Anode for lithium secondary battery, method for manufacturing same, and lithium secondary battery including same
Disclosed is an anode for a lithium secondary battery, including a carbon-based anode active material, a binder and a conductive polymer, wherein the conductive polymer is in fiber form. A lithium secondary battery including the anode is also provided. As the anode for a lithium secondary battery includes a conductive polymer in fiber form, poor conductivity, which is a problem with a carbon-based anode active material, can be overcome, and the anode can be easily manufactured.
1. An anode for a lithium secondary battery, comprising a carbon-based anode active material, a binder and a conductive polymer, wherein the conductive polymer is in fiber form, wherein the conductive polymer is poly-3,4-ethylenedioxythiophene/polystyrenesulfonate (PEDOT/PSS), and wherein the conductive polymer is contained in an amount of 0.8 to 1.5 wt % based on a solid content of the anode.
2. The anode of claim 1 , wherein the binder is any one or a mixture of two or more selected from the group consisting of styrene-butadiene rubber, nitrile-butadiene rubber, methyl (meth)acrylate-butadiene rubber, chloroprene rubber, carboxy-modified styrene-butadiene rubber, carboxymethylcellulose (CMC), and modified polyorganosiloxane polymers.
3. The anode of claim 1 , wherein the carbon-based anode active material is any one or a mixture of two or more selected from the group consisting of soft carbon, hard carbon, natural graphite, Kish graphite, pyrolytic carbon, mesophase pitch based carbon fiber, meso-carbon microbeads, mesophase pitches, and petroleum or coal tar pitch derived cokes.
4. A method of manufacturing the anode of claim 1 , comprising:
(A) dispersing a carbon-based anode active material and a conductive polymer in a binder solution, thus preparing a slurry;
(B) applying the slurry on a surface of a current collector to be formed with an anode active material layer; and
(C) drying the current collector coated in (B),
wherein the conductive polymer is poly-3,4-ethylenedioxythiophene/polystyrenesulfonate (PEDOT/PSS), and wherein the conductive polymer is contained in an amount of 0.8 to 1.5 wt % based on a solid content of the anode.
5. A lithium secondary battery comprising a cathode, an anode and an electrolyte, wherein the anode is the anode of claim 1 .
6. A lithium secondary battery comprising a cathode, an anode and an electrolyte, wherein the anode is the anode of claim 2 .
7. A lithium secondary battery comprising a cathode, an anode and an electrolyte, wherein the anode is the anode of claim 3 .