Clarifying the origin of molecular O2 in cathode oxides

Our group leader Dr. Dmitry Aksenov and Dr. Andrey Geondzhian made a significant contribution to a study focused on the large-scale spectroscopic investigation of the anionic oxidation reaction mechanism in oxide-based cathode materials for lithium-ion batteries. The researchers conducted detailed modeling of various oxygen clusters in NMC materials with compositions 811 and 111, as well as Li-rich NMC and simulated the corresponding XPS spectra. The modeling revealed that molecular O2 forms under X-ray exposure during spectroscopic experiments but does not originate from the material's inherent structure. This study gives hope for the possibility of more efficient use of Li-rich NMC and rejects the pessimistic hypothesis of material degradation due to the formation of molecular oxygen.For further details, the full paper is available via the link.

The reasearch was covered by the media, including Atomic Energy [rus], Tech, Post & Science [eng], Skoltech news page [rus, eng] and others. Congratulations to Dmitry and Andrey, wishing all the best with upcoming high-level research!

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In the past two days, March 3rd to 4th, the Materials & Matter conference took place at Skoltech. The first day ended with a poster session, where researchers from our group presented their work:

  • Andrey Geondzhian presented "X-ray Spectroscopy of Negative Charge Transfer Insulators"

  • Artem Dembitsky presented "Screening of Protective Coatings for Li-Ion Solid-State Batteries using Universal Interatomic Potentials"

  • Nikita Davydov presented "First-Principle Study of the Impact of Grain Boundaries on Oxygen Loss in LiNiO2 Cathode Material"

  • Maria Solovieva presented "Using Curvature Pattern to Explore Sodium Adsorption Mechanism in Hard Carbon Anode Material for Metal-Ion Batteries: A DFT Study"

Anton Boev and Arseniy Burov presented their theses in a correspondence format. The topics of their research works were:

  • "Origin of Capacity Retention in Ti-Doped LiCoO2: An AIMD Study of Ti Segregation Effects on Antisite Defects, Oxygen Vacancies, and Li Charge Transfer at the LiCoO2/EC Interface" (by Anton)

  • "Multi-level Computational Study of "Pinned" Li+ Ions Phenomenon in Novel KTiOPO4-Structured Li1-xNaxVPO4F (x = 0, 0.15) Cathodes". (by Arseniy)

It was a great pleasure to participate in the first conference of the year for our group!

 

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Подводные камни ИИ в современной химии и молекулярном моделировании

Михаил Медведев

Мы приглашаем вас на семинар по вычислительному материаловедению. В этот раз приглашенный докладчик к.ф.-м.н. Михаил Медведев представит доклад, в котором осветит тему применения ИИ в теоретической химии, расскажет о его преимуществах и разумном применении в исследованиях.

Дата: 13 февраля (четверг), 17.00 МСК

Семинар пройдет оффлайн в Сколтехе (ауд. B2-3005), онлайн-трансляция не планируется.

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Molecular dynamics of carbon-based materials: current trends and challenges

Nikita Orekhov

We invite you to the Computational Materials Science seminar. The speaker, Dr. Nikita Orekhov, will give a talk on molecular dynamics and development of interatomic potentials for carbon.

Date: Thursday, December 5th at 4 p.m. (MSK).

We invite you to join the seminar offline at Skoltech (Room B2-3005) or online.

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From 15th to 19th of November, the IXth International School-Conference of Young Scientists "Synthesis of Electrode Materials" was held at Skoltech. Our team participated in the conference as organizers of the computational track "Guiding Synthesis by Materials Modeling".

During the conference, Dmitry Aksyonov gave a lecture titled "Atomistic Modeling for Guiding Synthesis of Materials". In his lecture, Dmitry introduced materials modeling, overviewed the methods and scales used, and then demonstrated an example case of modeling processes in co-precipitation synthesis. He also provided a review of DFT atomistic modeling and its basics.

Anton Boev presented a lecture on "Application of Modeling for Materials Synthesis". He provided a guide on how simulations can help in the wet laboratory during material development. The topics he covered included high-throughput DFT screening of new materials and dopants, useful databases of experimental techniques for material synthesis (Materials Project Synthesis Explorer). He also explained how to use computational methods for modeling of phase diagrams and talked about Wulff shapes of the particles. At the end of the lecture, Anton gave some examples of works on modeling completed by our group.

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Track “Guiding Synthesis by Materials Modeling” included several tutorials and mini-lectures, given by Dmitry Aksyonov, Anton Boev, Arseniy Burov, Andrey Geondzhian and Maria Solovieva. The topics covered were:

  • Modeling point defects in solids;

  • Construstion of phase diagrams;

  • Particles morphology and Wulff shapes;

  • X-ray absorbtion spectra from the first principles.

Presentations and workshop materials are published in “Teaching” section of our website.

We would like to thank all our participants for productive five days and we are looking forward to the Xth ICYS next year!

 

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