International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Special Issue: 09 | Sep -2017
p-ISSN: 2395-0072
www.irjet.net
One Day International Seminar on Materials Science & Technology (ISMST 2017) 4th August 2017 Organized by
Department of Physics, Mother Teresa Women’s University, Kodaikanal, Tamilnadu, India
STUDIES ON SULFUR BASED TERNARY COMPOSITE CATHODE MATERIAL FOR LITHIUM SULFUR BATTERIES K.Krishnaveni, G.Radhika, R.Subadevi, M.Sivakumar* #120, Energy Materials Lab, Department of Physics, Alagappa University, Karaikudi-630 003, Tamil Nadu, India. (* Corresponding Author: susiva73@yahoo.co.in (M.Sivakumar)) --------------------------------------------------------------------***----------------------------------------------------------------------
Abstract - Unique sulfur (S) anchoring materials and
valued for its toughness, stability, low weight, low thermal conductivity, high chemical corrosion resistance, and heat resistance. PVDF is the standard binder material used in the production of composite electrodes for lithium-ion batteries. Additionally, PVDF is used because it is chemically inert over the potential range used, and does not react with the electrolyte or lithium.
the corresponding tools for subduing capacity are now required to advance the performance of Li-S batteries. In this work, carbon coated Sulfur / polymer composite was prepared by solvent less reaction. The physical characterizations of the prepared composite was investigated using XRD, RAMAN and SEM. Raman analysis specifies that D and G bands were well matched with the sulfur based ternary composite. The functional group vibration of the ternary composite was studied using FTIR. The XRD pattern reveals that the diffraction peaks of sublimed sulfur was clearly observed in the ternary composite, which is due to the limited pore volume of the carbon matrix. The prevailing study indicates that sulfur based ternary composite is a promising candidate for the cathode material mainly in Lithium Sulfur Battery.
In this work, sulfur/PVdF/Acetylene Black composite cathode material was prepared by a low temperature heat-treatment, which provided a homogeneous distribution of sulfur, PVdF and AB in the system. This technique is a simple and energy beneficial preparation method due to its processing in the non-aqueous media. The composition, structure and morphology of the prepared composite were investigated. The preparation of the obtained composite cathode material may be an effective strategy to improve the sulfur utilization and restrain the solubility of lithium polysulfides.
Key Words: ternary composite, lithium sulfur battery, sulfur/polymer composite, solvent less reaction, carbon matrix
2. EXPERIMENTAL
1. INTRODUCTION
Sublimed sulfur and PVdF was mixed with the weight ratio of 4:1. After that high porous nature of carbon source (Acetylene black) mixed with S/PVdF composite in the ratio of 7:3. The resulting mixture was heated at 155°C for 20h. Then the material was cooled to room temperature and SPA composite was obtained. Figure.1 shows the schematic diagram of SPA composite preparation.
Elemental sulfur has expected a great deal of consideration recently as a promising cathode material for lithium/sulfur (Li/S) batteries, due to its high theoretical specific capacity of 1672 mAh g-1 [1-3]. In addition, sulfur also has advantages of low cost, abundance in nature and eco friendliness [4]. However, in spite of these advantages, the commercialization of lithium sulfur batteries has a number of difficult problems to overcome. Firstly, sulfur is electrical insulating. Secondly, polysulfides, which are formed during the discharge process of the Li/S battery, are generally soluble in liquid electrolyte [5]. Tremendous efforts have been made in recent years to overcome these problems, such as forming sulfur/carbon or sulfur/conductive polymer composites [6-10]. Among them, the sulfur/ polymer composites with core-shell structure in which sulfur is the core and polymers are the shell, exhibited enhanced cyclability and rate capability [11-12]. Polyvinylidene fluoride (PVDF) is
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