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서브비주얼

Advanced Battery Materials Lab.

Prof. Cheol-Min Park and colleagues at ABML (Advanced Battery Materials Lab. in KIT) in Korea are attempting to meet the ever increasing demands for better batteries.

Research Area

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  • Introduction >
  • Research Area

Lithium (Li)-ion battery

  • Li-ion battery

    Lithium-ion battery is a type of rechargeable battery in which a lithium ion moves between the anode and cathode. The lithium ions move from a lithiated graphite (LixC6) structure to a delithiated (Li1-xCoO2) structure during discharge and the reverse process occurs during charge. They are currently one of the most popular types of battery for portable electronics, with one of the best energy-to-weight ratios, no memory effect, and a slow loss of charge when not in use. In addition to uses for consumer electronics, lithium-ion batteries are growing in popularity for defense, automotive, and aerospace applications due to their high energy density.

  • Characteristics
    High energy density
    • High potential difference (3.5V ~ 4.2 V)
    Long cycle life
    • Over 80% remaining capacity after 500 deep discharge cycles
    • No memory effect like Ni-Cd
    Environmental friendliness
    • Environmentally friendly materials
    • No heavy metal like cadmium, mercury, etc.
  • Electrode materials for Li-ion batteries
    Characterization of representative anodes <caption class="dns">Characterization of representative anodes</caption>
    Li metal Graphite Disordered carbon Li-alloy Li4Ti5O12
    Capacity 3860 mAh g-1 372 mAh g-1 ~250 mAh g-1 >500 mAh g-1 170 mAh g-1
    Potential Low Low Low Low High
    Safety Very poor Poor Good Poor Excellent
    Application For next generation battery Mobile IT Power tool, HEV Mobile IT, EV Safe energy storage
    Characterization of representative cathodes <caption class="dns">Characterization of representative cathodes</caption>
    LiCoO2 LiNiO2 LiFePO4 LiMnO2 LiMn2O4
    Crystalline system Layered Layered Olivine Layered Spinel
    Theoretical capacity 274 mAh g-1 275 mAh g-1 170 mAh g-1 285 mAh g-1 148 mAh g-1
    Specific capacity ca. 145 mAh g-1 ca. 160 mAh g-1 ca. 150 mAh g-1 ca. 190 mAh g-1 ca. 120 mAh g-1
    Voltage
    (V, Li/Li+)
    3.9 V 3.7 V 3.45 V 2.8 V ~ 3.4 V 4.0 V