| CPC H01M 4/366 (2013.01) [C01G 53/42 (2013.01); H01M 4/485 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/62 (2013.01); H01M 10/0525 (2013.01); H01M 10/0562 (2013.01); C01P 2002/52 (2013.01); C01P 2002/85 (2013.01); C01P 2004/84 (2013.01); C01P 2006/40 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01); H01M 2300/0068 (2013.01)] | 13 Claims |
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1. A positive electrode for an all-solid secondary battery,
the positive electrode comprising a positive active material and a sulfide-based solid electrolyte,
wherein:
the positive active material has a structure containing a core and a shell,
the shell comprises a first nickel-based active material containing cobalt (Co), a thickness of the shell, comprising the first nickel-based active material containing cobalt, being in a range of about 5 nm to about 100 nm,
a surface of the positive active material comprises a coating layer comprising at least one lithium ion conductor selected from a lanthanum oxide and a lithium lanthanum oxide, a thickness of the coating layer being in a range of about 0.1 nm to about 50 nm,
an amount of the lithium ion conductor is in a range of about 0.1 parts to about 10 parts by weight based on 100 parts by weight of the total weight of the positive active material and the lithium ion conductor,
wherein an amount of the shell is in a range of about 0.3 parts to about 10 parts by weight based on 100 parts by weight of the total weight of the positive active material having the structure containing the core and the shell, and
wherein the positive electrode has a density of a mixture comprising the positive active material and the sulfide-based solid electrolyte in a range of about 3.4 g/cm3 to about 3.7 g/cm3.
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