Improvement of electrochemical performances of LiFePO4 cathode materials by coating of polythiophene

Bai, Yongmei; Qiu, Peng; Wen, Zhongliu; Han, Shaochang

doi:10.1016/j.jallcom.2010.05.173

Cited by 53 publications

(18 citation statements)

References 28 publications

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“…Recently, inherently conducting polymers such as polyacetylene (PA), polypyrrole (PPy), polyaniline (PANI) and polythiophene (PTH) are deeply investigated for their good conductivity and light in weight [5][6][7][8]. Up to the present, several groups have done much work on synthesizing electromagnetic PPy-based nanocomposites [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Preparation and microwave absorbing properties of nickel-coated graphite nanosheet with pyrrole via in situ polymerization

Yang¹,

Qi²,

Wang

2012

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Preparation and microwave absorbing properties of nickel-coated graphite nanosheet with pyrrole via in situ polymerization

Yang¹,

Qi²,

Wang

2012

Journal of Alloys and Compounds

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“…It yields a very low electronic conductivity, a property essential for battery design. But this property has been greatly improved through the successful application of conductive coatings or cation doping making it comparable with other cathode materials [8,17,18]. In addition to these attributes, the constituent materials are abundant and widely available at a relatively inexpensive price making LiFePO 4 extremely attractive for high-power vehicle, military and space flight operations [4,20] along with everyday consumer electronics.…”

Section: Lifepo 4 Selection and Performance Characteristicsmentioning

confidence: 99%

Mixed Modes Fracture and Fatigue Evaluation for Lithium-Ion Batteries

Stamps

Huang

2012

Volume 8: Mechanics of Solids, Structures and Fluids

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Lithium ion batteries have become a widely known commodity for satisfying the world’s mobile energy storage needs. But these needs are becoming increasingly important, especially in the transportation industry, as concern for rising oil prices and environmental impact from fossil fuels are pushing for deployment of more electric vehicles (EV) or plug in hybrid-electric vehicles (PHEV) and renewable energy sources. The objective of this research is to obtain a fundamental understanding of degradation mechanisms and rate-capacity loss in lithium-ion batteries through fracture mechanics and fatigue analysis approaches. In this study we follow empirical observations that mechanical stresses accumulate on electrode materials during the cycling process. Crack induced fracturing will then follow in the material which electrical contact surface area is degraded and over capacitance of the battery reduces. A fatigue analysis simulation is applied using ANSYS finite element software coupled with analytical models to alleviate these parameters that play the most pivotal roles in affecting the rate-capacity and cycle life of the lithium-ion battery. Our results have potential to provide new models and simulation tools for clarifying the interplay of structure mechanics and electrochemistry while offering an increased understanding of fatigue degradation mechanisms in rechargeable battery materials. These models can aid manufacturers in the optimization of battery materials to ensure longer electrochemical cycling life with high-rate capacity for improved consumer electronics, electric vehicles, and many other military or space applications.

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“…10,11 In particular for LiFePO 4 , composites with polyaniline, 12,13 polypyrrole 14,15 and polythiophene 16,17 derivatives have been prepared by blending LFP with chemically synthesized polymers or by chemical or electrochemical polymerization in the presence of the phosphate. These polymers can be utilized for the design of composite electrodes in order to increase the conductivity without penalizing the electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

Judicious design of lithium iron phosphate electrodes using poly(3,4-ethylenedioxythiophene) for high performance batteries

Cíntora-Juárez¹,

Vicente²,

Kazim

et al. 2015

J. Mater. Chem. A

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LiFePO 4 electrodes were built in different architectures using a poly(3,4-ethylenedioxythiophene)polystyrene sulfonate (PEDOT:PSS) mixed conductor as an additive. Conductivity enhancement of PEDOT:PSS was achieved by the addition of ethylene glycol and dimethyl sulfoxide solvents. The amounts of conducting polymer and solvent additives strongly influence the discharge capacity and potential of LiFePO 4 electrodes at high rates. The initial impedance and the direct current resistance were correlated with the discharge performance at high rates. The optimized amount of PEDOT:PSS added within the bulk resulted in a lower value of impedance, lower load resistance and higher capacity as compared to the standard preparation. Furthermore 57 Fe Mössbauer spectroscopy and X-ray photoelectron spectroscopy were employed to probe the bulk transformation of the LiFePO 4 active material and the surface changes of the composite electrodes with the conducting polymer upon lithiation. The electrode with PEDOT:PSS coated on the aluminium current collector and doped with ethylene glycol showed highly competitive performance (132 mA h g À1 at 5 C and 145 mA h g À1 at 2 C for 50 cycles). ; Tel: +34 955404890 † Electronic supplementary information (ESI) available: Fitted parameters for Mössbauer spectra and for XPS Fe(2p) and S(2p) spectra. See

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Improvement of electrochemical performances of LiFePO4 cathode materials by coating of polythiophene

Cited by 53 publications

References 28 publications

Preparation and microwave absorbing properties of nickel-coated graphite nanosheet with pyrrole via in situ polymerization

Preparation and microwave absorbing properties of nickel-coated graphite nanosheet with pyrrole via in situ polymerization

Mixed Modes Fracture and Fatigue Evaluation for Lithium-Ion Batteries

Judicious design of lithium iron phosphate electrodes using poly(3,4-ethylenedioxythiophene) for high performance batteries

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