Self‐Integrated Porous Leaf‐like CuO Nanoplate Array‐Based Anodes for High‐Performance Lithium‐Ion Batteries

Abstract

Developing high-energy-density lithium-ion batteries (LIBs) is of great significance for their wider commercialized application. The design of self-integrated electrodes can be treated as a valid approach to achieve this goal. In this work, a facile and low-cost wet chemical oxidation strategy is put forward to prepare self-integrated porous leaf-like CuO nanoplates on Cu foil substrates in situ. These nanoplates are then directly used as the anode for LIBs. The morphology, structure, and composition of the resultant CuO/Cu hybrid foils are characterized, and the relevant lithium storage properties of this anode are also investigated by using standard electrochemical tests. The results show that the CuO/Cu hybrid-based anode possesses a porous leaf-like morphology and self-integrated architecture. Benefitting from this unique morphology and favorable architecture, the CuO/Cu hybrid-based anode exhibits outstanding electrochemical performance, including excellent cycling stability and remarkable rate capability, demonstrating great potential in the application of high-energy-density LIBs.

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

“…The relatively high R total (117.53 Ω) and the low Li-ions diffusion coefficient (2.17 × 10 −13 cm 2 /s)of the CuO nanowires after cycling imply the low reversible capability of 385 mAh/g after 200 cycles shown in Figure 4. However, the CuO/Cu 2 O/Cu nanocomposites after cycling exhibit the lowest R cf (9.21 Ω), R ct (41.78 Ω), and R total (57.02 Ω), as well as the highest Li-ions diffusion coefficient (4.34 × 10 −12 cm 2 /s), indicating the higher electrochemical kinetics compared to the CuO nanowires, which are consistent with the outstanding electrochemical performance shown in Figures 4, 5 (Li et al, 2018;Hong et al, 2020;Liu et al, 2021). The outstanding electrochemical performance of the CuO/Cu 2 O/Cu nanocomposites could result from the unique nanocomposites structure and the synergetic effect of the components (Hu et al, 2013;Kim et al, 2016;Wang et al, 2020b;Murphin Kumar et al, 2020;Wang et al, 2021b;Li et al, 2021c).…”

“…The R cf , R ct , and the total resistance of R total for both CuO/Cu 2 O/Cu nanocomposites and CuO nanowires are much smaller after cycling, which indicates the increased electric conductivity due to the structure change and the formation of Cu component during the cycling process ( Li et al, 2018 ; Hong et al, 2020 ; Wang et al, 2020b ; Liu et al, 2021 ). The relatively high R total (117.53 Ω) and the low Li-ions diffusion coefficient (2.17 × 10 −13 cm 2 /s)of the CuO nanowires after cycling imply the low reversible capability of 385 mAh/g after 200 cycles shown in Figure 4 .…”

In Situ Fabrication of Hierarchical CuO@Cu Microspheres Composed of Nanosheets as High‐Performance Anode Materials for Lithium‐Ion Batteries

“…Obviously, the R s value of the electrode after cycling does not change too much compared to the one before cycling, while the R ct values increases slightly, due to the SEI formation. However, the value of Warburg impedance (σ w ) after 50 cycles is significantly reduced compared with the fresh state, indicating the diffusion of Li + will become faster in deep cycling, confirmed by the increased capacity after the initial cycles . Moreover, the relationship between real resistance (Z’) and total resistance (Z) is provided in Figure S6 (Supporting Information), confirming the slightly reduced total resistance after 50 cycles.…”

“…On the other hand, various CuO micro‐nanostructures and hybrids have been fabricated to enhance the structural stability and electrochemical performance for LIBs. In this respect, CuO/Cu hybrids, flower‐like/thorn‐like CuO/C microspheres, dandelion‐like nanocomposites, porous nanorods, pompon‐like hierarchical hollow microspheres, hollow octahedral, hollow nanospheres, porous nano‐labyrinths, Cu 1.5 Mn 1.5 O 4 nanoplates/hollow CuO, Mn 3 O 4 /CuO@TiO 2 submicroboxes, and yolk‐shell CuO@CuFe 2 O 4 composites have been reported. The unique nanostructure of the material can provide a continuous electron pathway and greatly shorten the distance for Li‐ion diffusion, which can effectively enhance the rate capability.…”

Double‐Shelled Hollow SiO2@N‐C Nanofiber Boosts the Lithium Storage Performance of [PMo12O40]3−

“…The lower the slope of Z' vs. ω À 1/2 , the faster the Li ions diffusion rate was. [52,53] It showed that the σ value of PMo 12 À SiO 2 @NÀ C electrode dropped sharply from 810 (before cycling) to 14 (after 1000 cycles) (Figure 5b). The σ value of SiO 2 @NÀ C electrode showed a similar trend, which dropped from the initial 136 to 21 after 1000 cycles (Figure S12).…”