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The maximally disordered (MD) phases with the general formula Y 5-x Pr x Sb 3-y M y (M = Sn, Pb) are formed with partial substitution of Y by Pr and Sb by Sn or Pb in the binary Y 5 Sb 3 compound. During the electrochemical lithiation and sodiation, the formation of Y 5-x Pr x Sb 3-y M y Li z and Y 5-x Pr x Sb 3-y M y Na z maximally disordered-high entropy intermetallic phases (MD-HEIP), as the result of insertion of Li/Na into octahedral voids, were observed. Carbon nanotubes (CNT) are an effective additive to improve the cycle stability of the Y 5-x Pr x Sb 3-y M y (M = Sn, Pb) anodes for lithium-ion (LIBs) and sodium-ion batteries (SIBs). Modification of Y 5-x Pr x Sb 3-y Sn y alloys by carbon nanotubes allowed us to significantly increase the discharge capacity of both types of batteries, which reaches 280 mAh · g -1 (for LIBs) and 160 mAh · g -1 (for SIBs), respectively. For Y 5-x PrxSb 3-y Pb y alloys in which antimony is replaced by lead, these capacities are slightly smaller and are 270 mAh · g -1 (for LIBs) and 155 mAh · g -1 (for SIBs), respectively. Results show that structure disordering and CNT additives could increase the electrode capacities up to 30% for LIBs and up to 25% for SIBs.

Enhancement of Y5−xPrxSb3−yMy (M = Sn, Pb) Electrodes for Lithium- and Sodium-Ion Batteries by Structure Disordering and CNTs Additives