High‐Capacity and Kinetically Accelerated Lithium Storage in MoO₃ Enabled by Oxygen Vacancies and Heterostructure

Abstract

Molybdenum trioxide (MoO3) has recently aroused intensive interest as a renowned conversion‐type anode of Li‐ion batteries (LIBs). Nevertheless, the inferior rate capability, sluggish reaction kinetics, and fast capacity decay during a long‐term charge/discharge process seriously inhibits large‐scale commercial application. Herein, abundant oxygen vacancies and MXene nanosheets are elaborately introduced into MoO3 nanobelts through hydrazine reduction and electrostatic assembly to accelerate the ionic and electronic diffusion/transport kinetics for LIBs. Benefitting from the accelerated ion diffusion kinetics, enhanced electrical conductivity, and additional active sites induced by oxygen vacancies as well as the robust interfacial contact, the prepared MoO3−x/MXene heterostructure exhibits excellent lithium‐ion storage performances. First‐principles calculations indicate that the adsorption of Li+ ion and the electrical conductivity are significantly enhanced for the MoO3−x/MXene heterostructure. Thus, the composite exhibits high reversible capacity of 1258 mAh g−1 at 0.1 A g−1 for Li‐ion storage and retains 474 mAh g−1 at 10 A g−1, remarkably higher than those of the previously reported MoO3‐based anode materials. More importantly, the composite is fabricated with commercial LiFePO4 into a full LIB, which displays an unparalleled energy density of 330 Wh kg−1.

Zn–O–C bonds for efficient electron/ion bridging in ZnSe/C composites boosting the sodium-ion storage

“…50 The capacity of ZnSe/C is slightly attenuated in the first 100 cycles due to the formation of stable SEI films. 72–74 Overwhelmingly, the capacity can remain at 434 mA h g −1 after 500 cycles with a coulombic efficiency of about 100% from as seen in Fig. 4a.…”

“…Fig. 5c shows a good linear relationship between log I and log v following formula (2): 50,72,77 log I = b log v + log a in which a and b are adjustable values. When b is close to 1, the electrochemical behavior of ZnSe/C is controlled by pseudo-capacitance behavior; when b is close to 0.5, it is controlled by a diffusion step.…”

Oxygen deficient α-MoO3 with enhanced adsorption and state-quenching of H2O for gas sensing: a DFT study

“…Along with the enhanced electrical conductivity and additional active sites induced by V O , MoO 3- x electrodes exhibit superior rate performance and excellent cycling stability. 14–16 Furthermore, the work function of α-MoO 3 is tunable with the defective levels induced by V O , which has been utilized in the design of the MoS 2 /α-MoO 3- x heterojunction as a phototransistor with a high detectivity of 9.8 × 10 16 cm Hz 1/2 W −1 . 17 Meanwhile, the defective levels can achieve near infrared (NIR) absorption and localized surface plasmon resonance (LSPR) effects, making α-MoO 3- x promising as a biodegradable nanoagent for photothermal cancer therapy.…”

Eliminating Stubborn Insulated Deposition by Coordination Effect to Boost Zn Electrode Reversibility in Aqueous Electrolyte

“…The huge advantages in energy density, cycle stability, and output voltage make lithium-ion batteries (LIBs) available and popular ( Clément et al, 2020 ; Liu et al, 2021 ; Zhang et al, 2021 ), while frequent reports on fire and explosion of LIBs, due to the flammability of organic electrolytes, raised people’s concerns on their safety ( Zhu et al, 2021 ; Xu and Jiang, 2021). Aqueous rechargeable zinc-ion batteries (ZIBs) with high theoretical capacities (volumetric capacity of 5,855 mA h cm −3 and gravimetric capacity of 820 mA h g −1 ), low cost, and absolute security characteristics are practical alternatives ( Liu et al, 2019 ; Qiu et al, 2019 ; Wu H Y et al, 2021 ).…”

“…However, ZIBs face a series of severe challenges especially for zinc anodes, including dendrite growth and related parasitic reactions caused by free water (such as HER and by-product) ( Yang et al, 2020 ; Sun H et al, 2021 ). Many methods have been reported to improve the performance of ZIBs by inhibiting hydrogen evolution or dendrite in aqueous electrolytes and proved to be effective, such as electrolyte additives ( Soundharrajan et al, 2020 ; Guo et al, 2021 ; Hao et al, 2021 ; Guan et al, 2022 ), artificial SEI layers ( Hao et al, 2020 ; Di et al, 2021 ; Hong et al, 2021 ; Shin et al, 2021 ), and zinc anode modification ( Yang et al, 2021 ; Zhang et al, 2021 ; Zhang et al, 2021 ; Zhou et al, 2021 ). Nevertheless, the side reactions between Zn and aqueous electrolyte have rarely been paid attention to, which closely caused the decreased capacity and poor stability of the battery.…”