What is a Lithium-ion capacitor?｜Lithium-ion capacitor｜JTEKT CORPORATION
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Lithium-ion capacitor
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Lithium-ion capacitor
What is a Lithium-ion capacitor?
What is a Lithium-ion capacitor?
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What is a Lithium-ion capacitor？
Capacitors are power storage devices that are classified as secondary batteries.Various types of capacitors have been developed depending on the materials used, but there are generally two types of capacitors with large capacities: "Electric Double Layer Capacitors (EDLC)" and "Lithium-ion Capacitors".
Comparison of power density and energy density for power storage devices
＞ Click here for glossary about electricity
Features
The feature of capacitors is that electricity goes in and out (charges/discharges) very quickly.Compared to well-known power storage devices (lithium-ion secondary batteries, lead-acid batteries, etc.), the energy density is inferior, but the power density is excellent, the performance deterioration due to repeated charging and discharging is small, and the life is long.
Performance comparison table
◎Excellent、◯Good、△Average
Lithium-ion Battery<br>EDLC<br>Lithium-ion Capacitor<br>(Conventional)
Energy
Power density
Service life<br>(number of<br>charges/discharges)
Operating<br>temperature range (℃)<br>-20～60<br>-40～70<br>-30～70
Operating voltage (V)<br>～4.3<br>0～2.7<br>2.2～3.8
Lithium-ion Capacitor<br>(Libuddy)
〇⇒◎<br>（Improved by<br>increasing heat-<br>resistance）
〇⇒◎<br>（Improved by<br>increasing heat-<br>resistance）
-40～85
2.2～3.8
Libuddy has significantly improved power density and service life due to the wide operating temperature range.
What is Libuddy
Test data
＞ Click here for glossary about electricity
Principle and structure of Lithium-ion capacitors
Lithium-ion capacitor combines the positive electrode of EDLC and the negative electrode of a Lithium-ion secondary battery.<br>This achieves higher energy density than general capacitors and higher safety than general Lithium-ion secondary batteries.
Lithium-ion Battery<br>EDLC<br>Lithium-ion Capacitor<br>(Conventional)
Internal structure
Click to enlarge
Click to enlarge
Click to enlarge
Charge / discharge mechanism<br>+：Lithium chemical reaction<br>-：Lithium insertion / removal脱<br>+：Electrolyte ion adsorption / desorption<br>-：Electrolyte ion adsorption / desorption<br>+：Electrolyte ion adsorption / desorption<br>-：Lithium insertion / removal
Features<br>Energy (Wh/L)<br>200～400<br>3～6<br>10～20
Power density (W/kg)<br>500～2,000<br>1,000～4,500<br>1,000～3,500
Cycle life (cyc.)<br>1,000～3,000<br>Over 100,000<br>Over 100,000
Operating temperature limit (℃)<br>-20～60<br>-30～70<br>-30～60
Lithium-ion Capacitor<br>(Libuddy)
Click to enlarge
+：Electrolyte ion adsorption / desorption<br>-：Lithium insertion / removal
13
7,000
Over 1 million
-40～85
There are two types of capacitors, a laminated type and a can type.JTEKT uses the laminated type (shown below).
＞ Click here for glossary about electricity
Manufacturing method of Lithium-ion capacitor
Lithium-ion capacitors are manufactured in much the same process as Lithium-ion batteries.
General method for manufacturing lithium-ion capacitors
Glossary about electricity
Current (A)<br>The number of electrons flowing per second
Voltage (V)<br>The difference in potential between two points
Watt (W)<br>Amount of electrical energy that can be output per second
Watt-hour (Wh)<br>Total electrical energy
Internal resistance (mΩ)<br>Resistance of energy storage devices
C-rate (C)<br>A value that represents the ease of outputting power
Joule heat (J)<br>Heat generated when a current flows through a conductor
Primary battery<br>Batteries that can only be discharged (cannot be charged)
Secondary battery<br>Rechargeable batteries (can be used repeatedly)
Float charging<br>How to charge at a constant voltage
Power density (W/L, W/kg)<br>Power by unit volume or mass
Energy density (Wh/L, Wh/kg)<br>Electric energy by unit volume or mass
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