掺铬富锂锰基材料作为高性能全固态锂电池正极OA

With prospects for high energy density and safety,all-solid-state lithium-ion batteries(ASSLBs)with lithium-rich manganese-based materials(LRMs)are exploited as next-generation energy storage systems.However,the severe interfacial degradations with halide solid electrolytes(SEs)caused by the irreversible oxygen release remain to be urgently solved.In this work,we synthesized Cr-substituted LRMs with high capacity and stability.The reversible redox of Cr3+/Cr6+contributes to an enhanced capacity,accompanied by the reversible migration of Cr6+ions between octahedral and tetrahedral sites,effectively maintaining the structural stability of LRMs.Meanwhile,the strong Cr-O bond can stabilize the lattice oxygen,establish a stable cathode/electrolyte interface,and alleviate the voltage decay.Therefore,the ASSBs with LRMs-Cr0.1 cathode and halide electrolyte show an excellent cycling stability with 0.065%capacity decay per cycle for 500 cycles at 0.5C.Notably,the LRMs-Cr0.1//Li21Si5@Si/C full cell exhibits outstanding long-term cyclability over 1000 cycles with nearly 100%capacity retention at 0.3C,corresponding to an energy density of 413.11 Wh kg-1.This work provides guidance for developing high energy-density solid-state batteries.