112
6 Nanomaterials for Batteries
operation and maintenance. It can be installed in the host room, which is suitable for
the unmanned hand guard machine room (Liu et al. 2015).
The number of valves regulated lead-acid batteries in automobiles, telecommunications, emergency services, and other applications has been increasing, causing
great concern. In order to meet the performance requirements of countless applications, a deep understanding of the attribute design of valve-regulated lead-acid
batteries is essential. The separator in the form of an absorbent glass mat is a key
component of valve-regulated lead-acid batteries. Absorptive glass mat is a versatile
material that not only separates the electrodes, but also retains sulfuric acid through
wetting and wicking properties. These characteristics are mainly achieved by using
glass fiber as a constituent material and by the structure of an absorbent glass mat.
The contact angle between glass fiber and acid is zero, which has the added advantage
of durability to the acid environment. In addition, the structure–property relationship of the absorbent glass mat depends on the porosity, uniformity, fiber size, and
fiber orientation. The synergistic effect of the structural parameters of the fiber and
the absorbent glass mat affects the saturation of the acid (the proportion of pore
volume filled with acid). This is because the fiber diameter affects the size of the
pores and the distribution of the electrolyte depends on the porous structure of the
absorbent glass mat. Fill the smaller holes and then the larger holes because the
contact area with glass fibers is the largest and the contact area with the gas phase
is the smallest. However, changes in saturation have a significant impact on both
discharge performance and recharge characteristics. For example, batteries cannot
be effectively charged below a critical saturation level. Qualitatively, it is proposed
that when the structure of the absorbent glass mat is anisotropic and has a minimum
degree of tortuosity and should have a low bulk density, a high performance of the
battery can be obtained. However, a detailed analytical model for the wicking properties of absorbent glass fiber mats is yet to be developed, which combines actual fiber
and structural parameters. Although, Kamenev and others. The height and capillary
rate of the electrolyte in the absorbent glass mat have been predicted, but the actual
structural parameters, namely fiber orientation and bulk density, were not considered
in the study.
6.1.4 Safety and Elimination Mechanism of Sealed
Lead-Acid Batteries
Valve-controlled sealed lead-acid battery, if the gas compound performance is not
good or the efficiency of the sealing reaction is low, it will lead to increased battery
electrolyte loss, a sharp decrease in battery capacity, and a drastic reduction in battery
cycle life, electrolyte drying up, and battery life termination. There are many harmful
impurities in the practical application that reduce the hydrogen overpotential of the
negative plate. Once these harmful impurities reach the negative plate, they will
reduce the hydrogen overpotential to release hydrogen, and some additional reactions
6 Nanomaterials for Batteries
operation and maintenance. It can be installed in the host room, which is suitable for
the unmanned hand guard machine room (Liu et al. 2015).
The number of valves regulated lead-acid batteries in automobiles, telecommunications, emergency services, and other applications has been increasing, causing
great concern. In order to meet the performance requirements of countless applications, a deep understanding of the attribute design of valve-regulated lead-acid
batteries is essential. The separator in the form of an absorbent glass mat is a key
component of valve-regulated lead-acid batteries. Absorptive glass mat is a versatile
material that not only separates the electrodes, but also retains sulfuric acid through
wetting and wicking properties. These characteristics are mainly achieved by using
glass fiber as a constituent material and by the structure of an absorbent glass mat.
The contact angle between glass fiber and acid is zero, which has the added advantage
of durability to the acid environment. In addition, the structure–property relationship of the absorbent glass mat depends on the porosity, uniformity, fiber size, and
fiber orientation. The synergistic effect of the structural parameters of the fiber and
the absorbent glass mat affects the saturation of the acid (the proportion of pore
volume filled with acid). This is because the fiber diameter affects the size of the
pores and the distribution of the electrolyte depends on the porous structure of the
absorbent glass mat. Fill the smaller holes and then the larger holes because the
contact area with glass fibers is the largest and the contact area with the gas phase
is the smallest. However, changes in saturation have a significant impact on both
discharge performance and recharge characteristics. For example, batteries cannot
be effectively charged below a critical saturation level. Qualitatively, it is proposed
that when the structure of the absorbent glass mat is anisotropic and has a minimum
degree of tortuosity and should have a low bulk density, a high performance of the
battery can be obtained. However, a detailed analytical model for the wicking properties of absorbent glass fiber mats is yet to be developed, which combines actual fiber
and structural parameters. Although, Kamenev and others. The height and capillary
rate of the electrolyte in the absorbent glass mat have been predicted, but the actual
structural parameters, namely fiber orientation and bulk density, were not considered
in the study.
6.1.4 Safety and Elimination Mechanism of Sealed
Lead-Acid Batteries
Valve-controlled sealed lead-acid battery, if the gas compound performance is not
good or the efficiency of the sealing reaction is low, it will lead to increased battery
electrolyte loss, a sharp decrease in battery capacity, and a drastic reduction in battery
cycle life, electrolyte drying up, and battery life termination. There are many harmful
impurities in the practical application that reduce the hydrogen overpotential of the
negative plate. Once these harmful impurities reach the negative plate, they will
reduce the hydrogen overpotential to release hydrogen, and some additional reactions