A conjugated tetracarboxylate anode for stable and sustainable Na-ion batteries

A conjugated tetracarboxylate, Na₄C₁₀H₂O₈, shows low redox potentials (∼0.65 V), long cycle life (1000 cycles), and fast charging capability (up to 2 A g⁻¹), demonstrating a promising organic anode for stable and sustainable Na-ion batteries.