Journal Article lithium-ion batteries 2D materials CsPbX3 Research Support, Non-U.S. Gov't Review all-inorganic materials all-inorganic solar cells cathode materials cathodes defect engineering electrochemistry heterostructure high stability indium intergranular cracking ionic conductivity lattice oxygen release lead-free materials low‐concentration electrolyte perovskite derivatives perovskite solar cells protective layers rechargeable batteries second-harmonic generation solid‐electrolyte interphase solvation structure valleytronics