Mechanically reinforced Ni-rich cathodes for High-Power and Long-Life All-Solid-State batteries

Mechanical integrity is crucial for the intra-particle ionic/electronic transfer in all -solid-state batteries. However, electrode particles suffer severe electrochemo-mechanical degradations during electrode compaction and highvoltage operation, which is extremely true in the popular high-energy cathodes of fragile polycrystalline Nirich oxides composed of loosely stacked nanoparticles. Herein, we develop mechanically reinforced polycrystalline Ni-rich cathodes consisting of densely packed large -size primary particles based on a scalable microstructure engineering strategy. The structural characterization and finite element simulation results demonstrate that this well -designed microstructure of cathodes can suppress the stress/strain accumulation and formation of cracks, and thus maintain the original microstructure and highly percolated ionic/electronic networks. All -solid-state batteries based on mechanically reinforced Ni-rich cathodes achieve significantly improved specific capacity, rate capability, and cyclic stability. This work provides a new sight for designing advanced cathodes to boost the development of high -power and long -life all -solid-state batteries.