Abstract
Germanium sulfide (GeS2) is promising anode material for sodium ion batteries (SIBs) because of its high theoretical capacity, but it usually shows poor long-term cycling performance owing to the large volume change during sodiation/desodiation. In this work, the GeS2/C composites were synthesized via a facile solid-state method, and then the three-dimensional flexible electrode (3D-GeS2/C electrode) was prepared by freeze-drying and heat treatment after cross-linking the GeS2/C with carbon nanotube (CNT). The carbon layer of GeS2/C and the CNT network in 3D-GeS2/C electrode effectively restrain the volume expansion and enhance the electric conductivity, thus improving the cycling stability of GeS2. In consequence, the reversible capacities of 3 3%-GeS2/C, 66 %-GeS2/C and 75 %-GeS2/C can remain at 159.6, 382.2 and 290.2 mAh g−1 at 200th cycle. More importantly, the 3D-GeS2/C electrode exhibit a capacity of 266.5 mAh g−1 and the corresponding specific surface capacities of 3.30 mAh cm−2 after 500 cycles. These results probably provide an inspiration for elevating the performance of GeS2 and fabricating 3D flexible electrode.
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