Secondary lithium battery anode and secondary lithium battery including same
Disclosed are a secondary lithium battery anode and a secondary lithium battery including same, the secondary lithium battery anode comprising a current collector and an anode active material layer located on at least one surface of the current collector, wherein the anode active material layer includes an anode active material, which has sphericity of 0.83 to 0.91, and a binder, which has an average particle diameter (D50) of 180 nm to 450 nm.
1 . An anode for a secondary lithium battery, comprising:
a current collector, and an anode active material layer located on at least one surface of the current collector,
wherein the anode active material layer comprises an anode active material having sphericity of 0.85 to 0.91; and
a binder having an average particle diameter D50 of 400 nm to 450 nm,
wherein the anode active material is included in the anode active material layer in an amount from 98 wt % to 99.9 wt %,
the binder is included in an amount from 0.5 wt % to 1.5 wt % based on 100 wt % of the anode active material layer, and
wherein the binder consists of polyvinylchloride, carboxylated polyvinylchloride, polyvinylfluoride, a polymer including ethylene oxide, polyvinylpyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, polyamideimide, polyimide, styrene-butadiene rubber, acrylated styrene-butadiene rubber, or a combination thereof.
2 . The anode for a secondary lithium battery of claim 1 , wherein the sphericity of the anode active material is 0.85 to 0.87.
3 . The anode for a secondary lithium battery of claim 1 , wherein an amount ratio of the anode active material and the binder is 95:5 to 99:1 by weight ratio.
4 . The anode for a secondary lithium battery of claim 1 , wherein the anode active material is artificial graphite, natural graphite, or a combination thereof.
5 . The anode for a secondary lithium battery of claim 1 , wherein adherence between the current collector and the anode active material layer is 2 gf/mm to 4 gf/mm.
6 . A secondary lithium battery comprising:
a cathode;
an anode; and
an electrolyte,
wherein the anode is the anode according to claim 1 .
7 . The anode for a secondary lithium battery of claim 1 , wherein the binder consists of a polymer including ethylene oxide, polyvinylpyrrolidone, polyurethane, polytetrafluoroethylene, polyethylene, polypropylene, polyamideimide, polyimide, or a combination thereof.