Northvolt has been granted a patent for a process that generates metal sulfate through crystallization from an aqueous solution. The method includes separating crystallized metal sulfate from mother liquor, converting uncrystallized sulfate into a basic metal salt, and potentially producing battery-grade or electroplating-grade metal sulfate. GlobalData’s report on Northvolt 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 Northvolt, Hydrogen storage alloys was a key innovation area identified from patents. Northvolt's grant share as of July 2024 was 15%. Grant share is based on the ratio of number of grants to total number of patents.
Process for generating battery-grade metal sulfate
The patent US12054401B2 outlines a comprehensive process for generating metal sulfates, particularly from recycled lithium-ion batteries and manufacturing scrap. The process begins with leaching a feedstock to create an aqueous solution containing metal sulfates, which is then crystallized to form a solid product while leaving uncrystallized metal sulfates in the mother liquor. The method emphasizes the separation of crystallized metal sulfates and includes steps for refining the aqueous solution to remove impurities. Notably, the process allows for the selective inhibition of lithium and other impurities during crystallization by controlling the bleed rate of the mother liquor and adjusting the crystallization conditions.
Further claims detail the use of various feedstocks, including mixed hydroxide and sulfide precipitates, and the incorporation of neutralizing agents to convert uncrystallized metal sulfates into basic metal salts. The process also includes the potential for recycling by-products, such as sodium sulfate, back into the system. The crystallized metal sulfates produced can be of battery-grade or electroplating-grade quality, with specific emphasis on nickel, cobalt, and manganese sulfates. The patent highlights the importance of maintaining optimal pH levels and managing water evaporation during crystallization to enhance the purity of the final product while minimizing waste. Overall, this innovative approach aims to improve the efficiency and sustainability of metal sulfate production from recycled materials.
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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.
