CPC H01M 50/46 (2021.01) [H01M 4/1391 (2013.01); H01M 4/1393 (2013.01); H01M 4/1395 (2013.01); H01M 4/366 (2013.01); H01M 4/525 (2013.01); H01M 4/621 (2013.01); H01M 10/0525 (2013.01); H01M 10/0569 (2013.01); H01M 50/403 (2021.01); H01M 50/449 (2021.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] | 15 Claims |
1. A separator comprising:
a porous polymer substrate having a plurality of pores; and
a coating layer formed on at least one surface of the porous polymer substrate,
wherein the coating layer comprises a plurality of lithium-containing composite particles and a binder positioned on a whole or a part of a surface of the lithium-containing composite particles to connect and fix the lithium-containing composite particles with each other,
wherein the lithium-containing composite particles consist of a lithiated compound and a passivation film formed on a surface of the lithiated compound, and the passivation film comprises a solid electrolyte interface (SEI),
wherein the SEI film comprises one or more selected from the group consisting of LiF, LiOH, and Li2CO3,
wherein the lithiated compound comprises lithium silicide (LixSi, 0<x<4.4), and one or more selected from the group consisting of LixSn (0<x<4.4), LixGe (0<x<4.4), LixAl (0<x<3), LixSb (0<x<3), LixZn (0<x<1), Co—Li2O, Ni—Li2O, Fe—Li2O, LixC (0<x<0.17), Li4+xTi5O12 (0<x<3), LixMoO2 (0<x<4), LixTiO2 (0<x<3), LixV2O5 (0<x<5).
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8. A method for manufacturing a lithium secondary battery, comprising the steps of:
(S1) adding a mixture of a lithium-intercalatable material and lithium metal particles to an electrolyte, and agitating the mixture at room temperature and washing the mixture to obtain lithium-containing composite particles comprising lithium ions intercalated into the lithium-intercalatable material and a passivation film on a surface of the lithium-containing composite particles;
(S2) dispersing the lithium-containing composite particles in a solvent with a binder to obtain a slurry, and coating the slurry onto at least one surface of a porous polymer substrate having a plurality of pores, followed by drying, to obtain a separator having a coating layer comprising the lithium-containing composite particles; and
(S3) interposing the separator between a positive electrode and a negative electrode wherein the coating layer of lithium-containing composite particles is present at least on a surface of the porous polymer substrate that faces the negative electrode,
wherein the passivation film comprises a solid electrolyte interface (SEI) film formed by a reaction of lithium ions with the electrolyte.
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