发展高性能负极材料对于提高锂离子电池的能量密度至关重要。合金类材料如锡、锑等，具备远高于商品化石墨负极材料的质量、体积比容量，被认为是下一代理想的锂离子电池负极材料。然而，这些材料在嵌脱锂过程中巨大的体积变化，造成迅速的容量衰减严重限制其发展。如何能够有效缓冲体积变化或抑制粉化后材料的再团聚，成为当前研究的热点。通过构建与石墨烯复合材料是应用最为广泛的方法，但石墨烯合成困难且价格昂贵。此前，申请人在对钒酸钴的研究中发现，该材料在嵌锂后会自发地形成类似于合金类材料/石墨烯的复合纳米结构（氧化钴/氧化钒）。其中，氧化钒起到了类石墨烯的作用，其不仅能够有效地抑制纳米粒子的团聚，更是提高了材料的电导率，使材料表现出优异的储锂特性。因此，合成含合金类材料的钒基双金属氧化物，有望获得高性能锂离子电池负极材料。然而，目前有关此类钒基双金属氧化物的储锂机理尚不清晰。基于上述认识，我们提出本项目研究。

Developing novel anode materials with high capacity, safety, and long cycling life is vital for improving the energy density of lithium ion batteries. Alloy-based materials, such as Sn, Sb, have long been recognized as promising candidates owing to their high capacities that are superior to the commercial graphite. However, the fast capacity fading upon charge/discharge are the main bottlenecks that hinder their practical applications. How to effectively accommodate the volumetric change or prevent the aggregations of pulverized particles has been a great focus. Constructing M/graphene (M=Sn, Sb…) nanocomposites are the most popular and effective methods to address this issue. But it is known that graphene is difficult to be synthesized and expensive. Recently, we have demonstrated the successful preparation of Co3V2O8 nanostructures and in detail studied the lithium-storage mechanism. An interesting surface-to-surface architecture that was generated upon the Li+ insertion and composed of CoO nanoparticles anchoring on amorphous VOx matrices showed the similar structure with M/C. The extracted VOx, which not only suppressed the volumetric changes but also significantly increased the ions/electrons transfer since the mixed valence of vanadium, played an important role in enhancing the battery performance. Therefore, designing new vanadium-based bi-metal oxides that contain the alloy-based materials may be a good solution to realize high-performance lithium-storage properties. However, there is a severe lack of the studies on the lithium-storage mechanism of these compounds. For reasons noted above, we propose this fundamental research.