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Small cell technology refers to a type of wireless communication infrastructure that is designed to enhance network capacity and coverage in areas with high user density or limited space. It involves the deployment of small, low-powered cellular base stations called “small cells” to supplement the existing network. Figure 1 Small Cell Technology
In the United States, recent FCC orders have provided size and elevation guidelines to help more clearly define small cell equipment. They are "small" compared to a mobile macrocell, partly because they have a shorter range and partly because they typically handle fewer concurrent calls or sessions.
Small cells are typically compact and have a lower range compared to traditional cell towers. They are very flexible and can be installed on streetlights, utility poles, buildings, or other structures, allowing for more localized and targeted coverage.
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The history of zinc-based flow batteries is longer than that of the vanadium flow battery but has only a handful of demonstration systems. The currently available demo and application for zinc-based flow batteries are zinc-bromine flow batteries, alkaline zinc-iron flow batteries, and alkaline zinc-nickel flow batteries.
Among the above-mentioned zinc-based flow batteries, the zinc-bromine flow batteries are one of the few batteries in which the anolyte and catholyte are completely consistent. This avoids the cross-contamination of the electrolyte and makes the regeneration of electrolytes simple.
Benefiting from the uniform zinc plating and materials optimization, the areal capacity of zinc-based flow batteries has been remarkably improved, e.g., 435 mAh cm-2 for a single alkaline zinc-iron flow battery, 240 mAh cm -2 for an alkaline zinc-iron flow battery cell stack , 240 mAh cm -2 for a single zinc-iodine flow battery .
Although the corrosion of zinc metal can be alleviated by using additives to form protective layers on the surface of zinc [14, 15], it cannot resolve this issue essentially, which has challenged the practical application of zinc-based flow batteries.
