Development of cathode materials for li-ion batteries by sputter deposition

Erdoğan, Erdem Erkin
The electrochemical performance of Li-ion batteries depends mostly on the cathode material. Cobalt has a huge impact on electrochemical properties and is widely used in cathode materials, but due to its toxicity and cost, recent research is focused on reducing the amount of cobalt in cathode materials. In this study, cathode active materials are produced by magnetron sputtering to obtain the optimum amount of cobalt while optimizing the electrochemical properties. Pechini sol-gel method is used to produce powders which are then used to produce sputtering targets by cold pressing and sintering. Both targets’ and deposited electrodes’ structural and morphological characterization were done by scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS). The resultant compounds are used to produce battery cathodes via magnetron sputtering. Electrochemical characterization was done by galvanostatic charge-discharge tests and cyclic voltammetry (CV) to focus on discharge capacity and discharge energy of the cathode materials.


Ni-rich LiNixMnyCozMvO2 (X>0.6) cathode material development for Li-ion batteries
Yıldırım, Mustafa Alp; Aydınol, Mehmet Kadri; Department of Metallurgical and Materials Engineering (2022-9-01)
The nickel-rich lithium nickel manganese cobalt oxide (NMC) cathode materials are the driving force of Lithium-ion batteries. Despite the high capacity and high energy they offer, their structural stability needs to be improved. The production method and element doping are among prominent research topics in the studies to increase the structural stability of the Ni-rich NMC materials. In this study, Ni-rich LiNixMnyCozO2 (x>0.6) and Ni-rich Li(NMC)1-vNbvO2 (v=0.2, 0.4, 0.8) were produced using the citric ac...
A phase-field model for chemo-mechanical induced fracture in lithium-ion battery electrode particles
MIEHE, C.; Dal, Hüsnü; SCHAENZEL, L. -M.; RAINA, A. (2016-06-01)
Capacity fade in conventional Li-ion battery systems due to chemo-mechanical degradation during charge-discharge cycles is the bottleneck in high-performance battery design. Stresses generated by diffusion-mechanical coupling in Li-ion intercalation and deintercalation cycles, accompanied by swelling and shrinking at finite strains, cause micro-cracks, which finally disturb the electrical conductivity and isolate the electrode particles. This leads to battery capacity fade. As a first attempt towards a reli...
Bahtiyar, Doruk; Aydınol, Mehmet Kadri; Department of Metallurgical and Materials Engineering (2022-9)
For many years, materials in the form of metal sulfides, oxides, phosphates, and titanates have been developed as cathode and anode active materials to be used in energy storage devices. Borides and borates, recently, attracted the attention of researchers in this field. In this study, for the development of a new class of materials for energy storage applications, synthesis and characterization of metal (Fe, Mo, Mn, and V) borides and (Mn, and Y)borates were carried out. The obtained materials were tested ...
The electrochemical stability of lithium metal oxides against metalreduction
Ceder, Gerbrand; Aydınol, Mehmet Kadri (1998-06-01)
The possibility of metal reduction during the charging of secondary lithium batteries with LixMO2 cathodes is investigated. Loss of active material due to metal reduction can be one of the causes of capacity decay in these batteries after repeated charging. First principles methods are used to calculate the metal reduction potentials in layered LixMO2 compounds where M = Ti, V, Mn, Fe, Co or Ni. It is found that, for several of these compositions, the metal ions may preferably reduce before the lithium ion ...
Synthesis of Graphene-MoS2 composite based anode from oxides and their electrochemical behavior
Sarwar, Saira; Karamat, Shumaila; Saleem Bhatti, Arshad; Aydınol, Mehmet Kadri; Oral, Ahmet; Hassan, Muhammad Umair (2021-10-16)
High energy storage capacity and longer life span make rechargeable Li-ion batteries the first choice in portable electronics. Here, a graphene-MoS2 composite material is investigated as a potential electrode material which enhances the electrochemical storage ability of the Li-ion batteries (LIBs). Graphene-MoS2 composite is synthesized from graphene oxide (GO), molybdenum trioxide and thiourea via hydrothermal route. Formation of graphene-MoS2 composite (molar ratio 1:2) is confirmed by X-ray diffraction ...
Citation Formats
E. E. Erdoğan, “Development of cathode materials for li-ion batteries by sputter deposition,” M.S. - Master of Science, Middle East Technical University, 2022.