Porous Core–Shell CuCo₂S₄ Nanospheres as Anode Material for Enhanced Lithium‐Ion Batteries

Abstract

Porous core–shell CuCo2S4 nanospheres that exhibit a large specific surface area, sufficient inner space, and a nanoporous shell were synthesized through a facile solvothermal method. The diameter of the core–shell CuCo2S4 nanospheres is approximately 800 nm„ the radius of the core is about 265 nm and the thickness of the shell are approximately 45 nm, respectively. On the basis of the experimental results, the formation mechanism of the core–shell structure is also discussed. These CuCo2S4 nanospheres show excellent Li storage performance when used as anode material for lithium‐ion batteries. This material delivers high reversible capacity of 773.7 mA h g−1 after 1000 cycles at a current density of 1 A g−1 and displays a stable capacity of 358.4 mA h g−1 after 1000 cycles even at a higher current density of 10 A g−1. The excellent Li storage performance, in terms of high reversible capacity, cycling performance, and rate capability, can be attributed to the synergistic effects of both the core and shell during Li+ ion insertion/extraction processes.

Towards high-performance anodes: Design and construction of cobalt-based sulfide materials for sodium-ion batteries

“…Similarly, as displayed in Fig. 1(f), CuCo 2 S 4 possess the normal spinel structure (Fd-3 m, a = b = c = 9.474 Å), in which Cu 2+ and Co 3+ occupy the tetrahedral and the octahedral positions, respectively [63,64]. This structure possesses numerous vacancies that contain Na + during the discharge process and thus improves the electrochemical performance (See Table 4).…”

Graphene‐integrated CuCo 2 S 4 microspheres as a sustainable anode material for high‐performance Li‐ion batteries

“…This cathodic peak is attributed to the reduction or lithiation process of Co 2+ or Co 3+ to Co metal. [9][10][11][12][13] The other reduction peak at around 1.56 was shifted towards $1.6 V (vs Li/Li + ), which corresponded to the decomposition of the lithiated anode to form a stable phase of Co or Cu metal. 13,38 Figure 6B portrays the successive CV curves of the hybrid CuCo 2 S 4 -rGO anode; only two reduction peak at $1.0 and 1.27 V (vs Li/Li + ), and two oxidation peaks located at $2.0 and 2.3 V (vs Li/Li + ) were detected in the first CV curve.…”

“…The enhanced I D /I G intensity ratio of the hybrid compound sample may be linked with the formation of smaller and new sp2 domains caused by the reduction of GO to reduced graphene oxide (rGO) in the hydrothermalprocess, 9,37 suggesting the hybridization of CuCo 2 S 4 and rGO. In addition to material phase identification from XRD results and structural finger-printing using Raman spectrum analysis, the near-surface chemical binding states were estimated by performing XPS measurement.…”

“…A comparative electrochemical LIBs anode performance of our CuCo 2 S 4 -rGO anode with other Cu/Co-bases anodes is summarized in Figure 1 and Table S1. [8][9][10][11][12][13][14] 2 | EXPERIMENTAL SECTION…”

Synthesis of Porous Ni‐Doped CoSe2/C Nanospheres towards High‐Rate and Long‐Term Sodium‐Ion Half/Full Batteries

“…The graphite materials that are commonly used in lithiumion batteries (LIBs) are difficultt oa pply as anode materials for SIBs due to their smalli nterlayer distance and low capacity. [9] To date, various materials have been investigated as anodes for SIBs, such as metal oxides, [10] metal sulfides, [11][12][13] alloys, [14] and metal phosphides. [15][16][17] The development of these materi-als has significantly improvedt he performance of SIBs.…”