A High Performance Lithium-Ion Capacitor with Both Electrodes Prepared from Sri Lanka Graphite Ore

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Sri Lankan vein graphite is a cost-effective anode material for lithium-ion batteries due to its high crystallinity.
• Developing advanced energy storage devices requires high-performance electrode materials.

Purpose of the Study:

• To prepare graphitic porous carbon (GPC) and high-purity vein graphite (PVG) from Sri Lankan graphite ore.
• To fabricate and evaluate a lithium-ion capacitor (LIC) using GPC and PVG as electrode materials.

Main Methods:

• KOH activation of Sri Lankan graphite ore to produce GPC.
• High-temperature purification of Sri Lankan graphite ore to yield PVG.
• Fabrication of a GPC//PVG lithium-ion capacitor.

Main Results:

• The GPC//PVG LIC exhibited a maximum energy density of 86 W·h·kg⁻¹ at 150 W·kg⁻¹.
• The device maintained an energy density of 48 W·h·kg⁻¹ at a high power density of 7.4 kW·kg⁻¹.

Conclusions:

• The developed lithium-ion capacitor demonstrates high electrochemical performance.
• The use of low-cost, readily available Sri Lankan graphite makes this LIC technology promising for practical applications.