Lithium electrode and lithium battery including same

Patent metadata

Field	Value
Publication number	US-2017117551-A1
Application number	US-201515318301-A
Country	US
Kind code	A1
Filing date	Jun 15, 2015
Priority date	Jun 13, 2014
Publication date	Apr 27, 2017
Grant date	—

Abstract

The present application relates to a lithium electrode and a lithium battery including the same.

First claim

1 . A lithium electrode comprising:
an electrode layer comprising lithium; and a protective layer which is provided on at least one surface of the electrode layer and comprises a lithium ion conductive polymer comprising at least one functional group selected from —SO 3 Li, —COOLi, and —OLi.

2 . The lithium electrode of claim 1 , wherein the lithium ion conductive polymer comprises a repeating unit represented by the following Chemical Formula D:

in Chemical Formula D,
R is a hydrocarbon group which is unsubstituted or substituted with at least one selected from a group consisting of fluorine, oxygen, nitrogen, and sulfur,
X is —SO 3 Li, —COOLi, or —OLi, and
y is 2 to 100,000.

3 . The lithium electrode of claim 2 , wherein Chemical Formula D is represented by the following Chemical Formula E:

in Chemical Formula E,
A is —OCF 2 CF(CF 3 )— or a direct bond,
k is an integer of 1 to 30,
s is an integer of 1 to 10, and
y is an integer of 2 to 100,000.

4 . The lithium electrode of claim 2 , wherein the repeating unit represented by Chemical Formula D has a weight average molecular weight of 500 or more and 1,000,000 or less.

5 . The lithium electrode of claim 1 , wherein the lithium ion conductive polymer comprises a copolymer comprising a repeating unit of the following Chemical Formula A and a repeating unit of the following Chemical Formula B:
X 1 —O—X 2 —O m   [Chemical Formula A]
X 3 —O—Y 1 —O n   [Chemical Formula B]
in Chemical Formulae A and B, m and n mean the number of repeating units, 1≦m≦500, and 1≦n≦500, X 1 , X 2 , and X 3 are the same as or different from each other, and are each independently represented by any one of the following Chemical Formulae 1 to 3,

in Chemical Formulae 1 to 3,
L 1 is a direct bond, or any one of —CZ 2 Z 3 —, —CO—, —O—, —S—, —SO 2 —, —SiZ 2 Z 3 —, and a substituted or unsubstituted divalent fluorene group,
Z 2 and Z 3 are the same as or different from each other, and are each independently any one of hydrogen, an alkyl group, a trifluoromethyl group (—CF 3 ), and a phenyl group,
S 1 to S 5 are the same as or different from each other, and are each independently hydrogen; deuterium; a halogen group; a cyano group; a nitrile group; a nitro group; a hydroxy group; a substituted or unsubstituted alkyl group; a substituted or unsubstituted cycloalkyl group; a substituted or unsubstituted alkoxy group; a substituted or unsubstituted alkenyl group; a substituted or unsubstituted silyl group; a substituted or unsubstituted boron group; a substituted or unsubstituted amine group; a substituted or unsubstituted aryl group; or a substituted or unsubstituted heteroaryl group,
a, b, c, p, and q are the same as or different from each other, and are each independently an integer of 0 or more and 4 or less,
p+q≦6,
a′ is an integer of 1 or more and 5 or less,

in Chemical Formula B, Y 1 is represented by any one of the following Chemical Formulae 4 to 6,

in Chemical Formulae 4 to 6,
L 2 is a direct bond, or any one selected from —CO—, —SO 2 —, and a substituted or unsubstituted divalent fluorene group,
d, e, f, g, and h are the same as or different from each other, and are each independently an integer of 0 or more and 4 or less,
f+g≦6,
b′ is an integer of 1 or more and 5 or less, and
T 1 to T 5 are the same as or different from each other, and each independently, at least one is —SO 3 Li, —COOLi, or —OLi, and the others are the same as or different from each other, and are each independently hydrogen; deuterium; a halogen group; a cyano group; a nitrile group; a nitro group; a hydroxy group; a substituted or unsubstituted alkyl group; a substituted or unsubstituted cycloalkyl group; a substituted or unsubstituted alkoxy group; a substituted or unsubstituted alkenyl group; a substituted or unsubstituted silyl group; a substituted or unsubstituted boron group; a substituted or unsubstituted amine group; a substituted or unsubstituted aryl group; or a substituted or unsubstituted heteroaryl group.

6 . The lithium electrode of claim 5 , wherein X 1 , X 2 , and X 3 are the same as or different from each other, and are each independently any one selected from the following structural formulae:

in the structural formulae, R and R′ are the same as or different from each other, and are each independently —NO 2 or —CF 3 .

7 . The lithium electrode of claim 5 , wherein Y 1 is any one selected from the following structural formulae:

in the structural formulae, Q is —SO 3 Li, —COOLi, or —OLi, and Q′ is hydrogen, —SO 3 Li, —COOLi, or —OLi.

8 . The lithium electrode of claim 5 , wherein the copolymer further comprises a repeating unit of the following Chemical Formula C:

in Chemical Formula C, Z is a trivalent organic group.

9 . The lithium electrode of claim 8 , wherein Z is represented by the following Chemical Formula C-1 or C-2:

in Chemical Formulae C-1 and C-2,
Z 1 is represented by any one of the following Chemical Formulae 7 to 9,

in Chemical Formulae 7 to 9,
L 3 to L 6 are the same as or different from each other, and are each independently a direct bond, or —O—, —CO—, or —SO 2 —,
E 1 to E 7 are the same as or different from each other, and are each independently hydrogen; deuterium; a halogen group; a cyano group; a nitrile group; a nitro group; a hydroxy group; a substituted or unsubstituted alkyl group; a substituted or unsubstituted cycloalkyl group; a substituted or unsubstituted alkoxy group; a substituted or unsubstituted alkenyl group; a substituted or unsubstituted silyl group; a substituted or unsubstituted boron group; a substituted or unsubstituted amine group; a substituted or unsubstituted alkylamine group; a substituted or unsubstituted aralkylamine group; a substituted or unsubstituted arylamine group; a substituted or unsubstituted heteroarylamine group; a substituted or unsubstituted aryl group; a substituted or unsubstituted heteroaryl group; a substituted or unsubstituted fluorenyl group; or a substituted or unsubstituted carbazole group,
c′, d′, e′, and h′ are the same as or different from each other, and are each independently an integer of 0 or more and 4 or less,
f′, g′, and i′ are the same as or different from each other, and are each independently an integer of 0 or more and 3 or less, and
X 4 and X 5 are each independently the same as the definition of X 3 or Y 1 of C

Assignees

• Lg Chemical Ltd

Inventors

• Choi Junghun
• Jang Minchul
• Kwon Kiyoung
• Son Byoungkuk
• Lee Seong Ho
• Park Intae
• Park Changhun

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title