Compound lithium strip production device and method

Abstract

The invention relates to a compound lithium strip production device and a compound lithium strip production method. The device comprises a winding and unwinding mechanism, a laminating roller and a power supply piece. The method comprises the following steps: 1, laminating a strip-shaped lithium source, a solid electrolyte and a compound lithium strip matrix, enabling the strip-shaped solid electrolyte to be located between the strip-shaped lithium source and the strip-shaped compound lithium strip matrix during fitting; 2, respectively electrically connecting the strip-shaped lithium source with a positive electrode of a power supply and electrically connecting the compound lithium strip matrix with a negative electrode of the power supply; 3, switching on power supply, enabling the lithium ion of the lithium source to penetrate through the solid electrolyte to move towards the compound lithium strip matrix according to the electrochemical reaction between the positive electrode and the negative electrode, reducing the electron on the compound lithium strip matrix, and producing the metal lithium so as to obtain a compound lithium strip. The invention provides the novel technologyfor producing the compound lithium strip, a lithium layer is electroplated on the compound lithium strip matrix through an electrochemical method, the procedure is simple and efficient, the electroplated lithium layer is even in thickness and is quite thin, and the strict requirement of the compound lithium strip on the thickness is met.

Description

technical field [0001] The invention relates to a production device and a production method of a composite lithium strip. Background technique [0002] Lithium-sulfur batteries are one of the directions of battery development in the future. Lithium-sulfur batteries usually use metal lithium as the negative electrode material. The theoretical specific capacity of lithium is as high as 3860mAh / g, and usually a thin layer of metal lithium (less than 100 μm) can meet the capacity requirement, so ultra-thin metal lithium strips have potential market demand. Due to its own physical characteristics, the tensile strength of lithium metal strips is poor, and it is easy to wrinkle and break, and the smaller the thickness, the greater the chance of wrinkling and breakage. Therefore, a foil material (such as copper foil) with high tensile strength is generally selected as the composite lithium strip substrate, and a layer of lithium strip is covered on it to form a composite lithium st...

AI Technical Summary

Problems solved by technology

However, there is no simple and effective composite lithium strip production device with small lithium layer thickness and small thickness error at each point on the market. If the thickness of the lithium layer is uneven or the thickness of the lithium layer is too large, it cannot meet the use requirements of the composite lithium strip.

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