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

作　　者：Qinghua Li Dandan Yu Jian Peng Wei Zhang Jianlian Huang Zhixin Liang Junling Wang Zeyu Lin Shiyun Xiong Jiazhao Wang Shaoming Huang 

机构地区：[1]Guangzhou Key Laboratory of Low‑Dimensional Materials and Energy Storage Devices,School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,People’s Republic of China [2]College of Materials and Chemistry,China Jiliang University,Hangzhou 310018,People’s Republic of China [3]Institute for Superconducting and Electronic Materials,Australian Institute for Innovative Materials,University of Wollongong,Innovation Campus,Squires Way,North Wollongong,NSW 2522,Australia

出　　处：《Nano-Micro Letters》2024年第4期364-378,共15页纳微快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 51920105004, 52102223, 52002081)。

摘　　要：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-pTe_(x)) are rarely mentioned. Herein,we propose a novel structural engineering strategy to confine ultrafine CoTe_(2) nanodots in hierarchical nanogrid-in-nanofiber carbon substrates(CoTe_(2)@NC@NSPCNFs) for smooth immobilization of K-pTe_(x) and highly reversible conversion of CoTe_(2) 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-pTe_(x)(K_(5)Te_(3) and K_(2)Te), as well as verifying the robust physical barrier and the strong chemisorption of K_(5)Te_(3) and K_(2)Te on S, N co-doped dual-type carbon substrates. Additionally, the hierarchical nanogrid-in-nanofiber nanostructure increases the chemical anchoring sites for K-pTe_(x), 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-pTe_(x) in the design of ultralong-cycling MTe anodes for advanced PIBs.

关 键 词：Polytelluride dissolution Nanogrid-in-nanofiber structure Physicochemical adsorption Reaction mechanism Ultralonglife potassium storage 

分 类 号：TB383.1[一般工业技术—材料科学与工程] O647.3[理学—物理化学] TM912[理学—化学]