CN101894937A - Lithium ion battery and positive plate thereof - Google Patents
Lithium ion battery and positive plate thereof Download PDFInfo
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- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 2
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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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Abstract
本发明公开了一种锂离子电池正极片，其包括正极集流体与分布在正极集流体上的正极膜片和端子，其中，正极集流体未被正极膜片和端子覆盖的表面上分布有可提高正极集流体表面电阻的绝缘保护层。本发明锂离子电池正极片通过绝缘保护层对未被正极膜片和端子覆盖的正极集流体进行保护，可以增大正极集流体与负极膜片接触时的欧姆电阻，提高锂离子电池的安全特性。此外，本发明还公开了一种使用前述锂离子电池正极片的锂离子电池。
The present invention discloses a positive electrode sheet for a lithium-ion battery, which includes a positive electrode current collector, a positive electrode membrane and a terminal distributed on the positive electrode current collector, wherein an insulating protective layer that can increase the surface resistance of the positive electrode current collector is distributed on the surface of the positive electrode current collector that is not covered by the positive electrode membrane and the terminal. The positive electrode sheet for a lithium-ion battery of the present invention protects the positive electrode current collector that is not covered by the positive electrode membrane and the terminal through the insulating protective layer, which can increase the ohmic resistance when the positive electrode current collector contacts the negative electrode membrane, thereby improving the safety characteristics of the lithium-ion battery. In addition, the present invention also discloses a lithium-ion battery using the above-mentioned positive electrode sheet for a lithium-ion battery.
Description
技术领域technical field
本发明涉及一种锂离子电池，尤其是一种具有良好安全性能的锂离子电池及其正极片。The invention relates to a lithium ion battery, in particular to a lithium ion battery with good safety performance and its positive electrode sheet.
背景技术Background technique
随着现代电子技术的发展，各种便携设备如摄像机、数码相机、笔记本电脑、MP4、便携式DVD等得到了广泛使用。锂离子电池作为一种能量密度高、环境友好的电池，因具有重量轻、储能大、功率大、寿命长、自放电系数小、温度适应范围宽泛等优点而逐渐受到人们的青睐，被广泛应用于各种便携设备中。With the development of modern electronic technology, various portable devices such as video cameras, digital cameras, notebook computers, MP4, portable DVD, etc. have been widely used. As a battery with high energy density and environmental friendliness, lithium-ion batteries are gradually favored by people because of their advantages such as light weight, large energy storage, high power, long life, small self-discharge coefficient, and wide temperature range. Used in various portable devices.
锂离子电池具有特殊的电化学体系，一般使用碳酸酯作为电解液溶剂，碳酸酯的易燃特性使得锂离子电池在为人们提供便利的同时也带来了一定的安全隐患。过充和内短路是威胁锂离子电池安全性能的两个主要问题，通过使用外接保护电路和防过充电解液添加剂可在很大程度上解决锂离子电池的过充安全问题，然而由于内短路的不可探测性，其依然是威胁锂离子电池安全的一个重要问题。Lithium-ion batteries have a special electrochemical system. Generally, carbonates are used as electrolyte solvents. The flammability of carbonates makes lithium-ion batteries bring convenience to people but also bring certain safety hazards. Overcharge and internal short circuit are two main problems that threaten the safety performance of lithium-ion batteries. The overcharge safety problem of lithium-ion batteries can be solved to a large extent by using external protection circuits and anti-overcharge electrolyte additives. However, due to internal short-circuit The undetectability of lithium-ion batteries remains an important issue threatening the safety of lithium-ion batteries.
为了实现制造工艺的便利，锂离子电池正极片通常会保留部分未被正极膜片和端子覆盖的正极集流体，当锂离子电池被非正当使用时，如受到挤压、撞击或被尖锐物品刺穿等机械破坏时，极易导致裸露的正极集流体与负极膜片接触而造成短路。此时，短路形成的短路电阻小，短路电流大，短路点在短时间内温度骤然升高，可能导致电池热失控，容易引发安全问题。In order to facilitate the manufacturing process, the positive electrode sheet of the lithium-ion battery usually retains a part of the positive electrode collector not covered by the positive electrode film and the terminal. When the lithium-ion battery is used improperly, such as being squeezed, hit or pierced by sharp objects When wearing and other mechanical damage, it is very easy to cause the exposed positive electrode current collector to contact the negative electrode diaphragm and cause a short circuit. At this time, the short circuit resistance formed by the short circuit is small, the short circuit current is large, and the temperature of the short circuit point rises suddenly in a short period of time, which may lead to thermal runaway of the battery and easily cause safety problems.
实验证明，锂离子电池的正极集流体(通常为铝箔)与负极膜片接触而引起的内短路是锂离子电池最危险的短路方式，容易引起电池起火甚至爆炸。为了避免此种内短路引发的安全问题，现有技术中采用了以下几种方式来提高电池的安全性。Experiments have proved that the internal short circuit caused by the contact between the positive electrode current collector (usually aluminum foil) and the negative electrode diaphragm of lithium ion batteries is the most dangerous short circuit mode of lithium ion batteries, which can easily cause the battery to catch fire or even explode. In order to avoid the safety problem caused by such internal short circuit, the following methods are adopted in the prior art to improve the safety of the battery.
如于2007年2月2日申请的中国发明专利申请CN 200710026671.5号所揭示：在锂离子电池的负极膜片表面覆盖一层金属氧化物膜，该层金属氧化物膜具有提高负极膜片表面电阻和降低热传导速率的作用，可以有效提高电池的短路安全特性。同时，该层金属氧化物膜采用多孔结构，锂离子可顺利穿过并实现电池的充放电，保证了电池的电化学性能。As disclosed in the Chinese invention patent application CN 200710026671.5 filed on February 2, 2007: a layer of metal oxide film is covered on the surface of the negative electrode diaphragm of the lithium-ion battery, and this layer of metal oxide film has the ability to improve the surface resistance of the negative electrode diaphragm. And the effect of reducing the heat conduction rate can effectively improve the short-circuit safety characteristics of the battery. At the same time, the metal oxide film of this layer adopts a porous structure, and lithium ions can pass through smoothly to realize the charge and discharge of the battery, ensuring the electrochemical performance of the battery.
又如于2007年4月25日申请的中国发明专利申请CN 200710027688.2号所揭示：可在负极膜片中掺杂金属氧化物颗粒或对石墨颗粒进行表面包覆，以增大负极膜片的体相电阻，降低短路电流，减小短路点的温升，提高电池的短路安全特性。Another example is disclosed in the Chinese invention patent application CN 200710027688.2 filed on April 25, 2007: metal oxide particles can be doped in the negative electrode diaphragm or the surface of graphite particles can be coated to increase the volume of the negative electrode diaphragm. phase resistance, reduce the short-circuit current, reduce the temperature rise of the short-circuit point, and improve the short-circuit safety characteristics of the battery.
再如于2008年7月24日申请的中国发明专利申请CN 200810029727.7号所揭示：可对正极膜片进行多层涂布，以增强正极膜片与正极集流体的粘结，增大短路电阻，改善电池的短路安全特性。Another example is disclosed in the Chinese invention patent application CN 200810029727.7 filed on July 24, 2008: the positive electrode diaphragm can be coated with multiple layers to enhance the bonding between the positive electrode diaphragm and the positive electrode current collector and increase the short-circuit resistance. Improve the short-circuit safety characteristics of the battery.
本发明旨在通过使用绝缘保护层对未被正极膜片和端子遮盖的正极集流体进行保护，增大正极集流体与负极膜片短路时的接触电阻，降低短路电流和短路点温升，提高锂离子电池的短路安全特性。The present invention aims to protect the positive current collector not covered by the positive diaphragm and the terminal by using an insulating protective layer, increase the contact resistance when the positive current collector and the negative diaphragm are short-circuited, reduce the short-circuit current and the temperature rise of the short-circuit point, and improve the Short-circuit safety features of lithium-ion batteries.
发明内容Contents of the invention
本发明的一个目的在于：提供一种具有良好安全性能的锂离子电池正极片。One object of the present invention is to provide a lithium ion battery positive electrode sheet with good safety performance.
为了实现上述发明目的，本发明提供了一种锂离子电池正极片，其包括正极集流体和分布在正极集流体上的正极膜片和端子，其中，正极集流体未被正极膜片和端子覆盖的表面上分布有可提高正极集流体表面电阻的绝缘保护层。In order to achieve the above-mentioned purpose of the invention, the present invention provides a positive electrode sheet of a lithium ion battery, which includes a positive electrode collector and a positive electrode diaphragm and a terminal distributed on the positive electrode collector, wherein the positive electrode collector is not covered by the positive electrode diaphragm and the terminal An insulating protective layer that can increase the surface resistance of the positive current collector is distributed on the surface of the positive electrode.
相对于现有技术，本发明锂离子电池正极片至少具有以下优点：正极集流体未被正极膜片和端子覆盖的表面上分布有可提高正极集流体表面电阻的绝缘保护层，通过绝缘保护层对正极片裸露的正极集流体进行保护，可增大正极集流体与负极膜片接触时的欧姆电阻，提高锂离子电池的安全特性。Compared with the prior art, the lithium-ion battery positive sheet of the present invention has at least the following advantages: an insulating protective layer that can improve the surface resistance of the positive electrode current collector is distributed on the surface of the positive electrode current collector that is not covered by the positive electrode diaphragm and the terminal, and the insulating protective layer is distributed through the insulating protective layer Protecting the exposed positive current collector of the positive electrode sheet can increase the ohmic resistance when the positive electrode current collector is in contact with the negative electrode diaphragm, and improve the safety characteristics of the lithium-ion battery.
作为本发明锂离子电池正极片的一种改进，所述绝缘保护层为聚合物涂层。As an improvement of the positive electrode sheet of the lithium ion battery of the present invention, the insulating protective layer is a polymer coating.
作为本发明锂离子电池正极片的一种改进，所述聚合物涂层中的聚合物选自丁苯橡胶、丁腈橡胶、羧基丁腈橡胶、羧基丁苯橡胶、氯丁橡胶、环氧胶、聚硅氧烷胶、聚氨酯胶、脲醛树脂胶、酚醛树脂胶、聚丁烯、聚丙烯、聚偏氟乙烯、聚酰亚胺、聚乙酸乙烯酯、聚丙烯酸酯或其组合。As an improvement of the lithium ion battery positive electrode sheet of the present invention, the polymer in the polymer coating is selected from styrene-butadiene rubber, nitrile butadiene rubber, carboxylated nitrile butadiene rubber, carboxylated styrene butadiene rubber, neoprene, epoxy glue , polysiloxane glue, polyurethane glue, urea-formaldehyde resin glue, phenolic resin glue, polybutene, polypropylene, polyvinylidene fluoride, polyimide, polyvinyl acetate, polyacrylate or combinations thereof.
作为本发明锂离子电池正极片的一种改进，所述绝缘保护层为绝缘胶纸层。As an improvement to the positive electrode sheet of the lithium ion battery of the present invention, the insulating protective layer is an insulating adhesive paper layer.
作为本发明锂离子电池正极片的一种改进，所述绝缘保护层为金属氧化物颗粒涂层。As an improvement to the positive electrode sheet of the lithium ion battery of the present invention, the insulating protection layer is a coating of metal oxide particles.
作为本发明锂离子电池正极片的一种改进，所述金属氧化物涂层中的金属氧化物颗粒选自三氧化二铝、二氧化钛、氧化锌、氧化镁或其组合。As an improvement to the positive electrode sheet of the lithium ion battery of the present invention, the metal oxide particles in the metal oxide coating are selected from aluminum oxide, titanium dioxide, zinc oxide, magnesium oxide or combinations thereof.
作为本发明锂离子电池正极片的一种改进，所述绝缘保护层为二氧化硅颗粒涂层。As an improvement of the positive electrode sheet of the lithium ion battery of the present invention, the insulating protection layer is a silicon dioxide particle coating.
作为本发明锂离子电池正极片的一种改进，所述正极集流体为铝箔。As an improvement of the positive electrode sheet of the lithium ion battery of the present invention, the positive electrode current collector is aluminum foil.
本发明的另一目的在于：提供一种具有良好安全性能的锂离子电池。Another object of the present invention is to provide a lithium ion battery with good safety performance.
为了实现上述发明目的，本发明提供了一种锂离子电池，其包括正极片、负极片、间隔于正极片和负极片之间的隔离膜，以及电解液，其中，正极片为前述锂离子电池正极片。In order to achieve the above-mentioned purpose of the invention, the present invention provides a lithium ion battery, which includes a positive electrode sheet, a negative electrode sheet, a separator spaced between the positive electrode sheet and the negative electrode sheet, and an electrolyte, wherein the positive electrode sheet is the aforementioned lithium ion battery Positive sheet.
附图说明Description of drawings
下面结合附图和具体实施方式，详细说明本发明锂离子电池及其正极片，其中：The following describes the lithium ion battery and its positive electrode sheet of the present invention in detail in conjunction with the accompanying drawings and specific embodiments, wherein:
图1所示为本发明锂离子电池正极片的结构示意图。FIG. 1 is a schematic structural view of a positive electrode sheet of a lithium-ion battery according to the present invention.
图2所示为本发明锂离子电池实施例1至3和比较例锂离子电池在钉刺实验中的电压变化曲线。FIG. 2 shows the voltage variation curves of Li-ion batteries of Examples 1 to 3 of the present invention and Li-ion batteries of Comparative Example in the nailing test.
图3所示为本发明锂离子电池实施例1至3和比较例锂离子电池在钉刺实验中的表面温度变化曲线。FIG. 3 shows the surface temperature variation curves of Li-ion batteries of Examples 1 to 3 of the present invention and Li-ion batteries of Comparative Example in the nailing test.
具体实施方式Detailed ways
下面结合实施例和附图，详细说明本发明锂离子电池及其正极片，但本发明的实施例不限于此。The lithium ion battery and its positive electrode sheet of the present invention will be described in detail below with reference to the embodiments and drawings, but the embodiments of the present invention are not limited thereto.
锂离子电池正极片的制备Preparation of positive electrode sheets for lithium-ion batteries
实施例1本发明锂离子电池正极片的制备分两步，第一步，制备普通锂离子电池正极片：将正极活性材料钴酸锂、粘结剂聚偏二氟乙烯(PVDF)、导电剂(导电碳Super-P)在分散剂N，N-二甲基吡咯烷酮(NMP)中混合均匀，得到均一、稳定的正极浆料；然后，将正极浆料均匀地涂布在正极集流体铝箔上，经充分干燥得到普通锂离子电池正极片。第二步，对第一步获得的正极片进行绝缘保护处理：首先，将金属氧化物颗粒与粘结剂丁苯橡胶乳液(SBR)按照一定的重量比溶解在分散剂水中，获得均一、稳定的浆料；然后，采用涂布或浸蘸的方式将浆料覆盖在正极片裸露的正极集流体铝箔上，干燥后得到具有绝缘保护层的正极片。在本实施例中，金属氧化物颗粒可以根据需要选自Al2O3、MgO、ZnO、TiO2或其组合。但是，根据本发明的其他实施例，绝缘保护层也可以是非金属氧化物SiO2颗粒涂层。Example 1 The preparation of the lithium ion battery cathode sheet of the present invention is divided into two steps. The first step is to prepare the ordinary lithium ion battery cathode sheet: the positive electrode active material lithium cobaltate, the binder polyvinylidene fluoride (PVDF), and the conductive agent (Conductive carbon Super-P) is uniformly mixed in the dispersant N, N-dimethylpyrrolidone (NMP) to obtain a uniform and stable positive electrode slurry; then, the positive electrode slurry is evenly coated on the positive electrode current collector aluminum foil , after fully drying to obtain common lithium-ion battery positive sheet. The second step is to insulate and protect the positive electrode sheet obtained in the first step: first, dissolve the metal oxide particles and the binder styrene-butadiene rubber emulsion (SBR) in the dispersant water according to a certain weight ratio to obtain a uniform and stable The slurry; then, the slurry is covered on the aluminum foil of the positive electrode collector exposed on the positive electrode sheet by coating or dipping, and the positive electrode sheet with an insulating protective layer is obtained after drying. In this embodiment, the metal oxide particles may be selected from Al 2 O 3 , MgO, ZnO, TiO 2 or combinations thereof as required. However, according to other embodiments of the present invention, the insulating protection layer may also be a coating of non-metal oxide SiO 2 particles.
实施例2锂离子电池正极片的制备同样分两步，第一步制备普通锂离子电池正极片与实施例1相同，不再赘述。与实施例1不同之处在于，在实施例2的第二步中，采用聚合物涂层对裸露的正极集流体铝箔进行保护：首先，将聚合物粉料(或乳液)与适当的溶剂(或分散剂)混合均匀获得相应的溶液(或分散液)；然后，通过涂布或浸蘸方式将此溶液(或分散液)覆盖在正极片裸露的正极集流体铝箔上，干燥后得到具有绝缘聚合物涂层保护的正极片。根据需要，聚合物可以选自丁苯橡胶、丁腈橡胶、羧基丁腈橡胶、羧基丁苯橡胶、氯丁橡胶、环氧胶、聚硅氧烷胶、聚氨酯胶、脲醛树脂胶、酚醛树脂胶、聚丁烯、聚丙烯、聚偏氟乙烯、聚酰亚胺、聚乙酸乙烯酯、聚丙烯酸酯或其组合。Example 2 The preparation of the positive electrode sheet of the lithium-ion battery is also divided into two steps. The first step of preparing the positive electrode sheet of the ordinary lithium-ion battery is the same as that of Example 1, and will not be repeated here. The difference from Example 1 is that in the second step of Example 2, the exposed positive electrode current collector aluminum foil is protected by a polymer coating: first, the polymer powder (or emulsion) is mixed with a suitable solvent ( or dispersant) to obtain the corresponding solution (or dispersion); then, this solution (or dispersion) is covered by coating or dipping on the aluminum foil of the positive electrode collector exposed on the positive electrode sheet, and after drying, an insulating Positive electrode sheet protected by polymer coating. According to needs, the polymer can be selected from styrene-butadiene rubber, nitrile rubber, carboxylated nitrile rubber, carboxylated styrene-butadiene rubber, neoprene rubber, epoxy glue, polysiloxane glue, polyurethane glue, urea-formaldehyde resin glue, phenolic resin glue , polybutylene, polypropylene, polyvinylidene fluoride, polyimide, polyvinyl acetate, polyacrylate, or combinations thereof.
实施例3锂离子电池正极片的制备同样分两步，第一步制备普通锂离子电池正极片与实施例1相同，不再赘述。与实施例1不同之处在于，在实施例3的第二步中，采用绝缘胶纸对裸露的正极集流体铝箔进行保护。在正极片裸露的正极集流体铝箔上使用绝缘胶纸进行覆盖，同样可以实现对裸露的正极集流体铝箔的绝缘保护。相对于本发明实施例1和实施例2，本发明实施例3更易于实现。Example 3 The preparation of the positive electrode sheet of the lithium-ion battery is also divided into two steps. The first step of preparing the positive electrode sheet of the ordinary lithium-ion battery is the same as that of Example 1, and will not be repeated. The difference from Example 1 is that in the second step of Example 3, insulating adhesive tape is used to protect the exposed positive electrode current collector aluminum foil. Covering the exposed positive electrode collector aluminum foil on the positive electrode sheet with insulating tape can also achieve insulation protection for the exposed positive electrode current collector aluminum foil. Compared with Embodiment 1 and Embodiment 2 of the present invention, Embodiment 3 of the present invention is easier to implement.
图1所示为根据本发明实施例1至3获得的本发明锂离子电池正极片10的结构示意图，其包括：正极集流体铝箔20、分布在正极集流体铝箔20表面上的正极膜片30和绝缘保护层40，其中，绝缘保护层40附着于锂离子电池正极片10裸露的正极集流体铝箔20上，即未被正极膜片30和端子(未图示)覆盖的正极集流体铝箔20的表面上。Figure 1 is a schematic structural view of the
锂离子电池的制备Preparation of lithium-ion batteries
将根据上述实施例1至3获得的锂离子电池正极片与隔离膜、含有负极活性材料的负极片经过卷绕、入壳、注液、封装、化成、排气、容量测试和老化等工序分别获得本发明锂离子电池实施例1至3。其中，正极膜片中的正极活性材料为钴酸锂，负极片中的负极活性材料为石墨，隔离膜为PP/PE/PP三层复合材质多孔膜，电解液为含1mol/L LiPF6的碳酸酯溶液。The lithium-ion battery positive electrode sheet, separator, and negative electrode sheet containing the negative electrode active material obtained according to the above-mentioned Examples 1 to 3 are subjected to processes such as winding, shelling, liquid injection, packaging, formation, exhaust, capacity testing, and aging. Examples 1 to 3 of the lithium ion battery of the present invention were obtained. Among them, the positive electrode active material in the positive electrode diaphragm is lithium cobalt oxide, the negative electrode active material in the negative electrode sheet is graphite, the separator is a PP/PE/PP three-layer composite porous film, and the electrolyte is carbonic acid containing 1mol/L LiPF6 ester solution.
作为比较，将本发明锂离子电池正极片的实施例1中第一步制得的普通锂离子电池正极片与隔离膜、含有负极活性材料的负极片经过卷绕、入壳、注液、封装、化成、排气、容量测试和老化等工序分别获得比较例锂离子电池。其中，正极膜片中的正极活性材料为钴酸锂，负极片中的负极活性材料为石墨，隔离膜为PP/PE/PP三层复合材质多孔膜，电解液为含1mol/L LiPF6的碳酸酯溶液。As a comparison, the ordinary lithium ion battery positive electrode sheet and the separator and the negative electrode sheet containing the negative electrode active material prepared in the first step in the embodiment 1 of the lithium ion battery positive electrode sheet of the present invention are wound, put into the shell, injected, and packaged. , forming, exhausting, capacity testing, aging and other processes to obtain comparative lithium ion batteries respectively. Among them, the positive electrode active material in the positive electrode diaphragm is lithium cobalt oxide, the negative electrode active material in the negative electrode sheet is graphite, the separator is a PP/PE/PP three-layer composite porous film, and the electrolyte is carbonic acid containing 1mol/L LiPF6 ester solution.
用钉刺测试模拟锂离子电池的内短路，结果表明：使用金属氧化物涂层、聚合物涂层或绝缘胶纸层保护正极片裸露的正极集流体铝箔的锂离子电池，均能够以较低的温度(＜70℃)通过钉刺测试，不会引发安全问题，图2和图3分别给出了本发明锂离子电池实施例1至3和比较例锂离子电池在钉刺实验中的电压和表面温度变化曲线。The internal short circuit of the lithium-ion battery was simulated by the nail-puncture test. The results showed that the lithium-ion battery using metal oxide coating, polymer coating or insulating adhesive paper layer to protect the positive electrode sheet's exposed positive electrode current collector aluminum foil can operate at a lower rate. The temperature (<70°C) passed the nail penetration test and would not cause safety problems. Figure 2 and Figure 3 respectively show the voltages of the lithium ion battery examples 1 to 3 of the present invention and the lithium ion battery of the comparative example in the nail penetration test and surface temperature curves.
结合上述对各个实施例的详细描述可以看出，本发明锂离子电池正极片中，正极集流体未被正极膜片和端子覆盖的表面上分布有可提高正极集流体表面电阻的绝缘保护层。当采用上述正极片的锂离子电池发生因正极集流体与负极膜片相接触引起的内短路时，短路点的欧姆接触电阻大，短路电流密度小，短路点的温升较低，降低了电池起火爆炸的危险，可有效改善锂离子电池的短路安全特性。It can be seen from the above detailed description of each embodiment that in the positive electrode sheet of the lithium ion battery of the present invention, the surface of the positive electrode collector not covered by the positive electrode diaphragm and the terminal is distributed with an insulating protective layer that can increase the surface resistance of the positive electrode collector. When the lithium-ion battery using the above-mentioned positive electrode sheet has an internal short circuit caused by the contact between the positive electrode current collector and the negative electrode diaphragm, the ohmic contact resistance at the short circuit point is large, the short circuit current density is small, and the temperature rise at the short circuit point is low, reducing the battery life. The danger of fire and explosion can effectively improve the short-circuit safety characteristics of lithium-ion batteries.
需要说明的是，根据上述说明书的揭示和阐述，本发明所属领域的技术人员还可以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面揭示和描述的具体实施方式，对本发明的一些等同修改和变更也应当在本发明的权利要求的保护范围内。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。It should be noted that, according to the disclosure and elaboration of the above specification, those skilled in the art to which the present invention pertains can also make changes and modifications to the above implementation manners. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some equivalent modifications and changes to the present invention should also be within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.
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Application publication date: 20101124 |