Summary:

The invention provides a method and product for lithium supplementation at the cathode of lithium-ion batteries based on freeze-drying, the slurry dissolved with the cathode lithium supplement is coated on the current collector to obtain a wet electrode piece, the wet electrode piece is frozen and dried at low temperature and low pressure to obtain the cathode material after lithium supplementation, and the lithium supplement dissolved in the slurry is precipitated into fine grains through cooling crystallization and evenly mixed with the cathode active material and distributed in the final cathode material in the freezing process, so as to reduce the decomposition voltage of the lithium supplement and improve the electrochemical performance of the cathode material assembled into a battery after lithium supplementation, It solves the technical problems of high decomposition potential, residual inactive substances and instability to air and water of the cathode lithium supplement.

Link: http://epub.cnipa.gov.cn/patent/CN114335532A?8kt2YOWWXQBD=1694672585727