Furukawa has filed a patent for a sulfide-based inorganic solid electrolyte material with lithium ionic conductivity. The material has a particle shape, and the patent specifies that the value of D90/Dm (particle size corresponding to a cumulative frequency of 90% divided by the mode diameter) should be between 1.6 and 8.0. GlobalData’s report on Furukawa 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 Furukawa, lithium-ion batteries was a key innovation area identified from patents. Furukawa'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.

Sulfide-based inorganic solid electrolyte material with lithium ionic conductivity

Source: United States Patent and Trademark Office(USPTO). Credit: Furukawa Co Ltd

A recently filed patent (Publication Number: US20230170522A1) describes a sulfide-based inorganic solid electrolyte material with lithium ionic conductivity. The material has a particle shape and specific particle size distribution characteristics. The patent claims that the value of the particle size corresponding to a cumulative frequency of 90% (D90) divided by the mode diameter (Dm) should be between 1.6 and 8.0. Additionally, the mode diameter should be 10.0 µm or less.

The sulfide-based inorganic solid electrolyte material consists of lithium (Li), phosphorus (P), and sulfur (S) as constituent elements. The molar ratio of Li to P should be between 1.0 and 5.0, while the molar ratio of S to P should be between 2.0 and 6.0. This material is intended for use in lithium-ion batteries.

The patent also describes a solid electrolyte and a solid electrolyte membrane made from the sulfide-based inorganic solid electrolyte material. The solid electrolyte membrane is obtained by compression-molding the particle-shaped solid electrolyte. The content of a binder resin in the solid electrolyte membrane should be less than 0.5% of the total mass, while the content of the sulfide-based inorganic solid electrolyte material should be 50% or more of the total mass.

Furthermore, the patent claims a lithium-ion battery that includes a positive electrode, an electrolyte layer, and a negative electrode. At least one of these layers should contain the sulfide-based inorganic solid electrolyte material.

The patent also discloses a method of manufacturing the sulfide-based inorganic solid electrolyte material. The method involves preparing a raw material composition containing lithium sulfide, phosphorus sulfide, and optionally lithium nitride. The raw materials are mechanically processed to vitrify them in a chemical reaction, resulting in a sulfide-based inorganic solid electrolyte material in a vitreous state. The obtained material is then classified to adjust the value of D90/Dm to be within the specified range using techniques such as sieving or air flow classification.

In summary, this patent describes a specific sulfide-based inorganic solid electrolyte material with lithium ionic conductivity and its various applications in solid electrolytes, solid electrolyte membranes, and lithium-ion batteries. The patent also provides a method for manufacturing this material with specific particle size distribution characteristics.

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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