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"Sharma, A."
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A glimpse on all-solid-state Li-ion battery (ASSLIB) performance based on novel solid polymer electrolytes: a topical review
All-solid-state batteries are swiftly gaining the attention of the research community owing to their widespread applications in electric vehicles, digital electronics, portable appliances, etc. A battery comprises three components: cathode, anode and electrolyte. An electrolyte is the heart of the battery and plays a crucial role in the overall performance of the battery. In order to make the review more focused, all-solid-state Li-ion batteries (ASSLIBs) have been considered. This review covers the architecture of ASSLIBs, advantages, and characteristics of the solid polymer electrolytes. The important preparation methods are summarized, followed by the characterizations for testing the suitability of electrolytes for solid-state batteries. The discussion is focused on the ‘state of the art’ in the field of solid-state batteries, device fabrication, and comparison in terms of capacity, energy density, and cyclic stability. In the last section, the ion conduction mechanism in different solid polymer electrolytes is discussed. Finally, it is tried to give a possible outlook for developing future hybrid and multifunctional electrolytes which can act as a bridge for developing solid-state batteries covering a broad range of applications.
Journal Article
Soft computing techniques in connected healthcare systems
\"This book provides examination of applications of soft computing techniques related to healthcare systems and can be used as a reference guide for assessing the roles that various techniques, such as machine learning, fuzzy logic, and statistical mathematics, play in the advancements of smart healthcare systems. This book is intended for under graduate, and graduate students, researchers and practicing professionals in the field of connected healthcare. It provides an overview for beginners while also addressing professionals in the industry on the importance of soft computing approaches in connected healthcare systems\"-- Provided by publisher.
Book
Dielectric relaxations and transport properties parameter analysis of novel blended solid polymer electrolyte for sodium-ion rechargeable batteries
A novel blended solid polymer electrolyte comprising polyethylene oxide and polyvinylpyrrolidone polymers for blending and sodium nitrate (NaNO3) as ion conducting species has been optimized via standard solution-cast technique. XRD, FESEM, and FTIR were performed to obtain the information about the structural changes, morphology, and microstructural changes (polymer–ion and ion–ion interactions) of the solid polymer electrolyte films. The electrochemical impedance spectroscopy, linear sweep voltammetry, and i–t characteristics were performed to evaluate the ionic conductivity, voltage stability window, and ion transference number. The impedance study was done in a broad temperature range (40–100 °C). The DSC and TGA were used to obtain information about the thermal transitions and thermal stability of prepared films. The ion dynamics is further investigated by analyzing the complex permittivity, loss tangent, and complex conductivity. All the plots were fitted through established theoretical model/expressions in whole frequency window to obtain dielectric strength, ion conduction path behavior, and relaxation time. Transport parameters such as number density (n), mobility (μ), and diffusion coefficient (D) of mobile ions were obtained by three methods and compared satisfactorily. Lastly, a coherent mechanism for the migration of charge transport carriers within the solid polymer composites has been proposed based on the performed experimental outcome.
Journal Article
الراهب الذي باع سيارته الفيراري : قصة خيالية حول تحقيق أحلامك وبلوغ مصيرك
هذا الكتاب \"الراهب الذى باع سيارته الفيراري\" قصة تتحدث عن جوليان مانتل المحامى اللامع الذى أدى أسلوب معيشته المفتقر للتوازن إلى إصابته بأزمة قلبية كادت أن تؤدى بحياته فى أحدى قاعات المحاكم المزدحمة بالجمهور ويقضى انهياره الجسدي إلى أزمة روحانية تجبره على مواجهة حالته والبحث عن أجوبة شافية لأهم الأسئلة الحياتية وعلى أمل منه أن يعثر على السعادة والرضا فقد انطلق فى رحلة عجيبة شبيهة بالأوديسا إلى حضارة عتيقة فماذا وجد هذا ما سنعرفه من خلال هذه القصة الرائعة.
Book
Early genetic code is explained by preferential amplification of enantiomeric excess of amino acids and nucleosides
At an early stage of evolution only four amino acids (Gly, Asp, Val, Ala) were encoded by the genetic code (GCo). Using ternary phase diagrams, we show that among racemic compound amino acids, solution enantiomeric excess (ee) of Asp, Val and Ala would be amplified preferentially by \"self-disproportionation of enantiomers (SDE)\" in a scalemic sample and thus become homochiral before others. For any seed solution-ee of a racemic compound amino acid, an equation is derived for minimum required threshold supersaturation for this ee to be amplified to its eutectic value. The supersaturation threshold is lowest for Asp, Val and Ala, resulting in amplification of their ee before other amino acids, a reason for their early incorporation in GCo that has hitherto been overlooked. The ee amplification factor is a linearly increasing function of (C0/CE), the ratio of equilibrium racemic concentration (C0) and that at the eutectic point (CE). This ratio is 0.96, 0.89, 0.80, 0.62, 0.58, 0.41, 0.13 for Asp, Val, Ala, Pro, Ile, Leu, Ser respectively. Similar reasoning is used to show that among the four nucleosides that make the backbone of the GCo, solution-ee of guanosine (G) was preferentially amplified before other three and could explain why GGN is a RNA codon for Gly, the achiral amino acid that was probably the first to be encoded by the GCo.
Journal Article
القائد الذي لم يكن له منصب : حكاية عصرية من النجاح الحقيقي في العمل والحياة
في كتاب القائد الذي لم يكن له منصب، ستتعلم : كيف تعمل مع الأشخاص وتؤثر فيهم مثل نجم متألق بغض النظر عن منصبك. طريقة لإدراك ثم انتهاز الفرص في أوقات التغيير العميق. الأسرار الحقيقية للابتكار المكثف. استراتيجية فورية لبناء فريق عظيم ولكي تصبح \"تاجرا للروعة مع عملائك. أساليب حادة\" لكي تصبح قويا ذهنيا وصليا جسديا بما يكفي حتى تقود مجالك. طرقا حقيقية للتغلب على التوتر وبناء عقلية غير قابلة للهزيمة، وتحرير الطاقة وتحقيق التوازن في حياتك الشخصية.
Book
Effect of salt concentration on dielectric properties of Li-ion conducting blend polymer electrolytes
In the present article, we have studied the effect of the salt concentration (LiPF
6
) on transport properties and ion dynamics of blend solid polymer electrolyte (PEO–PAN) prepared by solution cast technique. Fourier transform infrared (FTIR) spectroscopy confirms the presence of microscopic interactions such as polymer–ion and ion–ion interaction evidenced by a change in peak area of anion stretching mode. The fraction of free anions and ion pairs obtained from the analysis of FTIR implies that both influence the ionic conductivity with different salt concentration. The complex dielectric permittivity, dielectric loss, complex conductivity have been analyzed and fitted in the entire frequency range (1 Hz–1 MHz) at room temperature. The addition of salt augments the enhancement of dielectric constant and shift of relaxation peak in loss tangent plot toward high frequency indicates a decrease of relaxation time. We have implemented the Sigma representation (σ″ vs. σ′) for solid lithium ion conducting films which provide better insight regarding the dispersion region in Cole–Cole plot (ε″ vs. ε′) in lower frequency window. The dielectric strength, relaxation time and hopping frequency are in correlation with the conductivity which reveals the authenticity of results. Finally, the ion transport mechanism was proposed for getting the better understanding of the ion migration in the polymer matrix.
Journal Article
Polymer electrolytes for lithium ion batteries: a critical study
Polymer electrolytes (PEs) are an essential component being used in most energy storage/conversion devices. The present review article on a brief history, advantage, and their brief application of polymer electrolyte systems. It consists of a glimpse on liquid, gel, and solid polymer electrolyte and a contrast comparison concerning benefits/disadvantages among the three. The article started with a brief introduction of polymer electrolytes followed by their varieties and extreme uses. The role of host polymer matrix by taking numerous examples of polymer electrolyte published by the different renowned group of the concerned field has been explored. The criteria for selection of appropriate host polymer, salt, inorganic filler/clay, and aprotic solvents to be used in polymer electrolyte have been discussed in detail. The mostly used polymer, salt, solvents, and inorganic filler/clay list has been prepared in order to keep the data bank at one place for new researchers. This article comprises different methodologies for the preparation of polymer electrolyte films. The different self-proposed mechanisms (like VTF, WLF, free volume theory, dispersed/intercalated mechanisms, etc.) have been discussed in order to explain the lithium ion conduction in polymer electrolyte systems. A numerous characterization techniques and their resulting analysis have been summarized from the different published reports at one place for better awareness of the scientific community/reader of the area.
Journal Article