期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 13, 页码 11564-11570出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b01454
关键词
hierarchical structure; Prussian blue analogues; dissolution-recrystallization strategy; potassium ion batteries; solid-state diffusion
资金
- National Natural Science Foundation of China [51832004, 21805219, 51521001]
- National Natural Science Fund for Distinguished Young Scholars [51425204]
- National Key R&D Program of China [2016YFA0202603]
- Programme of Introducing Talents of Discipline to Universities [B17034]
- Yellow Crane Talent (Science & Technology) Program of Wuhan City
- Fundamental Research Funds for the Central Universities [WUT: 2017IVA100, 2017IVA096, 2017III009, 2017III040]
Prussian blue analogues have attracted growing attention as the positive electrode materials in rechargeable potassium-ion batteries (KIBs) due to the intrinsic open frameworks and high theoretical capacities. However, the bulk synthesized Prussian blue which is accompanied by aggregation inevitably results in the limited K+ ion mobility and suppressed potassium storage performance. In this work, ultrathin nanosheet-assembled hierarchical Prussian blue materials (K1.4Fe4[Fe(CN)(6)](3)) are synthesized via a facile dissolution-recrystallization strategy. On the strength of this architecture, the positive electrode displays both high rate (71 and 24.9 mAh g(-1) at 50 and 600 mA g(-1)) and long life-span properties (75.2% of the primal capacity retained after 100 cycles) for potassium storage. The enhanced diffusion kinetics and structural stability are further demonstrated through the galvanostatic intermittent titration technique analysis and ex-situ X-ray diffraction. Our work provides a new nanostructuring strategy for improving the potassium storage in intercalation electrodes.
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