Stora Enso had three patents in batteries during Q3 2023. Stora Enso Oyj has filed a patent for a method of producing a carbon-silicon composite material powder. The method involves using lignin as a carbon-containing precursor and mixing it with silicon-containing active materials. The mixture is then cooled to create an isotropic intermediate composite material, which is subjected to a thermal treatment to produce the carbon-silicon composite material. The resulting powder can be used in the negative electrode of a non-aqueous secondary battery, such as a lithium-ion battery. GlobalData’s report on Stora Enso gives a 360-degreee view of the company including its patenting strategy. Buy the report here.

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Stora Enso grant share with batteries as a theme is 0% in Q3 2023. Grant share is based on the ratio of number of grants to total number of patents.

Recent Patents

Application: A method for producing a carbon-silicon composite material powder, and a carbon-silicon composite material powder (Patent ID: US20230261174A1)

The present disclosure describes a method for producing a carbon-silicon composite material powder. The method involves providing a carbon-containing precursor, such as lignin, and at least one silicon-containing active material. These components are melt-mixed together at a temperature between 120-250°C to form a melt-mixture. The melt-mixture is then cooled to provide an isotropic intermediate composite material. This intermediate material is subjected to a thermal treatment, including a carbonization step, to produce a carbon-silicon composite material. The carbon-silicon composite material is then pulverized to obtain the desired carbon-silicon composite material powder.

The carbon-containing precursor used in the method can be Kraft lignin, and it can be provided in particulate form. The silicon-containing active material can be elemental silicon, a silicon suboxide, a silicon-metal alloy, or a silicon-metal carbon alloy, and it can also be provided in particulate form. The carbon-containing precursor is mixed with 0.5-30 wt-% of the silicon-containing active material during the melt-mixing step.

The method may also involve the addition of dispersing additives, such as monoethers, polyethers, mono-alcohols, polyalcohols, amines, carbonates, polycarbonates, monoesters, polyesters, and polyether fatty acid esters. These additives can be included in the melt-mixing step along with the other components. The carbon-containing precursor can be mixed with 0.5-30 wt-% of the silicon-containing active material and 0.5-10 wt-% of the dispersing additive during the melt-mixing step.

Additional steps in the method may include providing graphite particles or carbon particles, or both, in the melt-mixing step, and pre-mixing the components before the melt-mixing step using methods such as dry mixing, dry milling, wet milling, melt-mixing, solution mixing, spray-coating, spray-drying, dispersion mixing, or combinations thereof.

The carbonization step in the thermal treatment is performed at a temperature of 700-1300°C, and there may be one or more initial heating steps before the carbonization step, each performed at a temperature of 250-700°C. A pulverization step may also be included after the initial heating steps and before the carbonization step.

The resulting carbon-silicon composite material powder has powder particles with an average particle size between 5-25 µm. Additionally, the method may include a step of carbon-coating the carbon-silicon composite material powder particles.

The carbon-silicon composite material powder obtained through this method can be used as a negative electrode in a non-aqueous secondary battery, such as a lithium-ion battery.

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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.