Electrochemical properties of LiFePO4 prepared via hydrothermal route

Dokko, Kaoru; Koizumi, Shohei; Sharaishi, Keisuke; Kanamura, Kiyoshi

doi:10.1016/j.jpowsour.2006.10.027

Cited by 108 publications

(74 citation statements)

References 21 publications

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“…At a quite high rate of 1 C, the C/LFP-130 electrode can still give a high capacity of ~135 mAh g 1 , while the C/LFP-180 electrode shows a higher capacity of ~140 mAh g 1 , which is about 87% of their theoretical capacity. These discharge capacities are almost the same as those reported from the highly active LiFePO 4 nanoparticles but much higher than those commonly reported LiFePO 4 nanopowders [21,22]. Figure 5(c) shows the cycling performances of the C/LFP-130 and C/LFP-180 samples.…”

Section: Structure Characterizationssupporting

confidence: 78%

“…Generally, it is now well accepted that downsizing to nanometer scale can effectively increase the electrochemical utilization of the LiFePO 4 particles, while carbon-coating can greatly help to enhance the rate capability of the material. To combine the advantages of nanosized electrode materials and conductive modification of the surface phase, various synthetic approaches, such as solid state methods [17], sol-gel routes [18,19], and hydrothermal/ solvothermal synthesis [20][21][22][23], have been employed to develop nanocomposite C/LiFePO 4 particles with controlled morphologies [3][4][5]7]. From electrochemical point of view, microspherical LiFePO 4 particles are better suitable for lithium battery applications because of their larger packing density and better fluidity for electrode manufacture [24,25].…”

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confidence: 99%

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Low temperature hydrothermal synthesis and electrochemical performances of LiFePO4 microspheres as a cathode material for lithium-ion batteries

2012

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Mesoporous LiFePO 4 microspheres were simply synthesized by a low temperature (130C), template-free hydrothermal route using low cost LiOH, Fe(NO 3 ) 3 and NH 4 H 2 PO 4 as starting raw materials. These microspheres are composed of densely aggregated LiFePO 4 nanoparticles and filled with interconnected mesochannels, which demonstrates not only a high tap density (1.4 g cm 3 ), a high capacity of 150 mAh g 1 (~90% of its theoretical capacity) at 0.5 C rate, but also a  80% utilization of its theoretical capacity at a high rate of 1 C. In addition, the hydrothermal synthesis developed in this work is simple and cost-effective, it may provide a new route for production of the LiFePO 4 material in battery applications.

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Section: Structure Characterizationssupporting

confidence: 78%

mentioning

confidence: 99%

Low temperature hydrothermal synthesis and electrochemical performances of LiFePO4 microspheres as a cathode material for lithium-ion batteries

2012

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“…37 Strengite and phosphosiderite can be synthesized by either acid reflux or boiling 17,43 or at hydrothermal conditions. 44 The main industrial application of hydrated iron phosphates is their use as cathodes in Li batteries, [45][46][47][48] while giniite is used as a potential dehydrogenation catalytic material. Despite this past work, our understanding of the nucleation, growth, and transformation of Al and Fe phosphate minerals is still fragmented.…”

Section: Introductionmentioning

confidence: 99%

Precipitation of Iron and Aluminum Phosphates Directly from Aqueous Solution as a Function of Temperature from 50 to 200 °C

Roncal-Herrero

Rodríguez-Blanco

Benning

et al. 2009

Crystal Growth & Design

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ABSTRACT:The nucleation and crystallization of Al and Fe phosphate phases directly from aqueous solutions were investigated experimentally in batch reactors at 50 to 200°C and pH 1.6. The mineralogy, elemental composition, and morphology of the formed solids were characterized by X-ray diffraction, spectroscopy, and high-resolution microscopic techniques. The corresponding dissolved aqueous Al, Fe, and P concentrations were analyzed by spectroscopic and chromatographic techniques. In all experiments Al and Fe phosphate phases readily precipitate from supersaturated solutions. Precipitation is initiated by the nucleation and growth of amorphous Al or Fe phosphate precursors. These crystallize at T = 100°C to either variscite and metavariscite or strengite and phosphosiderite, respectively. At T g 150°C, these Al and Fe amorphous phases recrystallize to either berlinite or ferric giniite, respectively. The composition of the aqueous solution in all cases evolves rapidly to near saturation with respect to variscite and strengite. These observations suggest that Al and Fe phosphates may be critical to limiting aqueous phosphate availability in many natural environments.

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“…We have succeeded in detection of even small amount of impurity on LiFePO4 synthesized by the hydrothermal process by using a mean of the Raman spectrocopy. 14) All of the Raman peaks ( Fig. 1(b)) were attributed to LiMnPO4, indicating pure LiMnPO4 was synthesized successfully.…”

Section: Bare Limnpo4 Synthesized By Hydrothermal Processmentioning

confidence: 86%

Effect of carbon source on electrochemical performance of carbon coated LiMnPO4 cathode

Mizuno

Kotobuki

Munakata

et al. 2009

J. Ceram. Soc. Japan

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Source materials for carbon coating on LiMnPO4 were examined to improve an electrochemical performance of LiMnPO4. Lascorbic acid, sucrose, polyethylene oxide (PEO), and carboxymethyl cellulose (CMC) were used as carbon sources for hydrothermal synthesis of carbon coated LiMnPO4. Disordered (D) and graphite-like (G) carbons were detected by Raman spectroscopy for the prepared samples except for PEO-used one, and the highest G/D ratio was obtained for the sample prepared using CMC as carbon source. The electrochemical performance of the samples was evaluated by galvanostatic charge/discharge test. The carbon coated LiMnPO4 prepared with CMC carbon source showed the highest discharge capacity, 94 mA h g -1 at 0.01 C (corresponding to 55% of the theoretical capacity, 171 mA h g -1 ), indicating that the carbon sources greatly influenced on the electrochemical performance of the carbon coated LiMnPO4 prepared by the hydrothermal synthesis.

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Electrochemical properties of LiFePO4 prepared via hydrothermal route

Cited by 108 publications

References 21 publications

Low temperature hydrothermal synthesis and electrochemical performances of LiFePO4 microspheres as a cathode material for lithium-ion batteries

Low temperature hydrothermal synthesis and electrochemical performances of LiFePO4 microspheres as a cathode material for lithium-ion batteries

Precipitation of Iron and Aluminum Phosphates Directly from Aqueous Solution as a Function of Temperature from 50 to 200 °C

Effect of carbon source on electrochemical performance of carbon coated LiMnPO4 cathode

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