Full-molar-ratio synthesis and enhanced lithium storage properties of CoxFe1−xCO3 composites with an integrated lattice structure and an atomic-scale synergistic effect

摘要: Multicomponent composites with an integrated lattice structure can possess atomic-scale distribution of different components within the crystallites and may express enhanced synergistic effect compared to mechanical mixture. In this paper, a series cobaltous-ferrous carbonates CoxFe1−xCO3 (x = 0, 0.2, 0.4, 0.6, 0.8 1) have been synthesized via facile hydrothermal route assistance ascorbic acid (AA). The four multicomponent exhibit hexagonal structures similar those monocomponents FeCO3 CoCO3, resulting rodlike give aspect ratios unit-cell parameters linearly changed along increasing x value, indicating successful synthesis at arbitrary Co/Fe molar ratio. When used as lithium ion battery anodes, well inherit both high-conductivity characteristic CoCO3 low-rate cycling stability FeCO3. particular, each composite presents better electrochemical properties than corresponding xCoCO3 + (1 − x)FeCO3 mixture, mainly assigned inner formula CoxFe1−xCO3. Therefore, serve novel high-capacity LIB anode materials for practical application, also strategic approach is introduced full-molar-ratio composites.