Forklift battery battery positive additives need to meet the following conditions, first of all, additives in the acidic environment can not be dissolved, and dissolved into the electrolyte, not only in the positive plate can not play any role, may be harmful to the electrolyte or the negative plate; Secondly, additives should have strong antioxidant properties, in the battery charging, the positive plate oxidation potential is very high, a lot of materials can not withstand the high oxidation potential and decomposition and other reactions; Thirdly, additives should have to extend the life of the positive or improve the performance of a role in the battery, and the positive plate is a good choice. Decomposition and other reactions; Third, the additive should have the effect of prolonging the life of the positive electrode or improving a certain performance. At present, the commonly used additives are fiber, red Dan, 4BS, graphite and so on. Report more non-conductive additives, there are methyl cellulose, polytetra vinyl emulsion, hollow glass ball, silica gel, etc.; conductive Sun additives are barium lead acid, oxidized drink, conductive polymers, SnO2, iron boride, lead glass, carbon, lead dioxide, etc.; chemically active additives such as sulfate, phosphate, winding, polyvinyl sulfonate, and salt.

Fiber is an indispensable reinforcement additive for positive pole, mainly to increase the tensile strength of the pole plate and prevent the occurrence of defects such as pole plate cracks, falling blocks, etc. The length of fiber is generally 3-5m. The length of general fiber is 3-5m, and the fineness is 3 denier (fiber unit, 900m long and 1 denier heavy). Currently commonly used fiber material is polyester fiber or polypropylene fiber. In terms of use, the main requirements of the dispersion of the fiber to be good, generally added directly to the lead powder, paste can be well dispersed. The length of the fiber is too short, increase the strength of the role of reducing; length is too long, easy to hang steel wire when coating the board, resulting in coating difficulties.

Red Dan (PB2O, = 2PDO・PO2) is mainly used to improve the formation efficiency of the plate, shorten the formation time, and improve the initial capacity of the plate. It is mostly used in tube-type pole plate or thicker coating paste type pole plate. The amount of addition varies according to the situation, the less is only a few percent, the more can be added more than 20%. For thin plates, the addition of reddan will easily cause loosening of the plate, which will have a negative effect on the life, so it is used with caution in thin plates.

4BS (4PO・PHSO,) added to the positive plate, mainly play a role in crystallization of the crystal seed, so that the material in the plate to form more 4BS crystals, generally need to be used in conjunction with high temperature curing. The addition of 4BS crystal seed when compounding can make the high-temperature curing of the raw electrode plate generate smaller particles, more 4BS, and more uniform, and under high-temperature curing has the effect of preventing the growth of 4BS grains, preventing the generation of large particles in the raw electrode plate. The SEM of the cooked plates showed that the particles in the cooked plates were larger than those in the plates cured at room temperature without the addition of 4BS. The life time of the plates cured at high temperature with 4BS was significantly extended. Generally, the amount of 4BS added to the plates is 0.5%~1%. In other additives used at the same time, may affect the crystallization of 4BS, or simply can not form crystals, such as the presence of some organic matter, so add 4BS to pay attention to the impact of other additives, if necessary, need to be tested to determine. 4BS additives sold on the market, the effective content of 4BS is the key indicator, because it is still difficult to measure.