Artificially coated NaFePO4 for aqueous rechargeable sodium-ion batteries

Jeong, Seonghun; Kim, Byung Hoon; Park, Yeong Don; Lee, Chang Yeon; Mun, Junyoung; Tron, Artur

doi:10.1016/j.jallcom.2019.01.046

Cited by 41 publications

(24 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Further treatment to transform the maricite form into amorphous NaFePO4 provides electrochemical activity within 1.5-4.5 V (Xiong et al, 2019). However, the potential window is above the potential window of aqueous SIB, which is in the range of -0.5-0.85 V (vs. Ag/AgCl) in 1 M aqueous NaClO4 solution (Jeong et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Iron-based phosphates have been investigated as SIB cathodes, such as in the molecular forms of Na2FeP2O7 (Kim et al, 2013), Na2FePO4F (Ellis et al, 2007), Na4Fe3(PO4)2(P2O7) (Kim et al, 2012), NaFePO4 (Kim et al, 2015), non-crystalline iron phosphate, FePO4 (Liu et al, 2012), composites of amorphous FePO4 nanospheres and carbon (Fang et al, 2014), and composites of FePO4 nanospheres and graphene (Fan et al, 2014). Even though amorphous FePO4 is easy to synthesize, olivine NaFePO4 is preferable, especially for recently studied aqueous SIBs that require electrode materials to have operating potentials within the electrochemical stability window of water, in which H2 and O2 evolution should not occur (Jeong et al, 2019). The potential window should be between -0.83 V and 1.23 V vs. SHE at 25 o C and 1 atm (Castellan, 1983).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preparation of a NaFePO4 Cathode Material via Electrochemical Sodiation of FePO4 Layers on Al Substrates

Rahmawati¹,

Romadhona²,

Paramita³

et al. 2022

IJTech

View full text Add to dashboard Cite

In this research, a cyclic voltammetry (CV) method was applied to intercalate Na + into an FePO4/Al substrate to produce NaFePO4/Al as a potential cathode material. The sodiation was conducted directly to FePO4 instead of applying delithiation to LiFePO4 followed by sodiation, as was done in previous research. CV was conducted within a potential window of 2.0-4.0 V using a scan rate of 0.05 mVs -1 . The result was compared to LiFePO4/Al treated with a similar method. The various scan rate was then applied to understand its effect on the electrochemical activity recorded in the voltammogram and its impedance profile. The results show that the CV product of FePO4/Al (NFP(A)) was crystallized in an orthorhombic olivine NaFePO4, as a result of Le Bail refinement. Orthorhombic Na0.7FePO4, trigonal FePO4, and monoclinic FePO4 were presented as secondary phases. Meanwhile, the CV product of LiFePO4/Al (NFP(B)) was also crystallized in olivine NaFePO4 and possessed secondary phases similar to NFP(A) with an additional Fe2O3 phase. NFP(A) showed two significant peaks at 2.442 V and 3.534 V, confirming sodiation/de-sodiation and Fe 3+ /Fe 2+ activity, respectively. Meanwhile, NFP(B) showed two peaks at 3.183 V and 3.04 V, corresponding to de-lithiation and sodiation, respectively. The Nyquist plots of both materials show a similar profile, with the impedance value of NFP(A) being lower than that of NFP(B). This confirms that the CV treatment of FePO4/Al is more facile than the treatment of the LiFePO4 layer, while also producing a cathode with higher electrical conductivity. Scan rate reduction to 0.04 mVs -1 produced a much lower impedance value, confirming higher electrical conductivity.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation of a NaFePO4 Cathode Material via Electrochemical Sodiation of FePO4 Layers on Al Substrates

Rahmawati¹,

Romadhona²,

Paramita³

et al. 2022

IJTech

View full text Add to dashboard Cite

show abstract

“…[11,12] As one promissing Na + containing material, NaFePO 4 has shown high voltage, [13] high stability and large theoretical capacity. [14][15][16] Therefore, many NaFePO 4 /CC electrodes have been designed, which display fascinating performances. [17] To overcome the leakage of liquid electrolyte, another research focus in flexible supercapacitors is drawn towards the development of solid state electrolyte, [18,19] and the polymeric electrolytes such as polyvinyl alcohol (PVA), polyethylene oxide (PEO)-polyethylene glycol (PEG), polymethyl methacrylate (PMMA)-ethylene carbonate (EC)-propylene carbonate (PC) etc.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the proposal of coating electroactive materials on CC substrate is usually adopted [11,12] . As one promissing Na + containing material, NaFePO 4 has shown high voltage, [13] high stability and large theoretical capacity [14–16] . Therefore, many NaFePO 4 /CC electrodes have been designed, which display fascinating performances [17] …”

Section: Introductionmentioning

confidence: 99%

A Flexible Asymmetric NaFePO₄/Carbon Cloth Supercapacitor Using Crosslinked Polyacrylate Gel as Electrolyte

et al. 2021

View full text Add to dashboard Cite

With the development of light-weight and bendable electric devices, nowdays, solid-state supercapacitive devices have attracted great attention, in which the classic polymeric electrolytes such as polyvinyl alcohol and polyethylene oxide copolymers are generally used. However, the microphase separation in these polymers and low conductivity affect the ions transfer and the energy-storage performance. In this work, a crosslinked sodium polyacrylate gel (NaPA) is synthesized to replace conventional polymeric electrolyte. Because NaPA is a kind of polymeric salt which has high native degree of ionization in water, the NaPA gel shows low resistance to ion transportation. By using NaPA gel as the electrolyte and carbon cloth as current collector, a flexible solid asymmetric super-capacitor assembled by positive NaFePO 4 /carbon cloth and negative activated carbon/carbon cloth electrode shows the maximum capacitance of 46.33 mF cm À 2 at 1 mA cm À 2 , with a high stability of 87.33 % retention during 5000 charge and discharge cycles. Moreover, this flexible asymmetric supercapacitors showed nearly unchanged capacitance under different bending angles. It is found that the Na + diffusion coefficient in NaFePO 4 /CC//NaPA supercapacitor is 8.05 × 10 À 14 cm 2 ⋅ s, remarkable higher than CC//NaPA and NaFePO 4 / CC//PVA. The high diffusion coefficient and low resistance of NaPA lead to excellent capacitave performance of NaFePO 4 / CC//NaPA, delivering a good application prospect.

show abstract

“…Nowadays, NaIBs are in full swing. Typically used anode materials are inorganic based giving limited recycling strategies [1,2]. Comparable with inorganic electrodes, organic electrodes are conferred with various superiority.…”

Section: Introductionmentioning

confidence: 99%

Organic Electrode Material for Sodium-Ion Batteries

2020

Materials Research Foundations

View full text Add to dashboard Cite

A lot of work is done on functionalizing organic electrodes (OE) and incorporation of nanostructures to tune their electrochemical properties. In collation, OE exhibit merits like high capacity and structural design ability. Here in, organic electrodes based on their reactions are divided into three classes; C=O, C-N=O and doping reactions. The conductivity issue can be resolved through increasing conjugation. Theoretical capacity can be elevated by expanding active groups. Working voltage can be regulated by tuning grafting overseeing lowest unoccupied molecular orbital (LUMO). Future of organic electrode relies mainly on aprotic electrolyte based full NaIBs with long cycle life.

show abstract

Artificially coated NaFePO4 for aqueous rechargeable sodium-ion batteries

Cited by 41 publications

References 48 publications

Preparation of a NaFePO4 Cathode Material via Electrochemical Sodiation of FePO4 Layers on Al Substrates

Preparation of a NaFePO4 Cathode Material via Electrochemical Sodiation of FePO4 Layers on Al Substrates

A Flexible Asymmetric NaFePO₄/Carbon Cloth Supercapacitor Using Crosslinked Polyacrylate Gel as Electrolyte

Organic Electrode Material for Sodium-Ion Batteries

Contact Info

Product

Resources

About

Artificially coated NaFePO4 for aqueous rechargeable sodium-ion batteries

Cited by 41 publications

References 48 publications

Preparation of a NaFePO4 Cathode Material via Electrochemical Sodiation of FePO4 Layers on Al Substrates

Preparation of a NaFePO4 Cathode Material via Electrochemical Sodiation of FePO4 Layers on Al Substrates

A Flexible Asymmetric NaFePO4/Carbon Cloth Supercapacitor Using Crosslinked Polyacrylate Gel as Electrolyte

Organic Electrode Material for Sodium-Ion Batteries

Contact Info

Product

Resources

About

A Flexible Asymmetric NaFePO₄/Carbon Cloth Supercapacitor Using Crosslinked Polyacrylate Gel as Electrolyte