Negative electrode active material for lithium ion secondary battery, negative electrode, and lithium ion secondary battery including the same
The present disclosure relates to a negative electrode active material for a lithium ion secondary battery, a negative electrode, and a lithium ion secondary battery including the same. In the present disclosure, a crown ether-based host material which is a compound allowing selective coordination bonding with a lithium ion and having a similar cavity size to ions is included in the negative electrode active material, thereby suppressing lithium precipitation on the surface of the negative electrode active material to improve high rate charge/discharge characteristics of the battery, and also the crown ether-based host material solution is coated on the negative electrode active material layer of the battery to facilitate migration of lithium ions at high rate to improve an insertion/extraction speed of lithium ions during charge/discharge of the battery.
1 . A negative electrode active material for a lithium ion secondary battery, comprising:
a core layer comprising a metal-based material; and
a coating layer comprising a crown ether-based host material,
wherein the metal-based material is carbon (C) and does not contain silicon (Si),
wherein the coating layer is present as a different phase on the surface of the core layer without forming a compound by a chemical bond between the metal-based material of the core layer and the crown ether-based material, and
wherein the crown ether-based host material does not contain silane functional groups.
2 . The negative electrode active material for a lithium ion secondary battery of claim 1 , wherein
the crown ether-based host material is a cyclic compound comprising two or more alkylene oxide units represented by the following Chemical Formula 1:
wherein
n is an integer of 1 to 3.
3 . The negative electrode active material for a lithium ion secondary battery of claim 1 , wherein
the crown ether-based host material is a 12- to 18-crown ether-based compound comprising any one or more atoms of N and S.
4 . The negative electrode active material for a lithium ion secondary battery of claim 1 , wherein
the crown ether-based host material is one or more selected from the group consisting of 12-crown-4 ether, 14-crown-4 ether, tetrathia-14-crown-4 ether, dibenzo-14-crown-4 ether, didecalino-14-crown-4 ether, decalino-14-crown-4 ether, 15-crown-5 ether, 16-crown-4 ether, 16-crown-5 ether, and 18-crown-6 ether.
5 . The negative electrode active material for a lithium ion secondary battery of claim 1 , wherein
the crown ether-based host material is included at 0.1 wt % to 5.0 wt % with respect to a weight of the negative electrode active material.
6 . A negative electrode for a lithium ion secondary battery comprising:
a current collector; and
a negative electrode active material layer comprising the negative electrode active material of claim 1 , formed on the current collector.
7 . The negative electrode for a lithium ion secondary battery of claim 6 , further comprising:
a crown ether-based host material layer on the negative electrode active material layer.
8 . The negative electrode for a lithium ion secondary battery of claim 7 , wherein
the crown ether-based host material layer comprises a cyclic compound comprising two or more alkylene oxide units represented by the following Chemical Formula 1:
wherein
n is an integer of 1 to 3.
9 . The negative electrode for a lithium ion secondary battery of claim 7 , wherein
the crown ether-based host material layer comprises a 12- to 18-crown ether-based host compound comprising any one or more atoms of N and S.
10 . The negative electrode for a lithium ion secondary battery of claim 7 , wherein
the crown ether-based host material layer comprises one or more selected from the group consisting of 12-crown-4 ether, 14-crown-4 ether, tetrathia-14-crown-4 ether, dibenzo-14-crown-4 ether, didecalino-14-crown-4 ether, decalino-14-crown-4 ether, 15-crown-5 ether, 16-crown-4 ether, 16-crown-5 ether, and 18-crown-6 ether.
11 . The negative electrode for a lithium ion secondary battery of claim 7 , wherein
the crown ether-based host material layer is included at 0.1 wt % to 5.0 wt % with respect to a weight of the negative electrode active material layer.
12 . A lithium ion secondary battery comprising:
the negative electrode for a lithium ion secondary battery of claim 6 ; and
a positive electrode.