Journal
ADVANCED MATERIALS
Volume 32, Issue 23, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201908027
Keywords
charge storage mechanism; K-Te batteries; potassium-ion batteries; tellurium; volumetric capacity
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Funding
- National Natural Science Foundation of China [51822201, 51972292, 51532001]
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Currently, exploring high-volumetric-capacity electrode materials that allow for reversible (de-)insertion of large-size K+ ions remains challenging. Tellurium (Te) is a promising alternative electrode for storage of K+ ions due to its high volumetric capacity, confirmed in lithium-/sodium-ion batteries, and the intrinsic good electronic conductivity. However, the charge storage capability and mechanism of Te in potassium-ion batteries (KIBs) have not been unveiled until now. Here, a novel K-Te battery is constructed, and the K+-ion storage mechanism of Te is revealed to be a two-electron conversion-type reaction of 2K + Te <-> K2Te, resulting in a high theoretical volumetric capacity of 2619 mAh cm(-3). Consequently, the rationally fabricated tellurium/porous carbon electrodes deliver an ultrahigh reversible volumetric capacity of 2493.13 mAh cm(-3) at 0.5 C (based on Te), a high-rate capacity of 783.13 mAh cm(-3) at 15 C, and superior long-term cycling stability for 1000 cycles at 5 C. This excellent electrochemical performance proves the feasibility of utilizing Te as a high-volumetric-capacity active material for storage of K+ ions and will advance the practical application of KIBs.
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