Search

Your search keyword '"Joraleechanchai, Nattanon"' showing total 27 results
Start Over Author "Joraleechanchai, Nattanon"
27 results on '"Joraleechanchai, Nattanon"'

6. Exploring the impact of metal oxide coating and metal atom doping on the electrochemical performance of Ni-rich cathode materials.

Author

Bunyanidhi, Panyawee, Phattharasupakun, Nutthaphon, Duangdangchote, Salatan, Prempluem, Surat, Joraleechanchai, Nattanon, and Sawangphruk, Montree

Abstract

In this research, we systematically examine the impact of atomic cation dopants and metal oxide coatings, including their respective oxidation states, on the electrochemical performance of Ni-rich NCA90 cathode materials. The study reveals that dopants exhibiting varied oxidation states, derived from high annealing temperatures, can efficaciously mitigate H2–H3 phase transitions, thereby amplifying the structural stability of the materials. Complementary Density Functional Theory (DFT) calculations corroborate that a judiciously selected dopant can enhance the electronic attributes of the cathode materials. Notably, the incorporation of a tungsten dopant is found to markedly modulate the kinetics of lithium transfer throughout the battery cycling process. This research provides vital insights into the role of cation dopants and metal oxide coatings in optimizing the electrochemical performance of Ni-rich cathode materials. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

20. Core-shell structure of LiMn2O4 cathode material reduces phase transition and Mn dissolution in Li-ion batteries.

Author

Tomon, Chanikarn, Sarawutanukul, Sangchai, Phattharasupakun, Nutthaphon, Duangdangchote, Salatan, Chomkhuntod, Praeploy, Joraleechanchai, Nattanon, Bunyanidhi, Panyawee, and Sawangphruk, Montree

Subjects
LITHIUM-ion batteries, PHASE transitions, CATHODES, LATTICE constants, TRANSITION metals, HIGH voltages, THERMAL stability
Abstract

Although the LiMn2O4 cathode can provide high nominal cell voltage, high thermal stability, low toxicity, and good safety in Li-ion batteries, it still suffers from capacity fading caused by the combination of structural transformation and transition metal dissolution. Herein, a carbon-coated LiMn2O4 cathode with core@shell structure (LMO@C) was therefore produced using a mechanofusion method. The LMO@C exhibits higher cycling stability as compared to the pristine LiMn2O4 (P-LMO) due to its high conductivity reducing impedance growth and phase transition. The carbon shell can reduce direct contact between the electrolyte and the cathode reducing side reactions and Mn dissolution. Thus, the cylindrical cell of LMO@C//graphite provides higher capacity retention after 900 cycles at 1 C. The amount of dissoluted Mn for the LMO@C is almost 2 times lower than that of the P-LMO after 200 cycles. Moreover, the LMO@C shows smaller change in lattice parameter or phase transition than P-LMO, indicating to the suppression of λ-MnO2 phase from the mixed phase of Li1-δMn2O4 + λ-MnO2 when Li-delithiation at highly charged state leading to an improved cycling reversibility. This work provides both fundamental understanding and manufacturing scale demonstration for practical 18650 Li-ion batteries. Its high nominal voltage, thermal stability, and low toxicity render LiMn2O4 a highly promising cathode material for lithium ion batteries, but capacity fading due to unwanted side reactions during cycling remains an issue. Here, the authors show that carbon-coating a LiMn2O4 cathode reduces side reactions such as manganese dissolution and manganese oxide formation, thereby improving battery cycling stability. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results