Synthesis and Characterization of LiFePO4-C/ PANI Composite for Cathode Material of Lithium Ion Battery

2012 ◽  
Vol 585 ◽  
pp. 240-244 ◽  
Author(s):  
Rajeev Sehrawat ◽  
Anjan Sil
Keyword(s):  
Composite Material ◽  
In Situ Polymerization ◽  
Active Material ◽  
Lithium Ion ◽  
Chain Structure ◽  
Raw Material ◽  
Precipitation Method ◽  
Gravimetric Analysis ◽  
Oxidizing Agents

In-situ polymer coated LiFePO4-C composite material has been synthesized using different oxidizing agents viz. (NH4)2S2O8, KMnO4 and K2Cr2O7. Polyaniline (PANI) with chains having diameter ≤ 200 nm have been grown separately by self oxidation process of aniline monomers using the above oxidizing agents. For the synthesis of LiFePO4-C active material, initially raw material FePO4/PANI has been synthesized by chemical precipitation method and added with LiCOOCH3 followed by heat treatment at 700°C under reducing (Ar/H2=90/10) atmosphere for 16 hrs. The synthesized LiFePO4-C material has particle size of about 100 nm. The polymer coated LiFePO4-C composite was synthesized by undergoing in-situ polymerization of aniline monomers added with fixed quantity of LiFePO4-C. XRD analysis reveals formation of single phase pure active material LiFePO4-C and mixed phase containing LiFePO4 to FePO4 for polymer coated LiFePO4-C composite. The carbon content in the LiFePO4-C was estimated to be 5 wt%, however, the PANI content in the composites was different with different oxidizing agent. These PANI contents in the composites synthesized with (NH4)2S2O8, KMnO4 and K2Cr2O7 are 14, 15 and 17 wt% respectively which have been estimated by thermal gravimetric analysis (TGA) of the materials. Electrical conductivities of the composite materials were determined by Impedance spectroscopy method. The composite material synthesized with (NH4)2S2O8 has higher conductivity compared to those synthesized with KMnO4 and K2Cr2O7. The higher conductivity of the composite synthesized with (NH4)2S2O8 may be attributed to the presence of partial chain structure in polymer coating as seen by microstructural observations on the composite.

scholarly journals The Effect of the Parameters of T-RTM on the Properties of Polyamide 6 Prepared by in Situ Polymerization

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 4 ◽  
Author(s):  
Orsolya Viktória Semperger ◽  
András Suplicz
Keyword(s):  
Mechanical Properties ◽  
Automotive Industry ◽  
Cycle Time ◽  
In Situ Polymerization ◽  
Rapid Development ◽  
Polyamide 6 ◽  
Raw Material ◽  
Short Cycle ◽  
Short Cycle Time

With the rapid development of the automotive industry, there is also a significant need to improve the raw materials used. Therefore, the demand is increasing for polymer composites with a focus on mass reduction and recyclability. Thermoplastic polymers are preferred because of their recyclability. As the automotive industry requires mass production, they require a thermoplastic raw material that can impregnate the reinforcement in a short cycle time. The most suitable monomer for this purpose is caprolactam. It can be most efficiently processed with T-RTM (thermoplastic resin transfer molding) technology, during which polyamide 6 is produced from the low-viscosity monomer by anionic ring-opening (in situ) polymerization in a tempered mold with a sufficiently short cycle time. Manufacturing parameters, such as polymerization time and mold temperature, highly influence the morphological and mechanical properties of the product. In this paper, the properties of polyamide 6 produced by T-RTM are analyzed as a function of the production parameters. We determine the crystallinity and the residual monomer content of the samples and their effect on mechanical properties.

Improved performance in micron-sized silicon anodes by in situ polymerization of acrylic acid-based slurry

2016 ◽  
Vol 4 (43) ◽  
pp. 16982-16991 ◽  
Author(s):  
Chao Li ◽  
Tongfei Shi ◽  
Hideya Yoshitake ◽  
Hongyu Wang
Keyword(s):  
In Situ Polymerization ◽  
High Capacity ◽  
Lithium Ion ◽  
Silicon Anodes ◽  
Key Factor ◽  
Polymeric Binders ◽  
Si Anodes ◽  
Improved Performance ◽  
Silicon Particles

The interactions between silicon particles and polymeric binders are a key factor during the course of manufacturing high-capacity Si anodes for lithium-ion batteries.

scholarly journals In situ inorganic conductive network formation in high-voltage single-crystal Ni-rich cathodes

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xinming Fan ◽  
Xing Ou ◽  
Wengao Zhao ◽  
Yun Liu ◽  
Bao Zhang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Network Formation ◽  
Nickel Content ◽  
Active Material ◽  
Rate Capability ◽  
Lithium Ion ◽  
Conductive Network ◽  
Mechanical Instability ◽  
Metal Anode

AbstractHigh nickel content in LiNixCoyMnzO2 (NCM, x ≥ 0.8, x + y + z = 1) layered cathode material allows high specific energy density in lithium-ion batteries (LIBs). However, Ni-rich NCM cathodes suffer from performance degradation, mechanical and structural instability upon prolonged cell cycling. Although the use of single-crystal Ni-rich NCM can mitigate these drawbacks, the ion-diffusion in large single-crystal particles hamper its rate capability. Herein, we report a strategy to construct an in situ Li1.4Y0.4Ti1.6(PO4)3 (LYTP) ion/electron conductive network which interconnects single-crystal LiNi0.88Co0.09Mn0.03O2 (SC-NCM88) particles. The LYTP network facilitates the lithium-ion transport between SC-NCM88 particles, mitigates mechanical instability and prevents detrimental crystalline phase transformation. When used in combination with a Li metal anode, the LYTP-containing SC-NCM88-based cathode enables a coin cell capacity of 130 mAh g−1 after 500 cycles at 5 C rate in the 2.75-4.4 V range at 25 °C. Tests in Li-ion pouch cell configuration (i.e., graphite used as negative electrode active material) demonstrate capacity retention of 85% after 1000 cycles at 0.5 C in the 2.75-4.4 V range at 25 °C for the LYTP-containing SC-NCM88-based positive electrode.

Synthesis and Characterization of Caged Phosphate Microparticles Coated with Melamine Resin Based on Composite Properties of Materials

2012 ◽  
Vol 583 ◽  
pp. 236-239
Author(s):  
Xiao Min Fang ◽  
Yuan Qing Xu ◽  
Tao Ding
Keyword(s):  
Flame Retardants ◽  
In Situ Polymerization ◽  
Core Material ◽  
Gravimetric Analysis ◽  
Melamine Resin ◽  
Flame Retarded ◽  
Properties Of Materials ◽  
Loading Amount

In order to develop efficient “three in one” intumesent flame retardants, a novel caged bicyclic phosphate, tris(1-oxo-2,6,7-trioxa-1-phosphorbicyclo[2.2.2]octane methylene-4)phosphate (trimer) as the core material was encapsulated by melamine resin and etherified melamine resin as nitrogen resource respectively via in situ polymerization. The two microencapsulations were characterized by SEM, XPS and thermal gravimetric analysis. When they were used as intumesent flame retardant in epoxy they all exhibit good properties. With 20wt% loading amount the flame-retarded epoxy all can pass UL94 V-0 rating.

Preparation and Properties of Oxidized Coal/Polyaniline Composite Material

2011 ◽  
Vol 306-307 ◽  
pp. 220-223
Author(s):  
Xiao Ping Fan ◽  
An Ning Zhou
Keyword(s):  
Composite Material ◽  
In Situ Polymerization ◽  
Polymer Network ◽  
Interpenetrating Polymer Network ◽  
Hydroxyl Groups ◽  
Oxidized Coal ◽  
Pani Composite ◽  
Maximum Conductivity ◽  
Hydrolysis Of

Semi-interpenetrating polymer network of coal/polyaniline (PANI) composite material were prepared by in situ polymerization. Raw coal was oxidized in different conditions by H2O2 and HNO3, respectively. The total acidic groups analysis, Fourier transform infrared (FTIR) spectrum, and conductivity test of the raw coal and the oxidized coal/PANI composite material were conducted. The results showed that the increases of the carboxyl groups and the hydroxyl groups were mainly attributed to the hydrolysis of the weak ether link and the transform from the carboxylate to carboxylic acid. These increases were benefit to the reaction of coal and PANI, and consequently enhanced the conductivity of the composite material. The maximum conductivity of oxidized coal/PANI reached 4.72×10‑1 S/cm.

Synthesis and Characterisation of Novel Chitosan-Hydroxyapatites Composites Doped with Zinc

2017 ◽  
Vol 264 ◽  
pp. 74-78
Author(s):  
Ismaila Abdullahi ◽  
I. Zainol
Keyword(s):  
Composite Material ◽  
Crystallite Size ◽  
Lattice Constant ◽  
Bone Mineral ◽  
Morphological Features ◽  
Precipitation Method ◽  
The Novel ◽  
Novel Material ◽  
Co Precipitation

The synthesis of a novelzinc doped chitosan-hydroxyapatite (chitosan-HAp) composite was done viain situ co-precipitation method. FTIR results showed that zinc is incorporated into the composite formed and is less crystalline compared to the pure hydroxyapatite (HAp). XRD results obtained showed that the incorporation of zinc into the lattice of the chitosan-HAp led to changes in the crystallinity, crystallite size and lattice constant of the composite material. FESEM images of the samples revealed that the novel material has a morphological features that resemble that of bone mineral.

scholarly journals In situ polymerization of polypyrrole on cotton fabrics as flexible electrothermal materials

2019 ◽  
Vol 14 ◽  
pp. 155892501982744 ◽  
Author(s):  
Juan Xie ◽  
Wei Pan ◽  
Zheng Guo ◽  
Shan Shan Jiao ◽  
Ling Ping Yang
Keyword(s):  
Thermal Stability ◽  
Tensile Strength ◽  
In Situ Polymerization ◽  
Thermo Gravimetric Analysis ◽  
Cotton Fabrics ◽  
Morphological Properties ◽  
Polymerization Process ◽  
Maximum Temperature ◽  
Gravimetric Analysis

Polypyrrole/cotton composites have substantial application potential in flexible heating devices due to their flexibility, high conductivity, and thermal stability. In this context, a series of flexible polypyrrole/cotton fabrics were intrinsically prepared using in situ polymerization process with the different Py/FeCl3 concentration ratios. To investigate their structural and morphological properties, thermal stability, tensile strength, conductivity, and heat-generating property, the composite fabrics were subjected to Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, thermo-gravimetric analysis, mechanical properties, and resistivity measurements. The results showed that polypyrrole/cotton fabrics exhibited a low resistivity of 0.37 Ω cm. Temperature–time curve showed that temperature of the polypyrrole/cotton fabrics increased very quickly from room temperature to a steady-state maximum temperature of 168.3°C within 3 min at applied voltage of 5 V. Tensile strength of polypyrrole/cotton composites reached to 58 MPa, which far surpassed raw cotton fabrics. Therefore, polypyrrole/cotton fabrics have exhibited high electrical, thermal properties, and mechanical strength, which can be utilized as an ideal flexible heating element.

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