Syed Atif Pervez

Helmholtz-Institute Ulm

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Edward P.L. Roberts

University of Calgary

Milana Trifkovic

University of Calgary

Badrul Mohamed Jan

University of Malaya

Gabriele Kloker

Helmholtz-Institute Ulm

Mohsin Saleem

National University of Sciences and Technology

Rani Bushra

Nanjing Forestry University

Waqas Ahmad

Khyber Teaching Hospital

Adnan Maqbool

University of Engineering and Technology Lahore

Masud Rana

University of Queensland

Umer Farooq

Pakistan Agricultural Research Council

Cooperative Institutions

Korea Electrotechnology Research Institute

Changwon National University

Government of the Republic of Korea

University of Malaya

Helmholtz-Institute Ulm

University of Calgary

Calgary Laboratory Services

Khwaja Fareed University of Engineering and Information Technology

University of Crete

Korea University of Science and Technology

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Recent Advancements of N-Doped Graphene for Rechargeable Batteries: A Review

Crystals (2020)

Rabia Ikram Badrul Mohamed Jan Syed Atif Pervez Vassilis Papadakis Waqas Ahmad

Graphene, a 2D carbon structure, due to its unique materials characteristics for energy storage applications has grasped the considerable attention of scientists. The highlighted properties of this material with a mechanically robust and highly conductive nature have opened new opportunities for different energy storage systems such as Li-S (lithium-sulfur), Li-ion batteries, and metal-air batteries. It is necessary to understand the intrinsic properties of graphene materials to widen its large-scale applications in energy storage systems. In this review, different routes of graphene synthesis were investigated using chemical, thermal, plasma, and other methods along with their advantages and disadvantages. Apart from this, the applications of N-doped graphene in energy storage devices were discussed.

Carbon fibers

10.3390/cryst10121080

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Citations (24)

Revealing of Core Shell Effect on Frequency-Dependent Properties of Bi-based Relaxor/Ferroelectric Ceramic Composites

Scientific Reports (2018)

Mohsin Saleem Lim Dong Hwan Insung Kim Min‐Soo Kim Adnan Maqbool

In this study, electromechanical characteristics of (1-x) Bi0.5Na0.5TiO3-xSrTiO3 (ST26, x = 0.26)/(1-y) Bi0.5Na0.5TiO3-ySrTiO3 (ST10, y = 0.1) (matrix/seed) composites were studied. The ST26 (high relaxor phase) and ST10 (a relaxor ferroelectric (RF), high ferroelectric phase) composite with large (r-ST26-ST10) and small (t-ST26-ST10) grains exhibited frequency-related dielectric properties and large strain response at a low triggering electric field (an incipient piezoelectricity). It is ascribed to a matrix-seed effect originating from the inhomogeneous composition due to the presence of two phases. The r-ST26-ST10 composite sintered at 4 h, prominent material, showed a high normalized dynamic strain (d33*) of ~700 pm/V (large grains) with stable frequency dependence properties at a low field of 40 kV/cm. The properties of the r-ST26-ST10 composite exhibit less decay with frequency-related polarization and strain compared to those of t-ST26-ST10 composite. The increase in soaking time promotes the diffusion and homogenization of the microstructure in composites, leading to changes in the core-shell structure in the solid solution. The polarization and strain of the ST26-ST10 composites with the frequency are linked to the stability of the internal random fields created by non-ergodic relaxor phase of seed and the amount of phase change in the ergodic relaxor matrix.

Homogenization

10.1038/s41598-018-32133-7

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Pressure‐ and Temperature‐Dependent Interface Kinetics in Na ₃ Zr ₂ Si ₂ PO ₁₂ ‐Based All‐Solid‐State Na Metal Battery

Energy Technology (2022)

Syed Atif Pervez Edward P.L. Roberts Milana Trifkovic

A new strategy for the stable operation of high energy, solid-state Na batteries by operating Na symmetric cells at elevated pressures is demonstrated. Enhanced interface kinetics are achieved at a stack pressure of 100 MPa and temperature of 50°C, evident by lowering the voltage polarization of the cells by 10 times. More details can be found in article number 2200658, Milana Trifkovic and co-workers.

10.1002/ente.202270113

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Improving the Electrochemical Properties of Advanced Cross-Linked Solid Polymer Composite Electrolytes

ACS Applied Energy Materials (2022)

Gabriele Kloker Syed Atif Pervez Alexander Hoefling Maximilian Fichtner

Solid-state batteries based on composite polymer electrolytes (CPEs) have shown enormous potential for safe and high-energy-storage systems. The current work is focused on the study of a CPE based on cross-linked poly(ethylene glycol) (PEG) polymer and Li7La3Zr2O12 (LLZO) inorganic solid electrolyte. Nano- and micrometer-sized particles of LLZO were embedded in a cross-linked polymer that was synthesized via a solvent-free ring-opening polymerization technique. CPEs with nanosized LLZO were superior to the pure polymer or CPEs containing microsized particles. Different weight ratios of the nanosized LLZO in the polymer matrix influenced the electrochemical performance of the cells. CPE with 5 wt % LLZO showed significantly improved Li stripping/plating behavior. In contrast to the pure polymer electrolytes, where the voltage polarizations drastically increased after only 27 h of testing, nano-LLZO-5 wt %-CPE maintained stable voltage profiles at 0.05 mA cm2 for over 200 h. Furthermore, the addition of 5 wt % nano-LLZO yielded a wider electrochemical stability window (an increase of ∼1 V), higher transference number (tLi+ increased by 0.1), and about 4 times higher limiting current density than those recorded for the pure polymer. Such enhancements in the performance suggest a favorable role of nanosized LLZO in a composite polymer electrolyte system.

10.1021/acsaem.2c02082

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Citations (6)

Pressure‐ and Temperature‐Dependent Interface Kinetics in Na₃Zr₂Si₂PO₁₂‐Based All‐Solid‐State Na Metal Battery

Energy Technology (2022)

Syed Atif Pervez Edward P.L. Roberts Milana Trifkovic

Ceramic Na superionic conductor (NASICON)‐type Na 3 Zr 2 Si 2 PO 12 solid‐state electrolyte is one of the prime candidates for Na metal solid‐state batteries due to its high room‐temperature ionic conductivity and electrochemical stability. However, a major challenge lies in integration of NASICONs with a Na anode due to the solid‐solid nature of the interface. Herein, the ductility of Na metal is capitalized and the impact of stack pressure and temperature in improving the interfacial properties of Na|NASICON symmetric cells is investigated. At 100 MPa stack pressure and 50 °C, the voltage polarization of the cells is approximately 10 times lower than those tested at 25 °C. The improved Na + ‐ion kinetics result in a higher critical current density and a stable Na cycling response over long durations. Postmortem studies confirm the presence of Na dendrites in the pores and along the grain boundary of the NASICON ceramic structure. The results demonstrate the dependence of interface kinetics on pressure and temperature in a Na 3 Zr 2 Si 2 PO 12 ‐based all‐solid state Na metal battery and presents a strategy for enabling stable operation of high‐energy, solid‐state Na batteries.

Fast ion conductor

10.1002/ente.202200658

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Citations (2)