Information elements are mental processes. They are "the psychic modules that perceive, process, and produce corresponding information aspects".
Information aspects are properties of reality that exist independent from psyche. These aspects of reality are, however, defined by the fact that humans perceive and process specific types information from a given situation or thing. (This is why the description of information elements says that they produce corresponding information aspects.)
This gets into the chicken and the egg and the tree that falls in the forest with no one around to hear it, but the simplest way to look at it for the purposes of communicating effectively is that information elements refer to mental processes and information aspects are aspects of reality that are in that moment being discussed/understood separately from mental processes or and independent of a particular human's perspective.
Interestingly, information aspects can also exist independently from other information aspects, but information elements cannot work independently of each other.
For example, if there's a car driving down the road, the outward/apparent activity is Te and the state is Se. As an information aspect, the Se of the car would be it's color and whatnot. However, as an information element, there's no way to see only Te in that situation because you have to see the Se aspects at the same time in order to know that there's even a car there. (This is why I prefer to talk about information aspects... once you start talking about examples or less abstract descriptions of an information element, it's difficult if not impossible to keep it separate from other information elements.)
Examples may follow.