A gradient oxy-thiophosphate-coated Ni-rich layered oxide cathode for stable all-solid-state Li-ion batteries

Abstract High-energy Ni-rich layered oxide cathode materials such as LiNi 0.8 Mn 0.1 Co 0.1 O 2 (NMC811) suffer from detrimental side reactions and interfacial structural instability when coupled with sulfide solid-state electrolytes in all-solid-state lithium-based batteries. To circumvent this issue, here we propose a gradient coating of the NMC811 particles with lithium oxy-thiophosphate (Li 3 P 1+x O 4 S 4x ). Via atomic layer deposition of Li 3 PO 4 and subsequent in situ formation of a gradient Li 3 P 1+x O 4 S 4x coating, a precise and conformal covering for NMC811 particles is obtained. The tailored surface structure and chemistry of NMC811 hinder the structural degradation associated with the…

• NN
  National Natural Science Foundation of China

  Awards: JCYJ20190809181601639, 12004156
• M
  Mitacs
• NS
  Natural Sciences and Engineering Research Council of Canada