Boosting cobalt ditelluride quantum-rods anode materials for excellent potassium-ion storage via hierarchical physicochemical encapsulation

Zhou, Qianwen; Yuan, Lingling; Li, Ting; Qiao, Shuangyan; Ma, Meng; Wang, Yikun; Chong, Shaokun

doi:10.1016/j.jcis.2023.05.073

Cited by 8 publications

(1 citation statement)

References 68 publications

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“…3 j and S16d), the characteristic peaks of K 5 Te 3 reappear, accompanied by the disappearance of the K 2 Te and the weakening of the Co metal, further indicating that the Co metal is a redox center for the reversible conversion process (Fig. S1 6d) [ 39 ]. Interestingly, the binding energy of K 2 p spectra at different voltage states of the CoTe 2 @NC@NPCNF anode, located at 292.5 and 294.8 eV, is attributed to the formation of K 2 CO 3 contained in the SEI layer (Fig.…”

Section: Resultsmentioning

confidence: 99%

Efficient Polytelluride Anchoring for Ultralong-Life Potassium Storage: Combined Physical Barrier and Chemisorption in Nanogrid-in-Nanofiber

Li,

Yu,

Peng

et al. 2024

Nano-Micro Lett.

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Metal tellurides (MTes) are highly attractive as promising anodes for high-performance potassium-ion batteries. The capacity attenuation of most reported MTe anodes is attributed to their poor electrical conductivity and large volume variation. The evolution mechanisms, dissolution properties, and corresponding manipulation strategies of intermediates (K-polytellurides, K-pTex) are rarely mentioned. Herein, we propose a novel structural engineering strategy to confine ultrafine CoTe2 nanodots in hierarchical nanogrid-in-nanofiber carbon substrates (CoTe2@NC@NSPCNFs) for smooth immobilization of K-pTex and highly reversible conversion of CoTe2 by manipulating the intense electrochemical reaction process. Various in situ/ex situ techniques and density functional theory calculations have been performed to clarify the formation, transformation, and dissolution of K-pTex (K5Te3 and K2Te), as well as verifying the robust physical barrier and the strong chemisorption of K5Te3 and K2Te on S, N co-doped dual-type carbon substrates. Additionally, the hierarchical nanogrid-in-nanofiber nanostructure increases the chemical anchoring sites for K-pTex, provides sufficient volume buffer space, and constructs highly interconnected conductive microcircuits, further propelling the battery reaction to new heights (3500 cycles at 2.0 A g−1). Furthermore, the full cells further demonstrate the potential for practical applications. This work provides new insights into manipulating K-pTex in the design of ultralong-cycling MTe anodes for advanced PIBs.

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Section: Resultsmentioning

confidence: 99%