Sumitomo Metal Mining has been granted a patent for a non-aqueous electrolyte secondary battery. The battery utilizes a lithium composite oxide with a layered structure, coated with a tungsten-containing compound in the positive electrode active substance. It has a low initial resistance and suppresses an increase in resistance after repeated charging and discharging. The battery includes a positive electrode, a negative electrode, and a non-aqueous electrolyte. The positive electrode active substance layer contains a lithium composite oxide with a porous particle that has a void ratio of 20-50% and contains two or more voids with diameters at least 10% of the particle diameter. The surface of the porous particle is coated with tungsten oxide and lithium tungstate. GlobalData’s report on Sumitomo Metal Mining 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 Sumitomo Metal Mining, extraction by leaching was a key innovation area identified from patents. Sumitomo Metal Mining's grant share as of September 2023 was 30%. Grant share is based on the ratio of number of grants to total number of patents.
Patent granted for non-aqueous electrolyte secondary battery with tungsten coating
A recently granted patent (Publication Number: US11777084B2) describes a non-aqueous electrolyte secondary battery with improved performance. The battery includes a positive electrode, a negative electrode, and a non-aqueous electrolyte.
The positive electrode is equipped with a positive electrode active substance layer, which contains a lithium composite oxide with a layered structure. This lithium composite oxide includes a porous particle with a void ratio ranging from 20% to 50%. The porous particle also contains two or more voids with diameters that are at least 10% of the particle diameter. The surface of the porous particle is coated with a mixture of tungsten oxide and lithium tungstate. It's important to note that the surface of the porous particle includes both the outer surface and the surface of voids within the particle.
In one embodiment, the ratio of tungsten in the coating on the surface of the porous particle to the tungsten in the coating only on the outer surface of the particle is between 1.3 and 1.8. This specific ratio contributes to the improved performance of the battery.
Additionally, the coverage ratio of the coating on the surface of the porous particle is between 10% and 20%. This ensures that the coating is adequately distributed on the surface, further enhancing the battery's performance.
The coating material used in this battery consists solely of tungsten oxide and lithium tungstate. This composition provides the desired properties for the coating and contributes to the overall performance of the battery.
Finally, the coating is comprised of scattered particulates on the surface of the porous particle. This arrangement ensures that the coating is evenly distributed and covers the surface effectively.
Overall, this granted patent presents a non-aqueous electrolyte secondary battery design that incorporates a unique positive electrode active substance layer with a coated porous particle. The specific composition and distribution of the coating contribute to improved battery performance. This innovation has the potential to enhance the efficiency and reliability of non-aqueous electrolyte secondary batteries in various applications.
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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.
