Bismuth metal organic framework material, preparation method and positive electrode additive for lead storage battery

Abstract

The invention discloses a bismuth metal organic framework material, a preparation method of the bismuth metal organic framework material and the application of the bismuth metal organic framework material in the positive electrode additive of lead storage battery. The bismuth metal organic framework material of the present invention is a porous material with high Porosity, large pore volume, large surface area, good water solubility and acid stability, can be pre-dispersed in deionized water. The invention is suitable as the positive electrode doping material of the lead storage battery, which can improve the utilization rate of the active material and improve the charging acceptance capacity.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a bismuth metal organic framework material, a preparation method and its application in the positive electrode additive of lead storage battery. Background technique [0002] Despite the rapid development of new batteries such as lithium-ion batteries, nickel-metal hydride batteries and flow batteries, lead-acid batteries are still very reliable and safe secondary chemical power sources, and they are also the most successful and widely used power and energy storage in the market. system. Compared with other battery technologies, lead-acid batteries are safe to use, stable in operation, low in cost and long in cycle life. The theoretical capacity density of lead-acid batteries reaches 167Wh / kg, but the energy density actually used is relatively low, generally no more than 50Wh / kg, that is, the utilization rate of positive active materials is about 30%[M...

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Problems solved by technology

The theoretical capacity density of lead-acid batteries reaches 167Wh / kg, but the energy density actually used is relatively low, generally no more than 50Wh / kg, that is, the utilization rate of positive active materials is about 30%[MoseleyP.JournalofPowerSources , 1997,64(1):47-50]

With the positive discharge reaction (PbO 2 +4H + +SO 4 2- +2e - ?PbSO 4 +H 2 O) carried out, the sulfuric acid electrolyte concentration gradually decreased; in addition, PbSO 4 The generation of sulfuric acid electrolyte restricts the diffusion to the inside of the plate, resulting in low utilization of the entire active material [McGregorK.JournalofPowerSources,1996,59(1):31-43]