Patent ID: 7691534

Claim:
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.