Improved electrochemical performance of La0.7Sr0.3MnO3 and carbon co-coated LiFePO4 synthesized by freeze-drying process

Cui, Yan; Zhao, Xiaoli; Guo, Ruisong

doi:10.1016/j.electacta.2009.08.020

Cited by 206 publications

(70 citation statements)

References 24 publications

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“…8 (Re represents the ohmic resistance, Rct represents the charge transfer resistance, Z w represents the Warburg resistance, and C d represents the double layer capacitance) with EC-lab software to obtain the Re and Rct. Equation 3 [31] was used to calculate the conductivity values (σ), where t is the thickness of the working electrode (250μm) and A is the area of the electrode surface (∼1.77 cm 2 ).…”

Section: Resultsmentioning

confidence: 99%

Cobalt oxide microtubes with balsam pear-shaped outer surfaces as anode material for lithium ion batteries

Yang

Wang

Liu

et al. 2015

Ionics

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Co 3 O 4 microtubes with balsam pear-shaped outer surfaces and void spaces were synthesized by the Kirkendall effect. Intermediate phase Li 1.47 Co 3 O 4 was detected by X-ray diffraction (XRD) to illustrate the severe volume change during electrode reactions and detail the conversion of Co 3 O 4 to Li 2 O and Co. Changes in and influences on Li 2 O and Co during the first cycle were explored through calculations based on electrochemical impedance spectroscopy (EIS) tests to obtain a better understanding of the electrode reaction processes. The void spaces in the tube walls accommodated the volume change during electrode reactions, and the balsam pear-shaped outer surfaces expanded the available active surface for electrode reactions. As a result, the prepared Co 3 O 4 microtubes exhibited strong electrochemical performance. The first discharge capacity reached ∼907 mAh g −1 at 5.00 mA cm −2 , and discharge capacity remained above 400 mAh g −1 until the 40th cycle at 0.05 mA cm −2 .

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Section: Resultsmentioning

confidence: 99%

Cobalt oxide microtubes with balsam pear-shaped outer surfaces as anode material for lithium ion batteries

Yang

Wang

Liu

et al. 2015

Ionics

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“…In addition, the diffusion coefficient values of the lithium ions (DLi) [28] and conductivity values (σ) [29] can be determined from Equations (1) and (2), respectively. Figure 5a displays the Nyquist plots for all samples.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Properties for Co-Doped Pyrite with High Conductivity

Liu

Wang

2015

Energies

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Abstract:In this paper, the hydrothermal method was adopted to synthesize nanostructure Co-doped pyrite (FeS2). The structural properties and morphology of the synthesized materials were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Co in the crystal lattice of FeS2 could change the growth rate of different crystal planes of the crystal particles, which resulted in various polyhedrons with clear faces and sharp outlines. In addition, the electrochemical performance of the doping pyrite in Li/FeS2 batteries was evaluated using the galvanostatic discharge test, cyclic voltammetry and electrochemical impedance spectroscopy. The results showed that the discharge capacity of the doped material (801.8 mAh·g) with a doping ratio of 7% was significantly higher than that of the original FeS2 (574.6 mAh·g −1 ) because of the enhanced conductivity. Therefore, the doping method is potentially effective for improving the electrochemical performance of FeS2.

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“…The Warburg coefficient σ ω can be obtained from the slope of these plots. 42 The diffusion coefficient (D) can be obtained from Equation 3,…”

Section: Resultsmentioning

confidence: 99%

Layered Na₂Ti₂O₄(OH)₂and K₂Ti₂O₄(OH)₂Nanoarrays for Na/Li-Ion Intercalation Systems: Effect of Ion Size

Xie

Yang

2016

J. Electrochem. Soc.

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Vertically oriented Na 2 Ti 2 O 4 (OH) 2 (NTO) and K 2 Ti 2 O 4 (OH) 2 (KTO) nanoarrays on Ti foils are synthesized via one-step hydrothermal method. These titanates-based layered materials with different cations are utilized to assemble binder-free Li/Na-ion batteries (LIBs/NIBs). We experimentally find the ion size difference of K, Na and Li in electrode materials or/and electrolyte can dramatically influence the performances of LIBs/NIBs. NTO with larger volume of unit cell shows higher capacity in both NIBs (213 mA h g −1 vs. 165 mA h g −1 ) and LIBs (509 mA h g −1 vs. 288 mA h g −1 ). That is, the ion size in host materials can significantly influence the intercalation/extraction of Na and Li ions. On the other hand, Na ions with larger size and atomic mass in the electrolyte show slower charge transfer (81.5-144.9 μs vs. 0.23 μs) and ion diffusion (7.52 × 10 −10 cm 2 s −1 vs. 1.33 × 10 −9 cm 2 s −1 , Na 2 Ti 2 O 4 (OH) 2 -based cells) than that of Li ions. This work clearly demonstrates the influence of ion size, which can clarify and provide fundamental information for fabricating high energy density and long-life batteries. In addition, it demonstrates that both Na Energy conversion and storage is a key issue in daily life and industry field. The urgent need of renewable and clean energy has attracted great attention in low-cost, safety and rechargeable battery with adequate voltage, capacity and rate capacity.1 Nowadays, Li ion battery (LIB) has conquered the portable electronic market, offering the largest energy density and output voltage of all rechargeable batteries in use.2 However, the amount of storage on earth and higher cost to obtain Li has become a critical barrier to popularization and sustainable application in battery energy storage. 1,3 Due to the wide availability and low-cost of sodium, Na ion battery (NIB) is a promising alternative to LIB in the future. But sodium has a lower reducing voltage (-2.71 V vs. SHE, compared to -3.04 V) and the gravimetric capacity is lower (1165 mA h g −1 compared to 3829 mA h g −1 ) than lithium. 4 The atomic mass of Na is more than three times larger and the ionic radius of Na is 0.3 Å larger than Li. Furthermore, graphite cannot be used as an anodic insertion host for Na ions. 5,6 Hence, Na-based anodes are urgently needed for the development of NIBs.To 20 Amazingly, this anode shows Na ion storage performance is much better than that in LIBs. The authors attributed this to slower ion transfer in LIBs than in NIBs, which differs from the general knowledge on the size/atomic mass effects of Na and Li. Therefore, it is very important to investigate/clarify how the ion size in electrode materials or/and electrolyte affects the performance of NIBs/LIBs. Na 2 Ti 2 O 4 (OH) 2 (NTO) is a layered sodium titanate with the bodycentered orthorhombic crystal structure, which can be synthesized through one-step hydrothermal method.21,22 NTO is made up of TiO 6 z E-mail: hong1979@swu.edu.cn octahedral that share edges to form two dimensional sheets (Fig. S1a). 21,23...

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Improved electrochemical performance of La0.7Sr0.3MnO3 and carbon co-coated LiFePO4 synthesized by freeze-drying process

Cited by 206 publications

References 24 publications

Cobalt oxide microtubes with balsam pear-shaped outer surfaces as anode material for lithium ion batteries

Cobalt oxide microtubes with balsam pear-shaped outer surfaces as anode material for lithium ion batteries

Electrochemical Properties for Co-Doped Pyrite with High Conductivity

Layered Na₂Ti₂O₄(OH)₂and K₂Ti₂O₄(OH)₂Nanoarrays for Na/Li-Ion Intercalation Systems: Effect of Ion Size

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Improved electrochemical performance of La0.7Sr0.3MnO3 and carbon co-coated LiFePO4 synthesized by freeze-drying process

Cited by 206 publications

References 24 publications

Cobalt oxide microtubes with balsam pear-shaped outer surfaces as anode material for lithium ion batteries

Cobalt oxide microtubes with balsam pear-shaped outer surfaces as anode material for lithium ion batteries

Electrochemical Properties for Co-Doped Pyrite with High Conductivity

Layered Na2Ti2O4(OH)2and K2Ti2O4(OH)2Nanoarrays for Na/Li-Ion Intercalation Systems: Effect of Ion Size

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Product

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Layered Na₂Ti₂O₄(OH)₂and K₂Ti₂O₄(OH)₂Nanoarrays for Na/Li-Ion Intercalation Systems: Effect of Ion Size