JM Energy Corporation

What is a lithium ion capacitor (LIC)?

Lithium ion capacitor (LIC) is a lithium secondary battery that uses the principle of a general electrical double layer capacitor and uses a carbonaceous material capable of occluding lithium ion as a negative electrode material, and adds lithium ions to it to improve energy density It is a capacitor. The principle of charge and discharge is different between the positive electrode and the negative electrode, and it has a structure combining the negative electrode of the lithium ion secondary battery and the positive electrode of the electric double layer. It is a kind of asymmetric capacitor whose principle of the positive electrode differs from the principle of the negative electrode and has a structure combining the positive electrode of the electric double layer capacitor and the negative electrode of the lithium ion secondary battery and the positive electrode forms an electric double layer and is filled with physical action While discharging, the negative electrode is charged and discharged by the redox reaction of lithium. The reason why the energy density is higher than that of conventional capacitors is largely due to the fact that the electrostatic capacity of the negative electrode is increased by pre-doping to this negative electrode.

Comparison with various electric storage devices

  • Configuration and characteristics of various electric storage devices

    Lithium ion capacitor (LIC) is a new electric storage device that combines high power density and high energy density. Compared to similar electricity storage devices, electrical double layer capacitor (EDLC) and lithium ion battery (LIB), we introduce its characteristics.

  • Storage principle and features of LIC

  • Storage principle and features of electrical double layer capacitors

  • Storage principle and features of lithium-ion batteries

  • Comparison of characteristics of various electric storage devices

    Lithium Ion Capacitor Electrical Double Layer Capacitor Lithium Ion Battery Lead Acid Battery
    Energy density Medium
    (Higher at high current)
    Low Very high High
    Power density High High Low
    (not good for rapid charge)
    Very low
    Rapid charge/discharge in seconds in seconds in hours
    (Needs a charge control)
    in hours
    (Needs a refreshing charge)
    Internal resistance Low Low High Very high
    Low temperature performance Good Good Very bad Bad
    High temperature performance Very good
    (up to 70℃)
    Good
    (up to 60℃)
    Very bad
    (up to 40℃)
    Very bad
    Self discharge Small Big Small Big
    Maintenance Maintenance free Maintenance free Frequent replace required Frequent replace required
    Lifetime
    (float / cycling)
    Long Long Relatively short Short
    (sudden death occurs)
    Safety and flammability High, flammable High, flammable Low, flammable (Self heat up / igniting) High, not flammable
    Application Very high power
    (Medium energy)
    Very high power
    (Lower energy)
    Medium power
    (High energy)
    Low power
    (High energy)
  • Market needs and characteristics of various electric storage devices

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