Regenerated Graphite-Derived Cellular-Inspired Polydopamine@NiO@Graphite toward Robust Lithium Storage.

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Transition metal anodes offer high energy density but suffer from structural instability due to volume expansion during battery cycling.
• Developing stable anodes is crucial for advancing high-performance lithium-ion batteries.

Purpose of the Study:

• To design and fabricate a novel three-dimensional (3D) structured anode that mitigates volume expansion and structural collapse in transition metal-based batteries.
• To improve the electrochemical performance, specifically specific capacity and long-cycle stability, of lithium-ion batteries.

Main Methods:

• A simulated cellular structure anode was created using uniform nickel oxide (NiO) nanoparticles wrapped in polydopamine (PDA).
• The anode was constructed on a recycled graphite conductive substrate, forming PDA@NiO@G.
• Electrochemical testing was performed to evaluate specific capacity and cycle performance.

Main Results:

• The 3D structured PDA@NiO@G anode demonstrated excellent specific capacity (500 mAh g⁻¹ at 0.1 A g⁻¹).
• Significantly improved long-cycle performance was achieved, retaining 402 mAh g⁻¹ after 500 cycles at 0.5 A g⁻¹.
• The polydopamine coating effectively protected the 3D structure from collapse and facilitated ion/electron diffusion.

Conclusions:

• The structure modulation strategy using PDA wrapping effectively addresses the volume expansion issue in transition metal anodes.
• The fabricated 3D anode exhibits high kinetics and prolonged life, offering a promising approach for next-generation lithium-ion batteries.
• This study highlights the potential for reusing spent graphite anodes in advanced battery fabrication.