Research of Lithium Ferrous Phosphate by Microwave Technique

In order to developing high-value-added products and making full use of phosphate resources, Lithium Iron Phosphate were synthesized in the controlled atmosphere, using electronic grade phosphoric acid from Yunnan province, ferrous oxalate and Lithium carbonate by microwave processing. The variety of particles and distribution in different conditions of the mixing and grinding, the influence of appearance and property of the Lithium Iron Phosphate in different conditions of microwave power, microwave time and reaction temperature were discussed. Based on the experiment the optimized process conditions have been obtained. Some of the samples were characterized by XRD, SEM, electric capacity, chemical analysis, cycle performance and phase analysis. The experimental results show that the microwave synthesis method of Lithium Ferrous Phosphate is feasible.

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Effect of Doping Ions on Electrochemical Properties of LiFePO4 Cathode

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.197-198.1135 ◽

2011 ◽

Vol 197-198 ◽

pp. 1135-1138 ◽

Cited By ~ 2

Author(s):

Yan Li Ruan

Keyword(s):

Solid State ◽

Cathode Materials ◽

Lithium Iron Phosphate ◽

Iron Phosphate ◽

Solid State Reaction Method ◽

Inert Atmosphere ◽

Cycle Performance ◽

Performance Measurements ◽

Reaction Method ◽

Large Current

Lithium iron phosphate (LiFePO4) cathode materials containing different low concentration ion dopants (Mg2+, Al3+, Zr4+, and Nb5+) were prepared by a solid-state reaction method in an inert atmosphere. The effects of the doping ions on the properties of as-synthesized cathode materials were investigated. XRD results indicate that the ion dopants do not affect the structure of the materials. The galvanostatically charge and discharge tests show that ion dopants can considerably improve the electrochemical performance of the materials, especially large current discharge behaviors. LiFePO4 samples doped with Nb5+have an initiate capacity of 146.8 mAh•g-1at 0.1C. Further cycle performance measurements reveal the sample doped with Nb5+shows the best cycleability. The results also verify that LiFePO4doped with ions of suited radius and higher valence shows better electrochemical characters.

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Study on Lithium Iron Batteries Synthesis

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.460.218 ◽

2012 ◽

Vol 460 ◽

pp. 218-221

Author(s):

Dong Mei Zhao ◽

Xue Peng Liu

Keyword(s):

Heat Treatment ◽

Particle Size ◽

Lithium Iron Phosphate ◽

Synthesis Method ◽

Iron Phosphate ◽

Treatment Temperature ◽

Material Structure ◽

Structure And Properties ◽

Tap Density ◽

Temperature Heat

The heat treatment temperature on the influence of the material structure and properties is discussed. At 710 °C the synthesis of LiFePO4 crystallization is complete, morphology, and particle size is moderate, which has the best electrochemical performance. Sphere of lithium iron phosphate is synthesized by ethylene glycol solvent under low temperature heat synthesis method, which can give a relatively high tap density of 1.6g•cm-3

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The Hydrothermal Synthesis of Lithium Iron Phosphate

MRS Proceedings ◽

10.1557/proc-0972-aa13-08 ◽

2006 ◽

Vol 972 ◽

Cited By ~ 1

Author(s):

Jiajun Chen ◽

M. Stanley Whittingham

Keyword(s):

Carbon Nanotubes ◽

Ascorbic Acid ◽

High Temperature ◽

Hydrothermal Synthesis ◽

Lithium Iron Phosphate ◽

Electronic Conductivity ◽

Synthesis Method ◽

Iron Phosphate ◽

Cell Dimensions ◽

Unit Cell Dimensions

AbstractWell-crystalline LiFePO4 particles were successfully prepared in the temperature range between 120 and 220°C, and complete ion ordering was obtained above 175°C where the unit cell dimensions were identical to high temperature material. The use of a soluble reductant, such as sugar or ascorbic acid, was found to minimize the oxidation of the iron to ferric. The electronic conductivity was enhanced by the deposition of carbon from the sugar, or by the addition of carbon nanotubes to the hydrothermal reactor when over 90% of the lithium could be de-intercalated electrochemically. We have extended the hydrothermal synthesis method to the Mn, Co and Ni analogs as well as to the mixed phosphates, such as LiMnyFe1-yPO4.

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Novel Synthesis of Plate-like LiFePO4 by Hydrothermal Method

Journal of New Materials for Electrochemical Systems ◽

10.14447/jnmes.v19i1.345 ◽

2016 ◽

Vol 19 (1) ◽

pp. 033-036 ◽

Cited By ~ 5

Author(s):

Yi-Jie Gu ◽

Chang-Jiao Li ◽

Long Cheng ◽

Peng-Gong Lv ◽

Fu-Jie Fu ◽

...

Keyword(s):

Hydrothermal Method ◽

Single Phase ◽

Lithium Iron Phosphate ◽

Ph Value ◽

Synthesis Method ◽

Particle Morphology ◽

Iron Phosphate ◽

X Ray Diffraction ◽

Ferrous Ions ◽

Iron Compounds

Lithium iron phosphate (LiFePO4) was prepared by hydrothermal synthesis method using FeSO4·7H2O and LiH2PO4 as resource of Li and Fe. The ratio of Li: Fe was maintained 1:1. The results suggested that pH value played a crucial role in the synthesis of LiFePO4, especially for the generation of impurities. We found that adding citric acid to the precursor was an effective way for chelating ferrous ions, thereby preventing the undesirable iron compounds during hydrothermal treatment. The particle morphology and the crystal orientation of the prepared LiFePO4 particles were investigated by the XRD and SEM results. The X-ray diffraction pattern of the samples indicated that single-phase LiFePO4 were successfully synthesized by hydrothermal method with a stoichiometric 1:1 ratio of Li :Fe.

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Review of Modified Nickel-Cobalt Lithium Aluminate Cathode Materials for Lithium-Ion Batteries

International Journal of Photoenergy ◽

10.1155/2019/2730849 ◽

2019 ◽

Vol 2019 ◽

pp. 1-13 ◽

Cited By ~ 3

Author(s):

Ding Wang ◽

Weihong Liu ◽

Xuhong Zhang ◽

Yue Huang ◽

Mingbiao Xu ◽

...

Keyword(s):

Cathode Materials ◽

Lithium Iron Phosphate ◽

Specific Capacity ◽

Lithium Ion ◽

Iron Phosphate ◽

Cycle Performance ◽

Future Research ◽

Lithium Aluminate ◽

Nickel Cobalt ◽

Lithium Cobaltate

Ternary nickel-cobalt lithium aluminate LiNixCoyAl1‐x‐yO2 (NCA, x≥0.8) is an essential cathode material with many vital advantages, such as lower cost and higher specific capacity compared with lithium cobaltate and lithium iron phosphate materials. However, the noticeably irreversible capacity and reduced cycle performance of NCA cathode materials have restricted their further development. To solve these problems and further improve the electrochemical performance, numerous research studies on material modification have been conducted, achieving promising results in recent years. In this work, the progress of NCA cathode materials is examined from the aspects of surface coating and bulk doping. Furthermore, future research directions for NCA cathode materials are proposed.

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