Homeostatic Solid Solution Reaction in Phosphate Cathode: Breaking High‐Voltage Barrier to Achieve High Energy Density and Long Life of Sodium‐Ion Batteries

, driving the leading development of MLNP among other NASICON structure SIBs. The integration of multiple redox couples with low strain modulates the reaction pathway effectively and will open a new avenue for fabricating high-performance cathodes in SIBs.