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Boosting Sodium-Ion Storage by Encapsulating NiS (CoS) Hollow Nanoparticles into Carbonaceous Fibers
- Zhang, Yuhui, Lv, Chunxiao, Wang, Xin, Chen, Shuai, Li, Daohao, Peng, Zhi, Yang, Dongjiang
- ACS applied materials & interfaces 2018 v.10 no.47 pp. 40531-40539
- alginates, anodes, batteries, carbon fibers, electrochemistry, encapsulation, nanoparticles, sodium, sulfides
- Transition metal sulfides (TMSs) with high theoretical specific capacity and superior electrochemical performance are promising anode material candidates for sodium-ion batteries (SIBs). However, the structural pulverization because of the severe volume change in the discharge/charge process leads to a severe capacity decay, limited rate performance, and poor cycling stability, which inhibits their practical application. Herein, we report a novel strategy for the synthesis of TMS hollow nanoparticles@carbon fibers (TMS-HNP@CFs-T) by using seaweed-derived alginate as the template and precursor. When evaluated as anode materials for SIBs, the hybrids display excellent sodium storage performance. For instance, CoS-HNP@CFs-900 exhibits high reversible specific capacity, significant cycling stability (392.2 mA h g–¹ at 1000 mA g–¹ over 100 cycles), and rate performance (334.2 mA h g–¹ can be achieved at 5000 mA g–¹). The hollow TMP NPs and conductive carbon fibers could synergistically reduce the expansion of volume and shorten the ion transport path to boost the sodium storage performance.