One-Pot Synthesis and High Electrochemical Performance of CuS/Cu1.8S Nanocomposites as Anodes for Lithium-Ion Batteries

Abstract

CuS and Cu1.8S have been investigated respectively as anodes of lithium-ion batteries because of their abundant resources, no environment pollution, good electrical conductivity, and a stable discharge voltage plateau. In this work, CuS/Cu1.8S nanocomposites were firstly prepared simultaneously by the one-pot synthesis method at a relatively higher reaction temperature 200 °C. The CuS/Cu1.8S nanocomposites anodes exhibited a high initial discharge capacity, an excellent reversible rate capability, and remarkable cycle stability at a high current density, which could be due to the nano-size of the CuS/Cu1.8S nanocomposites and the assistance of Cu1.8S. The high electrochemical performance of the CuS/Cu1.8S nanocomposites indicated that the CuxS nanomaterials will be a potential lithium-ion battery anode.

The Synergetic Effect Induced High Electrochemical Performance of CuO/Cu2O/Cu Nanocomposites as Lithium-Ion Battery Anodes

“…The equivalent circuit is shown in Figure 6A inset, and the parameters of R s represents the ohmic resistance, R cf signifies the impedance of the SEI layer, R ct denotes the charge transfer resistance, W 1 designates the Warburg impedance ( Wang t al., 2020b ; Murphin Kumar et al, 2020 ; Wang et al, 2021b ; Li et al, 2021c ). Moreover, the Li-ions diffusion coefficient ( ) can be calculated by the equations below according to the EIS data in the low-frequency region ( Shen et al, 2013 ; Zhou et al, 2014 ; Wang et al, 2020a ; Gao et al, 2020 ). The physical quantities of R , T , A , n , F , C , and σ denote the gas constant, the measuring temperature, the surface area of the electrode, the number of transferred electrons, the Faraday constant, the concentration of lithium ions, and the Warburg coefficient, respectively ( Shen et al, 2013 ; Zhou et al, 2014 ; Wang et al, 2020a ).…”

“…Moreover, the Li-ions diffusion coefficient ( ) can be calculated by the equations below according to the EIS data in the low-frequency region ( Shen et al, 2013 ; Zhou et al, 2014 ; Wang et al, 2020a ; Gao et al, 2020 ). The physical quantities of R , T , A , n , F , C , and σ denote the gas constant, the measuring temperature, the surface area of the electrode, the number of transferred electrons, the Faraday constant, the concentration of lithium ions, and the Warburg coefficient, respectively ( Shen et al, 2013 ; Zhou et al, 2014 ; Wang et al, 2020a ). The value of σ could be fitted by Eq.…”

“…The equivalent circuit is shown in Figure 6A inset, and the parameters of R s represents the ohmic resistance, R cf signifies the impedance of the SEI layer, R ct denotes the charge transfer resistance, W 1 designates the Warburg impedance (Wang t al., 2020b;Murphin Kumar et al, 2020;Wang et al, 2021b;Li et al, 2021c). Moreover, the Li-ions diffusion coefficient (D Li + ) can be calculated by the equations below according to the EIS data in the low-frequency region (Shen et al, 2013;Zhou et al, 2014;Wang et al, 2020a;Gao et al, 2020).…”

“…The physical quantities of R, T, A, n, F, C, and σ denote the gas constant, the measuring temperature, the surface area of the electrode, the number of transferred electrons, the Faraday constant, the concentration of lithium ions, and the Warburg coefficient, respectively (Shen et al, 2013;Zhou et al, 2014;Wang et al, 2020a). The value of σ could be fitted by Eq.…”

“…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 ). However, the traditional graphite anodes cannot meet further demands of high-power hybrid electric vehicles in the future because of the relatively inferior rate performance and the low theoretical capacity (372 mAh/g) ( Shen et al, 2013 ; Zhang et al, 2013 ; Zhou et al, 2014 ; Wang et al, 2020 ; Pan et al, 2020 ; Wang et al, 2021 ). The transition metal oxides have been widely researched for their low cost, widespread availability, and high theoretical capacities (500–1,000 mAh/g) ( Shen et al, 2013 ; Zhang et al, 2013 ; Zhou et al, 2014 ; Ananya et al, 2016 ; Pan et al, 2020 ).…”