Transforming silicon slag into high capacity anode material for lithium-ion batteries

• Main Authors: HEITZ, ALEXANDRE, SHAHVERDI, ALI, MARDAN, MILAD, VANPEENE, VICTOR, ROUE, LIONEL, CARABIN, PIERRE
• Format: Patent
• Language: Chinese; English
• Published: 01.10.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

A method for transforming silicon slag into an anode material in lithium-ion batteries, comprising applying mechanical grinding, such as high-energy ball milling, to reduce particle size of silicon slag to micron and submicron sizes and/or to increase the amorphicity of the silicon slag powder. The silicon slag being used as raw material in fabricating the anodes has a composition of Si-SiC-C-SiO2, preferably having Si phase in both crystalline and amorphous states, and more preferably having Si phase only in amorphous state after a high-energy ball-milling thereof. The silicon slag has preferably a median particle diameter ≤ 20 [mu]m after a high-energy ball-milling thereof and ≤ 20 [mu]m after a slurry homogenization thereof. The silicon slag preferably contains 64 %wt. Si + 31 %wt. SiC + 4 %wt. C + 1 %wt. SiO2.