This was on TB's site the other day. I promised to respond, but it wont fit.

“The EEStor Capacitor advantage”

“EEStor Capacitors are solid designs with no Electrolytes and have long term storage”

It is not known if the EEStor product can be stored in humid atmospheres or high temperatures. Furthermore, 95% of other capacitors do NOT have liquid electrolytes. They are trying to color the rest of the capacitor industry with the reputation of cheap aluminums a few years ago from Asia that leaked all over computer mother boards.

EEStor will never compete with inexpensive aluminum high cap electrolytics, nor would they want to.…

“EEStor Capacitors have lower ripple current than the competition” …sounds like another BKK-ism. That’s a good thing for power supplies, but in passives, it usually means that they can’t stand as much ripple current as others.

“Competing capacitors have toxic liquid Electrolytes and shorter shelf life” No, the parts that EEStor’s polymer capacitors will compete with are all solid state. 3M, DuPont, Sanmina, and others all make an identical product, which are uses as buried layers in circuit boards. The rest of the competition for the capacitance/lvoltage level they make will “compete” with solid ceramic capacitors, and maybe solid state electrolytics.

 
“Competing capacitors have excess ripple current and shorter shelf life”.  This makes no sense; Capacitors don’t make ripple currents, they pass them, and the higher the value, the better.

“EEStor Capacitors have rapid charge and discharge capabilities” Tiny capacitors all charge quickly. When it comes to larger values, we will see.

“EEStor Capacitors Have lower ESR than the competitions” No, some of the MLC have such low ESR’s that resistance has to be added.  (I have a patent on that, its quite a problem). Too low an ESR can cause unwanted resonance.

“Competing capacitors have slower charge and discharge times” That’s silly, it depends on the capacitor and the circuit its in.

“Competing capacitors have higher ESR” Not necessarily, depends on type and use.

“EEStor Capacitors have Ultra high shock resistance capabilities” I don’t believe this has been tested yet on standard shock tests. A lot of that depends on the packaging.

“EEStor Capacitors can operate effectively in harsh environments” This has not been tested yet, lets see what happens in high temp, rated voltage official tests. Also, there is 85% RH at 85 deg C. There is salt spray, and thermal shock. Thermal cycling can be a killer.

“Competing capacitors can be easily damaged from mechanical shock” No, it depends on the type. I have made parts that go into bullets, that’s a shock!

“Competing capacitors have difficulties in harsh environments”.  Other parts are in oil wells, deep space, on hot engines, in ocean water and worse. I once made a part that had to function in liquid nitrogen.

“EEStor Capacitors have Capacitance stability with increasing temperature”. Not like an NPO ceramic. With MLC one can choose what degree of stability, which can be a tradeoff for higher capacitance.

“Competing capacitors have capacitance Roll Off with temperature”.  Not all. Again, some types are more stable than EEStor, at the same K level

“EEStor Capacitors have Low Costs to produce because of their Ceramic Dielectric” That’s a joke, right?  Real capacitors are produced in the hundred millions per day, at costs less than a cent. Look at the EEStor video, and see if its that cheap a process.

“Competing capacitors based upon voltage and capacitance have higher costs to produce” No, see above.

“Competing capacitors that have high capacitance and high voltage are wet Electrolyte solutions with notable limitations” No, as stated above, there are few electrolytics with liquid electrolytes, and they are now more reliable with hermetic seals. There are also electrolytics with solid polymer electrolytes, and high voltage ceramics.