Issue 8, 2021 - Research on high energy density lithium batteries has progressed

Recently, the research team of Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, aimed at the volume expansion of silicon-carbon anode materials, started from the source to construct a highly mechanically stable self-mechanical inhibition of graphene composite silicon-carbon anode materials, and built a pilot production line
for 100-ton graphene composite silicon-carbon anode materials.

The researchers mixed silicon oxide (SiOx) and graphene slurry evenly in the liquid phase system, used bitumen as an additive, and prepared spherical graphene/bitumen pyrolysis carbon encapsulated silicon oxide composite anode material (SGC)
through spray drying, high-temperature heat treatment and chemical vapor deposition.

Studies have shown that after graphene modification, the conductivity of the powder can be increased by more than 2 orders of magnitude, when the graphene content exceeds 7%, the lubrication effect of graphene is conducive to improving the density of powder compaction, and the SGC composite anode material can inhibit the amount of SiOx lithium uptake, reduce volume expansion and improve cycle stability
.