Preparation method of carbon-coated hydrogen storage alloy

• Main Authors: YUAN HUIPING, LI ZHINIAN, JIANG LIJUN, WU RAN, JIANG WENQUAN, HAO LEI
• Format: Patent
• Language: Chinese; English
• Published: 22.10.2021
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CASTING; CHEMISTRY; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; METALLURGY; NANOTECHNOLOGY; PERFORMING OPERATIONS; POWDER METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WORKING METALLIC POWDER

The invention discloses a preparation method of a carbon-coated hydrogen storage alloy, which comprises the following steps: dissolving a carbon source by using a solvent, uniformly mixing with the hydrogen storage alloy, sintering the mixture in a vacuum or argon atmosphere, heating to 200 DEG C at a rate of 3-5 DEG C/min in the sintering heating process, then heating to 350-500 DEG C at a rate of 0.2-1 DEG C/min, keeping the temperature for 2-5 hours, and then cooling along with a furnace. The carbon content in the prepared carbon-coated hydrogen storage alloy is 0.1-1.0 wt.%. According to the method, the influence of harmful gas on the electrochemical performance of the hydrogen storage alloy in the sintering process can be reduced, an amorphous nanocarbon coating layer which is uniformly distributed and has good electrocatalytic activity is formed on the surface of the hydrogen storage alloy, the rate discharge characteristic and the cycling stability of a hydrogen storage alloy electrode are effectively