Irradiation cross-linking lithium-ion battery diaphragm and preparation method thereof

A technology of irradiation and diaphragm, applied in the direction of battery pack components, circuits, electrical components, etc., can solve the problems of insufficient current, low closed cell temperature, high hole temperature, etc., to improve power battery power and high temperature thermal shrinkage rate The effect of reducing and increasing the electrolyte absorption rate
CN103421208BActive Publication Date: 2015-04-29ZHEJIANG UNIV +2
5 Cites 5 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2015-04-29

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a method for preparing a radiation cross-linked polyethylene porous separator. In this method, the polyethylene porous separator is soaked to absorb a volatile solvent containing an initiator and a cross-linking agent, and the initiator and cross-linking agent are introduced on the surface and inside the porous separator. Linking agent is used, and then the film is irradiated and cross-linked under the water surface or under the protection of inert gas. By controlling the irradiation conditions, a partially cross-linked separator is obtained. The advantages of this irradiation cross-linked polyethylene porous separator are: the tensile strength and hydrophilicity are greatly improved; the high-temperature thermal shrinkage is greatly reduced; it makes up for the low rupture temperature of the separator and ensures the normal closure of the separator. At the same time, the membrane rupture temperature of the film is greatly increased. The closing temperature of the separator of the present invention is between 120 and 140°C, and the membrane rupture temperature is increased to above 160°C.
Need to check novelty before this filing date? Find Prior Art

Description

Technical field

[0001] The present invention relates to the field of lithium ion batteries, and in particular to a radiation cross-linked lithium ion battery separator and a preparation method thereof. Background technique

[0002] Lithium-ion battery is a new type of rechargeable battery developed on the basis of lithium storage battery. It was successfully developed and commercialized by SONY in 1990. Because of its advantages such as high specific energy, long cycle life, and no memory effect, it has become a research hotspot in new power technology in recent years. It can be widely used in portable electronic products such as mobile phones, laptops, digital cameras, camcorders, and even in fields such as electric bicycles, electric vehicles, and energy storage batteries that are currently strongly advocated in the world.

[0003] The main components of a lithium-ion battery include electrodes, isolation membranes and electrolytes. The isolation membrane plays a key role...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More