New Cost‐Effective Halide Solid Electrolytes for All‐Solid‐State Batteries: Mechanochemically Prepared Fe ³⁺ ‐Substituted Li ₂ ZrCl ₆

[1 ]Department of Chemical and Biomolecular Engineering Yonsei University Seoul 03722 South Korea

[2 ]Department of Energy Engineering Hanyang University Seoul 04763 South Korea

[3 ]Department of Energy and Materials Engineering Dongguk University Seoul 04620 South Korea

[4 ]Department of Energy Science and Engineering DGIST (Daegu Gyeongbuk Institute of Science and Technology) Daegu 42988 South Korea

[5 ]National Synchrotron Light Source II Brookhaven National Laboratory Upton NY 11973 USA