Synergistic Dual Electrolyte Additives Enhancing the Interface Stability of Li 3 VO 4 /C Anodes

The practical deployment of Li 3 VO 4 (LVO) anodes has been impeded by their unstable electrode–electrolyte interface and sluggish ion transport. An unstable solid electrolyte interphase (SEI) leads to persistent electrolyte consumption and progressive structural degradation, while slow Li + -diffusion kinetics result in poor rate performance. To address these challenges, we designed a synergistic electrolyte system incorporating LiDFP (LiPO 2 F 2 ) as a salt-type additive and fluoroethylene carbonate (FEC) as a solvent-type additive. When paired with a carbon-coated LVO nanosheet anode (LVO/C), this tailored electrolyte promotes the formation of a robust and ion-conductive organic–inorganic hybrid SEI layer through the coordinated decomposition of both additives. This stable interphase effectively reduces interfacial resistance, facilitates rapid Li + transport, and suppresses transition-metal dissolution. As a result, the LVO/C electrode achieves a high reversible capacity of 667.8 mAh g –1 at 0.5 A g –1 and remarkable long-term cyclability, retaining 91.3% of its capacity after 2000 cycles at 4.0 A g –1 . This study highlights the effectiveness of dual-additive electrolyte strategies in enabling high-performance LVO anodes for advanced lithium-ion batteries.