Abstract
• CoMnHCF/CNT is prepared by co-precipitation method with an improved conductivity. • CoMnHCF/CNT delivers superior cycling performance and rate capacity as anode material for LIBs. • Ex-situ XRD is carried out to explore the redox mechanism of CoMnHCF during cycling. To explore inexpensive electrode materials with high energy density is urgent for developing next generation Li-ion batteries (LIBs). In this paper, a multi-metal Prussian blue analogue composited with carbon nanotube (KCo x Mn 1-x [Fe(CN) 6 ]/CNT), synthesized via a simple solution precipitation method, is employed as the anode for LIBs, which exhibits superior electrochemical performance. When cycled at 0.1 A g −1 , it delivers the reversible capacity up to 727.5 mA h g −1 during initial de-lithiation. In addition, this material presents excellent rate capability, yielding 452.3 and 408.7 mA h g −1 at 1 and 2 A g −1 , respectively. The improved performance may be associated with the effective connection between CNT and CoMnHCF particles to enhance the charge-transfer kinetics and lower the electrical resistance. Regarding the charge/discharge mechanism, the full reduction of Co 2+ , Mn 2+ and Fe 2+ in the initial lithiation process and the redox of Fe 2 O 3 /Fe 0 , CoO/Co 0 , MnO/Mn 0 in the subsequent cycles is proposed.
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