Journal
NANO ENERGY
Volume 82, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.105784
Keywords
Bismuth tungstate; Bimetallic oxide anode; Microflowers architecture; Phase evolution; Potassium-ion batteries
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Funding
- National Natural Science Foundation of China [U1830106, 52061160482, 52005289, 21950410512]
- K.C. Wong Magna Fund in Ningbo University
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01N111]
- Guangdong Province Science and Technology Department [2020A0505100014]
- Shenzhen Government [JCYJ20170412171720306, JSGG20191129110201725]
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In this study, a sequential phase evolution mechanism for bimetallic oxide anodes is reported, which enables higher potassium ion storage capacity and superior cyclability.
Potassium-ion batteries (KIBs) are considered an important alternative for lithium-ion batteries owing to the abundant potassium (K) resources and low-cost. To date, most reported anode materials for KIBs have been limited to carbonaceous materials which can well accommodate the large potassium ions (K+) but show humble capacity performance. As compared, metal oxide-based anodes can potentially provide higher capacity yet cyclability is poor, which has been rarely researched. Herein, we report a sequential phase evolution mechanism for bimetallic oxide anode. Upon potassiation, the microflower-like Bi2WO6 undergoes a multistep evolution process, which first combines with K+ then converts into a highly reversible phase of Bi, then via a solid-solution reaction eventually it forms the K3Bi alloy. After repeated cycling process, such unique hierarchical and mesoporous morphology of Bi2WO6 can be well maintained, leading to superior cyclability with a high specific potassium storage capacity (652 mAh g-1 at 100 mA g-1). Even at a large current density of 1 A g-1, a reversible specific capacity of 216 mAh g-1 can still be delivered over 300 cycles. Such a novel working mechanism of bimetallic oxide anodes will promote the practical use of KIBs in diverse energy storage applications.
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