Na
 3
 V
 2
 (PO
 4
 )
 3
 @NC composite derived from polyaniline as cathode material for high‐rate and ultralong‐life sodium‐ion batteries

Zhu, Limin; Sun, Qiancheng; Xie, Lingling; Cao, Xiaoyu

doi:10.1002/er.5239

Cited by 41 publications

(14 citation statements)

References 49 publications

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“…In order to solve these problems, many researchers have developed different new materials to facilitate the deintercalation of large size sodium ions. Typical cathode materials for NIBs mainly include layered transitional metal oxides 9 and polyanion compounds, 10‐14 in which the latter exhibits better cycle stability 15 …”

Section: Introductionmentioning

confidence: 99%

Ultra‐long cycle life and high rate performance subglobose Na ₃ V ₂ ( PO ₄ ) ₂ F ₃ @C cathode and its regulation

et al. 2020

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Summary A nitrogen‐doped carbon coated subglobose Na3V2(PO4)2F3@C (NVPF) cathode for sodium‐ion batteries was synthesized by using hexadecyl trimethyl ammonium bromide (CTAB) as soft template and polyvinylidene fluoride (PVDF) as carbon source. CTAB plays a significant role on the formation of sphere micelles. Precursor ions are self‐assembled on the surface at appropriate concentration and its mechanism is investigated in subglobose NVPF@C‐4. CTAB also increases the conductivity of carbon layer as −(CH3)3N+ in CTAB is combined with residual carbon from PVDF to form partially N‐doped carbon. Meanwhile, the carbon source PVDF contributes to prevent the generation of impurity Na3V2(PO4)3 by compensating the evaporative fluorine. Generally, CTAB and PVDF play multifunctional roles in regulating Na3V2(PO4)2F3@C cathode with well‐developed crystallite, high rate performance, good conductivity, and ultra‐long cycle life. The specific capacity of NVPF@C‐4 cathode at 0.1 C and 10 C is as high as 121.5 mAh·g−1 and 99.2 mAh·g−1 with high capacity retention of 90.1% even after 1000 cycles at 10 C. The excellent rate performance is also attributed to the high diffusion coefficient of Na+ and high exchange current according to the kinetic analysis. The enhanced electrochemical performances reveal the special regulation in this paper is feasible to obtain excellent structural stability of NVPF materials.

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Section: Introductionmentioning

confidence: 99%

Ultra‐long cycle life and high rate performance subglobose Na ₃ V ₂ ( PO ₄ ) ₂ F ₃ @C cathode and its regulation

et al. 2020

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“…Because of the similar working principal of SIBs and LIBs, several families of cathode materials for SIBs have been studied based of their analog with LIBs, including polyanionic compounds, 12 layered metal oxides and Prussian blue analogs 13 . In particular, V‐based phosphates materials, such as Na 3 V 2 (PO 4 ) 3, 14‐16 NaVOPO 4 , 17,18 and NaVPO 4 F, 19 have attracted considerable attention because of their high structural stability, high working redox potentials and long‐term cycling.…”

Section: Introductionmentioning

confidence: 99%

Monoclinic α‐NaVOPO ₄ as cathode materials for sodium‐ions batteries: Experimental and DFT investigation

et al. 2020

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Summary Sodium vanadyl orthophosphate NaVOPO4 is an attractive High‐Potential cathode material for Na‐ions batteries with three polymorphs (α, β, and α1). In this work, pure phase of monoclinic α‐NaVOPO4 was synthesized by sol‐gel method and the origin of its poor electrochemical activity was investigated. Sample characterization using X‐ray diffraction, Raman spectroscopy, magnetic measurement and Fourier transform infrared (FT‐IR) spectroscopy confirm the formation of a single phase of monoclinic NaVOPO4 without any impurities. Electrochemical properties were also characterized using cyclic voltammetry, galvanostatic charge‐discharge and electrochemical impedance spectroscopy. The results indicate that α‐NaVOPO4 exhibit a good ionic conductivity but the charge transfer resistance is large. Optical analysis and DFT calculations both showed that the α‐NaVOPO4 is a semi‐conductor with a band‐gap energy of 2.24 eV which explain the origin of the high charge transfer resistance measured using EIS technique. From all these experimental and theoretical results, the poor electrochemical activity of α‐NaVOPO4 can be associated to its low intrinsic electronic conductivity. Electronic and ionic properties of the NaVOPO4 polymorphs are not yet fully characterized. Here, the monoclinic NaVOPO4 was investigated and the material exhibits a high voltage, a good ionic conductivity and good stability, but it exhibits a poor performance. The EIS, optical, and DFT result explain the origin of such behavior. A detailed magnetic study was also reported in this paper.

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“…Li‐ion batteries have been exhibiting extremely attractive advantages in large‐scale energy storage fields, but limited reserves of Lithium and its uneven distribution on earth impede their practical application 1,2 . This situation triggers the exploration of new energy storage battery systems, in which Na‐ion and K‐ion batteries are expected to present competitive performance with low cost and rich reserves 3,4 . These battery systems receive growing attention for their potential applications in large‐scale energy storage fields.…”

Section: Introductionmentioning

confidence: 99%

Confining FeS in graphitized carbon with void space for high and stable electrochemical storage performance of Na ⁺ and K ⁺

Wang

Cao

et al. 2020

Int J Energy Res

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Summary Ferrous sulfides have high theoretical capacity in the electrochemical storage of Na‐ion and K‐ion, but its obvious volume change during the storage process greatly affects its cycling performance at high current density. In this regard, we construct a unique composites structure of Nitrogen‐doped carbon shell coated FeS nanoparticle with inner void spaces. As an anode in Na‐ion and K‐ion batteries, this structure could provide excellent cycling performance at high rate of charge/discharge process (560 mAh/g at 0.5 A/g for 300 cycles in Na‐ion battery and 322 mAh/g at 1 A/g for 300 cycles in K‐ion battery). Further research finds the inner void space could not only provide buffer space for the volume change of FeS nanoparticles, but also maintain a stable outer carbon shell during the electrochemical process. These behaviors greatly promote the reversibility of FeS at high rate charge transfer process. Consequently, the construction of inner void space in graphitized carbon shell in this work could be considered as an important reference for the promotion of electrochemical storage in other transitional metal compound system.

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Na ₃ V ₂ (PO ₄ ) ₃ @NC composite derived from polyaniline as cathode material for high‐rate and ultralong‐life sodium‐ion batteries

Cited by 41 publications

References 49 publications

Ultra‐long cycle life and high rate performance subglobose Na ₃ V ₂ ( PO ₄ ) ₂ F ₃ @C cathode and its regulation

Ultra‐long cycle life and high rate performance subglobose Na ₃ V ₂ ( PO ₄ ) ₂ F ₃ @C cathode and its regulation

Monoclinic α‐NaVOPO ₄ as cathode materials for sodium‐ions batteries: Experimental and DFT investigation

Confining FeS in graphitized carbon with void space for high and stable electrochemical storage performance of Na ⁺ and K ⁺

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Na 3 V 2 (PO 4 ) 3 @NC composite derived from polyaniline as cathode material for high‐rate and ultralong‐life sodium‐ion batteries

Cited by 41 publications

References 49 publications

Ultra‐long cycle life and high rate performance subglobose Na 3 V 2 ( PO 4 ) 2 F 3 @C cathode and its regulation

Ultra‐long cycle life and high rate performance subglobose Na 3 V 2 ( PO 4 ) 2 F 3 @C cathode and its regulation

Monoclinic α‐NaVOPO 4 as cathode materials for sodium‐ions batteries: Experimental and DFT investigation

Confining FeS in graphitized carbon with void space for high and stable electrochemical storage performance of Na + and K +

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Product

Resources

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Na ₃ V ₂ (PO ₄ ) ₃ @NC composite derived from polyaniline as cathode material for high‐rate and ultralong‐life sodium‐ion batteries

Ultra‐long cycle life and high rate performance subglobose Na ₃ V ₂ ( PO ₄ ) ₂ F ₃ @C cathode and its regulation

Ultra‐long cycle life and high rate performance subglobose Na ₃ V ₂ ( PO ₄ ) ₂ F ₃ @C cathode and its regulation

Monoclinic α‐NaVOPO ₄ as cathode materials for sodium‐ions batteries: Experimental and DFT investigation

Confining FeS in graphitized carbon with void space for high and stable electrochemical storage performance of Na ⁺ and K ⁺