Quasi-perpetual discharge behaviour in p-type Ge–air batteries

How batteries discharge: A simple model

A typical battery is a set of nominally identical voltaic cells in series and/or parallel. We consider the discharge of a single voltaic cell. As the cell discharges due to current-carrying chemical reactions, the densities of the chemical components decrease, which leads to an increase in the internal resistance of the voltaic cell and, upon discharge, a decrease in its terminal voltage and cu...

Quasi-P versus P

This report studies problems coming from three di erent domains of theoretical computer science: Clique versus Independent set in communication complexity, the Alon-SaksSeymour conjecture in graph coloring and the stubborn problem in constraint satisfaction problem. Each problem admits a quasi-polynomial size solution, meaning of size n where n is the parameter, and the problem is to nd a polyn...

Electrolyte limitation of fast discharge in lithium batteries and supercapacitors

Quasi p- or not quasi p-? That is the Question

The question might not be as profound as Shakespeare’s, but nevertheless, it is interesting. Because few people seem to be aware of quasi p-groups, we will begin with a bit of history and a definition; and then we will determine for each group of order less than 24 (and a few others) whether the group is a quasi p-group for some prime p or not. This paper is a prequel to [Hwd]. In [Hwd] we prov...

Initial Discharge Capacity of Manganese Cobaltite as Anode Material for Lithium Ion Batteries

Nanostructured manganese cobalt oxide spinel (MnCo2O4) are prepared by co-precipitation method and calcined at 650 and 750°C. Morphological studies show that by increasing the calcination temperature from 650 to 750°C, morphology of the particles changes from quasi-plate to polyhedral. The MnCo2O4 calcined at 650°C could deliver an initial discharge capacity of 1438 mAh g-1 under current densit...