Battery (electricity)

Quantum mechanics

Calcination

Catalysis

Composite number

Engineering

Lithium (medication)

Lithium-ion battery

Metallurgy

Materials science

Endocrinology

Power (physics)

Carbon fibers

Inorganic chemistry

Chemical engineering

Porosity

Physics

Nanotechnology

Organic chemistry

Composite material

Sulfur

Nanocrystal

Medicine

Chemistry

Journal of Power Sources

FeS2 nanocrystals are successfully prepared in the carbon capsules of pre-prepared hierarchical porous carbon (HPC). The absorbed Fe ions in HPC are first calcined into Fe3O4 and then react with sulfur under vacuum conditions to synthesize FeS2. HPC, with micro-porous shells and inter-connected macro-porous carbon capsules, shows highly ionic/electrical conductivities and efficient buffer effect on the volume change of FeS2. FeS2@HPC exhibits a high specific capacity of 907 mAh·g−1 in the first cycle and remains 720 mAh·g−1 after 100 cycles at the rate of 1 C.

FeS2 nanocrystals prepared in hierarchical porous carbon for lithium-ion battery