Journal
ADVANCED MATERIALS
Volume 29, Issue 35, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201702212
Keywords
anodes; Bi; cycle life; glyme-based electrolytes; sodium-ion batteries
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Funding
- National Key R & D Program of China [2016YFB0101200]
- National Natural Science Foundation of China [21603108, 51671107]
- Natural Science Foundation of Tianjin [17JCQNJC06200]
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Sodium-ion batteries (SIBs) have attracted great interest for large-scale electric energy storage in recent years. However, anodes with long cycle life and large reversible capacities are still lacking and therefore limiting the development of SIBs. Here, a bulk Bi anode with surprisingly high Na storage performance in combination with glyme-based electrolytes is reported. This study shows that the bulk Bi electrode is gradually developed into a porous integrity during initial cycling, which is totally different from that in carbonate-based electrolytes and ensures facile Na+ transport and structural stability. The achievable capacity of bulk Bi in the NaPF6-diglyme electrolyte is high up to 400 mAh g(-1), and the capacity retention is 94.4% after 2000 cycles, corresponding to a capacity loss of 0.0028% per cycle. It exhibits two flat discharge/charge plateaus at 0.67/0.77 and 0.46/0.64 V, ascribed to the typical two-phase reactions of Bi NaBi and NaBi Na3Bi, respectively. The excellent performance is attributed to the unique porous integrity, stable solid electrolyte interface, and good electrode wettability of glymes. This interplay between electrolyte and electrode to boost Na storage performance will pave a new pathway for high-performance SIBs.
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