期刊
SMALL
卷 16, 期 2, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201905789
关键词
alloy anode; bismuth nanodots; operando X-ray diffraction; potassium-ion battery; 2D sodium bismuthate
类别
资金
- National Basic Research Program of China (973 Program) [2017YFA0403400, 2017YFA0402800, 2016YFA0401000]
- National Science Foundation of China (NSFC) [U1732121, U1932201, 21203235, 21303147]
- Shanghai Sailing Program [19YF1452700]
- CAS Pioneer Hundred Talents Program
- Henan Haizhisen Energy Technology Co., LTD.
Metallic bismuth (Bi) has been widely explored as remarkable anode material in alkali-ion batteries due to its high gravimetric/volumetric capacity. However, the huge volume expansion up to approximate to 406% from Bi to full potassiation phase K3Bi, inducing the slow kinetics and poor cycling stability, hinders its implementation in potassium-ion batteries (PIBs). Here, facile strategy is developed to synthesize hierarchical bismuth nanodots/graphene (BiND/G) composites with ultrahigh-rate and durable potassium ion storage derived from an in situ spontaneous reduction of sodium bismuthate/graphene composites. The in situ formed ultrafine BiND (approximate to 3 nm) confined in graphene layers can not only effectively accommodate the volume change during the alloying/dealloying process but can also provide high-speed channels for ionic transport to the highly active BiND. The BiND/G electrode provides a superior rate capability of 200 mA h g(-1) at 10 A g(-1) and an impressive reversible capacity of 213 mA h g(-1) at 5 A g(-1) after 500 cycles with almost no capacity decay. An operando synchrotron radiation-based X-ray diffraction reveals distinctively sharp multiphase transitions, suggesting its underlying operation mechanisms and superiority in potassium ion storage application.
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