The ability to rapidly accumulate and provide energy makes ultracapacitors unique in high power and regenerative braking applications. Additionally, ultracapacitors are extremely efficient energy storage devices with 80-95 % efficiency, even under high load conditions.
High power and normal energy densities fill the gap between standard batteries and traditional capacitors for high-power, short-duration energy storage. The basic ultracapacitor technology, which is scalable in the cell form, is also scalable in module form, and ultracapacitor modules are now being configured for high-voltage, high-power applications. The flexibility and scalable nature of ultracapacitor technology enables a wide range of applications that directly interface with power-conversion systems, including DC-to-DC boost converters and DC-to-AC inverters.
Safety in Operation
Compared to lithium and lead based high power battery chemistries, ultracapacitors inherently eliminate the risk of self ignitionor explosion. As shown in nail test video, an ultracapacitor sample operated safely even after the full nail penetration. The extreme over-voltage conditions also provide no hazard risk.
Long Lifetime
Typical ultracapacitor lifetime is about 10-20 years and 500 000 – 1 000 000 charge/discharge cycles. The have a low rate of degradation in performance even after hundreds of thousands of charge/discharge cycles. An increase in the operating temperature or voltage reduces the lifetime. So it is important to keep the correct operation conditions for the ultracapacitors according to the specifications.
Wide temperature range
Ultracapacitors are typically working normally in -40C +70C temperature range. The special electrolyte can be also selected in order to extend the temperature range either below -40C or higher than +100C.
Maintenance free operation
Ultracapacitor modules are maintenance-free. For instance, once installed into an UPS system, they require no additional maintenance and have very simple monitoring.
Environmentally friendly
Ultracapacitors are environmentally-friendly because they do not contain hazardous or hard-to-recycle materials. Materials used in the ultracapacitor cells are mainly activated carbon, aluminum-based materials, polymers and some organic electrolytes.
There are more than 10 companies worldwide that possess strong technology background in ultracapacitor field. Some of them have already built their production facilities and went through the IPO.
According to the test results published recently by leading experts in the field of ultracapacitors - Dr. John R. Miller, President of JME Inc. and Dr. Andrew Burke from the Institute of Transportation Studies (UC Davis), Yunasko ultracapacitors are superior over other key competitors in terms of specific power and energy parameters.
Company
Capacitance,
F
U rated,
V
Specific
energy1,
Wh/kg
Inner
resistance2,
mΩ
RC3, s
Weight,
kg
Specific
power
(@95% eff),
kW/kg
Specific
power
(max),
kW/kg
Single cells
Yunasko
1200
2.7
4.0
0.158
0.2
0.23
5.6
50.2
BatScap
1200
2.7
4.0
0.327
0.4
0.23
2.7
24.2
LS Mtron
650
2.7
2.4
0.457
0.3
0.21
2.1
19.0
Maxwell
3000
2.7
4.5
0.229
0.7
0.51
1.8
15.6
Ioxus
3000
2.7
4.3
0.231
0.7
0.51
1.7
15.5
JM Energy
1100
3.8
10.1
2.08
2.3
0.145
1.3
12.0
Nisshinbo4
920
3
4.3
1.1
1.0
0.2
1.2
10.2
Nippon Chemicon
1100
2.5
2.8
0.883
1.0
0.28
0.7
6.3
Modules
Yunasko
200
16
2.1
2.1
0.2
2.6
1.3
11.7
Nisshinbo
160
16
1.7
10.8
0.8
2.55
0.3
2.3
Note:
Calculated based on rated capacitance and voltage window between rated V and half-rated V with JM Energy measured over full voltage window;
Measured via current-interrupt method (5 second delay, Maxwell Technology method);
Product of DC resistance and capacitance value;
Approximated data.
Comparison based on: JME test results Yunasko test results
Highest Power Density
Yunasko ultracapacitors demonstrate the highest power density among the best ultracapacitor companies in the world. It allows to build solutions that are smaller in size and cheaper in price since less single cells can be used in a module. Also, solutions can be designed for the maximum current support (a few thousand of Amperes).
Lowest ESR/EDR
One of the main advantages of YUNASKO ultracapacitors is their lowest Equivalent Series Resistance (ESR) and also Equivalent Distributed Resistance (EDR). Low ESR/EDR is the extremely important parameter in electrical circuits utilizing the stored energy because, under load, the voltage drop and power losses caused by internal resistance can be reduced to minimum values. In practical terms, more energy is readily available for consumption by electronic devices. Low ESR/EDR also implies low heat generation over the power source operation.
Lower dC/dI
YUNASKO ultracapacitors demonstrate the lowest reduction of capacitance with the current increase than any other ultracapacitors on the market. This means that under high load conditions YUNASKO ultracapacitors maintain more of their nominal charge than competing devices.
JME test results 
Yunasko test results
