Comparison of Heat‐Fin Materials and Design of a Common‐Pressure‐Vessel Nickel‐Hydrogen Battery

Abstract

The reversibility of the octanoate adsorption was assessed by stepping the potential from -1 to +1 V vs. SHE (positive sweep), and then back from +1 to -1 V (negative sweep), and measuring friction and inverse capacitance for a 0.1 w/o 'solution of octanoic acid (Fig. 8). Friction and capacitance displayed hysteresis between the sweeps, though both returned to a value near the original at the end of the negative sweep, indicating desorption of the octanoate film. ConclusionStatic friction, current, capacitance, and radiotracer measurements have all shown the potential-dependent nature of lubricant-film formation in aqueous solutions of octanoic acid neutralized with sodium hydroxide. In a solution of 1 w/o octanoic acid, the static coefficient of friction between mild steel and iron was reduced by more than 50% on changing the electrode potential from -400 to 300 mV vs. SHE. This may be due to electrostatic interactions between negatively charged octanoate species and the electrode; at potentials above the pzc of iron (ca. -400 mV vs. SHE), the electrode is positively charged, enabling the adsorption of a lubricating oetanoate film. At potentials below -400 mV vs. SHE, film formation was inhibited, and friction consequently increased.

Experimental exploration of finned cooling structure for the thermal management of lithium batteries with different discharge rate and materials

“…The 3-D transient thermal analysis showed that the pin fins are in favor of decreasing the bulk temperature and improving the temperature uniformity. Kim and White [25] studied different materials such as copper, copper beryllium, silver, and sterling silver as heat-fin materials by using a 2-D thermal coupling model of NI-MH battery. The fin geometry (thickness and height) and spacing were tested and yielded an acceptable temperature gradient of the battery pack.…”