Structural and electrochemical studies of PPy/PEG-LiFePO4 cathode material for Li-ion batteries

Fedorková, Andrea Straková; Nacher-Alejos, Ana; Gómez‐Romero, Pedro; Oriňáková, Renáta; Kaniansky, Dušan

doi:10.1016/j.electacta.2009.09.060

Cited by 75 publications

(54 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In order to enhance the electronic conductivity and electrochemical properties of LiFePO 4 cathode materials, tremendous efforts have been made, which include: (1) doping LiFePO 4 with foreign atoms [15][16][17]. Though this method can increase the conductivity to some degree [16], introducing guest atoms into the crystal lattices of LiFePO 4 may also be deleterious if it occurs on the lithium sites [18]; (2) surface coating or admixing with electronically conductive materials (carbon [19][20][21][22][23][24] and conducting polymers [25][26][27][28]) has also been studied; (iii) decreasing the particle size may also improve the ionic transport issues [29][30][31]. Reducing the particle size can significantly shorten the diffusion time of Li in LiFePO 4 , resulting in a much enhanced power performance.…”

Section: Introductionmentioning

confidence: 99%

Effects of carbon sources and carbon contents on the electrochemical properties of LiFePO4/C cathode material

Yang

Deng

Suo

2012

J Solid State Electrochem

View full text Add to dashboard Cite

LiFePO 4 /C composites are prepared by using two types of carbon source: one using polymer (PAALi) and the other using sucrose. The physical characteristics of LiFePO 4 /C composites are investigated by X-ray diffraction), scanning electron microscopy, BET, laser particle analyzer, and Raman spectroscopy. Their electrochemical properties are characterized by cyclic voltammograms, constant current charge-discharge, and electrochemical impedance spectra. These analyses indicate that the carbon source and carbon content have a great effect on the physical and electrochemical performances of LiFePO 4 /C composites. An ideal carbon source and appropriate carbon content can effectively increase the lithium-ion diffusion coefficient and exchange current density, decrease the charge transfer resistance (R ct ), and enhance the electrochemical performances of LiFePO 4 /C composite. The results show that PAALi is a better carbon source for the synthesis of LiFePO 4 /C composites. When the carbon content is 4.11 wt.% (the molar ratio of PAALi/Li 2 C 2 O 4 was 2:1), as-prepared LiFePO 4 /C composite shows the best combination between electrochemical performances and tap density.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of carbon sources and carbon contents on the electrochemical properties of LiFePO4/C cathode material

Yang

Deng

Suo

2012

J Solid State Electrochem

View full text Add to dashboard Cite

show abstract

“…(2) Surface coating or admixing with electronically conductive materials (carbon [13][14][15][16][17][18][19], Ag [20] and conducting polymers [21][22][23][24]) has also been studied. (3) Decreasing the particle size may also improve the ionic transport issues [25][26][27], because reducing the particle size can significantly shorten the diffusion time of Li + in LiFePO 4 , resulting in a much enhanced power performance.…”

Section: Introductionmentioning

confidence: 99%

Effects of molecular weight, heating rate, synthetic temperature and sintering duration on electrochemical properties of a LiFePO4/C cathode material pyrolyzed from lithium polyacrylate

Yang

Huai

et al. 2011

J Solid State Electrochem

View full text Add to dashboard Cite

A LiFePO 4 /C composite was obtained by a polymer pyrolysis reduction method, using lithium polyacrylate (LiPAA) as carbon source and fractional lithium source, and FePO 4 ·2H 2 O as iron and phosphorus source. The structure of the LiFePO 4 /C composites was investigated by X-ray diffraction (XRD). The micromorphology of the precursors and LiFePO 4 /C powders was observed using scanning electron microscopy (SEM). Laser particle analyzer and BET were also used to characterize the materials. It was found that the micromorphology, particle size distribution and specific surface area of LiFePO 4 /C composites were greatly influenced by the molecular weight of LiPAA. The electrochemical properties of the LiFePO 4 /C composites were evaluated by cyclic voltammograms (CVs), electrochemical impedance spectra (EIS) and constant current charge/discharge cycling tests. The results showed that the molecular weight of LiPAA, heating rate, synthetic temperature and sintering duration directly affected the electrochemical properties of LiFePO 4 /C composites. The sample with the optimized electrochemical properties were obtained in the following conditions, i.e., LiPAA with the molecular weight of 20,000, heating rate of 10°C min −1 , synthetic temperature of 700°C and sintering duration of 15 h.

show abstract

“…However, the conductivity is usually poor, which can be further enhanced after doping. 10,11 In most cases, PPy-based electrode materials can be synthesized by way of chemical polymerization, which generally involves the use of an insulating polymer binder, possibly lowering the electrochemical performances. [12][13][14][15] On the contrary, electrochemical polymerization can directly combine the polymer with the metal substrate and exclude the use of a polymer binder.…”

Section: Introductionmentioning

confidence: 99%

Observation on Sodium p-Toluenesulfonate Doped Polypyrrole Cathode for Sodium Ion Battery

HouHongying

LiaoQishu

DuanJixiang

et al. 2017

Surface Innovations

View full text Add to dashboard Cite

Sodium p-toluenesulfonate (TsONa)-doped polypyrrole (PPy) was synthesized as the cathode active material of sodium ion battery by way of facile one-step electrodeposition on iron (Fe) foil. The micro-morphology and micro-structure of assynthesized TsONa/PPy/iron cathode were characterized in terms of scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction; furthermore, the electrochemical Na-storage activity of TsONa/PPy/iron cathode was investigated by methods of, galvanostatic charge/discharge, cyclic voltammetry and alternating current impedance. As expected, the cauliflower-like TsONa-doped PPy particles tightly combined with the surface of the iron foil without any additional polymer binders; and also, the resultant TsONa/PPy/iron cathode delivered satisfactory electrochemical performances, mainly attributed to high Na-storage activity of PPy matrix and high electronic conductivity induced by doping of TsONa. For example, the reversible discharge capacity of TsONa/PPy/iron cathode remained about 98 mAh/g after at least 50 cycles and the corresponding coulombic efficiency was 92%, indicating high cyclic stability and reversibility of TsONa/PPy/iron cathode for sodium ion battery.

show abstract

Structural and electrochemical studies of PPy/PEG-LiFePO4 cathode material for Li-ion batteries

Cited by 75 publications

References 17 publications

Effects of carbon sources and carbon contents on the electrochemical properties of LiFePO4/C cathode material

Effects of carbon sources and carbon contents on the electrochemical properties of LiFePO4/C cathode material

Effects of molecular weight, heating rate, synthetic temperature and sintering duration on electrochemical properties of a LiFePO4/C cathode material pyrolyzed from lithium polyacrylate

Observation on Sodium p-Toluenesulfonate Doped Polypyrrole Cathode for Sodium Ion Battery

Contact Info

Product

Resources

About