Table 1 Minimal 1,2 and 3-dimensional path migration energies of known and potential K⁺ ion conductors, based on nudged elastic band density functional theory calculations³⁹

1D

2D

3D

KFeO₂

0.106

0.155

0.227

KAlO₂

0.094

0.135

0.257

K₂Cu₃Ge₅O₁₄

0.261

0.883

K₂SbPO₆

0.292

0.359

0.668

K₅As₃O₁₀

0.279

0.300

0.425

K₄V₂O₇

0.218

0.341

0.388

K₂Zn₃O₄

0.064

 -

 -

K₂Sb₄O₁₁

0.096

 -

 -

K₃NbAs₂O₉

0.130

 -

0.611

K₃NbP₂O₉

0.195

 -

0.774

K₂Al₂Sb₂O₇

 -

0.141

 -

K₆CuSi₂O₈

0.240

0.463

0.512