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

Bimetallic oxides have emerged as promising anode candidates for energy storage applications owing to their high theoretical specific capacity. 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. Based on structural optimization of materials and devices, it provides a promising strategy for designing high-performance bimetallic tin oxide anode and LIC, significantly expanding the application ranges and potential of bimetallic oxide materials in next-generation energy storage technologies.