Silicon sub-oxides, SiO x (0 < x < 1) can be regarded as a promising anode material for high performance Li-ion batteries for its unique electrochemical reactions to Li. We designed and synthesized the columnar-shape SiO x nanoconifers (0.9 < x < 1), directly self-organized on metallic NiSi x nanowires (NWs) for its anodic use in Li rechargeable batteries. The half-cell incorporating SiO x nanoconifers/NiSi x NW heterostructures displays good cyclic retention and rate capability, which are attributed to the structural and kinetic stability of the hierarchical SiO x nanoconifers rigidly supported by metallic NiSi x core NWs by providing a reversible electrochemical route with a lower activation energy.