Mitsubishi Paper Mills has filed a patent for a non-woven fabric that supports a solid electrolyte. The fabric contains heat-fusible composite fibers with a crimp, making it suitable for achieving a thin solid electrolyte sheet with few defects. The solid electrolyte sheet is self-sustainable and flexible. GlobalData’s report on Mitsubishi Paper Mills gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Mitsubishi Paper Mills, corrosion resistant battery packaging was a key innovation area identified from patents. Mitsubishi Paper Mills's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.

A recently filed patent (Publication Number: US20230193534A1) describes a non-woven fabric designed to support a solid electrolyte. The fabric, referred to as non-woven fabric A, is composed of heat-fusible composite fibers with a crimp, making up at least 60% and up to 100% of the fabric's mass. These fibers are heat-fused together to create a stable structure.

In addition to the composition of the fabric, the patent also specifies certain characteristics. The number of crimps in each heat-fusible composite fiber should range from 6 to 25 per inch. The fibers themselves are of the core-sheath type, with a core made of a polypropylene-based polymer and a sheath made of a polyolefin-based polymer with a lower melting point than the core. The fineness of the fibers is between 0.1 and 0.4 dtex.

The non-woven fabric A is required to have an air permeability ranging from 150 to 2500 cm3/cm2·sec. This ensures that the fabric allows for the passage of air or gas, which is important for the functioning of the solid electrolyte.

The patent also mentions the possibility of laminating a second non-woven fabric, referred to as non-woven fabric B, on at least one surface of non-woven fabric A. Non-woven fabric B is made of nanofibers with an average diameter of no more than 2 µm. It can be formed using either a melt-blown method or an electrospinning method.

Finally, the patent describes a solid electrolyte sheet that incorporates the non-woven fabric A as a support structure for the solid electrolyte. This sheet combines the unique properties of the non-woven fabric with the functionality of the solid electrolyte.

Overall, this patent presents a novel non-woven fabric designed specifically for supporting a solid electrolyte. The fabric's composition, structure, and characteristics make it suitable for use in various applications involving solid electrolytes. The inclusion of a second non-woven fabric layer further enhances its capabilities. This innovation has the potential to advance the field of solid electrolyte technology and find applications in industries such as energy storage and electronics.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.