Lithium battery power energy storage polymer positive and negative electrode special binder

Abstract

The invention discloses an adhesive special for a power energy-storage polymer positive electrode and a negative electrode of a lithium battery, and relates to an adhesive. The adhesive comprises the following components in parts by weight: 120 parts of an acrylic acid emulsion, 20-90 parts of an emulsifier, 20 parts of lithium hydroxide, 1-10 parts of polyacrylamide, 30 parts of a filler, 300 parts of diluents, 0.5-9 parts of carboxymethylcellulose, 0.1-6 parts of an antioxidant and 1.5-20 parts of an active agent. The adhesive special for the power energy-storage polymer positive electrode and the negative electrode of the lithium battery takes water as a solvent, and no organic solvent is volatilized in pulp combining and coating processes, so that the adhesive is safe, energy-saving and environment-friendly. A water-based adhesive is of excellent compatibility with a lithium ion electrolyte; if the adhesive is dipped in the electrolyte for 24 hours, the swelling ratio of an adhesive film is not greater than 0.8%, and the stability of the size of the electrode can be kept. The water-based adhesive is copolymerized by multi-element organic acid ester, the excellent balance of rigidity and flexibility of the adhesive film is realized, and the lithium ion battery manufactured by utilizing the water-based adhesive has the excellent cycle performance.

Description

technical field [0001] The present invention relates to a binder, in particular to a special binder for lithium battery power energy storage polymer positive and negative electrodes Background technique [0002] The adhesive used for the positive and negative electrodes of traditional lithium batteries generally uses PVDF, which has some defects: it cannot be well bonded to copper and aluminum foil, and it is easy to fall off and powder during the production of pole pieces and battery charging and discharging. Poor; not resistant to strong grinding and stirring, easy to break emulsion; cannot maintain stable performance in lithium battery positive electrode oxidation environment and negative electrode reducing environment; and has poor compatibility with lithium battery electrolyte, and cannot maintain electrode dimensional stability , thus greatly affecting the overall performance of the lithium battery. Contents of the invention [0003] In view of the deficiencies in t...

AI Technical Summary

Problems solved by technology

[0002] The adhesive used for the positive and negative electrodes of traditional lithium batteries generally uses PVDF, which has some defects: it cannot be well bonded to copper and aluminum foil, and it is easy to fall off and powder during the production of pole pieces and battery charging and discharging. Poor; not resistant to strong grinding and stirring, easy to break emulsion; cannot maintain stable performance in lithium battery positive electrode oxidation environment and negative electrode reducing environment; and has poor compatibility with lithium battery electrolyte, and cannot maintain electrode dimensional stability , thus greatly affecting the overall performance of the lithium battery