Double-walled carbon nanotubes, a performing additive to enhance capacity retention of antimony anode in potassium-ion batteries

Vincent Gabaudan (1) , Justine Touja (1) , Didier Cot (2) , Emmanuel Flahaut (3) , Lorenzo Stievano (1, 4) , Laure Monconduit (1, 4)

1 ICGM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
2 IEM - Institut Européen des membranes
3 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
4 RS2E - Réseau sur le stockage électrochimique de l'énergie

The effect of carbon additives on electrode formulation of bulk antimony was investigated in potassium-ion batteries. Several types of carbon including conventional carbon black, graphite and double-walled carbon nanotubes (DWCNT), employed as conductive agents, were found to play a non-negligible role on the electro-chemical performance of antimony. While DWCNT alone show no reversible K + storage compared to the other carbons, the Sb/DWCNT electrode exhibits better capacity retention and rate capability than Sb formulated with usual carbon additives or even with graphite. This can be ascribed to the specific structure of DWCNT acting not only as conductive additive but also as a mechanical reinforcement for the whole electrode, which has to withstand the large volume change of antimony during potassiation/depotassiation cycles.

Domaines: Matériaux

Vincent Gabaudan, Justine Touja, Didier Cot, Emmanuel Flahaut, Lorenzo Stievano, et al.. Double-walled carbon nanotubes, a performing additive to enhance capacity retention of antimony anode in potassium-ion batteries. Electrochemistry Communications, 2019, 105, pp.106493. ⟨10.1016/j.elecom.2019.106493⟩. ⟨hal-02196162⟩