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

Abstract

Bimetallic oxides have received considerable attention as anodes for lithium/sodium-ion batteries (LIBs/SIBs) due to their high electrochemical activity and theoretical specific capacity. However, their cycling performance is limited by large volume variation, severe aggregation, and pulverization of bimetallic oxide nanoparticles during repeated metal ion insertion/extraction processes. Herein, bimetallic antimony–vanadium oxide nanoparticles embedded in graphene (SbVO4/G) composites are prepared by a one-step hydrothermal method. Bimetallic SbVO4 with abundant redox reaction sites can provide high specific capacity by a multi-electron reaction. A robust graphene substrate can not only alleviate volume expansion but also prevent aggregation and collapse of highly active bimetallic SbVO4. Due to the excellent synergy between the two building components, SbVO4/G hybrids exhibit excellent electrochemical activity, structural stability, and electrochemical performance. When employed as anodes for LIBs and SIBs, SbVO4/G composites display excellent cycling performance (1079.5 mAh g–1 at 0.1 A g–1 after 150 cycles for LIBs and 401.6 mAh g–1 at 0.1 A g–1 after 450 cycles for SIBs) and impressive rate capability. This work demonstrates that SbVO4/G composites are promising anodes for both LIBs and SIBs.

Vanadium-Tailored Silicon Composite with Furthered Ion Diffusion Behaviors for Longevity Lithium-Ion Storage

“…It is important to note that all of the CV curves have no prominent characteristic peak associated with vanadium doped, which shows that the vanadium in the electrode of the lithium alloying/dealloying process does not participate in the reaction but as a buffer in the substrate material, maintaining the stability of the electrode structure and improving the electronic conductivity of electrode materials. 45,46 According to relevant reports, battery-type electrode materials also show similar lithium storage mechanisms at their surface and interface, especially when electrode materials have a large specific surface area. 29,30 This charge storage mechanism is very rapid and helps to enhance the rate performance of electrode materials.…”

Carbon Encapsulated and rGO Wrapped Mo2C: an Anode Material with Enhanced Sodium Storage Capacity

“…Warburg coefficient (σ) can be estimated from the slope of the Z' vs ω À 0.5 [Eq. (7), where, ω is the frequency (Figure S7)].…”

“…In 1970s advancement of lithium‐ion battery was very prominent due to its better performance. Later, researchers started focusing on advancement in sodium ion batteries due to higher abundance of sodium which led to low‐cost batteries [1–10] . The prime obstacle in advancement of sodium ion battery (SIB) research is the nonavailability of suitable anode material.…”

“…Later, researchers started focusing on advancement in sodium ion batteries due to higher abundance of sodium which led to low-cost batteries. [1][2][3][4][5][6][7][8][9][10] The prime obstacle in advancement of sodium ion battery (SIB) research is the nonavailability of suitable anode material. Graphite anode is not suitable anode for SIB due to unfavourable thermodynamic stability of sodiated graphite.…”

Carbon-Confined Two-Dimensional Sodiophilic Sites Boosted Dendrite-Free Sodium Metal Anodes

“…The construction of metallic Na hosts is one of the most effective methods to manipulate dendrite growth. Benefiting from the unique structural feature and tuneable electrical properties, two-dimensional (2D) carbon materials are considered one of the best hosts of metal anodes. − Nevertheless, carbon materials naturally lack affinity with Na, and so introducing metal/metal compound nanoparticles into the carbon matrix is one of the most common methods to enhance the sodiophilicity, such as designing 2D carbon nanosheets embedded with Bi or 2D Sn/C nucleation layers. , However, foreign metal/metal compound active centers are usually nanoparticles, which disperse on the surface of the carbon matrix randomly. − The practical performance is largely restrained by the agglomeration of metal/metal compound nanoparticles with repeated sodiation/desodiation and low utilization of active sites. − It is conceivable that if the metal/metal compound active centers are designed as an atomically thin 2D plane instead of zero-dimensional (0D) nanoparticles, they can not only form a continuous surface active region but also improve the utilization of the metal/metal compound. In addition, encapsulating the 2D metal/metal compound active region into the carbon nanosheets can further prevent the exfoliation of active centers during the charge/discharge process.…”