Colloid lead-acid storage battery cathode lead plaster for electric power assisted vehicle and preparation method

The invention relates to a colloid lead-acid storage battery cathode lead plaster for an electric power assisted vehicle and a preparation method, aiming to improve the 2hr capacity and the low-temperature capacity at -15 DEG C of a storage battery and prolong the service life. Raw materials of the lead plaster contain the following substances in parts by weight: 100 parts of lead powder, 0.03-0.06 part of fiber, 0.1-0.5 part of acetylene carbon black, 1.0-1.3 part of barium sulfate, 0.1-0.2 part of sodium lignosulphonate, 0.1-0.3 part of humic acid and 0.1-0.3 part of polyethylene glycol. Proved by repeated research trials, the lead plaster integrates the characteristics of strong low-temperature capacity of the sodium lignosulphonate and strong charge receptivity of the humic acid; meanwhile, the use of a colloid electrolyte is considered, and the polyethylene glycol is added to the lead plaster raw materials; through tests, the optimal proportions of all raw material components aredetermined so as to form a novel cathode mixed organic expanding agent, thereby the 2hr capacity, the low-temperature capacity at -15 DEG C, the cycle life, the charge receptivity and the water retention capacity of the storage battery are guaranteed, and the problem of low-temperature property attenuation of the sodium lignosulphonate is solved.