Knowledge cluster: Spinel LiCo0.7Mn1.3O4 nanowire clusters, with each nanowire having a diameter of ca. 100-nm, result from a hydrothermal reaction between LiOH and Co0.35Mn0.65O2, obtained from K-birnessite at 150-°C. The nanowires demonstrate a good cycling stability and rate capability (improved by more than 50-%, compared to the bulk counterpart) in spite of their higher electrode density (3.4-g-mL-1) over a wide voltage range, between 4.7-V and 2-V.