180 Ah kg specific capacity positive tubular electrodes for lead acid batteries

Two disadvantages of lead acid batteries are poor power and energy densities and the necessity of relatively long recharging times. In this paper it is presented the results of ongoing work aimed at increasing both the positive active material (PAM) specific capacity and the positive plate charge acceptability.The experimental results show that adequate curing processes can be used to develop an interconnected structure among nanometric PbO₂ particles to produce tubular electrodes with specific capacity higher than 180 Ah kg⁻¹ and maintain this value for 130 cycles with deep discharges.These PbO₂ positive plates are expected to exhibit higher charge acceptability due to their larger PAM surface area as compared to conventional ones, but the results indicate that the high internal ohmic resistance of the grid/PAM zone limits the fast charge efficiency.