Positive Electrode Active Material And Method For Manufacturing A Positive Electrode Active Material

Abstract: The present invention relates a positive electrode active material for solid-state batteries, comprising lithium, oxygen, nickel, and at least one metal selected from the group consisting of manganese and cobalt, wherein the positive electrode active material has an enriched amount of Si in the surface layer, and wherein the positive electrode active material comprises single-crystalline particles. The present inventors have surprisingly found that the positive electrode active material of the invention improves the storage stability of the positive electrode active material. In particular, a decreased uptake of water and carbon (or carbon dioxide) is observed by applying a surface layer of Si on the positive electrode active material. Moreover, the positive electrode active material improves the electrochemical stability of the battery.

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