Valve controlled lead acid cell with composite oxides additive contained in positive electrode

Abstract

The invention belongs to electrochemiscal energy technical field ,which concretely relates to a valve controlled lead acid battery whose positive electrode contains composite oxides, the composite oxides is formed by rare earth oxide with a certain chemical ratio and oxide of V group metal elements, the rare earth oxide is one of lanthanum department whose mass percentage is 3~9% in composite oxides and that of V group metal elements is 97~91%. Add the composite oxides into lead powder 1according the mass percentage of lead powder powder which is (0.03~1.0)%, then valve controlled lead acid battery can be manufactured. The accumulator has notably increased discharge capacity by adding the composite oxides in positive electrode, prolong its service life, and has important practical use in development of motor bicycle power source and extension of lead accumulator into other fields.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy, and in particular relates to a valve-regulated lead-acid storage battery with a positive electrode containing a composite oxide additive. Background technique [0002] In recent years, in order to alleviate the depletion of natural energy and the serious environmental problems caused by urban traffic, a short-range, light electric bicycle with no pollution emissions is developing rapidly in major and medium cities across the country, and even in rural areas and towns. The rate of doubling increases rapidly. Undoubtedly, the gradual replacement of heavily polluting fuel vehicles with "zero-emission" electric vehicles is not only of great practical significance for preventing environmental pollution and saving natural energy, but also is a problem that urban citizens generally care about and urgently need to be solved. [0003] Over the past few years, the experience of marketizatio...

AI Technical Summary

Problems solved by technology

[0005] (1) Reaction product PbSO 4 The poor conductivity prevents the internal active material from continuing to participate in the electrode reaction;

[0006] (2) PbSO is preferentially formed on the surface of the electrode than inside 4 Because of the increase in molar volume, the pores between the active substances are blocked, which hinders the conduction of ions in the pores;

[0007] (3) The disintegration of the gel-network structure of the active material causes the active material to soften and fall off prematurely, thereby prematurely losing the initial capacity of the battery and shortening the service life of the battery

This is mainly because the positive active material PbO 2 The strong oxidation and the high anode potential of the battery in the charged state make these carbon additives gradually oxidize and fail during the cycle of the battery, so it is still difficult to find stable substances resistant to such high anode potential oxidation, which makes Various attempts to extend battery life by finding conductive carbon additives have had little success