Method for preparing battery electrode by directly growing carbon nanotubes on foamed nickel substrate

Abstract

The invention provides a method for preparing a battery electrode by directly growing carbon nanotubes on a foamed nickel substrate. The method comprises the following steps of selecting foamed nickel as a catalytic and base material of a chemical vapor deposition reaction of carbon nanotubes, and performing chemical and ultrasonic cleaning on the foamed nickel substrate; setting a CVD reaction apparatus, performing direct chemical vapor deposition growth of the carbon nanotubes on the foamed nickel substrate in the CVD reaction apparatus, wherein when the growth temperature is 600-900 DEG C, the flow ratio of a hydrocarbon gas to a carrier gas is (10-40scmm) to (100-400sccm), the growth pressure is 1-760Torr, and the growth time is 1-30min. The method has the advantages as follows: a remarkable effect is played on improvement of performance of a battery device; the specific surface area and electrochemical activity of the CNT-foamed nickel substrate are greatly improved; and the cycle life of a nickel-metal hydride battery based on the CNT-foamed nickel substrate is highly prolonged.

Description

technical field [0001] The invention belongs to the application field of carbon nanotubes, and specifically refers to a method for directly growing carbon nanotubes on a foamed nickel substrate to prepare foamed nickel battery electrodes. Background technique [0002] Nickel foam has excellent catalytic activity, porous structure, and large surface area. In various battery energy devices such as nickel-metal hydride batteries and supercapacitors, nickel foam is an important material for preparing battery electrodes. Improving the catalytic activity, porosity, and conductivity of nickel foam is of great significance for enhancing the performance of battery devices. Carbon nanotubes (CNTs) have typical layered hollow structure characteristics, high aspect ratio, high mechanical strength, and stable chemical properties, making their application in the field of battery energy devices widely concerned and studied. Therefore, combining CNTs with nickel foam is an effective way to...

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Problems solved by technology

Constrained by the growth mechanism of CNTs, this method has some inherent defects, including: (1) In terms of structural properties, it is difficult to form a strong organic bond between CNTs-catalyzed metal film-substrate. Under the impact of different application conditions, The CNT film is easy to fall off, which directly affects the performance and life of the device; (2) The conductivity of the CNT-catalytic metal film-substrate structure is not good, which affects the performance of electronics, energy and other devices; (3) CNT-catalytic metal film-substrate structure The non-tight combination will cause large heat dissipation, which will not only directly affect the efficiency and other characteristics of energy devices, but also accelerate the aging of devices.

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