In-situ carbon coating enhances the ion transport rate and cycling stability of Zn₂SnO₄ as high-performance anode for lithium-ion capacitors

However, their practical implementation has been significantly limited by rapid capacity degradation during cycling, primarily attributed to substantial volume expansion effects. In this study, we developed carbon-coated Zn2SnO4 composites with exceptional cycling stability through precise optimization of the Zn:Sn molar ratio and carbon source content.

The optimized Zn2SnO4/C-4 electrode delivers a remarkable specific capacity of 470.1 mAh g⁻¹ after 100 cycles at 0.1 A g⁻¹ and maintains a stable capacity of 102.4 mAh g⁻¹ after 1000 cycles at 1 A g⁻¹. Furthermore, the Zn2SnO4/C//AC demonstrates outstanding electrochemical performance, achieving a high energy density of 164.2 Wh kg⁻¹, an impressive power density of 24 kW kg⁻¹, and excellent long-term cyclability with 81.5 % capacity retention after 5,000 cycles.