Separator for electrochemical elements, and electrochemical element using same

一种电化学元件、隔离物的技术，应用在电气元件、电解电容器、电池组零部件等方向，能够解决阻碍密封等问题，达到故障少、内部短路故障率小、表面平滑性高的效果

Active Publication Date: 2019-01-04
MITSUBISHI PAPER MILLS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the assembly process of the electrochemical element, an electrode group composed of a positive electrode, a separator, and a negative electrode is placed in the casing of the electrochemical element, and the electrolyte is injected from the liquid injection port, and the liquid injection port is sealed. However, the seal is sometimes hindered by fluff attached to the filling port

Method used

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  • Separator for electrochemical elements, and electrochemical element using same
  • Separator for electrochemical elements, and electrochemical element using same
  • Separator for electrochemical elements, and electrochemical element using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Mix 15 parts of rayon fibers with a fineness of 0.8 dtex and a fiber length of 3 mm and 85 parts of solvent-spun cellulose fibers with a beating degree of 90 ml by a modified method, and dissociate them in the water of a pulper, and use a stirrer to After stirring, a uniform raw material slurry (0.3% concentration) was prepared. The beaten solvent-spun cellulose fibers were obtained by finely refining solvent-spun cellulose fibers having a fiber diameter R of 10 μm and a fiber length of 4 mm. A wet-laid fiber web was obtained from the raw material slurry using an inclined short-wire paper machine. The wet fiber web was dried using a Yankee dryer (temperature 120° C.) and a hot air hood dryer (temperature 120° C.) installed on the upper surface of the Yankee dryer to obtain a dried fiber web. Thereafter, the dried web was subjected to a calender treatment using metal rolls and elastic rolls to obtain a basis weight of 17.3 g / m 2 , A spacer with a thickness of 30.4 μm. ...

Embodiment 2

[0084] The rayon fibers in Example 1 were set to 25 parts, and the solvent-spun cellulose fibers formed by beating were set to 75 parts, except that, the same method was used to obtain a weight per unit area of ​​17.4 g / m 2 , A spacer with a thickness of 30.2 μm.

Embodiment 3

[0086] The rayon fiber in Example 1 was set as 10 parts, and the solvent spinning cellulose fiber formed by beating was set as 90 parts, except that, the same method was used to obtain a weight per unit area of ​​17.2 g / m 2 , A spacer with a thickness of 30.1 μm.

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Abstract

To provide a separator for electrochemical elements that has a low internal short-circuit failure rate and high surface strength, and an electrochemical element that uses said separator. Provided is aseparator for electrochemical elements that includes solvent-spun cellulose fibers obtained by beating, and rayon fibers having a fiber diameter of 9.5 [mu]m or smaller. More preferably, provided isa separator for electrochemical elements in which the content of the rayon fibers is 10-25 mass% relative to all the fibers. This separator can be used in electrochemical elements such as electric double-layer capacitors, hybrid capacitors, redox capacitors, and lithium secondary batteries.

Description

technical field [0001] The present invention relates to a separator for electrochemical elements and an electrochemical element using the same. Background technique [0002] Lithium secondary batteries, a type of electrochemical element, have an average operating voltage of 3.7V, about three times that of alkaline secondary batteries, and are therefore used in various applications as electrochemical elements with high energy density middle. Examples of applications include mobile phones, notebook computers, hybrid vehicles, electric vehicles, power storage applications, and the like. [0003] Capacitors, which are one type of electrochemical elements, are widely used in applications such as power supplies used in vehicles and electrical equipment because they have large capacitance and high stability against repeated charge and discharge. [0004] The main components used in an electrochemical element are a positive electrode, a negative electrode, a separator for an elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/52H01M2/16H01M50/409H01M50/494
CPCH01G11/52H01B3/48H01B3/485H01B3/52Y02E60/13Y02E60/10H01M50/4295H01M50/44H01M50/409H01M50/494H01G9/02
Inventor 重松俊広鬼头昌利大山圭介
Owner MITSUBISHI PAPER MILLS LTD
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