Room temperature processed in-situ carbon-coated vanadium carbide (VC@C) as a high capacity robust Li/Na battery anode material

Mahajan, Mani; Roy, Kingshuk; Parmar, Swati; Singla, Gourav; Pandey, O. P.; Singh, K.; Vaidhyanathan, Ramanathan; Ogale, Satishchandra

doi:10.1016/j.carbon.2020.01.057

Cited by 26 publications

(24 citation statements)

References 61 publications

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“…After 50 cycles (Figure 4c), a reversible discharge capacity of 411 mAh g −1 and a CE of 100% are obtained, showing an excellent cycle stability (i.e., 99% of capacity retention from the 2nd to 50th cycles). The reversible capacity of our VO 2 (N) is much higher than the previously reported vanadium‐based anodes, e.g., VSe 2 /reduced graphene oxide (rGO) (365 mAh g −1 at 0.05A g −1 ), [ 25 ] V 2 O 3− x @rGO (240 mAh g −1 at 25 mA g −1 ), [ 26 ] VC@C (160 mAh g −1 at 0.1A g −1 ), [ 27 ] and VN (294 mAh g −1 at 0.05A g −1 ). [ 28 ] Besides, as shown in Figure S3 (Supporting Information), the VO 2 (N) is also superior to the allotropes of VO 2 (P) and VO 2 (R) (VO 2 (P): fast capacity decay; VO 2 (R): low capacity).The rate performance of the spindle‐like VO 2 (N) was further evaluated (Figure 4d).…”

Section: Resultsmentioning

confidence: 93%

Fast and Reversible Na Intercalation in Nsutite‐Type VO₂ Hierarchitectures

Chen

Yang

Jiang

et al. 2021

Adv Materials Inter

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Sodium‐ion batteries (SIBs), owing to the natural abundance and low cost of sodium resources, are the promising alternative to lithium‐ion batteries (LIBs) in the field of large‐scale energy storage. Nevertheless, the development of appropriate anodes for SIBs is still a challenge. Vanadium oxides with diverse crystallographic structures and high theoretical capacities hold large opportunities to construct high‐performance SIBs. Among them, new‐state nsutite‐type VO2 (VO2(N)) produced by the random intergrowth of rutile VO2(R) (superior structural stability but sluggish kinetics) and paramontroseite VO2(P) (high electronic/ionic conductivity but weak structural stability) have ample opportunity to obtain desirable sodium storage performance with high capacity, long lifespan, and rapid reaction dynamics. Herein, the spindle‐like VO2(N) is developed through a simple hydrothermal approach. It demonstrates a Na+ (de)intercalation mechanism and exhibits a high capacity of 411 mAh g−1 at 50 mA g−1 as well as outstanding high‐rate cyclic stability (103 mAh g−1 at 10 A g−1 over 6000 cycles). Furthermore, a high‐performance VO2(N)||Na3V2(PO4)2O2F full cell is developed, which shows that the VO2(N) anode has the potential for practical use.

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Section: Resultsmentioning

confidence: 93%

Fast and Reversible Na Intercalation in Nsutite‐Type VO₂ Hierarchitectures

Chen

Yang

Jiang

et al. 2021

Adv Materials Inter

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“…The obtained D Li+ values for the PMo 12 @PPy/Ti 3 C 2 T x (2.0 × 10 −11 cm 2 s −1 ) and Ti 3 C 2 T x (6.1 × 10 −12 cm 2 s −1 ) electrodes reflect 3.5 times higher diffusivity of lithium ions within the prepared PMo 12 @PPy/Ti 3 C 2 T x electrode than that of bare Ti 3 C 2 T x which are significantly high among the reported values. 54 Interestingly, after about hundred cycles a significantly high value of D Li+ was found for PMo 12 @PPy/Ti 3 C 2 T x . This value (D Li+ = 7.5 × 10 −10 cm 2 s −1 ) reflects an increase of about 35 times, commensurate with its remarkable performance.…”

Section: Methodsmentioning

confidence: 95%

“…Obviously, the PMo 12 @PPy/ Ti 3 C 2 T x electrode shows lower R CT and R SEI than that of the Ti 3 C 2 T x electrode, indicating the improved electron and ion transport in the former one. The EIS data was further employed to determine the Li + diffusion coefficient (D Li+ ) of the prepared electrodes by using the relation 54…”

Section: Methodsmentioning

confidence: 99%

Polypyrrole-Encapsulated Polyoxomolybdate Decorated MXene As a Functional 2D/3D Nanohybrid for a Robust and High Performance Li-Ion Battery

Mahajan

Singla

Ogale

2021

ACS Appl. Energy Mater.

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We have synthesized polypyrrole-encapsulated polyoxomolybdate (PMo 12 ) decorated Ti 3 C 2 T x MXene (PMo 12 @PPy/Ti 3 C 2 T x ) by a facile synthetic method and examined it as an anode material for lithium storage. Owing to the properties of electrostatic repulsion and self-assembly of PMo 12 -anions, the PPy molecules wrap the individual PMo 12 anions and help with the successful intercalation between the layers of Ti 3 C 2 T x . Consequently, the composite electrode exhibits superior lithium storage with high capacity (764 mAh g −1 at 0.1 A g −1 ), long cycling stability even at a high current rate (2000 cycles at 3 A g −1 ), and impressive rate performance. This unique 2D/3D architecture exhibits hybrid battery-capacitive behavior due to the synergistic effect between PPy encapsulated PMo 12 and Ti 3 C 2 T x . The battery component is a result of reversible redox reactions of metal ions (Mo), while the pseudocapacitive component is contributed by PPy and Ti 3 C 2 T x . These results suggest that suitably engineered MXene based hybrid materials hold great potential in the domain of energy storage.

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“…If we assume that vanadium was derived from organo-vanadium complexes of organic matter, then we need to identify a mechanism explaining how vanadium was sufficiently concentrated to crystallize into micro-sized particles of V carbide. One possible mechanism is suggested by the processes involved in concentrating and encapsulating V carbide in a carbon shell during mechanical and chemical synthesis in a planetary mill (Mahajan et al, 2020). In the case of shungite, it is unlikely that during the migration of the parent carbonaceous matter, conditions of mechanochemical synthesis, comparable to vigorous processes in a planetary mill, could be achieved.…”

Section: Discussionmentioning

confidence: 99%

“…However, shielding effectiveness is highest for sample ShR1 with elevated vanadium concentration and the presence of particles encapsulated in carbon shells. In this regard, it has also been shown that vanadium carbides enclosed in a carbon shell have impressive electrochemical characteristics and clear prospects for practical application as the most stable materials for batteries (Mahajan et al, 2020).…”

Section: Vanadium Distribution In Shungite Rocksmentioning

confidence: 99%

Vanadium carbides in shungite

Kovalevski

Moshnikov

2022

Eur. J. Mineral.

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Abstract. Four types of shungite rocks containing 98.2 wt %, 22.2 wt %, 21.6 wt % and 22.4 wt % C and 416, 311, 78 and 182 ppm V were studied, while the ash from these samples contained 23120, 400, 100 and 234 ppm V, respectively. The presence of two vanadium carbides, V2C and V6C5, in samples of shungite with a content of 98.2 wt % C has been revealed by energy dispersive spectroscopy (EDS) and selected-area electron diffraction (SAED). The vanadium carbides revealed are monocrystalline and encapsulated in a carbon shell and thus are the first well-crystallized natural examples of V carbides. The shungite-bearing rocks are Lower Proterozoic in age (2.0–2.1 Ga), and the encapsulation of vanadium carbides in carbon shells explains their good preservation during this time. Parageneses of vanadium carbide and roscoelite have also been found, indicating that roscoelite in shungite rocks may be a secondary mineral formed during the decomposition of vanadium carbide. It is possible that the decomposition of vanadium carbides due to the destruction of carbon shells with the formation of roscoelite occurred during the 1.8 Ga Svecofennian orogeny when the sediments were affected by greenschist-facies metamorphism. Particles encapsulated in carbon shells were also revealed in the shungite rock containing 22.2 wt % C and 311 ppm V, for which high shielding effectiveness is observed in a wide frequency range.

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Room temperature processed in-situ carbon-coated vanadium carbide (VC@C) as a high capacity robust Li/Na battery anode material

Cited by 26 publications

References 61 publications

Fast and Reversible Na Intercalation in Nsutite‐Type VO₂ Hierarchitectures

Fast and Reversible Na Intercalation in Nsutite‐Type VO₂ Hierarchitectures

Polypyrrole-Encapsulated Polyoxomolybdate Decorated MXene As a Functional 2D/3D Nanohybrid for a Robust and High Performance Li-Ion Battery

Vanadium carbides in shungite

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Room temperature processed in-situ carbon-coated vanadium carbide (VC@C) as a high capacity robust Li/Na battery anode material

Cited by 26 publications

References 61 publications

Fast and Reversible Na Intercalation in Nsutite‐Type VO2 Hierarchitectures

Fast and Reversible Na Intercalation in Nsutite‐Type VO2 Hierarchitectures

Polypyrrole-Encapsulated Polyoxomolybdate Decorated MXene As a Functional 2D/3D Nanohybrid for a Robust and High Performance Li-Ion Battery

Vanadium carbides in shungite

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Product

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Fast and Reversible Na Intercalation in Nsutite‐Type VO₂ Hierarchitectures

Fast and Reversible Na Intercalation in Nsutite‐Type VO₂ Hierarchitectures