MUMBAI, India, Oct. 12 -- Intellectual Property India has published a patent application (202517131563 A) filed by Contemporary Amperex Technology Co. , Limited on December 24, 2025, for Lithium-Ion Secondary Battery, Battery Apparatus, Electrical Apparatus, Preparation Method For Positive Electrode Active Material, And Preparation Method For Positive Electrode Sheet.
Inventors include Li, Xiaojing; Jia, Xiaoyang; Lin, Yingxi; Liu, Hongyu; Bie, Changfeng; He, Siyuan; Ni, Huan; Liu; Zhang, Xiaofeng; Li, Jia; and Ye, Xinde.
The application for the patent was published on October 09, 2026, under issue no. 41/2026.
Abstract: A lithium-ion secondary battery, a battery apparatus, an electrical apparatus, a preparation method for a positive electrode active material and a preparation method for a positive electrode sheet. The lithium-ion secondary battery comprises a positive electrode sheet, a negative electrode sheet and an electrolyte, the positive electrode sheet comprising a positive electrode current collector and a positive electrode film layer arranged on at least one side of the positive electrode current collector, the positive electrode film layer comprising a positive electrode active material, and the positive electrode active material comprising lithium-containing transition metal phosphate particles of which at least part of the surfaces are provided with a carbon coating material. In a cross-section of the positive electrode film layer in the thickness direction, the area proportion of particles having a particle size greater than or equal to 1.5µm is greater than or equal to 8.0% and less than or equal to 20.0%. The iron dissolution rate of the positive electrode film layer is 658ppm-1921ppm.
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