Construction of E-pH diagram and experimental study on wet synthesis of FePO4 as the precursor of cathode materials

The preparation of FePO4 as a precursor by co-precipitation method is widely used, Due to the lack of the guidance of thermodynamic theory, The prepared FePO4 often contains impurity phase, which leads to unsatisfactory performance of LiFeO4. The E-pH diagram of Fe-P-H2O system at the temperature of 25℃ were drawn through the basic E-pH principle with a number of thermodynamic data. According to the E-pH Diagram, the pH value is approximately 2.5, and the FePO4 with less impurity can be prepared by adding proper oxidant. Base on the above mentioned condition, a simple verification experiment was carried out. The results showed that the prepared iron FePO4 had fewer impurities, which provided a theoretical basis for preparing high-performance LiFeO4.

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Effects of Feed Rate and pH Value on the Physical and Electrochemical Properties of LiNi0.4Co0.2Mn0.4O2 Cathode Material for Lithiumion Battery

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.989-994.462 ◽

2014 ◽

Vol 989-994 ◽

pp. 462-466

Author(s):

Fang Du ◽

Liang Fu Peng

Keyword(s):

Cathode Material ◽

Electrochemical Properties ◽

Cathode Materials ◽

Feed Rate ◽

Ph Value ◽

Structural Features ◽

Precipitation Method ◽

Precipitation Reaction ◽

Voltage Range ◽

Co Precipitation

The layered LiNi0.4Co0.2Mn0.4O2was synthesized by co-precipitation method using carbonate sodium as precipitant. The microscopic structural features and morphologies of as-prepared cathode materials were investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). And then, the charge-discharge measurements were carried out to determine the electrochemical properties in a voltage range of 2.5-4.6 V. The results show that the pH value in the process of co-precipitation reaction plays a greater part on the electrochemical properties than feed rate does. The cathode materials prepared at higher pH value illustrate better electrochemical properties in the voltage range of 2.5-4.6 V, which can be attributed to a less cation mixing in the cathode material as well as the smaller primary particles and the smaller second particles.

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Synthesis of F-doped LiFePO4/C cathode materials for high performance lithium-ion batteries using co-precipitation method with hydrofluoric acid source

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2017.08.149 ◽

2017 ◽

Vol 727 ◽

pp. 501-513 ◽

Cited By ~ 13

Author(s):

Chao Gao ◽

Jian Zhou ◽

Guizhen Liu ◽

Lin Wang

Keyword(s):

Lithium Ion Batteries ◽

Cathode Materials ◽

Hydrofluoric Acid ◽

High Performance ◽

Lithium Ion ◽

Precipitation Method ◽

Co Precipitation

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Nanostructured potassium and sodium ion incorporated Prussian blue frameworks as cathode materials for sodium-ion batteries

Chemical Communications ◽

10.1039/c7cc02303k ◽

2017 ◽

Vol 53 (40) ◽

pp. 5569-5572 ◽

Cited By ~ 54

Author(s):

Yang Liu ◽

Dandan He ◽

Ruimin Han ◽

Gangya Wei ◽

Yun Qiao

Keyword(s):

Prussian Blue ◽

Cathode Materials ◽

Sodium Ion ◽

Precipitation Method ◽

Sodium Ion Batteries ◽

Co Precipitation

Nanostructured KxNayMnFe(CN)6 (x + y ≤ 2) has been synthesized via a facile co-precipitation method.

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Novel Fe3O4/HNT@rGO composite via a facile co-precipitation method for the removal of contaminants from aqueous system

RSC Advances ◽

10.1039/c6ra01279e ◽

2016 ◽

Vol 6 (54) ◽

pp. 49228-49235 ◽

Cited By ~ 10

Author(s):

Chengwei Gao ◽

Baojun Li ◽

Ning Chen ◽

Jie Ding ◽

Qiang Cai ◽

...

Keyword(s):

Heat Treatment ◽

Water Treatment ◽

Potential Application ◽

High Performance ◽

Aqueous System ◽

Precipitation Method ◽

Precipitation Process ◽

System P ◽

Removal Of Contaminants ◽

Co Precipitation

Fe3O4/HNT@rGO composite (FHGC) was fabricated via a facile co-precipitation process, followed by heat treatment. For RhB and As5+removal, the high performance and easy separation of FHGC highlight its potential application in water treatment.

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Synthesis of Lithium and Manganese-Rich Cathode Materials via an Oxalate Co-Precipitation Method

Journal of The Electrochemical Society ◽

10.1149/2.016305jes ◽

2013 ◽

Vol 160 (5) ◽

pp. A3108-A3112 ◽

Cited By ~ 32

Author(s):

Dapeng Wang ◽

Ilias Belharouak ◽

Guangwen Zhou ◽

Khalil Amine

Keyword(s):

Cathode Materials ◽

Precipitation Method ◽

Co Precipitation

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Enhanced electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode materials by ultrasonic-assisted co-precipitation method

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2015.04.173 ◽

2015 ◽

Vol 644 ◽

pp. 607-614 ◽

Cited By ~ 20

Author(s):

Xiaobo Zheng ◽

Xinhai Li ◽

Zhenjun Huang ◽

Bao Zhang ◽

Zhixing Wang ◽

...

Keyword(s):

Electrochemical Performance ◽

Cathode Materials ◽

Precipitation Method ◽

Ultrasonic Assisted ◽

Co Precipitation ◽

Enhanced Electrochemical Performance

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Catalytic Hydrolysis of Hydrogen Cyanide on Cu-Al Catalyst

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1094.15 ◽

2015 ◽

Vol 1094 ◽

pp. 15-19

Author(s):

Lin Xia Yan ◽

Sen Lin Tian ◽

Qiu Lin Zhang

Keyword(s):

Calcination Temperature ◽

Hydrogen Cyanide ◽

Influence Factor ◽

Ph Value ◽

Precipitation Method ◽

Molar Ratio ◽

Cu Content ◽

Co Precipitation ◽

The Impact ◽

Hydrolysis Of

Cu-Al catalysts were synthesized by the co-precipitation method to study hydrolysis of hydrogen cyanide. During the synthesis, the impact of Cu/Al molar ratio, pH value and calcination temperature was investigated and the best synthesis condition was found. The results indicate that the remove of hydrogen cyanide first increases and then decreases with increasing Cu/Al molar ratio, pH value and calcination temperature, which reaches the maxima and remains above 95% at 360 min when Cu/Al molar ratio is 2:1, pH value is approximately 8.0 and calcination temperature is 400°C around. The analysis of X-ray diffraction (XRD) shows that Cu content is the main influence factor at Cu/Al molar ratio below 2:1 whereas crystallinity of catalysts is the key factor at Cu/Al molar ratio above 2:1.

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Sonochemical Synthesis of Silica Coated Super Paramagnetic Iron Oxide Nanoparticles

Materials Science Forum ◽

10.4028/www.scientific.net/msf.756.74 ◽

2013 ◽

Vol 756 ◽

pp. 74-79 ◽

Cited By ~ 13

Author(s):

Bashiru Kayode Sodipo ◽

Azlan Abdul Aziz

Keyword(s):

Iron Oxide ◽

Silica Nanoparticles ◽

Iron Oxide Nanoparticles ◽

Ph Value ◽

Superparamagnetic Iron Oxide ◽

Silica Nanoparticle ◽

Precipitation Method ◽

Oxide Nanoparticles ◽

Sonochemical Method ◽

Co Precipitation

Superparamagnetic iron oxide nanoparticles (SPION) of sizes 5 to10 nm were synthesized by the co-precipitation method. They are coated with silica nanoparticles using sonication method. The SPION was produced under the optimum pH of 10, peptized in acidic medium and redispersed in water. The silica nanoparticles were produced through the Stöbermethod. Sonochemical coating of silica nanoparticle on the SPION was successfulat a pH value lower than 5. Otherwise, at higher pH value (but lower than point zero charge (PZC)), the SPION were found to be unstable. Fast hydrolysis of triethoxyvinylsilane(TEVS) shows that silica forms its own particles without coating onto the surfaces of the SPION. Under optimized experimental condition, sonochemical method of coating silica nanoparticles onto the SPION can be considered as an alternative for effective and prompt method that rely mainly on pH of the suspension.

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