Zhang Zongping, Pei Cunyuan, Zhang Dongmei, Lu Junlin, Li Tao, Xiao Ting, Ni Shibing
College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang 443002, China.
Analysis and Testing Center, China Three Gorges University, Yichang 443002, China.
ACS Appl Mater Interfaces. 2022 Aug 10;14(31):35854-35863. doi: 10.1021/acsami.2c09863. Epub 2022 Jul 28.
While the comprehensive merits of high safety and high capacity make LiVO (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, the obtained LVO@NC NSs exhibit a high charge capacity of 628.4 mAh g 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 for 460 cycles, a high charge capacity of 610.3 mAh g remains. It also exhibits an outstanding long lifespan at the charge/discharge currents of 3.0/6.0 A g, delivering a high charge capacity of 277.0 mAh g 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.
尽管高安全性和高容量的综合优点使LiVO（LVO）成为锂离子电池潜在的负极材料，但LVO的实际应用受到不利的高倍率性能和不可扩展制备的严重阻碍。在此，通过可扩展且简洁的喷雾干燥方法制备了由初级LVO@NC纳米颗粒组装而成的LVO/N掺杂C纳米片（LVO@NC NSs）。二维形态和相互连接的LVO@NC成分赋予LVO@NC NSs持续优异的反应活性，从而带来突出的倍率性能。当在0.2 A g下循环时，所获得的LVO@NC NSs在300次循环后表现出628.4 mAh g的高充电容量，与初始充电容量相比几乎没有改善。在0.1至6.0 A g范围内进行9个周期的倍率测试共460次循环后，仍保持610.3 mAh g的高充电容量。在3.0/6.0 A g的充放电电流下，它还表现出出色的长寿命，在第5000次循环中提供277.0 mAh g的高充电容量。LVO@NC NSs可扩展且简洁的制备以及增强的高倍率性能使其作为高功率锂离子存储设备的负极候选材料具有巨大潜力。
