A positive electrode material for a lithium-ion battery, comprising: a positive electrode active material; a conductive agent; a binding agent; and an additive for the positive electrode material, comprising: an internal component comprising a silane coupling agent modified inorganic lithium salt; wherein the silane coupling agent modified inorganic lithium salt comprises an inorganic lithium salt and a silane coupling agent to modify the inorganic lithium salt; an external component formed on a surface of the internal component and comprising a polymer which is not an ion conductor and having a melting point of 60°C to 140°C, the internal component and the ex ternal component forming a core-shell structure together, and the shell having a porosity of 0.01% to 20%, wherein the inorganic lithium salt of the silane coupling agent modified inorganic lithium salt is at least one selected from the group consisting of: LiFe x Mn y M z PO 4, where 0≤x≤1, 0≤y≤1, 0≤z≤1, x+y+z=1, and M is at least one selected from the group consisting of Al, Mg, Ga, Ti, Cr, Cu, Zn and Mo; Li 3 V 2 (PO 4) 3; LiNi 0.5-x Mn 1.5-y M x+y O 4, where -0.1≤x≤0.5, 0≤y≤1.5, and M is at least one selected from the group consisting of Li, Co, Fe, Al, Mg, Ca, Ti, Mo, Cr, Cu and Zn; LiVPO 4 F; Li 1+x L 1-y-z M y N z O 2, where L, M, N are independently selected from the group consisting of Li, Co, Mn, Ni, Fe, Al, Mg, Ga, Ti, Cr, Cu, Zn, Mo, F, I, S and B, -0.1≤x≤0.2, 0≤y≤1, 0≤z≤1, 0≤y+z≤1.0; Li 2 CuO 2; and Li 5 FeO 4; wherein the positive electrode active material has a charging voltage larger than that of the inorganic lithium salt. a positive electrode active material; a conductive agent; a binding agent; and an additive for the positive electrode material, comprising: an internal component comprising a silane coupling agent modified inorganic lithium salt; wherein the silane coupling agent modified inorganic lithium salt comprises an inorganic lithium salt and a silane coupling agent to modify the inorganic lithium salt; an external component formed on a surface of the internal component and comprising a polymer which is not an ion conductor and having a melting point of 60°C to 140°C, the internal component and the ex ternal component forming a core-shell structure together, and the shell having a porosity of 0.01% to 20%, wherein the inorganic lithium salt of the silane coupling agent modified inorganic lithium salt is at least one selected from the group consisting of: LiFe x Mn y M z PO 4, where 0≤x≤1, 0≤y≤1, 0≤z≤1, x+y+z=1, and M is at least one selected from the group consisting of Al, Mg, Ga, Ti, Cr, Cu, Zn and Mo; Li 3 V 2 (PO 4) 3; LiNi 0.5-x Mn 1.5-y M x+y O 4, where -0.1≤x≤0.5, 0≤y≤1.5, and M is at least one selected from the group consisting of Li, Co, Fe, Al, Mg, Ca, Ti, Mo, Cr, Cu and Zn; LiVPO 4 F; Li 1+x L 1-y-z M y N z O 2, where L, M, N are independently selected from the group consisting of Li, Co, Mn, Ni, Fe, Al, Mg, Ga, Ti, Cr, Cu, Zn, Mo, F, I, S and B, -0.1≤x≤0.2, 0≤y≤1, 0≤z≤1, 0≤y+z≤1.0; Li 2 CuO 2; and Li 5 FeO 4; wherein the positive electrode active material has a charging voltage larger than that of the inorganic lithium salt. an internal component comprising a silane coupling agent modified inorganic lithium salt; wherein the silane coupling agent modified inorganic lithium salt comprises an inorganic lithium salt and a silane coupling agent to modify the inorganic lithium salt; an external component formed on a surface of the internal component and comprising a polymer which is not an ion conductor and having a melting point of 60°C to 140°C, the internal component and the ex ternal component forming a core-shell structure together, and the shell having a porosity of 0.01% to 20%, wherein the inorganic lithium salt of the silane coupling agent modified inorganic lithium salt is at least one selected from the group consisting of: LiFe x Mn y M z PO 4, where 0≤x≤1, 0≤y≤1, 0≤z≤1, x+y+z=1, and M is at least one selected from the group consisting of Al, Mg, Ga, Ti, Cr, Cu, Zn and Mo; Li 3 V 2 (PO 4) 3; LiNi 0.5-x Mn 1.5-y M x+y O 4, where -0.1≤x≤0.5, 0≤y≤1.5, and M is at least one selected from the group consisting of Li, Co, Fe, Al, Mg, Ca, Ti, Mo, Cr, Cu and Zn; LiVPO 4 F; Li 1+x L 1-y-z M y N z O 2, where L, M, N are independently selected from the group consisting of Li, Co, Mn, Ni, Fe, Al, Mg, Ga, Ti, Cr, Cu, Zn, Mo, F, I, S and B, -0.1≤x≤0.2, 0≤y≤1, 0≤z≤1, 0≤y+z≤1.0; Li 2 CuO 2; and Li 5 FeO 4; wherein the positive electrode active material has a charging voltage larger than that of the inorganic lithium salt. LiFe x Mn y M z PO 4, where 0≤x≤1, 0≤y≤1, 0≤z≤1, x+y+z=1, and M is at least one selected from the group consisting of Al, Mg, Ga, Ti, Cr, Cu, Zn and Mo; Li 3 V 2 (PO 4) 3; LiNi 0.5-x Mn 1.5-y M x+y O 4, where -0.1≤x≤0.5, 0≤y≤1.5, and M is at least one selected from the group consisting of Li, Co, Fe, Al, Mg, Ca, Ti, Mo, Cr, Cu and Zn; LiVPO 4 F; Li 1+x L 1-y-z M y N z O 2, where L, M, N are independently selected from the group consisting of Li, Co, Mn, Ni, Fe, Al, Mg, Ga, Ti, Cr, Cu, Zn, Mo, F, I, S and B, -0.1≤x≤0.2, 0≤y≤1, 0≤z≤1, 0≤y+z≤1.0; Li 2 CuO 2; and Li 5 FeO 4; wherein the positive electrode active material has a charging voltage larger than that of the inorganic lithium salt.