Highly reversible potassium-ion intercalation in tungsten disulfide.

ABSTRACT: Rechargeable potassium-ion batteries (PIBs) show promise beyond Li-ion technology in large-scale electrical-energy storage due to the abundance and low cost of potassium resources. However, the intercalation of large-size K⁺ generally results in irreversible structural degradation and short lifespan to the hosts, representing a major obstacle. Here, we report a new electrochemical K⁺-intercalation host, tungsten disulfide (WS₂), which can store 0.62 K⁺ per formula unit with a reversible capacity of 67 mA h g^-1 and well-defined voltage plateaus at an intrinsically safe average operation potential of 0.72 V versus K/K⁺. In situ X-ray diffraction and ex situ electron microscopy revealed the underlying inter

SUBMITTER: Zhang R 

PROVIDER: S-EPMC6419940 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature