Hierarchical Self-Assembly Strategy for Scalable Synthesis of Li3VO4/N Doped C Nanosheets for High-Rate Li-Ion Storage

作者：Zhang, Zongping; Pei, Cunyuan^*; Zhang, Dongmei; Lu, Junlin; Li, Tao; Xiao, Ting; Ni, Shibing^*

来源：ACS applied materials & interfaces, 2022, 14(31): 35854-35863.

DOI：10.1021/acsami.2c09863

• lithium-ion batteries
• anode
• lithium vanadate
• spray drying
• nanosheets
• high rate

While the comprehensive merits of high safety and high capacity make Li3VO4 (LVO) a potential anode material for lithium-ion batteries, the practical application of LVO was severely impeded by the unfavorable high-rate capability and unscalable preparation. Here, LVO/N doped C nanosheets (LVO@NC NSs) assembled from primary LVO@NC nanoparticles are prepared via a scalable and concise spray drying approach. The 2D morphology and the interconnected LVO@NC constituents endow the LVO@NC NSs with continuously excellent reaction activity, leading to prominent rate performance. When cycling at 0.2 A g(-1), the obtained LVO@NC NSs exhibit a high charge capacity of 628.4 mAh g(-1) after 300 cycles, showing little improvement compared with the initial charge capacity. After 9 periods of rate testing ranging from 0.1 to 6.0 A g(-1) for 460 cycles, a high charge capacity of 610.3 mAh g(-1) remains. It also exhibits an outstanding long lifespan at the charge/discharge currents of 3.0/6.0 A g(-1), delivering a high charge capacity of 277.0 mAh g(-1) in the 5000th cycle. The scalable and concise preparation as well as the enhanced high-rate capability of the LVO@NC NSs make them hold great promise as an anode candidate for high-power lithium-ion storage devices.