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Dive into the research topics where Kenza Maher is active.

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Featured researches published by Kenza Maher.


Lithium-Ion Batteries Advances and Applications | 2014

Thermodynamics of Lithium-Ion Batteries

Rachid Yazami; Kenza Maher

Abstract Li-ion batteries (LiB) of coin-cell form factor (2032) were subjected to three different accelerate aging modes; i. overcharge ageing up to 4.9 V end of charge cut-off voltages (COV), ii. thermal aging at 60 °C and 70 °C for a period of up to 8 weeks after being charged to 4.2 V at ambient temperatures , and iii. long cycling at a C/2 rate at ambient temperature for up to 1000 cycles. We found the entropy (ΔS) and enthalpy (ΔH) profiles varied with aging conditions much more readily than open-circuit potential (OCP) profiles. We also found that aged batteries keep a thermodynamic fingerprint of the process by which they aged. This memory effect can be revealed by measuring the entropy and enthalpy of aged cells at two particular OCP of 3.87 V and OCP = 3.94 V, which are specific to LiB based on graphite anode and lithiated cobalt oxide (LCO) cathode material. In fact 3.87 V and 3.94 V are potentials of phase transition in the anode and cathode materials, respectively. Another aspect of the thermodynamics memory effect is a characteristic change of entropy and enthalpy profiles of cells having incurred the same capacity loss under different aging modes as compared to almost identical OCP and discharge profiles.


Archive | 2017

Quality Decision for Overcharged Li-Ion Battery from Reliability and Safety Perspective

Feng Leng; Cher Ming Tan; Rachid Yazami; Kenza Maher; Robert Wang

During charging of Lithium-ion battery (LiB), the charging cutoff voltage (COV) may exceed the manufacturers’ specification because of incorrect monitoring of the charging control circuit, either due to the aging of the control circuit or the design/manufacturing errors of the control circuit. In fact, it is found that overcharging LiB cell is a common abuse. This work shows the effect of excessive COV on cell’s discharging ability, and the use of a novel nondestructive method to evaluate if the damage made in the cell by the excessive COV is rendering the cell from further safe usage or it is still acceptable with minor degradation in reliability and safety, thus providing a basis for quality consideration of the cell. The method also enables battery manufacturers to identify the internal components for their cells that are most vulnerable to the excessive COV so that quality improvement of their batteries can be designed and produced. This method also alerts electric vehicles user on the hidden safety issues of their battery pack, and enables battery management system to perform reliability balancing, a new patented technique to ensure the safe and reliable operation of battery pack.


Journal of Power Sources | 2014

A study of lithium ion batteries cycle aging by thermodynamics techniques

Kenza Maher; Rachid Yazami


Journal of Power Sources | 2010

On the LiNi0.2Mn0.2Co0.6O2 positive electrode material

Yassine Bentaleb; Ismael Saadoune; Kenza Maher; Latifa Saadi; Kenjiro Fujimoto; Shigeru Ito


Journal of Power Sources | 2011

The electrochemical behaviour of the carbon-coated Ni0.5TiOPO4 electrode material

Kenza Maher; Kristina Edström; Ismael Saadoune; Torbjörn Gustafsson; Mohammed Mansori


Electrochimica Acta | 2013

Effect of overcharge on entropy and enthalpy of lithium-ion batteries

Kenza Maher; Rachid Yazami


Electrochimica Acta | 2009

Synthesis and characterization of carbon-coated Li0.5Ni0.25TiOPO4 anode material

Kenza Maher; Kristina Edström; Ismael Saadoune; Torbjörn Gustafsson; Mohammed Mansori


Journal of Power Sources | 2014

A thermodynamic and crystal structure study of thermally aged lithium ion cells

Kenza Maher; Rachid Yazami


Solid State Ionics | 2012

Electrochemical lithium ion intercalation in Li0.5Ni0.25TiOPO4 examined by in situ X-ray diffraction

Rickard Eriksson; Kenza Maher; Ismael Saadoune; Mohammed Mansori; Torbjörn Gustafsson; Kristina Edström


Archive | 2012

DEVICES FOR TESTING A BATTERY AND METHODS FOR TESTING A BATTERY

Rachid Yazami; Kenza Maher

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Rachid Yazami

Nanyang Technological University

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Kenjiro Fujimoto

National Institute for Materials Science

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Shigeru Ito

Tokyo University of Science

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Feng Leng

Nanyang Technological University

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Robert Wang

Nanyang Technological University

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