MUMBAI, India, March 14 -- Intellectual Property India has published a patent application (202517128943 A) filed by Svolt Energy Technology Co. Ltd., Jiangsu, China, on Dec. 19, 2025, for 'negative electrode metal foil and preparation method therefor, and battery.'
Inventor(s) include Shao, Meng; Su, Shufa; Wu, Jiangxue; Geng, Shouxian; and Zhao, Jianye.
The application for the patent was published on March 13, under issue no. 11/2026.
According to the abstract released by the Intellectual Property India: "The present disclosure relates to a negative electrode metal foil and a preparation method therefor, and a battery. The preparation method for a negative electrode metal foil comprises the following steps: using a metal foil substrate as a working electrode, using graphite or a platinum sheet as a counter electrode, placing the metal foil substrate and the graphite or the platinum sheet in an electrolyte, and carrying out anodic oxidation at a constant voltage to obtain a composite metal foil having an oxide layer on the surface; and carrying out ultrasonic treatment on the composite metal foil, and removing the oxide layer to obtain a negative electrode metal foil, wherein the surface of at least one side of the negative electrode metal foil is provided with a plurality of recessed structures, and the plurality of recessed structures are distributed in an array. By means of the anodic oxidation and ultrasonic treatment, an array of nano recessed structures having an electric field uniformization function is prepared on the surface of the metal foil substrate, so that an electric field for lithium deposition is uniformized to improve the cycling stability of a negative electrode-free lithium-ion battery having a high energy density, thereby obtaining a negative electrode-free lithium-ion battery having both high specific energy and long circulation."
The patent application was internationally filed on May 15, 2024, under International application No.PCT/CN2024/093500.
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