Process for making electrode binding sizing agent of lithium ion secondary cell
A secondary battery and manufacturing method technology, applied in the direction of electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of production workers and surrounding environmental impact, recycling difficulties, etc., to save production control costs, improve production efficiency, and facilitate production Worker Health Effects
Inactive Publication Date: 2005-11-16
浙江华天电源科技有限公司
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Problems solved by technology
[0003] Since the birth of lithium-ion secondary batteries, organic solvent systems have been used to make positive and negative electrode bonding pastes, such as N-methylpyrrolidone-polyvinylidene fluoride (NMP-PVDF), conductive carbon black and active materials. One of them is the positive and negative electrode bonding slurry. This type of slurry has a large amount of organic solvents discharged into the air during the coating process, and it is very difficult to recycle, which has a great impact on production workers and the surrounding environment.
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Embodiment Construction
[0013] The present invention will be further elaborated below with specific examples.
[0014] A kind of manufacture method of the electrode of a kind of lithium-ion secondary battery of the present invention is used bonding paste, and its technological process is:
[0015] For positive electrode binder paste:
[0016] 1. Mix water and water-soluble polymer in a ratio of 30 parts: 37 parts by weight, and stir in a mixer for 2 hours;
[0017] The water-soluble polymer is formed by mixing and reacting organic silica gel cross-linking additives and modified polyethylene oxide, and the weight ratio of the two added is 1:30;
[0018] Said organic silica gel crosslinking additive is: aminoethyl-aminopropyl-methyl-dimethoxysilane, molecular weight is 206;
[0019] The modified polyethylene oxide is formed by adding a compound containing hydroxyl groups to polyethylene oxide at a temperature of 80 ° C and a pH of about 8 for modification reaction, and its molecular weight is between...
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The invention is a binding slurry making method of electrode of secondary lithium battery, for the anode, its components include water soluble polymer, electroactive substance, conductex and water solvent; the polymer is an organic silica-gel cross-linking additive plus modified polyethylene glycol oxide, and the electroacitve substance is a lithium- containing transition metal oxide; for the cathode, its components water soluble polymer, graphite and water solvent; in a given mixing proportion, it is made by adopting the steps of mixing, time-control blending, screening, etc. It can reduce polarization of the battery and increase capacity and specific energy of the battery.
Description
field of invention [0001] The invention relates to the technical field of manufacturing secondary batteries, in particular to a manufacturing method for an adhesive slurry containing electroactive substances used in electrode pole pieces during the production of lithium-ion secondary batteries. Background technique [0002] Lithium-ion batteries currently in production usually disperse electroactive materials containing oxide fillers or carbon or graphite fillers and other components in a solvent in the presence of polymers to form a slurry, coated After being applied to the electrode sheet, the solvent is evaporated, and the dispersion is deposited on the electrode sheet to obtain a positive or negative electrode according to the filler used. [0003] Since the birth of lithium-ion secondary batteries, organic solvent systems have been used to make positive and negative electrode bonding pastes, such as N-methylpyrrolidone-polyvinylidene fluoride (NMP-PVDF), conductive carb...
Claims
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IPC IPC(8): H01M4/04H01M4/139
CPCY02E60/10
Inventor 曾垂松陈志涛
Owner 浙江华天电源科技有限公司