Composite catalyst for lead acid battery, and preparation method of composite catalyst

Abstract

The invention provides a composite catalyst for a lead acid battery, and a preparation method of the composite catalyst. Carbon particles are used as a carrier for carrying a metal catalyst; the metal catalyst is platinum and / or palladium; and the carrying amount of the metal catalyst is 0.2-1 percent of the weight of the carbon particles. The composite catalyst provided by the invention is prepared by an immersion reduction method which comprises the following steps: firstly, immersing the carbon particles into ethylene glycol, adding an ethylene glycol solution containing chloroplatinic acid and / or palladium chloride, using ethylene glycol as a reducing agent under an alkaline condition, and stirring and reacting for 2-4h at 120-140 DEG to obtain the composite catalyst. The composite catalyst provided by the invention can effectively and safely catalyze the compound reaction of hydrogen and oxygen separated out from the lead acid battery, reduce the loss of water in the electrolyte, and prolong the service life of the lead acid battery. At the same time, as the loaded catalyst with a low loading amount is adopted by the invention, on the premise of effectively catalyzing the compound reaction of hydrogen and oxygen, the composite catalyst for the lead acid battery and the preparation method have the advantages that the manufacturing cost is low, the preparation process is simple, and the implementation and the amplification are easy and convenient and the like.

Description

technical field [0001] The invention relates to a composite catalyst for a lead-acid battery and a preparation method thereof, in particular to a composite catalyst for a valve-regulated lead-acid battery (VRLA). The catalyst provided by the invention can effectively and safely catalyze the composite reaction of the precipitated hydrogen and oxygen, reduce the loss of water in the electrolytic solution, and prolong the service life of the lead-acid battery. Background technique [0002] Lead-acid batteries were invented in 1859 and have been used for more than 100 years. There have been many improvements in terms of application value, reliable power supply, cycle life, and high-rate discharge. However, there are two problems in general lead-acid batteries that are difficult to solve: one is When overcharging, the water in the electrolyte will be decomposed into hydrogen and oxygen, so the battery needs to be replenished with water frequently during use; the second is that th...

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Problems solved by technology

[0012] Valve-regulated lead-acid batteries adopt gas recombination technology, and about 95% of oxygen is recombined inside the battery through oxygen circulation. However, under conditions such as overcharging and high temperature, the decomposition rate of water in the electrolyte is accelerated, resulting in more oxygen And hydrogen, when the gas pressure reaches a certain level, the throttle valve (also known as the safety valve) will open and remove the surplus gas, reducing the internal pressure of the battery, thereby causing the loss of water in the electrolyte

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