Abstract
Due to the high theoretical capability, copper-based oxides were widely investigated. A facile water bath method was used to synthesis CuO nanowires and CuO/Cu2O/Cu nanocomposites. Owing to the synergetic effect, the CuO/Cu2O/Cu nanocomposites exhibit superior electrochemical performance compared to the CuO nanowires. The initial discharge and charge capacities are 2,660.4 mAh/g and 2,107.8 mAh/g, and the reversible capacity is 1,265.7 mAh/g after 200 cycles at 200 mA/g. Moreover, the reversible capacity is 1,180 mAh/g at 800 mA/g and 1,750 mAh/g when back to 100 mA/g, indicating the excellent rate capability. The CuO/Cu2O/Cu nanocomposites also exhibit relatively high electric conductivity and lithium-ion diffusion coefficient, especially after cycling. For the energy storage mechanism, the capacitive controlled mechanism is predominance at the high scan rates, which is consistent with the excellent rate capability. The outstanding electrochemical performance of the CuO/Cu2O/Cu nanocomposites indicates the potential application of copper-based oxides nanomaterials in future lithium-ion batteries.
Highlights
IntroductionRechargeable Lithium-ion batteries (LIBs) have been widely used in many fields, such as electric vehicles, cameras, and other portable electronic devices, because of their high working potential, lack of memory effect, and high energy density (Wang et al, 2020; Hu et al, 2020; Teng et al, 2020; Zhang et al, 2020; Zuo and Gong, 2020; Li et al, 2021; Wang et al, 2021; Li et al, 2021; Li et al, 2021d; Wu et al, 2021; Liang et al, 2022)
Our results indicate that the copper-based oxides anodes with a synergetic effect will satisfy the demands of the next-generation Lithium-ion batteries (LIBs)
CuO/Cu2O/Cu nanocomposites and CuO nanowires were prepared by a facile water bath method
Summary
Rechargeable Lithium-ion batteries (LIBs) have been widely used in many fields, such as electric vehicles, cameras, and other portable electronic devices, because of their high working potential, lack of memory effect, and high energy density (Wang et al, 2020; Hu et al, 2020; Teng et al, 2020; Zhang et al, 2020; Zuo and Gong, 2020; Li et al, 2021; Wang et al, 2021; Li et al, 2021; Li et al, 2021d; Wu et al, 2021; Liang et al, 2022). There are some intrinsic disadvantages, such as volume expansion and low electric conductivity during the charge-discharge process, which should be resolved (Shen et al, 2013; Zhang et al, 2013; Zhou et al, 2014; Ananya et al, 2016; Pan et al, 2020) To solve these problems, many different kinds of nanostructures and morphologies were designed and prepared by many kinds of methods (Wang et al, 2014; Wang et al, 2014; Xu et al, 2016; Kim et al, 2019; Yuan et al, 2019; Zhang et al, 2021). Cu2O@GO composite with a core-shell structure was synthesized, exhibiting a discharge capacity of 458 mAh/g (Xu et al, 2015)
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