Battery positive electrode material, its preparation method and battery

Abstract

The invention provides a battery cathode material. The battery cathode material comprises sulfur particles, a conductive additive and graphene, wherein the sulfur particles are loaded on the surface of the conductive additive; the conductive additive and the sulfur particles are wrapped into the graphene; and the conductive additive comprises the following constituents based on weight: 1-10 parts of Pb3O4 and 25-50 parts of Beta-PbO2. By the battery cathode material, the content of lead dioxide is increased, the polar plate formation difficulty is reduced, and the capacity of a polar plate is improved; with the addition of the Beta-PbO2, the capacity of a battery can be improved, and meanwhile, the charging and discharging voltage of the battery is increased slightly; and by adjusting the proportion of the Pb3O4 and Beta-PbO2, the strength of the polar plate, the charging and discharging voltage at an early stage, the charging and discharging voltage at a post stage, the cyclic post-stage capacity and the like are improved to an ideal level.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery cathode material, a preparation method thereof and a battery. Background technique [0002] Today, with the rapid development of technology, with the continuous development of electric vehicles, electronic products, and household appliances, the batteries that can be used are also constantly updated, and the battery's power storage capacity and battery life have also reached a new requirement. [0003] Ni-Cd rechargeable batteries were invented earlier, but due to the problems of low weight density and serious environmental pollution, civilian products are no longer used. The capacity density and energy density of lithium-ion batteries are large, and the cruising distance after one charge is long. However, due to the unsatisfactory high-current performance of lithium-ion batteries, the unsatisfactory starting, acceleration and climbing capabilities, and the high price...

AI Technical Summary

Problems solved by technology

[0003] Ni-Cd rechargeable batteries were invented earlier, but due to the problems of low weight density and serious environmental pollution, civilian products are no longer used

Lithium-ion batteries have high capacity density and energy density, and a long range after one charge. However, due to the unsatisfactory high-current performance of lithium-ion batteries, unsatisfactory starting, acceleration and climbing capabilities, and high prices, market applications have been restricted. Obvious restrictions

[0004] For lead-acid batteries, although their cycle performance is limited, they are cheap and have good high-current discharge performance, but for now, lead-acid batteries have low energy density, and the content of lead dioxide in the positive plate is up to 85%. In fact, in general production, it can only be controlled at about 80%.

This means that 20% of the active substances have not been utilized, resulting in low cycle capacity and short life of the battery for the first time.

If the conversion rate of lead dioxide is simply increased in the production process of the plate, first, a relatively large proportion of electric energy is required, which is not economically cost-effective; moreover, the strength of the active material of the positive plate will be greatly affected, which is extremely Decreased board strength

Therefore, there is an urgent need to develop a method that can improve the energy density and low cycle capacity of lead-acid batteries.