Y_1-xDy_xSn_2-yM_y (M = Sb, Pb) electrode materials activated by CNT and Mg–T–Ga (T = Co, Ni) phases for lithium- and sodium-ion batteries

Chem. Met. Alloys 13 (2020) 70-77

https://doi.org/10.30970/cma13.0408

Volodymyr PAVLYUK, Wojciech CIESIELSKI, Nazar PAVLYUK, Hryhoriy DMYTRIV, Damian KULAWIK, Agnieszka BALIŃSKA, Karolina KLUZIAK

The new quaternary Y_1-xDy_xSn_2-yM_y (M = Sb, Pb) phases crystallize as maximally disordered (MD) representatives with the orthorhombic structure type ZrSi₂. During electrochemical lithiation and sodiation, the formation of Y_1-xDy_xSn_2-yM_yLi_z and Y_1-xDy_xSn_2-yM_yNa_z maximally disordered – high-entropy intermetallic phases (MD-HEIP), as the result of insertion of Li/Na into structural voids, was observed. Carbon nanotubes (CNT) and Mg–T–Ga (T = Co, Ni) phases are efficient catalytic additives to improve the cycling stability of the anodes for lithium-ion (LIBs) and sodium-ion batteries (SIBs). The results show that the catalysts can increase the electrode capacities up to 15 % for LIBs and up to 10 % for SIBs.

Electrochemical impedance spectra (EIS) of the electrodes for Li-ion cells (a) and Na-ion cells (b).

Keywords

Intermetallic compound / Crystal structure / Lithium-ion battery/ Sodium-ion battery