Quantum mechanics

Catalysis

Adsorption

Composite number

Engineering

Lithium (medication)

Electrochemistry

Materials science

Cathode

Mineralogy

Endocrinology

Iron sulfide

Inorganic chemistry

Chemical engineering

Physical chemistry

Redox

Physics

Organic chemistry

Pyrite

Composite material

Sulfur

Kinetics

Medicine

Chemistry

Electrode

Sulfide

Nickel

Cobalt sulfide

Nickel sulfide

Journal of Alloys and Compounds

Lithium polysulfides shuttle effect and their sluggish redox kinetics have seriously affected the development of lithium-sulfur batteries. To solve these issues, we have designed cubic pyrite-structure NiS2 nanospheres modification of Ketjen [email protected] (NiS2/[email protected]) composite as cathode materials for lithium-sulfur batteries. The NiS2 nanospheres have a positive effect on the adsorption and catalysis performance of the lithium polysulfides, which further facilitates the redox kinetics. Consequently, the NiS2/[email protected] cathode with 3.1 mg cm−2 sulfur loading attains a discharge capacity of 869 mAh g−1 at 0.5 C and reversible capacity is 461 mAh g−1 after 500 cycles. Even at high sulfur loading of 5.3 mg cm−2, the NiS2/[email protected] electrode still delivers a high initial area capacity of 4.82 mAh cm−2 at 0.2 C with capacity retention capacity of 3.74 mAh cm−2 after 120 cycles. The cyclic and rate properties of NiS2/[email protected] are greatly improved over that of [email protected] The results suggest that multifunction cubic pyrite-structure NiS2 nanospheres that anchors effectively and catalysis is beneficial to the large-scale application for lithium-sulfur batteries.

Cubic pyrite nickel sulfide nanospheres decorated with Ketjen black@sulfur composite for promoting polysulfides redox kinetics in lithium-sulfur batteries