Manufacturing method of lithium iron phosphate-cobalt acid lithium composite anode plate of lithium ion battery

Abstract

The invention discloses a manufacturing method of a lithium iron phosphate-cobalt acid lithium composite anode plate of a lithium ion battery, which comprises the following steps: A, ball-milling and uniformly mixing a nanometer cobalt acid lithium anode active material with a nanometer Super-C conductive agent in proportion to obtain a cobalt acid lithium active material mixture; uniformly mixing the mixture with polyvinylidene fluoride; mixing the mixture with sodium carboxymethylcellulose to obtain anode active material slurry; B, preparing the anode active material slurry: ball-milling and uniformly mixing nanometer lithium iron phosphate with the nanometer Super-C conductive agent in proportion to obtain a lithium iron phosphate active material mixture; mixing the mixture with the sodium carboxymethylcellulose in proportion; adding distilled water into the mixture, ball-milling and mixing uniformly to obtain anode active material slurry B; and C, coating the slurry A on a single surface of an anode current collector, and coating the slurry B on double surfaces of an initial pole piece according to coating process, thus obtaining an anode pole piece. A nickel-metal hydride battery prepared by the invention has high volume, high multiplying power, a good discharging effect, and long circulating service life.

Description

technical field [0001] The present invention relates to the field of battery manufacturing, and more specifically relates to a method for manufacturing lithium iron phosphate-lithium cobalt oxide composite positive electrodes for lithium-ion power batteries, which can be used to manufacture various types of primary and secondary lithium-ion batteries, especially for Manufacture of lithium-ion power batteries. Background technique [0002] At present, the manufacture of lithium-ion battery cathode sheets produced by the lithium-ion battery industry is generally made of active materials such as pure lithium iron phosphate, or lithium cobalt oxide or so-called ternary materials, conductive agent ultra-fine graphite powder (Super -C), binder polyvinylidene fluoride (PVDF), tackifier (swelling or increase binder solubility reagent) N-methylpyrrolidone (NMP), foaming agent or thickener carboxymethyl fiber Sodium sodium (CMC) and other additives are mixed to make a slurry. The slu...

AI Technical Summary

Problems solved by technology

However, the lithium-ion battery manufactured by the positive electrode manufactured by the existing lithium-ion battery positive pole piece process not only has the disadvantages of low specific capacity, poor high-current discharge effect, and short cycle life.

The lithium-ion battery made of pure lithium cobaltate positive electrode active material has a high working voltage (3.6-3.7V), but it has great safety hazards. Lithium cobaltate may decompose and release oxygen under relatively high stability conditions. , Oxygen and the organic electrolyte undergo oxidation-reduction reactions and explode; although lithium-ion batteries made of pure lithium iron phosphate positive electrode active materials do not have the same safety hazards as lithium cobalt oxide, lithium iron phosphate positive electrode active materials. The open-circuit voltage and working voltage of lithium-ion batteries are both low, the open-circuit voltage is about 3.05-3.30V, and the working voltage is generally between 3.00-3.20V

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