CN1213500C - 制造薄的锂电池的方法 - Google Patents
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Abstract
公开了一种制造锂电池的方法。所述锂电池至少包括一个负电极的叠层、一个分隔器、和一个正电极。在所述方法中,在负电极以及在所述正电极上产生一个多孔的图形。将一种聚合材料施加在叠层的至少一侧并且使叠层受到加热和压力,使得聚合材料穿进孔,据此各部件被粘贴和压制在一起。在上述方法中,所述聚合材料包括至少部分地位于电极中的孔的端部的凸出部分。提供这种聚合材料的凸出部分,使足够的聚合材料来填充孔并且将电极和分隔器粘贴在一起,而在叠层的外侧,在孔之间,聚合材料可以很薄或者甚至不需要。
Description
技术领域
本发明涉及一种制造锂电池的方法,该电池包括一个负电极的叠层、一个分隔器、和一个正电极,该方法包括的步骤为:将负电极材料施加在一个负电流收集器上以构成所述负电极,将正电极材料施加在一个正电流收集器上以构成所述正电极,并且将一个分隔器设置在所述负电极和所述正电极之间,所述方法包括以下步骤:
a)在所述负电极上产生一个多孔的图形;
b)在所述正电极上产生一个多孔的图形;
c)将一种聚合材料施加在所述叠层的至少一侧并且使所述叠层和所述聚合材料受到加热和压力,使得所述聚合材料穿进所述孔,据此所述负电极、所述正电极和所述分隔器被粘贴和压制在一起。
背景技术
对于例如CD播放机、移动电话机、膝上计算机和视频摄像机这类重量轻、便携式的无绳消费者产品的日益增长的市场来说,具有日益增加的对高密度电池的需求。特别地,需要很薄的和灵活的电池。如果要达到一种可接收的便携性,包含在所述消费者产品中的的电池应以尽可能小的重量和体积来提供能量的需要量。锂是用在其中需要在最小重量下的高能量的电池中的一种非常良好的材料。然而,电池越薄,应用保持电池的各部件之间的足够接触所需的压力就越困难。
根据前序部分的一种制造锂电池的方法可从其公开号为WO00/04601的国际专利申请获知。
由所述方法获得的电池具有薄的和灵活的形状,并且同时提供非常高的能量密度。而且,以一种非常有效的方式获得和保持电极和分隔器之间的接触。该电池被包装在一种薄壁的容器中,因为不需要这种容器的壁对电池的各部件保持足够的压力。在根据国际申请WO00/04601的其中一种方法中,一个聚合材料的膜被施加到该叠层的两侧,并且该聚合膜受到加热和压力。其结果,聚合膜熔化并且穿进孔。由所述方法得到的电池带有在叠层两侧的一个聚合膜以及在各孔之中的聚合材料,该孔用作插头或铆钉并且粘贴各层,使得这些层黏合在一起。
发明内容
本发明的一个目的是提供一种制造根据前序部分的锂电池的方法,以本方法可得到甚至更薄的电池。
为此目的,根据前序部分的制造锂电池的方法的特征在于,聚合材料包括至少部分地位于所述电极中的孔的端部的凸出部分。
由于在电极中的孔的端部提供这种聚合材料的凸出部分,就提供了足够的聚合材料来填充孔并且将电极和分隔器粘贴在一起,而在叠层的外侧,在孔之间,聚合材料可以很薄或者甚至不需要。这样得到的电池可提供与根据现有技术的方法得到的电池相同量的能量,但体积较小。于是,根据本发明的方法得到的电池具有较高的容量。
在一个特定的实施例中,聚合材料包括一个带有凸出部分的聚合箔。
如上所述,聚合箔本身可以很薄,而凸出部分必须包括足够的聚合材料以填充电极中的孔,由此将电极和分隔器黏合在一起。
在一个优选实施例中,聚合材料设置在一个载体箔之上。
将聚合材料设置在一个载体箔上会便于其处理。将电池叠置之后,既可以将载体箔移去,也可以留在原处。
有利的是,载体箔包括一种具有高熔点的聚合材料。
如果提供这种载体箔,载体箔本身在应用加热期间并不熔化,而聚合材料将熔化,由此穿进电极的孔。
在另一个优选实施例中,聚合材料被置于载体箔上的凸出部分的一个成为图形的设置之中。
在应用加热期间,凸出部分将熔化并且穿进电极中的孔。之后,可将载体箔移去。在这样得到的电池中,已穿进电极中的孔的聚合材料基本上不存在于电极的外侧。
在另一个良好的实施例中,聚合材料被置于载体的多个部分之间的凸出部分的一个成为图形的设置之中。
也在本例中,在熔化聚合材料和其穿进孔之后,载体箔可以从电极中的孔的开口之间移去。据此得到一种电池,其中已穿进电极中的孔的聚合材料基本上不存在于电极的外侧。
在上述方法中,最好采用一种渗透的(porous)聚合材料来制成用于必须要进入电极中的孔的聚合材料,例如,渗透的聚乙烯。聚合材料最好是弹性的。可采用的载体箔最好包括一个强的箔,例如MylarTM或KaptonTM。
电极材料可以由在干处理中全部处于粉状的混合的负或正的活跃(active)材料、导电材料和黏合剂材料制成,或者在湿处理中再添加水或有机溶剂。
再将所得到的糊状混合物提供在电流收集器上,干燥,并加压。为此目的,通常可采用以下的涂覆方法之一:丝网印刷、滚筒涂覆、医生刀片(doctorblade)涂覆、刀具涂覆、喷挤涂覆、条涂覆、浸涂覆和挤压涂覆。干燥后经压制的涂覆层的厚度一般在1至1000μm的范围。
在上述方法中,叠层的压制是通过在大约110至150℃在加热的金属板之间简单地施加5.104帕(注:应为5×104帕)的压力。此操作可以利用砑光机滚筒来进行。加热之后,叠层被冷却至室温。加热和冷却可以在一个具有特定形状的模具中进行,例如,电池可恰好置入其中的器具的形状。
以与上述同样的方式,可以在一个步骤中将多层的叠层黏合在一起,据此得到增加了容量和电压的电池。
本发明的锂电池可用在各种(无绳)装置中,例如笔记簿个人计算机、便携式CD播放机、便携式电话机、传呼设备、视频摄像机、电须刀、电工具、电车辆、和助听装置。锂电池可用作主电池或副电池。
附图说明
借助实施例并且参照附图对本发明更详细地进行解释,附图中:
图1示意地示出一个负电极叠层、一个分隔器和一个正电极,以及带有在叠层的两侧的凸出部分的聚合箔;
图2示意地示出根据图1的一个叠层,其中聚合箔被设置在一个载体材料上;
图3示意地示出一个负电极叠层、一个分隔器和一个正电极,以及在叠层的两侧的载体箔上的聚合材料的凸出部分;和
图4示意地示出一个负电极叠层、一个分隔器和一个正电极,以及在叠层的两侧的载体箔的部分之间的聚合材料的凸出部分。
实施例说明
用于负电极材料的混合物是这样制备的,将用作活跃正材料的具有颗粒尺寸为10μm的6g石墨颗粒、用作黏合剂的4.5g羧基甲基纤维素(1%水溶液)和0.5g苯乙烯丁二烯橡胶(60%分散于水中)相混合,并且形成一种糊状以作为一种涂覆物质施加在一个铜箔电流收集器的两个表面。涂覆的厚度是200μm。铜箔的厚度达14μm。被涂覆的电流收集器在85℃预干燥达15分钟,在110℃热处理达3小时,然后加压直到厚度变为110μm。切割负电极,使其为2×2cm2的正方形。
用于正电极材料的混合物是这样制备的,将用作活跃正材料的6g LiCoO2石墨颗粒、用作导电材料的0.18g乙炔黑颜料、用作黏合剂的5g羧基甲基纤维素(1%水溶液)和0.7g聚四氟乙烯(60%分散于水中)相混合,并且形成一种糊状以作为一种涂覆物质施加在一个铝箔电流收集器的两个表面。涂覆的厚度是420μm。铝箔的厚度达20μm。被涂覆的电流收集器在85℃预干燥达15分钟,在250℃热处理达4小时,然后加压直到厚度变为100μm。切割正电极,使其为2×2cm2的正方形。
一个25μm厚的渗透聚乙烯箔被用作一个分隔器。
负电极和正电极各带有由机械打孔的孔图形。正电极中的孔的直径最好是大约1mm,而负电极中的孔的直径最好是大约0.8mm。所述直径的差别并未在附图示出。以一个二维阵列来提供这些孔,其相互孔距为5mm。
一个叠层由负电极3、分隔器4和正电极5制成。如附图所示,负电极3带有孔7,正电极5带有孔8。聚合箔9设置在叠层1的两侧,该聚合箔带有位于电极中的孔的端部的凸出部分10。当叠层受到加热和压力时,聚合材料将熔化,导致至少聚合材料的凸出部分穿进孔,据此将电极和分隔器黏合在一起。保留在电极3,5的外侧的聚合箔9的层的厚度与现有技术中的聚合箔的厚度相比显著地减小。
图2中,一个叠层1带有所谓凸出的箔9,它设置在一个载体材料11上。设置这种载体箔11可便于聚合箔的处理。而且,所述载体箔在电池的叠置之后或者在热处理的应用之后可被移去。在后一种情况下,载体箔包括一种具有高熔点的材料是很重要的,该熔点高于聚合箔9的聚合材料的熔点。载体箔最好包括具有高熔点的强的聚合材料,例如MylarTM或KaptonTM。
图3示出一种情况,其中一个载体箔11本身带有聚合材料的凸出部分10。凸出部分10最好位于电极3,5中的孔的端部。同样在这种情况下,在电池的叠置之后或者在热处理的应用之后可被移去。当叠层已受到热和压力的处理时,基本上所有的聚合凸出部分10将已进入电极3,5中的孔中,在电极的外侧基本上没有剩下同样的聚合材料。
最后,图4示出一种在叠层的两侧带有置于其间的聚合材料的凸出部分10的载体箔。类似于后一种情况,在热处理之后,基本上所有的聚合凸出部分10将已进入电极3,5中的孔中,在电极的外侧基本上没有剩下同样的聚合材料。
虽然并未在附图中示出,但分隔器4也带有孔的图形。所述图形可对应于在负电极和正电极两者中的孔的图形,使得熔化的聚合材料顺序穿过电极个分隔器中的孔。
这样,本发明提供了一种制造锂电池的方法,据此可以得到具有比现有技术的电池更高容量的非常薄的电池。
Claims (6)
1.一种制造锂电池的方法,该电池包括一个负电极的叠层、一个分隔器、和一个正电极,该方法包括的步骤为:将负电极材料施加在一个负电流收集器上以构成所述负电极,将正电极材料施加在一个正电流收集器上以构成所述正电极,并且将一个分隔器设置在所述负电极和所述正电极之间,所述方法包括以下步骤:
a)在所述负电极上产生一个多孔的图形;
b)在所述正电极上产生一个多孔的图形;
c)将一种聚合材料施加在所述叠层的至少一侧并且使所述叠层和所述聚合材料受到加热和压力,使得所述聚合材料穿进所述孔,据此所述负电极、所述正电极和所述分隔器被粘贴和压制在一起,其特征在于,所述聚合材料包括至少部分地位于所述电极中的孔的端部的凸出部分。
2.根据权利要求1所述的制造锂电池的方法,其特征在于,所述聚合材料包括带有凸出部分的一个聚合箔。
3.根据权利要求1或2所述的制造锂电池的方法,其特征在于,所述聚合材料被设置在一个载体箔上。
4.根据权利要求3所述的制造锂电池的方法,其特征在于,所述载体箔的熔点高于聚合材料的熔点。
5.根据权利要求3所述的制造锂电池的方法,其特征在于,所述聚合材料被置于所述载体箔上的凸出部分的一个成为图形的设置之中。
6.根据权利要求1所述的制造锂电池的方法,其特征在于,所述聚合材料被置于所述载体箔的多个部分之间的凸出部分的一个成为图形的设置之中。
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EP (1) | EP1175708B1 (zh) |
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CN106229540A (zh) * | 2016-05-26 | 2016-12-14 | 江苏深苏电子科技有限公司 | 一种柔性锂离子电池及其制造方法 |
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WO2002103835A1 (en) * | 2001-06-20 | 2002-12-27 | Koninklijke Philips Electronics N.V. | Method of manufacturing a lithium battery as well as a lithium battery |
CN100433418C (zh) * | 2005-07-30 | 2008-11-12 | 深圳市艾博尔新能源有限公司 | 一种提高锂电池金属锂利用率的方法 |
US20080289171A1 (en) * | 2007-05-22 | 2008-11-27 | Jason Cheng | Method for assembling a stacked plate electrochemical device |
CN102294878B (zh) * | 2011-07-29 | 2014-03-26 | 邱会生 | 一种锂电池电极材料制备装置 |
CN114597486A (zh) | 2020-12-07 | 2022-06-07 | 通用汽车环球科技运作有限责任公司 | 具有均匀分布的电解质的固态电池组及与之相关的制造方法 |
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JPS59148280A (ja) * | 1983-02-14 | 1984-08-24 | Tomoyuki Aoki | 電池 |
US5547780A (en) * | 1993-01-18 | 1996-08-20 | Yuasa Corporation | Battery precursor and a battery |
EP0893838A1 (fr) * | 1997-07-22 | 1999-01-27 | Koninklijke Philips Electronics N.V. | Cellule électrochimique élémentaire planaire, élément précurseur pour une telle cellule, et élément accumulateur plat incluant une telle cellule |
ATE213098T1 (de) * | 1998-07-16 | 2002-02-15 | Koninkl Philips Electronics Nv | Lithium-sekundärbatterie |
WO2000060690A1 (en) * | 1999-03-31 | 2000-10-12 | Koninklijke Philips Electronics N.V. | Method of bonding a separator and an electrode, more particularly a cathode or an anode, as well as a battery |
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DE60102984T2 (de) | 2005-07-07 |
EP1175708A1 (en) | 2002-01-30 |
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CN1363120A (zh) | 2002-08-07 |
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