolyte and encapsulate to obtain the lithium ion battery.

实施例2Example 2

与实施例1的制备方法一致，不同的是实施例2的胶层的厚度为4μm，涂层厚度为3μm，涂层中的陶瓷颗粒的质量百分比为95％。The preparation method is consistent with the preparation method of Example 1, except that the thickness of the adhesive layer of Example 2 is 4 μm, the thickness of the coating is 3 μm, and the mass percentage of ceramic particles in the coating is 95%.

实施例3Example 3

与实施例1的制备方法一致，不同的是实施例3中采用PET膜作为基材，胶层的粘性为100N/m，涂层中的陶瓷颗粒的质量百分比为95％。The preparation method is consistent with the preparation method of Example 1, except that in Example 3, a PET film is used as the substrate, the adhesive layer has a viscosity of 100 N/m, and the mass percentage of ceramic particles in the coating is 95%.

实施例4Example 4

与实施例1的制备方法一致，不同的是实施例4中采用PET膜作为基材，胶层的厚度为4μm，胶层的粘性为100N/m。The preparation method is consistent with the preparation method of Example 1, except that in Example 4, a PET film is used as the substrate, the thickness of the adhesive layer is 4 μm, and the viscosity of the adhesive layer is 100 N/m.

实施例5Example 5

与实施例1的制备方法一致，不同的是实施例5的基材的厚度为30μm，胶层的粘性为100N/m，涂层厚度为3μm。The preparation method is consistent with the preparation method of Example 1, except that the thickness of the substrate of Example 5 is 30 μm, the viscosity of the adhesive layer is 100 N/m, and the coating thickness is 3 μm.

实施例6Example 6

与实施例5的制备方法一致，不同的是实施例6的胶层的厚度为4μm，涂层厚度为19μm，涂层中的陶瓷颗粒的质量百分比为95％。The preparation method is consistent with the preparation method of Example 5, except that the thickness of the adhesive layer of Example 6 is 4 μm, the thickness of the coating is 19 μm, and the mass percentage of ceramic particles in the coating is 95%.

实施例7Example 7

与实施例5的制备方法一致，不同的是实施例7中采用PET作为的基材，胶层的粘性为20N/m，涂层的厚度为19μm，涂层中的陶瓷颗粒的质量百分比为95％。The preparation method is the same as in Example 5, except that in Example 7, PET is used as the substrate. The adhesive layer has a viscosity of 20N/m, the thickness of the coating is 19μm, and the mass percentage of ceramic particles in the coating is 95 %.

实施例8Example 8

与实施例5的制备方法一致，不同的是实施例8中采用PET作为的基材，胶层的厚度为4μm，胶层的粘性为20N/m。The preparation method is consistent with the preparation method of Example 5, except that PET is used as the substrate in Example 8, the thickness of the adhesive layer is 4 μm, and the viscosity of the adhesive layer is 20 N/m.

实施例9Example 9

与实施例5的制备方法一致，不同的是实施例7中采用PET作为的基材，涂层中的陶瓷颗粒的质量百分比为80％。The preparation method is the same as that of Example 5, except that PET is used as the substrate in Example 7, and the mass percentage of ceramic particles in the coating is 80%.

实施例10Example 10

与实施例5的制备方法一致，不同的是实施例7中采用PET作为的基材，胶层的粘性为20N/m，涂层中的陶瓷颗粒的质量百分比为75％。The preparation method is consistent with the preparation method of Example 5, except that in Example 7 PET is used as the substrate, the adhesive layer has a viscosity of 20 N/m, and the mass percentage of ceramic particles in the coating is 75%.

实施例11Example 11

与实施例1的制备方法一致，不同的是实施例11的绝缘胶带的制备方法为：It is consistent with the preparation method of Example 1, except that the preparation method of the insulating tape of Example 11 is:

采用PI膜作为基材，将氧化铝陶瓷颗粒与羧甲基纤维素粘接剂混合后涂覆至PT膜的一侧形成涂层，在基材背离涂层的一侧涂覆聚丙烯酸酯胶形成胶层，固化后得到绝缘胶带。其中，基材的厚度为6μm，胶层的厚度为1μm，胶层的粘性为100N/m，涂层厚度为19μm，涂层中的陶瓷颗粒的质量百分比为95％。Using PI film as the substrate, mixing alumina ceramic particles and carboxymethyl cellulose adhesive and coating on one side of the PT film to form a coating, and coating polyacrylate glue on the side of the substrate facing away from the coating An adhesive layer is formed, and an insulating tape is obtained after curing. The thickness of the substrate is 6 μm, the thickness of the adhesive layer is 1 μm, the viscosity of the adhesive layer is 100 N/m, the coating thickness is 19 μm, and the mass percentage of ceramic particles in the coating is 95%.

实施例12Example 12

与实施例11的制备方法一致，不同的是实施例12中采用PET作为的基材，胶层的粘性为20N/m，涂层的厚度为3μm，涂层中的陶瓷颗粒的质量百分比为85％。The preparation method is consistent with the preparation method of Example 11. The difference is that in Example 12, PET is used as the substrate. The adhesive layer has a viscosity of 20N/m, the thickness of the coating is 3μm, and the mass percentage of ceramic particles in the coating is 85. %.

实施例13Example 13

与实施例11的制备方法一致，不同的是实施例13中胶层的厚度为4μm，涂层的厚度为3μm，涂层中的陶瓷颗粒的质量百分比为85％。The preparation method is consistent with the preparation method of Example 11, except that the thickness of the glue layer in Example 13 is 4 μm, the thickness of the coating is 3 μm, and the mass percentage of ceramic particles in the coating is 85%.

实施例14Example 14

与实施例11的制备方法一致，不同的是实施例14中采用PET 膜作为基材，胶层的厚度为4μm，胶层的粘性为20N/m。The preparation method is consistent with the preparation method of Example 11, except that in Example 14, a PET film is used as the substrate, the thickness of the adhesive layer is 4 μm, and the viscosity of the adhesive layer is 20 N/m.

实施例15Example 15

与实施例11的制备方法一致，不同的是实施例15中基材的厚度为30μm，胶层的粘性为20N/m，涂层的厚度为3μm。The preparation method is consistent with the preparation method of Example 11, except that the thickness of the substrate in Example 15 is 30 μm, the viscosity of the adhesive layer is 20 N/m, and the thickness of the coating layer is 3 μm.

实施例16Example 16

与实施例15的制备方法一致，不同的是实施例16中采用PET膜作为基材，胶层的厚度为4μm，胶层的粘性为100N/m。The preparation method is consistent with the preparation method of Example 15, except that in Example 16, a PET film is used as the substrate, the thickness of the adhesive layer is 4 μm, and the viscosity of the adhesive layer is 100 N/m.

实施例17Example 17

与实施例15的制备方法一致，不同的是实施例17中采用PET膜作为基材，胶层的粘性为100N/m，涂层的厚度为19μm，涂层中陶瓷颗粒的质量百分比为85％。The preparation method is the same as in Example 15, except that in Example 17, PET film is used as the substrate. The adhesive layer has a viscosity of 100N/m, the thickness of the coating is 19μm, and the mass percentage of ceramic particles in the coating is 85%. .

实施例18Example 18

与实施例15的制备方法一致，不同的是实施例17中胶层的厚度为1μm，涂层的厚度为19μm，涂层中陶瓷颗粒的质量百分比为85％。The preparation method is consistent with the preparation method of Example 15, except that the thickness of the glue layer in Example 17 is 1 μm, the thickness of the coating is 19 μm, and the mass percentage of ceramic particles in the coating is 85%.

实施例19Example 19

与实施例13的制备方法一致，不同的是实施例19涂层中的陶瓷颗粒的质量百分比为30％。The preparation method is consistent with the preparation method of Example 13, except that the mass percentage of the ceramic particles in the coating of Example 19 is 30%.

实施例20Example 20

与实施例19的制备方法一致，不同的是实施例20涂层中的陶瓷颗粒的质量百分比为99％。The preparation method is consistent with the preparation method of Example 19, except that the mass percentage of the ceramic particles in the coating of Example 20 is 99%.

实施例21-23Examples 21-23

与实施例19的制备方法一致，不同的是实施例21-23涂层厚度、胶层厚度和陶瓷颗粒的质量百分比不同。The preparation method is consistent with the preparation method of Example 19, except that the thickness of the coating layer, the thickness of the glue layer and the mass percentage of the ceramic particles are different in Examples 21-23.

对比例1Comparative example 1

与实施例12的制备方法一致，不同的是对比例1的涂层的厚度为19μm，涂层中的陶瓷颗粒的质量百分比为0％。The preparation method is consistent with the preparation method of Example 12, except that the thickness of the coating of Comparative Example 1 is 19 μm, and the mass percentage of ceramic particles in the coating is 0%.

对比例2Comparative example 2

与对比例1的制备方法一致，不同的是对比例2的胶层的粘性为100N/m。It is consistent with the preparation method of Comparative Example 1, except that the adhesive layer of Comparative Example 2 has a viscosity of 100 N/m.

对比例3-6Comparative example 3-6

与对比例1的制备方法一致，不同的是对比例3-6的涂层厚度、胶层厚度和陶瓷颗粒的质量百分比不同。The preparation method is consistent with the preparation method of Comparative Example 1, except that the thickness of the coating layer, the thickness of the adhesive layer and the mass percentage of ceramic particles of Comparative Examples 3-6 are different.

对实施例1-23及对比例1-6的锂离子电池进行穿钉测试。穿钉测试的方法为：在25℃下，将锂离子电池充满电，然后对锂离子电池进行穿钉测试，其中，穿钉速率为100mm/s，钢钉的直径为3mm，穿钉测试以锂离子电池不***、不起火即为通过，每组测试10个锂离子电池，计算锂离子电池的穿钉测试通过率。实施例1-23及对比例1-6的实验参数和测量结果如下表1所示。The nail penetration test was performed on the lithium ion batteries of Examples 1-23 and Comparative Examples 1-6. The nail penetration test method is: fully charge the lithium-ion battery at 25°C, and then carry out the nail penetration test on the lithium ion battery. The nail penetration rate is 100mm/s, the diameter of the steel nail is 3mm, and the nail penetration test is If the lithium-ion battery does not explode or does not catch fire, it will pass. Each group of 10 lithium-ion batteries is tested, and the pass rate of the lithium-ion battery nail penetration test is calculated. The experimental parameters and measurement results of Examples 1-23 and Comparative Examples 1-6 are shown in Table 1 below.

表1Table 1

从表1的测试结果可知，锂离子电池的穿钉结果与陶瓷颗粒的质量百分比密切相关。由实施例1-8及实施例11-18可知，当陶瓷颗粒的质量百分比大于85％时，穿钉通过率达到100％。由实施例7-10及对比例1-2可知，当陶瓷颗粒的质量百分比小于85％时，随着陶瓷颗粒的质量百分比的降低，穿钉通过率也会降低。From the test results in Table 1, it can be seen that the nail penetration results of lithium-ion batteries are closely related to the mass percentage of ceramic particles. It can be seen from Examples 1-8 and 11-18 that when the mass percentage of ceramic particles is greater than 85%, the nail penetration rate reaches 100%. It can be seen from Examples 7-10 and Comparative Examples 1-2 that when the mass percentage of ceramic particles is less than 85%, as the mass percentage of ceramic particles decreases, the nail penetration rate will also decrease.

以上所揭露的仅为本申请较佳实施方式而已，当然不能以此来限定本申请，因此依本申请所作的等同变化，仍属本申请所涵盖的范围。What has been disclosed above is only the preferred embodiments of this application, which of course cannot be used to limit this application. Therefore, equivalent changes made in accordance with this application still fall within the scope of this application.

Claims

一种绝缘胶带，其特征在于，包括：An insulating tape, characterized in that it comprises:

基材，包括相对设置的第一表面及第二表面；The substrate includes a first surface and a second surface that are arranged oppositely;

涂层，设置于所述第一表面，所述涂层包括硬质颗粒及粘接剂，所述硬质颗粒的重量占所述涂层的总重量的30％～99％，硬质颗粒的硬度≥3莫氏硬度。The coating layer is arranged on the first surface, the coating layer includes hard particles and a binder, and the weight of the hard particles accounts for 30% to 99% of the total weight of the coating. Hardness ≥ 3 Mohs hardness.
如权利要求1所述的绝缘胶带，其特征在于，所述绝缘胶带还包括胶层，所述胶层设置于所述第二表面或所述涂层背离所述基材的一侧。8. The insulating tape of claim 1, wherein the insulating tape further comprises an adhesive layer, and the adhesive layer is disposed on the second surface or the side of the coating away from the substrate.
如权利要求2所述的绝缘胶带，其特征在于，所述胶层的厚度为1μm～10μm。3. The insulating tape of claim 2, wherein the adhesive layer has a thickness of 1 μm to 10 μm.
如权利要求1所述的绝缘胶带，其特征在于，所述硬质颗粒的重量占所述涂层的总重量的85％～99％。The insulating tape of claim 1, wherein the weight of the hard particles accounts for 85% to 99% of the total weight of the coating.
如权利要求1所述的绝缘胶带，其特征在于，所述硬质颗粒包括陶瓷颗粒，所述陶瓷颗粒包括氧化铝、勃姆石、氢氧化镁、硫酸钡、硅酸钙或二氧化钛中的至少一种。The insulating tape of claim 1, wherein the hard particles include ceramic particles, and the ceramic particles include at least one of alumina, boehmite, magnesium hydroxide, barium sulfate, calcium silicate, or titanium dioxide. A sort of.
如权利要求1所述的绝缘胶带，其特征在于，所述涂层的厚度为3μm～19μm。The insulating tape of claim 1, wherein the thickness of the coating is 3 μm to 19 μm.
如权利要求1所述的绝缘胶带，其特征在于，所述基材的厚度为6μm～30μm。The insulating tape according to claim 1, wherein the thickness of the base material is 6 μm to 30 μm.
如权利要求1所述的绝缘胶带，其特征在于，所述粘接剂包括羧甲基纤维素、丁苯橡胶、聚偏氟乙烯、聚四氟乙烯、氟化橡胶、聚氨酯、聚丙烯醇、聚丙烯酸钠、聚醚酰胺亚或丙烯酸酯中的至少一种。The insulating tape of claim 1, wherein the adhesive comprises carboxymethyl cellulose, styrene butadiene rubber, polyvinylidene fluoride, polytetrafluoroethylene, fluorinated rubber, polyurethane, polyacryl alcohol, At least one of sodium polyacrylate, polyether amide sub or acrylate.
一种极片，其特征在于，包括：A pole piece, characterized in that it comprises:

集流体；Current collector

活性物质层，设置于所述集流体的至少一个表面；以及The active material layer is provided on at least one surface of the current collector; and

如权利要求1至8中任一项所述的绝缘胶带，所述绝缘胶带设置于所述集流体上并与所述活性物质层的至少一个端部相连接。The insulating tape according to any one of claims 1 to 8, which is provided on the current collector and connected to at least one end of the active material layer.
一种电化学装置，包括电芯，所述电芯包括第一极片、第二极片及设置于所述第一极片与所述第二极片之间的隔膜，其特征在于，所述第一极片及所述第二极片中至少一者为权利要求9所述的极片。An electrochemical device includes a battery cell, the battery cell includes a first pole piece, a second pole piece, and a diaphragm arranged between the first pole piece and the second pole piece, and is characterized in that: At least one of the first pole piece and the second pole piece is the pole piece of claim 9.