Cathode and battery including same
View Patent ↗A cathode and a battery including the cathode are provided. The cathode includes a cathode mixture layer with a cathode active material and a binder. The binder can include, for example, a synthetic rubber latex and a thickener, polyvinylidene fluoride denaturalized by maleic acid and/or the like.
1. A cathode comprising:
a cathode mixture layer including a cathode active material and a binder, the binder including a styrene butadiene latex adhesive and a thickener
wherein the content of the styrene butadiene latex adhesive ranges from about 2 wt % to about 4 wt % of the total mass of the mixture cathode layer, the content of the thickener ranges from about 0.5 wt % to about 2.5 wt % of the total mass of the cathode mixture layer, and the thickener is polyacrylic acid, and
wherein the cathode active material consists of a lithium iron phosphorous oxide and a carbon material, the lithium iron phosphate oxide having an olivine structure and the content of the carbon material being in the range of from about 5 wt % to about 12 wt % with respect to the total amount of the cathode active material.
2. The cathode of claim 1 , wherein the ratio of styrene-butadiene latex adhesive to polyacrylic acid is between about 0.8:1 to about 4:1 by mass.
3. The cathode of claim 1 wherein the styrene-butadiene latex adhesive and polyacrylic acid represent greater than 2.3% weight and less than 6% weight of the cathode mixture layer.
4. The cathode of claim 1 wherein the styrene-butadiene latex adhesive and polyacrylic acid represent from about 2.5% to about 5% weight of the cathode mixture layer.
5. A battery comprising:
a cathode, the cathode including a cathode mixture layer containing a cathode active material, and a binder including a styrene butadiene latex adhesive and a thickener;
an anode; and
an electrolyte,
wherein the content of the styrene butadiene latex adhesive ranges from about 2 wt % to about 4 wt % of the total mass of the cathode mixture layer, wherein the content of the thickener ranges from about 0.5 wt % to about 2.5 wt % of the total mass of the cathode mixture layer and the thickener is polyacrylic acid, and wherein the battery has a charge final voltage of about 4.0 V or less, and
wherein the cathode active material consists of a lithium iron phosphorous oxide and a carbon material, the lithium iron phosphate oxide having an olivine structure and the content of the carbon material being in the range of from about 5 wt % to about 12 wt % with respect to the total amount of the cathode active material.
6. The battery of claim 5 , wherein the ratio of styrene-butadiene latex adhesive to polyacrylic acid is between about 0.8:1 to about 4:1 by mass.
7. The battery of claim 5 wherein the styrene-butadiene latex adhesive and polyacrylic acid represent greater than 2.3% weight and less than 6% weight of the cathode mixture layer.
8. The battery of claim 5 wherein the styrene-butadiene latex adhesive and polyacrylic acid represent from about 2.5% to about 5% weight of the cathode mixture layer.