Three-dimensional copper nanowire array current collector for lithium ion battery and production method of three-dimensional copper nanowire array current collector

Abstract

The invention relates to a three-dimensional copper nanowire array current collector for a lithium ion battery and a production method of the three-dimensional copper nanowire array current collector. The three-dimensional copper nanowire array current collector consists of a copper nanowire array growing on a copper surface. Red copper is employed as a cathode, a solution of sodium hydroxide or potassium hydroxide is employed as electrolyte, stainless steel is employed as an anode, and a saturated mercury chloride electrode is employed as a reference electrode. The production method comprises the following steps of (1) introducing inert gas into an electrolytic bath to remove oxygen, controlling the current density, and electro-oxidizing the cathode to form a Cu(OH)2 thin film on the surface of the red copper to obtain a Cu(OH)2 nanowire array; (2) placing the Cu(OH)2 nanowire array in a hydrogen atmosphere, thermally reducing the Cu(OH)2 nanowire array in a reactor, and naturally cooling to room temperature to obtain the three-dimensional copper nanowire array current collector. A product has high electrical conductivity and an ultra-large specific surface area, and can be produced at a low reaction temperature by simple procedures without a template; a three-dimensional Cu nanowire array has a controllable morphological structure and high uniformity.

Description

(1) Technical field [0001] The invention relates to a three-dimensional copper nanowire array current collector for a lithium ion battery and a preparation method thereof. (2) Background technology [0002] In recent years, lithium-ion batteries have been gradually applied in mobile electronic devices, electric vehicles, backup energy storage, smart grid and other fields, however, it is still difficult to meet the power requirements of electric tools, electric vehicles (EVs), and hybrid electric vehicles (PHEVs). Density, energy density requirements. The design of traditional lithium-ion battery electrodes is to mix the cathode and anode active materials with conductive agent (carbon), binder, etc. in proportion, and spray them on the aluminum foil and copper foil current collectors respectively. The result of this design is that the active material is not directly connected to the current collector, the electron transport ability is poor, it is easy to fall off and...

AI Technical Summary

Problems solved by technology

At present, there have been reports on the preparation of micro / nano array current collectors (Nat. Mater. 2006, 5, 567; Electrochem. Commun. 2008, 10, 1467; Adv. Mater. 2010, 22, 4978), however, there is copper foil The current collector has poor adhesion to the active material and is easy to fall off, resulting in poor electrochemical cycle performance. At the same time, there are problems such as complicated preparation procedures, templates are required, and commercialization is difficult.

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