Method for manufacturing electrode for lithium ion secondary battery
A secondary battery and manufacturing method technology, applied in battery electrodes, secondary batteries, electrode manufacturing, etc., can solve the problems of low adhesive strength, easy peeling of ends, easy sliding of active materials, etc.
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no. 1 Embodiment approach
[0025] The manufacturing method disclosed here is a method of manufacturing electrodes (a positive electrode and a negative electrode) having a structure in which an active material layer is held on a long current collector. figure 1 It is a schematic diagram showing the manufacturing apparatus 10 which concretely implements the manufacturing process of the electrode which concerns on one Embodiment of this invention. Such a manufacturing apparatus 10 can be used in both the positive electrode forming process and the negative electrode forming process. Here, if figure 1 As shown, the manufacturing apparatus 10 has a conveyance unit 22 , a binder solution application unit 21 , a granulated particle supply unit 24 , a scraping member 25 , and pressing rollers 26 and 27 . Here, the transport unit 22 is a device for transporting the current collector 12 . The adhesive liquid application unit 21 is a device for applying the adhesive liquid 21a. The granulated particle supply uni...
no. 2 Embodiment approach
[0068] The manufacturing method of the electrode for lithium ion secondary batteries of 2nd Embodiment contains the following process similarly to 1st Embodiment mentioned above.
[0069] (a) Step of forming adhesive coating
[0070] (b) Supply process of granulated particles
[0071] (c) Leveling process
[0072] (d) Pressing process
[0073] (e) Cutting process
[0074] here, Figure 5 The adhesive coating layer 16 formed on the current collector 12 in the adhesive coating layer forming step a of the second embodiment is schematically shown. Figure 5 The dotted line in represents the cutting point P where cutting is planned in the cutting process e. Such as Figure 5 As shown, in the second embodiment, except for the end portions 16E (the first large-volume coating area 18A) provided on both sides of the adhesive coating layer 16, the large-volume coating area where the coating amount of the adhesive liquid is relatively large ), which is different from the above-men...
Embodiment
[0096] A positive electrode sheet was fabricated as follows. By using LiNi as the positive active material 1 / 3 co 1 / 3 mn 1 / 3 o 2 Powder (average particle size: 4 μm to 5 μm), AB as a conductive material, acrylate polymer as a binder, CMC-Na as a tackifier, and LEOCOL (registered trademark: Lion Corporation) as a surfactant Co., Ltd.) and water were put into a planetary disperser and mixed uniformly to prepare a preparation solution for forming positive electrode granulated particles. Then, by spraying this prepared solution, removing the solvent in a droplet state and drying, a powder of positive electrode granulated particles having an average particle diameter of 75 μm was obtained.
[0097] Next, prepare a binder liquid (40% by mass of solid fraction) in which SBR as a binder is dispersed in water, and use such as figure 1In the production apparatus as shown, the binder liquid was pattern-coated by gravure printing on one side of a positive electrode current collector ...
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Abstract
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