In this work, we firstly synthesized the high-quality nanocellulose from the waste reed, a low-cost biomass, and designed the nanostructure for energy applications. We successfully constructed bead-like Lithium vanadium phosphate/nanofiber carbon (LVP/NC) multi-structure by self-assembly based on the nanocellulose framework. During the carbonization process, the nanocellulose turn into porous carbon nanofiber into which LVP nanoparticles can be embedded to form a bead-like structure. The unique structure can endow the effective electron contacts and ions transportation. As cathode for Li ion batteries, the composite exhibits the discharge capacity of 131.6 mA h/g, which is close to the theoretical specific capacity. Moreover, the composites reveal an excellent long-cycle performance. At 10 C, the capacity retention is near 90% after 1000 cycles. With the excellent performance, this bead-like composites shows great application value and the facile synthesis strategy can be used for preparing other cathode with high performance.

在这项工作中，我们首先从废芦苇（一种廉价的生物质）合成了高质量的纳米纤维素，并设计了用于能源应用的纳米结构。我们通过基于纳米纤维素框架的自组装成功构建了珠状磷酸钒锂/纳米纤维碳（LVP / NC）多层结构。在碳化过程中，纳米纤维素变成了多孔碳纳米纤维，LVP纳米颗粒可以嵌入其中，形成珠状结构。独特的结构可以赋予有效的电子接触和离子传输。作为锂离子电池的正极，该复合材料的放电容量为131.6 mA h / g，接近理论比容量。此外，该复合材料还具有出色的长循环性能。在10 C下，经过1000个循环后，容量保持率接近90％。