What is a Lithium-ion capacitor?｜Lithium-ion capacitor｜JTEKT CORPORATION

＞ Inquiries regarding products 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 EDLC Lithium-ion Capacitor(Conventional)

Energy ◎ △ ◯

Power density △ ◯ ◯

Service life(number ofcharges/discharges) △ ◯ ◯

Operatingtemperature range (℃) -20～60 -40～70 -30～70

Operating voltage (V) ～4.3 0～2.7 2.2～3.8

Lithium-ion Capacitor(Libuddy)

◯

〇⇒◎（Improved byincreasing heat-resistance）

〇⇒◎（Improved byincreasing heat-resistance）

-40～85

2.2～3.8

Libuddy has significantly improved power density and service life due to the wide operating temperature range.

＞ 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.This achieves higher energy density than general capacitors and higher safety than general Lithium-ion secondary batteries.

Lithium-ion Battery EDLC Lithium-ion Capacitor(Conventional)

Internal structure Click to enlarge Click to enlarge Click to enlarge

Charge / discharge　mechanism +：Lithium chemical reaction-：Lithium insertion / removal脱 +：Electrolyte ion adsorption / desorption-：Electrolyte ion adsorption / desorption +：Electrolyte ion adsorption / desorption-：Lithium insertion / removal

Features Energy (Wh/L) 200～400 3～6 10～20

Power density (W/kg) 500～2,000 1,000～4,500 1,000～3,500

Cycle life (cyc.) 1,000～3,000 Over 100,000 Over 100,000

Operating temperature limit (℃) -20～60 -30～70 -30～60

Lithium-ion Capacitor(Libuddy)

Click to enlarge

+：Electrolyte ion adsorption / desorption-：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) The number of electrons flowing per second

Voltage (V) The difference in potential between two points

Watt (W) Amount of electrical energy that can be output per second

Watt-hour (Wh) Total electrical energy

Internal resistance (mΩ) Resistance of energy storage devices

C-rate (C) A value that represents the ease of outputting power

Joule

heat (J) Heat generated when a current flows through a conductor

Primary battery Batteries that can only be discharged (cannot be charged)

Secondary battery Rechargeable batteries (can be used repeatedly)

Float charging How to charge at a constant voltage

Power density (W/L, W/kg) Power by unit volume or mass

Energy density (Wh/L, Wh/kg) Electric energy by unit volume or mass

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Materials about JTEKT's Capacitor