Hollow Concave Zinc‐Doped Co₃O₄ Nanosheets/Carbon Composites as Ultrahigh Capacity Anode Materials for Lithium‐Ion Batteries

Abstract

Composition‐structure strategy is an effective method to improve the electrochemical performance of lithium‐ion batteries (LIBs). Ideal active materials combined with unique structure can lead to potential candidates for next‐generation LIB anode materials. In this research, we designed a hollow concave Zn‐doped Co3O4 nanosheets/carbon composites as active electrodes for LIBs. The hollow concave structure could shorten the path length of Li+ and electron transfer. The interconnected Co3O4 nanosheets could construct a conductive network and enhance the composites’ conductivity. Moreover, defects produced by Zn doping in the Co3O4 phase improves the electronic structure of Co3O4, endowing superior electrochemical performances for the doped Co3O4‐based composites. As expected, the optimized hollow concave Zn‐doped Co3O4/C composites exhibited high specific capacities with stable cyclability (750 mA h g−1 at 500 mA g−1 after 300 cycles) and excellent rate performances (723.5 mA h g−1 at 3.0 A g−1).

High Cycle Stability of Hybridized Co(OH)2 Nanomaterial Structures Synthesized by the Water Bath Method as Anodes for Lithium-Ion Batteries

“…According to the conversion reaction with lithium ions, transition metal oxides are promising anodes for LIBs due to their high theoretical capacities (500-1000 mAh/g) [18,19]. To achieve practical application, cobalt oxides, including CoO and Co 3 O 4 , have been intensely investigated to solve the intrinsic disadvantages of volume change and low electrical conductivity during the discharge-charge process [20][21][22][23]. As a precursor, Co(OH) 2 has always been used to prepare cobalt-based oxides by heat treatment [24][25][26].…”

Porous nanofibers comprising hollow Co 3 O 4 / Fe 3 O 4 nanospheres and nitrogen‐doped carbon derived by Fe@ ZIF ‐67 as anode materials for lithium‐ion batteries

“…The additional peaks at binding energy of 532.7 and 534.3 eV are attributed to the absorbed H 2 O on the sample. 35,36 The C 1s XPS spectrum shown in Figure 4D presents the sp 2bonded carbon (C═C) peak at 284.2 eV, C N and C C peaks at 285.1 eV, and C═O peak at 288 eV. 37,38 The presence of graphitic carbon in A300NF is confirmed by the highest intensity of C C peak among those peaks (Figure 4D).…”

“…The metal‐oxygen peaks appear at 530.8 eV in the O 1s spectrum, as shown in Figure 4C. The additional peaks at binding energy of 532.7 and 534.3 eV are attributed to the absorbed H 2 O on the sample 35,36 . The C 1s XPS spectrum shown in Figure 4D presents the sp 2 ‐bonded carbon (C═C) peak at 284.2 eV, CN and CC peaks at 285.1 eV, and C═O peak at 288 eV 37,38 .…”

The Review of Hybridization of Transition Metal-Based Chalcogenides for Lithium-Ion Battery Anodes

“…The Zn-doped Co 3 O 4 nanocomposites with a hollow concave structure displayed excellent rate capability and high specific capacities with stable cyclability. The outstanding electrochemical performance originated from the unique hollow concave structure and the defects induced by Zn doping, which could effectively improve the electronic structure of Co 3 O 4 composites and then enhance the electrochemical reaction kinetics [ 36 ]. Wu et al reported that the binary transition metal Cu 3.8 Ni was doped with CoO and MnO.…”