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How To Ensure The Longest Life Of Supercapacitors
Aug 16, 2018

Operating Temperature: Supercapacitors do not generate or provide electricity or energy through electrochemical reactions. Simply put, it is achieved by static electricity. Obviously, the electrochemical reactions in supercapacitors are not only non-existent, they are also not required. An increase in temperature catalyzes a chemical reaction and accelerates the reaction rate. The same applies to supercapacitors because supercapacitors are also chemical systems. So if you want to break the life of a supercapacitor and let it work beyond the rated operating temperature range, it will definitely attenuate its capacitance, increase its resistance at an unexpected rate, and seriously reduce it. effectiveness. The magnitude of this damage effect is proportional to the overtemperature range and the overtemperature duration.

Operating voltage: Electrochemical systems generally have a stable operating voltage range beyond which the system becomes unstable from an electrochemical point of view. As with over-temperature, the consequences of over-voltage include accelerated acceleration of the capacitor and accelerated acceleration of the resistor. Overpressure also increases the rate of gas production in the monomer. If the overpressure condition is severe, the gas will increase to a certain extent, causing the internal pressure of the monomer to be too large and rupture, and then immediately fail. Unlike other electrochemical energy storage technologies, supercapacitors have no undervoltage limitations. In fact, although the reverse voltage should not be applied, as long as the reverse voltage does not exceed the absolute value of the normal operating voltage rating, it will not damage the supercapacitor or cause danger. As with temperature, the effect of overvoltage depends on the magnitude of the overvoltage and the duration of the overvoltage.

Overpressure and high temperature: The worst case is when overpressure and overtemperature occur simultaneously. In this case, both the electrochemical reaction and the gas generation are accelerated, resulting in an accelerated decrease in the capacitance, an increase in the resistance, an increase in the gas pressure in the monomer, and an irreversible degradation of the active material including the electrode active material and the electrolyte in the monomer. . It is easy to terminate the life of supercapacitors by allowing the cells to work under the harsh conditions of over-voltage and over-temperature.

Mechanical Abuse: Allowing supercapacitors to operate outside of mechanical parameters (such as vibration standards or shock criteria), except for the most rugged construction, is not immune. Sometimes it will fail immediately. Because Maxwell's supercapacitors feature unique high-strength dry electrodes and a specially designed monolithic structure, they have unique advantages over competitors in this regard. However, all products have limits that exceed the specifications specified by the manufacturer and cause the device to fail quickly.

Supercapacitors are not easy to break unless they work under over-specified conditions. It is important to understand why the manufacturer sets the working specifications for the device and what evidence and data is available to prove that the particular device is competent for its job. Specifications are set by the manufacturer and sometimes require specific interpretation. My advice is to consult and request data to get the device working within the set specifications. As long as you do this, even if you use supercapacitors in the most demanding applications, you can be satisfied.