Anode active material-containing slurry, anode using the slurry and electrochemical device comprising the anode

摘要

The present disclosure relates to an anode active material-containing slurry, an anode using the slurry, and an electrochemical device comprising the anode. More specifically, the present disclosure relates to a slurry comprising an anode active material; a polymer binder comprising styrene butadiene rubber and potassium polyacrylate; a conductive material; and a dispersing medium, an anode using the slurry, and an electrochemical device comprising the anode. The anode active material-containing slurry according to one aspect of the present disclosure can relieve the volume expansion of an anode active material by the intercalation and disintercalation of lithium during cycles of electrochemical devices to improve the durability of an anode active material layer, thereby enhancing the life characteristics of the electrochemical devices, and can form an anode active material layer having a high peeling force even though potassium polyacrylate with a relatively lower weight-average molecular weight is used.

主权项

1. An anode active material-containing slurry for a lithium secondary battery, comprising:
an anode active material for a lithium secondary battery, wherein the anode active material intercalates and deintercalates lithium; a polymer binder consisting of styrene butadiene rubber and potassium polyacrylate; a conductive material; and a dispersing medium, wherein the potassium polyacrylate is produced by a neutralization reaction of polyacrylic acid and potassium hydroxide (KOH), the polyacrylic acid has a weight-average molecular weight of 400,000 to 800,000, and the slurry has a viscosity of 7 to 56 Pa·s at 23° C. and a shear rate of 0.1 to 1 s−1.