Patent ID: 11949095
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 28:
29. An electrochemical cell comprising:
a negative electrode;
an electrolyte comprising a composite solid electrolyte; and
a positive electrode having a NASICON type crystal structure and including elements of Li, Ti, Al, P, and O, wherein the composite solid electrolyte comprises a solid electrolyte, and a protective layer, wherein the protective layer is on a surface of the solid electrolyte and comprises a compound represented by Formula 1

LixM1yM2zOt+x/2   Formula 1, wherein in Formula 1,
M1 has a Gibbs reaction energy of greater than 0 electron-volts per mole,
M2 is Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Ga, Ge, Si, Al, W, Cd, Pd, Sn, Pb, Sc, Mg, Ca, Sr, Ba, or a combination thereof,

0<x<1, 0<y<1, 0<z<1, and 0<t<1,

provided that when M1 is Nb and z is 0, the compound represented by Formula 1 is Li0.33Nb0.33O and when M1 is Zr or Al, z 0, and
wherein the protective layer of the composite solid electrolyte is between the solid electrolyte and the positive electrode.