Engineering Hierarchical CoO Nanospheres Wrapped by Graphene via Controllable Sulfur Doping for Superior Li Ion Storage

Abstract

The inferior conductivity and large volume expansion impair the widespread applications of metal oxide‐based anode materials for lithium‐ion batteries. To address these issues, herein an efficient strategy of structural engineering is proposed to improve lithium storage performance of hierarchical CoO nanospheres wrapped by graphene via controllable S‐doping (CoOS0.1 @ G). S‐doping promotes the Li+ diffusion kinetics of CoO by expanding the interplanar spacing of CoO, lowering the activation energy, and improving the pseudocapacitance contribution. Meanwhile, the electronic structure of CoO is adjusted by S‐doping as confirmed by density functional theory calculations, thus enhancing the conductivity. Finite element analysis reveals that the produced Li2S during lithiation improves the structural stability of the S‐doped electrode, which is further confirmed by experimental observation. As expected, CoOS0.1 @ G exhibits excellent lithium storage performance with an initial discharge capacity of 1974 mAh g−1 at 100 mA g−1, and high discharge capacity of 1573 mAh g−1 after 400 cycles at 500 mA g−1. It is believed that the insights into the structural doping enlighten research to explore other metal oxides for fast and stable Li ion storage.

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

“…Because of spin-orbit splitting, Co 2p spectrum could be respectively fitted to the Co 2p 1/2 and Co 2p 3/2 at 796.6 and 780.8 eV, as indicated in Figure 6B. [25] Meanwhile, the corresponding satellite peaks (Sat.) of Co 3 O 4 were detected at 796.7 and 786.2 eV.…”

Fast Charging Anode Materials for Lithium‐Ion Batteries: Current Status and Perspectives

“…SUCNs-SF 0.01-3.0 1230, 0.2 A g -1 137, 20 A g -1 375 mAh g -1 , 1500, 5 A g -1 [229] CoOS 0.1 @G 0.01-3.0 1441, 0.1 A g -1 627, 5 A g -1 1344 mAh g -1 , 500, 1 A g -1 [230] NiO/CNH 0.01-3.0 1740, 0.3C 450, 15C 424 mAh g -1 , 1500, 7.5C [231] MnO@NC 0.01-3.0 762, 0.1 A-g -1 358, 5 A g -1 624 mAh g -1 , 1000, 1 A g -1 [233] MoO 3 /graphene 0.01-3.0 710, 0.25 A g -1 260, 100 A g -1 ≈800 mAh g -1 , 700, 10 A g of nano-LTO and porous graphene endows the composite with effective Li + diffusion channels and electron-conducting networks, resulting in remarkable rate performance. LTO/N, S-PG maintains a specific capacity of 123 mAh g -1 even under 100C harsh charging current (Figure 9d).…”

“…Recently, CoOS 0.1 @G anode with excellent lithium storage performance was obtained using a controlled sulfidation method, which is displayed in Figure 11g. [ 230 ] It was studied by density functional theory (DFT), finite element simulation, and lithium‐ion migration kinetic analysis to demonstrate that the sulfide‐doped cobalt oxide exhibits faster lithium‐ion migration rate, higher pseudocapacitance contribution, and more stable electrode structure. This modification strategy of tuning the components and electronic structure provides a new idea for the further development of fast charging anode materials for lithium‐ion batteries.…”

“…Copyright 2017, Wiley-VCH. g) Structure model of CoOS 0.1 @G. Reproduced with permission [230]. Copyright 2020, Wiley-VCH.…”

Ultrahigh reversible lithium storage of hierarchical porous Co–Mo oxides via graphene encapsulation and hydrothermal S-doping

“…16 In addition to cationic doping, anionic doping has been proven effective in recent years. [17][18][19] Hu et al synthesized controllable S-doped CoOS 0.1 @G, which exhibits improved lithium storage performance compared with CoO@G. 20 S doping lowers the activation energy and enlarges the interplanar spacing, thereby improving the Li + diffusion kinetics of CoO. S-doped CoO-based binary metal oxides have never been evaluated as anode material in LIBs.…”