  A group of newly discovered non-magnetic metal kagome structures AV3Sb5 (A=K,
Rb, Cs) have aroused widespread interest in experiment and theory due to their
unusual charge density wave (CDW) and intertwined superconductivity. However,
they all possess weak electron-phonon coupling (EPC) and low superconducting
transition temperature. Here, we performed high-throughput first-principles
calculations on novel kagome candidates with AV3Sb5 prototype structure, and
proposed 24 dynamically stable novel kagome metals. The calculation based on
Bardeen-Cooper-Schrieffer theory shows that most of these metals are
superconductors with much stronger EPC than the reported AV3Sb5 materials, and
their superconducting transition temperatures Tc is between 0.3 and 5.0K.
Additionally, several compounds, such as KZr3Pb5 with the highest Tc, are
identified as Z2 topological metals with clear Dirac cone topological surface
states near Fermi level. NaZr3As5 is shown to have possible CDW phases. Our
results provide rich platforms for exploring various new physics with the
prototype kagome structure, in which the coexistence of superconductivity and
nontrivial topological nature provides promising insights on the discovery of
topological superconductors.
