Phosphorus‐Functionalized Fe₂VO₄/Nitrogen‐Doped Carbon Mesoporous Nanowires with Exceptional Lithium Storage Performance

Abstract

The binary transition metal oxides have attracted great attention because of their considerable energy and power densities. However, they suffer from low reaction kinetics and large volume change, limiting their practical energy applications. The construction of a mesoporous structure with a large surface area, the development of a carbon matrix, as well as heteroatom doping can effectively overcome the above challenges. Herein, the synthesis of phosphorous‐containing Fe2VO4/nitrogen‐doped carbon mesoporous nanowires (P‐Fe2VO4/NCMNWs) is reported. In this unique structure, the atomic‐level P‐doping could increase the conductivity of Fe2VO4 by reducing its band gap, which is confirmed by DFT calculations. Furthermore, the phosphorus can covalently “bridge” the carbon layer and Fe2VO4 through P−C and Fe−O−P bondings. As a result, this anode material exhibits a high capacity (1002 mA h g−1 at 0.5 A g−1 after 250 cycles), excellent rate performance (448 mA h g−1 at 10 A g−1), and prominent long‐term cycling stability (533 mA h g−1 at 5 A g−1 after 500 cycles, 364 mA h g−1 at 10 A g−1 after 1000 cycles). All of these attractive features make the P‐Fe2VO4/NCMNWs a promising electrode material for high‐performance lithium‐ion batteries.

Tailoring Oxygen Vacancies in CoMoO4 for Superior Lithium Storage

“…However, the conductivity would slowly decrease due to the structure deterioration, leading to further capacity decrease upon cycling. [50][51][52] Based on the above experimental results, the CoMoO 4 -N 2 exhibited excellent high-rate lithium-ion storage performance and cycling stability, which is comparable to the recently reported metal oxide electrode materials with superior electrochemical performance. [53][54][55] However, the specific capaci- ties and cycling performance of the CoMoO -Air are worse than CoMoO -N in all current densities, especially under the high rates.…”

“…Along with the cycling process, the active materials would be fully utilized and transform into finer quantum dots with more active sites, resulting in the initial arise of the specific capacity. However, the conductivity would slowly decrease due to the structure deterioration, leading to further capacity decrease upon cycling [50–52] . Based on the above experimental results, the CoMoO 4 ‐N 2 exhibited excellent high‐rate lithium‐ion storage performance and cycling stability, which is comparable to the recently reported metal oxide electrode materials with superior electrochemical performance [53–55] .…”

Electrochemical Generation of Hydrated Zinc Vanadium Oxide with Boosted Intercalation Pseudocapacitive Storage for a High-Rate Flexible Zinc-Ion Battery

“…The CV response current ( i ) complied with the sweep rate ( v ) on the basis of the equation of i = av b , and the number of b is determined by the electrochemical behavior of the battery. When the value of b is close to 0.5, it indicates a diffusion-controlled process resulting from battery-type intercalation, whereas value b close to 1 suggests the surface-controlled capacitive storage process. , The b values of peaks 1 and 2 are evacuated to supervise the electrochemical behavior evolution under different scan rates (Figure H). With v ≤ 0.7 mV s –1 , the b values of peaks 1 and 2 are calculated to be 0.92 and 0.94, respectively, indicating that the pseudocapacitive contribution is dominating.…”

“…It is reported that the crystal water and appropriate lattice defects are in favor of the rapid insertion/diffusion kinetics. 31 To compare the charge-storage kinetics in the VOH/CC and ZnVOH/CC electrodes, the diffusion coefficient D was 47,48 The b values of peaks 1 and 2 are evacuated to supervise the electrochemical behavior evolution under different scan rates (Figure 4H). With v ≤ 0.7 mV s −1 , the b values of peaks 1 and 2 are calculated to be 0.92 and 0.94, respectively, indicating that the pseudocapacitive contribution is dominating.…”

Bimetallic Antimony–Vanadium Oxide Nanoparticles Embedded in Graphene for Stable Lithium and Sodium Storage

“…A high capacity of 1002 mAh g −1 at 0.5 A g −1 was obtained due to the considerable specific surface area and increased conductivity, as well as the robust structure provided by the P "bridge" between Fe 2 VO 4 and carbon sheets. 19 Despite great progress achieved in bimetallic oxides, it still remains a significant challenge to meet the overall electrochemical performance for both LIBs and SIBs. Bimetallic antimony−vanadium oxides (SbVO 4 ) possess superior electrochemical activity by virtue of their dense crystal structure, composition, interface, and active sites.…”