Novel Lithium-Ion Capacitor Based on a NiO-rGO Composite

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Lithium-ion capacitors (LICs) are crucial for energy storage but face challenges in balancing energy density, power density, and cycle life.
• Developing advanced electrode materials is key to overcoming these limitations in LIC performance.

Purpose of the Study:

• To fabricate and characterize a novel LIC device utilizing a composite negative electrode and a commercial positive electrode.
• To evaluate the electrochemical performance, including energy density, power density, and cycle stability, of the developed LIC system.

Main Methods:

• Fabrication of a NiO-reduced graphene oxide (NiO-rGO) composite for the negative electrode.
• Utilization of commercial activated carbon (AC) as the positive electrode material.
• Electrochemical testing of the NiO-rGO//AC LIC system at various current densities and cycles.

Main Results:

• The NiO-rGO//AC system demonstrated a high specific capacity of 945.8 mA h g⁻¹ at 0.5 A g⁻¹.
• The LIC achieved a high energy density of 98.15 W h kg⁻¹ and a high power density of 10.94 kW kg⁻¹.
• The device exhibited excellent cycle stability, retaining 72.1% of its capacity after 10,000 cycles.

Conclusions:

• The novel NiO-rGO//AC LIC system offers a promising solution for advanced energy storage applications.
• This configuration effectively balances high energy density, high power density, and long cycle life.
• The study presents a new manufacturing option for high-performance LIC devices.