Flowerlike Ti-Doped MoO₃ Conductive Anode Fabricated by a Novel NiTi Dealloying Method: Greatly Enhanced Reversibility of the Conversion and Intercalation Reaction

Abstract

Anodes made of molybdenum trioxide (MoO3) suffer from insufficient conductivity and low catalytic reactivity. Here, we demonstrate that by using a dealloying method, we were able to fabricate anode of Ti-doped MoO3 (Ti-MoO3), which exhibits high catalytic reactivity, along with enhanced rate performance and cycling stability. We found that after doping, interestingly, the Ti-MoO3 forms nanosheets and assembles into a micrometer-sized flowerlike morphology with enhanced interlayer distance. The density functional theory result has further concluded that the band gap of the Ti-doped anode has been reduced significantly, thus greatly enhancing the electronic conductivity. As a result, the structure maintains stability during the Li+ intercalation/deintercalation processes, which enhances the cycling stability and rate capability. This engineering strategy and one-step synthesis route opens up a new pathway in the design of anode materials.

Molybdenum-Doped Nickel Disulfide (NiS2:Mo) Microspheres as an Active Anode Material for High-Performance Durable Lithium-Ion Batteries

“…In addition, partial amorphization of MoO 3 during initial cycling could also lead to an increase in the Li + ion diffusion kinetics, providing more accessible active sites for Li + insertion, and hence causing a gradual increase of the specific capacity. Similar cycling-induced capacity gain has been previously observed for MoO 3 -based anode materials. , Interestingly, the NiS 2 :Mo (5%) microsphere electrode delivered an exceptionally high initial specific capacity of 900 mAh g –1 , which exceeded the theoretically predicted specific capacity value of NiS 2 (807 mAh g –1 ), as well as previously reported specific capacity values for the TMO/TMS-based anode materials, as shown in Table . ,,− Even though the specific capacity of the electrode decreased gradually up to 50 th cycle, it retained a high reversible capacity of 713.3 mAh g –1 even after 120 cycles, with CE as high as 98.43%.…”

“…The peak appeared at 0.992 V is related to the partial dissolution of the SEI film . On the other hand, the peak appeared around 2.05 V is associated with the delithiation of Li + and oxidation of metallic Ni and formation of NiS 2 , and the peak appeared around 1.35 V corresponds to the oxidation of Mo to form MoO 3 . These conversion reactions can be described by the following equations It should be noted that the oxidation peak at 1.358 V disappeared in the 3 rd cycle, while the other peaks remained unchanged, which indicates that the incorporation of Mo in NiS 2 reduces the conversion reaction reversibility slightly, as observed in previous studies .…”

“…On the other hand, the peak appeared around 2.05 V is associated with the delithiation of Li + and oxidation of metallic Ni and formation of NiS 2 , and the peak appeared around 1.35 V corresponds to the oxidation of Mo to form MoO 3 . These conversion reactions can be described by the following equations It should be noted that the oxidation peak at 1.358 V disappeared in the 3 rd cycle, while the other peaks remained unchanged, which indicates that the incorporation of Mo in NiS 2 reduces the conversion reaction reversibility slightly, as observed in previous studies . After the first CV cycle, the observed reduction peaks during the first cycle appeared around 1.86 and 0.742 V were shifted to 1.87 and 0.73 V, and the oxidation peaks at 0.992 and 2.05 V were shifted to 1.01 and 2.04 V, respectively.…”

Nanoscale molybdenum oxide improves plant growth and increases nitrate utilisation in rice (Oryza sativa L.)

“…Nanoscale molybdenum oxide (nano‐MoO 3 ), like other typical nanomaterials, has attracted increased attention because of its application in electrochemical energy storage (Li et al, 2020), electrodes (Yan et al, 2020), sensors (Lin et al, 2020) and catalysis (Liu et al, 2020c). Nano‐MoO 3 enters the environment during manufacturing, application and disposal and, eventually accumulates in water, soil and sediment after migration and transportation (Cervantes‐Avilés et al, 2021; Lowry et al, 2019).…”

Dual Immobilization of SnOx Nanoparticles by N-Doped Carbon and TiO2 for High-Performance Lithium-Ion Battery Anodes

“…Lithium-ion batteries (LIBs), as advanced energy storage devices, have been currently used as main power sources in many fields. − However, in response to the rapid generalization of electric vehicles and mobile robots, the development of LIBs with higher performance is urgently required, especially the high energy density, fast charging capability, and abuse safety. In view of the current situation, we desperately need to exploit new-generation electrode materials, with high lithiation capacity, low electrochemical polarization potential, and excellent stability, and bring a quantum leap in the performance of LIBs.…”