Binder for rechargeable lithium battery, negative electrode including same, and rechargeable lithium battery including same
Disclosed are a binder for a rechargeable lithium battery, a negative electrode including the binder, and a rechargeable lithium battery including the negative electrode. The binder may include a copolymer of a polymer electrolyte, a conductive polymer, and a polydentate chelating agent.
1 . A binder for a rechargeable lithium battery, the binder comprising:
a copolymer, the copolymer being a polymerized product of a polymer electrolyte, a conductive polymer, and a polydentate chelating agent.
2 . A negative electrode for a rechargeable lithium battery, the negative electrode comprising:
a negative active material layer comprising a first binder, a cellulose-based compound, a second binder, and a negative active material,
wherein the first binder comprises a copolymer, the copolymer being a polymerized product of a polymer electrolyte, a conductive polymer, and a polydentate chelating agent.
3 . The negative electrode of claim 2 , wherein an amount of the first binder is about 0.01 wt % to about 30 wt % based on the total weight, 100 wt %, of the negative active material layer.
4 . The negative electrode of claim 2 , wherein a mixed amount of the cellulose-based compound and the second binder is about 1 wt % to about 30 wt % based on the total weight, 100 wt %, of the negative active material layer.
5 . The negative electrode of claim 2 , wherein a mixing ratio of the first binder and (the cellulose-based compound and the second binder) is about 1:99 to about 99:1 weight ratio.
6 . The negative electrode of claim 2 , wherein an amount of the polymer electrolyte is about 30 wt % to about 95 wt % based on 100 wt % of the first binder, an amount of the conductive polymer is about 2 wt % to about 60 wt % based on 100 wt % of the first binder, and an amount of the polydentate chelating agent is about 3 wt to about 68 wt % based on 100 wt % of the first binder.
7 . The negative electrode of claim 2 , wherein a mixing ratio of the polymer electrolyte, the conductive polymer, and the polydentate chelating agent is about 1:0.02 to 10:0.03 to 10 weight ratio.
8 . The negative electrode of claim 2 , wherein the polymer electrolyte comprises a polymer electrolyte having at least one functional group selected from among a carbonyl group, an undissociated functional group (RH), a carboxylic acid group, a sulfonic acid group, a, phosphoric acid group, an ether group, and an amine group.
9 . The negative electrode of claim 2 , wherein the polymer electrolyte comprises poly(2-acrylamido-2-methyl-1-propanesulfonic acid), polyacrylic acid, poly(meth)acrylic acid, or a combination thereof.
10 . The negative electrode of claim 2 , wherein the conductive polymer comprises poly(3,4-ethylene dioxythiophene), polyaniline, polypyrrole, polyfuran, polythiophene, polyselenophene, 3,4-propylenedioxythiophene-2,5-dicarboxylic acid (ProDOT), or a combination thereof.
11 . The negative electrode of claim 2 , wherein:
the polydentate chelating agent comprises 2 to 6 acidic functional groups or basic functional groups.
12 . The negative electrode of claim 11 , wherein:
the acidic functional group or the basic functional group is a carboxylic acid group, a sulfonic acid group, a phosphoric acid group, or a hydroxy group.
13 . The negative electrode of claim 2 , wherein the polydentate chelating agent comprises phytic acid, tannic acid, or a combination thereof.
14 . The negative electrode of claim 2 , wherein the negative active material comprises a silicon-based negative active material.
15 . A rechargeable lithium battery, comprising:
the negative electrode of claim 2 ;
a positive electrode; and
an electrolyte.
16 . The rechargeable lithium battery of claim 15 , wherein an amount of the first binder is about 0.01 wt % to about 30 wt % based on the total weight, 100 wt %, of the negative active material layer.
17 . The rechargeable lithium battery of claim 15 , wherein a mixed amount of the cellulose-based compound and the second binder is about 1 wt % to about 30 wt % based on the total weight, 100 wt %, of the negative active material layer.
18 . The rechargeable lithium battery of claim 15 , wherein a mixing ratio of the first binder and (the cellulose-based compound and the second binder) is about 1:99 to about 99:1 weight ratio.
19 . The rechargeable lithium battery of claim 15 , wherein an amount of the polymer electrolyte is about 30 wt % to about 95 wt % based on 100 wt % of the first binder, an amount of the conductive polymer is about 2 wt % to about 60 wt % based on 100 wt % of the first binder, and an amount of the polydentate chelating agent is about 3 wt to about 68 wt % based on 100 wt % of the first binder.
20 . The rechargeable lithium battery of claim 15 , wherein the negative active material comprises a silicon-based negative active material.