
270 Electrochemically Enabled Sustainability
conductive powders. The specic energy of Ni–MH batteries can vary from
40 to 110 Wh/kg depending on the application. For example, where device
runtime is paramount, Ni–MH batteries would not need high-power capa-
bility. On the other hand, for extremely high power charge and discharge
requirements, factors that affect the specic energy of Ni–MH batteries are
(a) extra current collection, (b) high N/P ratios (proportion of excess negative
electrode capacity to positive electrode capacity) and (c) specic cell design
and construction.
The specic energy of Ni–MH batteries is kept between 90 and 110 ...