Enabling flexible heterostructures for Li‐ion battery anodes based on nanotube and liquid‐phase exfoliated 2D gallium chalcogenide nanosheet colloidal solutions
Zeitschrift:
Small
Jahrgang:
13
Heftnummer:
34
Jahr:
2017
Seiten von - bis:
1701677
Sprache:
Englisch
Abstract:
2D metal chalcogenide (MC) nanosheets (NS) have displayed high capacities as lithium‐ion battery (LiB) anodes. Nevertheless, their complicated synthesis routes coupled with low electronic conductivity greatly limit them as promising LiB electrode material. Here, this work reports a facile single‐walled carbon nanotube (SWCNT) percolating strategy for efficiently maximizing the electrochemical performances of gallium chalcogenide (GaX, X = S or Se). Multiscaled flexible GaX NS/SWCNT heterostructures with abundant voids for Li+ diffusion are fabricated by embedding the liquid‐exfoliated GaX NS matrix within a SWCNT‐percolated network; the latter improves the electron transport and ion diffusion kinetics as well as maintains the mechanical flexibility. Consequently, high capacities (i.e., 838 mAh g−1 per gallium (II) sulfide (GaS) NS/SWCNT mass and 1107 mAh g−1 per GaS mass; the latter is close to the …