ИСТИНА

One of important considerations in lithium-ion battery technology is the performance of the anode. Currently, the anode in most commercial Li-ion batteries is graphite, which features quite low specific capacity and poor mechanic properties. Aluminium has been proposed as a possible alternative due to its low cost, wide availability and high theoretical capacity. A critical issue preventing the application of aluminium as an anode material seems to be the pulverization of the active materials during the lithiation-delithiation cycling due to large volume changes, which resulted in a pronounced capacity fading after a few charging-discharging cycles [1-4]. The processes involved still remain not well understood. In this work, we have investigated in detail the electrochemical behaviour of aluminium anodes in lithiation-delithiation processes. The ways to mitigate the effects of the volume change were found and explored. Working prototypes of Li-ion batteries with aluminium anodes, LiFePO4 cathodes and solid polymer electrolyte were prepared and tested. The prototypes demonstrated sustained lithiation-dilithiation cycling over more than 500 charge-discharge cycles with high coulombic efficiencies at various charging rates without any capacity fading. References 1. Y. Hamon, T. Brousse, F. Jousse, P. Topart, P. Buvat, and D.M. Schleich // J. Power Sources. 2001. V. 97-98. P. 185. 2. Y. Liu, N.S. Hudak, D.L. Huber, S.J. Limmer, J.P.Sullivan, and J.Y. Huang // Nano Lett. 2011. Vol. 11. P. 4188. 3. N.S. Hudak and D.L. Huber // J. Electrochem. Soc. 2012. V. 159. P. A688 4. C. Gong, D. Ruzmetov, A. Pearse, D. Ma, J.N. Munday, G. Rubloff, A.A. Talin, and M. S. Leite // ACS Appl. Mater. Interfaces. 2015. Vol. 7. P. 26007.