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

A technology of lithium-ion batteries and copper nanowires, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as poor adhesion between copper foil current collectors and active materials, poor electrochemical cycle performance, and complicated preparation procedures , to achieve good electrochemical performance, relieve volume change and stress, and shorten the effect of diffusion path

Inactive Publication Date: 2014-01-22
山东玉皇盛世化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 po...

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Soak a 1.5×1.5 cm copper strip in 0.1M hydrochloric acid solution for 3 minutes to remove oxides on the copper surface, then wash it with distilled water for 5 times, then wash it with ethanol for 3 times, and dry it for later use; configure the concentration of 2M KOH solution or NaOH solution is ready for use.

[0036] 2. Take the red copper strip as the anode, the 304 stainless steel sheet as the cathode, the saturated mercurous chloride electrode as the reference electrode, the distance between the anode and the cathode is about 3cm, and 2M KOH solution or NaOH solution as the electrolyte. Inert gas (high purity N 2 or Ar 2 etc.) about 30 min in addition to O 2 , and then controlled a constant current density of 2.5 mA / cm 2 , the anodic oxidation time is 12 min, and blue Cu(OH) is formed on the surface of the copper strip 2 The film was washed 3 times with distilled water and dried for later use.

[0037] 3. Generate blue Cu(OH) on the surface 2 The coppe...

Embodiment 2

[0044] 1. Soak a 1.5×1.5 cm copper strip in 1M hydrochloric acid solution for 5 minutes to remove oxides on the copper surface, then wash it with distilled water for 5 times, then wash it with ethanol for 3 times, and dry it for later use; prepare KOH with a concentration of 1M solution or NaOH solution for later use.

[0045] 2. Take the red copper strip as the anode, the 304 stainless steel sheet as the cathode, and the saturated mercurous chloride electrode as the reference electrode. The distance between the anode and the cathode is about 3cm. 1M KOH solution or NaOH solution is the electrolyte. Inert gas (high purity N 2 or Ar 2 etc.) about 30 min in addition to O 2 , and then controlled a constant current density of 2.5 mA / cm 2 , the anodic oxidation time is 20min, and blue Cu(OH) is formed on the surface of the copper strip 2 The film was washed 3 times with distilled water and dried for later use.

[0046] 3. Generate blue Cu(OH) on the surface 2 The copper str...

Embodiment 3

[0053] 1. Soak a 1.5×1.5 cm copper strip in 2M hydrochloric acid solution for 4 minutes to remove oxides on the copper surface, then wash it with distilled water for 5 times, then wash it with ethanol for 3 times, and dry it for later use; configure the concentration of 0.1M KOH solution or NaOH solution is ready for use.

[0054] 2. Take the red copper strip as the anode, the 304 stainless steel sheet as the cathode, the saturated mercurous chloride electrode as the reference electrode, the distance between the anode and the cathode is about 3cm, and 0.1M KOH solution or NaOH solution as the electrolyte. Inert gas (high purity N 2 or Ar 2 etc.) about 30 min in addition to O 2 , and then controlled a constant current density of 0.5 mA / cm 2 , the anodic oxidation time is 30 min, and blue Cu(OH) is formed on the surface of the copper strip 2 The film was washed 3 times with distilled water and dried for later use.

[0055] 3. Generate blue Cu(OH) on the surface 2 The cop...

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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...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/70B82Y40/00
CPCB82Y40/00H01M4/044H01M4/0471H01M4/661H01M4/70H01M10/0525Y02E60/10
Inventor 陈欣王瑛赵成龙宋春华
Owner 山东玉皇盛世化工股份有限公司
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