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

Yerdauletov M. Avdeev M.V. Tomchuk A.A. Napolskiy F.S. Djanseitov D.M. Krivchenko V.A.
April 2023 Pleiades Publishing

Journal of Surface Investigation
2023 #17 Issue 2 460 - 464 pp.

Abstract: In this paper, we continue the adaptation of neutron-scattering methods for studying the microstructure of electrode materials of lithium-ion batteries in order to improve their specific energy storage. The effect of conductive carbon additives (graphene and graphene oxide) on the porous structure of electrodes with various bases, including LiFePO₄, Li₄Ti₅O₁₂, and LiNiMnCoO₂, is studied via the small-angle scattering of thermal neutrons. To separate the scattering by closed and open pores, the electrodes are wetted with a typical liquid electrolyte with a deuterated liquid carrier (dimethyl carbonate), which leads to the matching of scattering by open pores. It is established that electrically conductive carbon additives change the porosity of the electrode to varying degrees and affect the wettability of materials due to both varying degrees of penetration into the pores of the initial material and the effect on the initial matrix. A universal effect on the dispersion of a polymer binder (polyvinylidene fluoride) is also found.

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

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Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Moscow region, Dubna, 141980, Russian Federation
Institute of Nuclear Physics, Ministry of Energy of the Republic of Kazakhstan, Almaty, 050032, Kazakhstan
Gumilyov Eurasian National University, Astana, 010000, Kazakhstan
Dubna State University, Moscow Region, Dubna, 141980, Russian Federation

Frank Laboratory of Neutron Physics
Institute of Nuclear Physics
Gumilyov Eurasian National University
Dubna State University

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