Gel battery technology

The raw material of colloidal battery is a white, amorphous, non-toxic and non-polluting inorganic nano-powder material obtained by high-temperature hydrolysis and polycondensation of halosilane in a hydrogen-oxygen flame. It has small particle size, large specific surface area and high surface activity. and high purity. Nano-silicon fibers mainly use their excellent thickening and thixotropic properties in colloidal batteries. Its thickening and thixotropic mechanism is due to the fact that the nano-silicon fibers have many silyl hydroxyl groups (Si-OH) on the surface, and the silanol groups and the oxygen in the silica combine with hydrogen to form a three-dimensional structure aggregate, which increases the viscosity of the medium, and there is an external force (shearing). shear force, electric field force, etc.), the three-dimensional structure is destroyed, the medium becomes thinner, and once the external force disappears, the three-dimensional structure will slowly recover, that is, this thixotropy is reversible. Figure 1 is a schematic diagram of the thickening and thixotropy of nano-silicon fibers. When the battery is charged, due to the increase in the concentration of sulfuric acid in the electrolyte, it is "thickened" and accompanied by cracks. The "electrolyzed water" reaction in the later stage of charging causes the oxygen generated by the positive electrode to be absorbed by the negative electrode through the countless cracks, and further It is reduced to water to realize the battery sealing cycle reaction. During discharge, the concentration of sulfuric acid in the electrolyte decreases to make it "thinned", but because the silanols on the surface of the nano-silicon fibers are extremely active, the hydroxyl groups on the surface of the particles are easily dehydrated during the charging and discharging process of the battery, and the internal structure network is particularly unstable. During the charge-discharge cycle, these particles aggregate into clusters and dry and crack, and cannot form a balanced, stable and reversible hydroxyl bond network. Therefore, some special additives such as solid stabilizers need to be added.
The main component of the colloidal electrolyte is a functional compound with a particle size close to the nanoscale, with good rheology, and it is easy to carry out the liquid dispensing and filling of the lead storage battery. After the colloidal electrolyte enters the battery or charges a few elbows, it will gradually gel, and the liquid electrolyte will be transformed into a gel. Moreover, it is helpful to prevent the sulfation of the electrode plate after filling the battery, reduce the corrosion to the grid, and improve the reaction utilization rate of the electrode plate active material.