cu 2 nb 34 o 87 Preparation method of button cell negative electrode sheet

Abstract

The invention relates to the field of lithium ion battery production, specifically a Cu 2 Nb 34 o 87 The preparation method of the button battery negative electrode sheet, it comprises the following steps: S1 adopts solid-phase method to synthesize Cu 2 Nb 34 o 87 Materials; S2 synthesized Cu with an ink shaker 2 Nb 34 o 87 The material was ball milled, and the Cu 2 Nb 34 o 87 The material is ball milled to the required particle size; S3 ball milled Cu 2 Nb 34 o 87 The material is put into the sieve of 100-800 mesh ultrasonic vibrating sieve and sieved to obtain Cu with required particle size. 2 Nb 34 o 87 Active material; S4 will sieve Cu 2 Nb 34 o 87 The active material, binder, and conductive agent are configured into a slurry; S5 coats the configured slurry on the current collector, first dries it on the coating machine, and then moves it into a vacuum oven for drying; S6 dries it The pole piece is put into the roller press and rolled to make Cu 2 Nb 34 o 87 Button battery negative plate. The preparation method of the present invention can obtain Cu with small particle size and good crystallinity 2 Nb 34 o 87 material, the slurry made is more uniform, and the coating effect is better; the slurry ratio is optimized, and the button battery negative electrode sheet density is high, which can greatly improve the energy density of the button battery.

Description

technical field [0001] The invention belongs to the field of lithium ion battery production, in particular to a high surface density Cu 2 Nb 34 o 87 The invention discloses a method for preparing a negative electrode sheet of a button battery. Background technique [0002] Lithium-ion battery anode material Cu 2 Nb 34 o 87 , excellent electrochemical performance, and has the potential for large-scale industrialization in the future. Currently preparing Cu 2 Nb 34 o 87 The production usually adopts the solid phase method. When synthesizing, CuO and Nb 2 o 5 Mix evenly according to a certain ratio, and sinter at high temperature in a muffle furnace to make Cu 2 Nb 34 o 87 . Synthesis of Cu by solid phase method 2 Nb 34 o 87 The cost is the lowest, but the sintering temperature is high, resulting in the Cu 2 Nb 34 o 87 Particles are agglomerated and the particle size is too large. When preparing lithium-ion battery electrode slurry, it is not easy to mix eve...

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Problems solved by technology

Synthesis of Cu by solid phase method 2 Nb 34 o 87 The cost is the lowest, but the sintering temperature is high, resulting in the Cu 2 Nb 34 o 87 Particles are agglomerated and the particle size is too large. When preparing lithium-ion battery electrode slurry, it is not easy to mix evenly because the particles are too large, which will affect the coating effect, and too large particles will lead to poor electrochemical performance of the battery.

Cu 2 Nb 34 o 87 Grind to the desired particle size, and the ball-milled Cu 2 Nb 34 o 87 The material also contains some non-crystalline substances, which affect the Cu 2 Nb 34 o 87 The electrochemical performance of the material, in order to ensure its performance, the material after ball milling must be sieved. If it is sieved by ordinary sieving equipment, Cu 2 Nb 34 o 87 The material particles will stick to the screen, causing the blockage of the screen, and the screening cannot be completed. Therefore, there is no effective way in the prior art to make the Cu produced by the solid phase method 2 Nb 34 o 87 The particle size and crystallinity of the material satisfy Cu 2 Nb 34 o 87 Button battery negative plate demand

In addition, existing Cu 2 Nb 34 o 87 Button battery pole piece, the surface density of the negative electrode material on the button battery negative pole piece is low, which affects the energy density of the battery, so it needs to be improved

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