Surface-modified and sulfide electrolyte-infiltrated LiNi_0.6Co_0.2Mn_0.2O₂ cathode for all-solid-state lithium...

Sulfide-based all-solid-state lithium batteries (ASSLBs) with high-voltage Ni-rich layered cathodes have shown great potential in energy storage systems. However, the application of ASSLBs is hindered by severe interface issues and poor solid-solid contact between cathodes and sulfide electrolytes. In this work, a suitably thin Li_1.5Al_0.5Ge_1.5(PO₄)₃ (LAGP) coating (0.41 mS cm^-1) is introduced onto the surface of single-crystal LiNi_0.6Co_0.2Mn_0.2O₂ particles to mitigate interface side reactions. Subsequently, sheet-type electrodes are fabricated by the infiltration of Li₁₀GeP₂S₁₂ to fill the voids and achieve highly dense solid-solid contact, thus preventing contact loss. The Li₁₀GeP₂S₁₂-infiltrated ASSLBs with a LAGP buffer layer display a high initial discharge capacity of 141.5 mAh g^-1 at 0.05 C and ultrastable cycling for 100 cycles at 0.1 C. An effective fabrication method for highly dense electrodes is proposed in this work, which provides a new direction for scalable industrial production.