Praneash Venkatachalam

Bio: Praneash Venkatachalam is an academic researcher from SRM University. The author has contributed to research in topics: Electrode & Lithium-ion battery. The author has an hindex of 1, co-authored 3 publications receiving 4 citations.

Critical Insights Into Fast Charging Techniques for Lithium-Ion Batteries in Electric Vehicles

Abstract: The objective of this article is to illustrate the various fast charging techniques that are being used to charge the lithium-ion batteries in electric vehicles. Various charging protocols such as constant current, constant voltage, constant current constant voltage, multistage constant current, varying current method, pulse charging methods are critically reviewed and explained in their broader perspective of fundamental concepts to their modeling/simulation. Amongst, the constant current constant voltage charging approach is considered as a benchmark for other charging protocols in terms of the charging time, the charging efficiency, and battery life. A critical comparison among the various charging methods mentioned above are discussed and possible future research directions in the design and development of new fast charging techniques have been proposed based on the commercial and societal demands.

Self-assembled mesoporous Nb2O5 as a high performance anode material for rechargeable lithium ion batteries

Abstract: Self-assembled mesoporous Nb2O5 has been successfully synthesized by template free one-pot method followed by annealation treatment. The morphological and textural characterization with field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), and N2 sorption analyses reveal the formation of interconnected mesoporous Nb2O5 with pores average size ~5 nm without using any templates or porogens. When used as anode material in lithium ion battery (LIB), the mesostructured Nb2O5 material exhibits enhanced electrochemical performance with discharge capacity of 182 mA h g−1 (against theoretical capacity of 200 mA h g−1) even after 210 cycles at 0.5 C rate with columbic efficiency ~99.0%. At 1 C rate, Nb2O5 constructed electrode shows high electrode stability up to 850 cycles of repeated charge/discharges. The impressive capacity retention and the rate capability of porous Nb2O5 are attributed to the (i) interconnected porous structure providing favourable electrode/electrolyte interface as well as Li insertion/extraction kinetics and (ii) operation of combined intercalative and capacitive charge storage mechanism.

The doctor blade

Abstract: A doctor blade for wiping printing ink off a surface of a printing plate, comprising a flat and elongated main body having a working edge region configured in a longitudinal direction, the working edge region being covered with a first coating on the basis of a nickel-phosphorus alloy applied by electroless deposition, and hard material particles being dispersed in the first coating, characterized in that the first coating is covered with a second coating on the basis of galvanically deposited nickel.

Precisely Tunable T-Nb2O5 Nanotubes via Atomic Layer Deposition for Fast-Charging Lithium-Ion Batteries.

Abstract: The demand for fast-charging of lithium-ion batteries (LIBs) in modern electric transportation and wearable electronics is rapidly growing. However, commercially available graphite anodes still suffer from slow kinetics of lithium-ion diffusion and severe safety concerns of lithium plating when achieving the fast-charging goal. Here, it is demonstrated that the Li-ion diffusion kinetics of orthorhombic Nb2O5 nanotubes (T-Nb2O5 NTs) is enhanced by atomically precise manufacturing of nanoarchitectures. The controlled fabrication of T-Nb2O5 NTs with wall thicknesses from 24 to 43 nm is realized via atomic layer deposition (ALD) using electrospun polyacrylonitrile nanofibers as a sacrificing template. The wall thickness of T-Nb2O5 NTs can be precisely tuned by adjusting the number of ALD cycles. The relationship between the wall thicknesses and electrochemical performances is investigated in detail. The electrochemical kinetic analysis suggests that the lithium storage in T-Nb2O5 NTs is dominated by surface and intercalation pseudocapacitance. The morphology of T-Nb2O5 crystallites is found to have significant effects on the Li-ion insertion/extraction kinetics and the performance of the electrodes in LIBs. The resulting T-Nb2O5 NTs exhibit fast charge-storage kinetics and enable highly reversible insertion/extraction of Li ions without a phase change. This work may open up a new avenue for further development of intercalation-pseudocapacitive nanostructured materials for high-rate and ultrastable energy-storage devices.

A Review of Various Fast Charging Power and Thermal Protocols for Electric Vehicles Represented by Lithium-Ion Battery Systems

Abstract: Despite fast technological advances, the worldwide adoption of electric vehicles (EVs) is still hampered mainly by charging time, efficiency, and lifespan. Lithium-ion batteries have become the primary source for EVs because of their high energy density and long lifetime. Currently, several methods intend to determine the health of lithium-ion batteries fast-charging protocols. Filling a gap in the literature, a clear classification of charging protocols is presented and investigated here. This paper categorizes fast-charging protocols into the power management protocol, which depends on a controllable current, voltage, and cell temperature, and the material aspects charging protocol, which is based on material physical modification and chemical structures of the lithium-ion battery. In addition, each of the charging protocols is further subdivided into more detailed methodologies and aspects. A full evaluation and comparison of the latest studies is proposed according to the underlying parameterization effort, the battery cell used, efficiency, cycle life, charging time, and increase in surface temperature of the battery. The pros and cons of each protocol are scrutinized to reveal possible research tracks concerning EV fast-charging protocols.