| abstract |
The invention belongs to the technical field of lithium ion batteries, and in particular relates to a negative electrode sheet of a lithium ion battery, comprising a negative electrode current collector and a negative electrode active material layer coated on the surface of the negative electrode current collector, and the negative electrode active material layer includes a negative electrode active material, a conductive agent, a dispersion Agent, binder and thickener, dispersant, binder and thickener are acrylic polymers whose relative molecular weights increase sequentially. In the invention, the dispersant sodium carboxymethyl cellulose, the binder styrene-butadiene rubber and the thickening agent sodium carboxymethyl cellulose are respectively replaced with acrylic polymers whose relative molecular weights increase in sequence, so as to improve the resistance of the negative electrode active material layer to the electrolyte. The affinity is conducive to the conduction of metal ions and promotes the transport of lithium ions at the electrode-electrolyte interface, so as to improve the rate charge and discharge performance of lithium ion batteries. In addition, under low temperature conditions, acrylic polymer can accelerate the transport of lithium ions by increasing the affinity for the electrolyte, thereby improving the low temperature performance of lithium ion batteries. |