Nanoscale Structure of Positive Electrodes for Lithium-Ion Batteries with Graphene-Based Additives according to Small-Angle Neutron Scattering

M. Yerdauletov; Ердаулетов М.; M. V. Avdeev; Авдеев М. В.; A. A. Tomchuk; Томчук А. А.; F. S. Napolskiy; Напольский Ф. С.; D. M. Djanseitov; Джансейтов Д. М.; V. A. Krivchenko; Кривченко В. А.

doi:10.31857/S1028096023040052

Nanoscale Structure of Positive Electrodes for Lithium-Ion Batteries with Graphene-Based Additives according to Small-Angle Neutron Scattering

Authors: Yerdauletov M.¹^,2^,3, Avdeev M.V.¹^,4, Tomchuk A.A.¹, Napolskiy F.S.⁴, Djanseitov D.M.²^,3, Krivchenko V.A.⁴
Affiliations:
1. Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research
2. Institute of Nuclear Physics, Ministry of Energy of the Republic of Kazakhstan
3. L.N. Gumilyov Eurasian National University
4. Dubna State University
Issue: No 4 (2023)
Pages: 61-66
Section: Articles
URL: https://journals.rcsi.science/1028-0960/article/view/137739
DOI: https://doi.org/10.31857/S1028096023040052
EDN: https://elibrary.ru/JYHLTO
ID: 137739

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Abstract

The adaptation of neutron scattering methods for studying the microstructure of electrode materials of lithium-ion batteries was continued in order to improve their characteristics with respect to specific energy. Using small-angle scattering of thermal neutrons, the effect of conductive carbon additives (graphene and graphene oxide) on the porous structure of electrodes made from LiFePO₄, Li₄Ti₅O₁₂ and LiNiMnCoO₂ was studied. To separate the scattering by closed and open pores, the electrodes were wetted with a typical liquid electrolyte with a deuterated liquid carrier (dimethyl carbonate), which led to the matching of scattering by open pores. It was established that the electrically conductive carbon additives changed the electrode porosity to varying degrees and affected the wettability of materials both due to different degrees of penetration into the pores of the source material and due to the effect on the initial matrix. A universal effect on the scattering of polymer binder (polyvinylidene fluoride) was also found.

Keywords

small-angle neutron scattering, cathode materials, porosity, lithium-ion energy storage devices.

References

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