The obtained CCHH/Mo-S/P/A electrode delivered a high specific capacity of 4.29 C cm–2 (1429 C g−1) and outstanding cycling performance. A further P doping treatment could improve the Rct. Mo-S working as a sacrificial morphology-control layer induces the formation of the fluffy micro-sheets during activation, not only providing more active sites for electrochemical reaction of the cobalt carbonate hydroxide hydrate (CCHH), but also reducing the internal resistance by avoiding the active materials divorcing from the electrode while simultaneously increased the charge transfer resistance (Rct) of the electrode however. In this work, we propose a sacrificial Mo-S modification to address the problems. Nevertheless, the micro-morphology change is usually uncontrollable and would decrease the conductivity of the electrode materials. Electrochemical activation which could induce micro-morphology reconstruction has been demonstrated as an effective method to increase the specific surface area of electrode materials thereby enhancing the specific capacity.
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