Defective 1T′-ReSe2 nanosheets vertically grown on elastic MXene for fast and stable potassium ion storage

Abstract

The sluggish reaction kinetics and poor structure stability of transition metal dichalcogenides (TMDs)based anodes in potassium-ion batteries (KIBs) usually cause limited rate performance and rapid capacity decay, which seriously impede their application. Herein, we report a vacancy engineering strategy for preparing a class of Te-doped 1T'-ReSe 2 anchored onto MXene (Te-ReSe 2 /MXene) as an advanced anode for KIBs with high performance. By taking advantage of the synergistic effects of the defective Te-ReSe 2 arrays with expanded interlayers and the elastic MXene nanosheets with self-autoadjustable function, the Te-ReSe 2 / MXene superstructure exhibits boosted K + ion storage performance, in terms of high reversible capacity (361.1 mA h g −1 at 0.1 A g −1 over 200 cycles), excellent rate capability (179.3 mA h g −1 at 20 A g −1 ), ultra-long cycle life (202.8 mA h g −1 at 5 A g −1 over 2000 cycles), and steady operation in flexible full battery, presenting one of the best performances among the TMDs-based anodes reported thus far. The kinetics analysis and theoretical calculations further indicate that satisfactory pseudocapacitive property, high electronic conductivity and outstanding K + ion adsorption/ diffusion capability corroborate the accelerated reaction kinetics. Especially, structural characterizations clearly elaborate that the Te-ReSe 2 /MXene undergoes reversible evolutions of an initial insertion process followed by a conversion reaction.

Tunable Interfacial Electric Field‐Mediated Cobalt‐Doped FeSe/Fe3Se4 Heterostructure for High‐Efficiency Potassium Storage

“…Se atoms are usually potassiophilic active sites for potassium storage according to related work. [33,34] The reactivity of Se atoms in the UN-CoFe 4 Se 5 heterostructure can be activated by breaking the periodicity of the system using Co heteroatoms with different electronic arrangements. Specifically, the effect of Co doping on Se site activity can be evaluated through covalent character.…”

Preparation and Properties of P-Bi2Te3/MXene Superstructure-based Anode for Potassium-Ion Battery

“…。然而，钾离子电池的研究 目前还处于初级阶段， 仍有诸多问题需要解决。 由 于钾较大的离子半径(0.138 nm)，极易使负极在电 化学循环过程中出现较大的体积形变，严重影响 电池的循环性能和安全稳定性 3,4 。因此，开发高性 能负极材料是钾离子电池的重要研究方向 5 。 目前，钾离子电池的负极材料主要有碳基材 料 2,6 、合金材料 7 、金属氧化物 8 、金属硫族化物以 及有机化合物等 [9][10][11] 。 钾离子电池负极的反应机制可 分为三类： 嵌入反应 12 、 合金化反应和转化反应 13,14 。 碳基材料中的石墨、硬碳以及软碳作为钾离子电 池负极容易出现晶格体积变化大，限制钾离子扩 散的问题 7 。铋、锑等常见的合金材料虽然理论容 量高，但是合金化过程中的体积变化会使结构不 稳定 15,16…”

Electron‐Extraction Engineering Induced 1T’’‐1T’ Phase Transition of Re0.75V0.25Se2 for Ultrafast Sodium Ion Storage

“…Hence, 1T’’ ReSe 2 facilitates the insertion/extraction of large radius Na + as a promising anode for the sodium ions batteries. [ 30 , 31 , 32 , 33 , 34 , 35 , 36 ] However, the volume expansion and low conductivity of 1T’’ ReSe 2 still cannot match the dynamics of the high‐rate electrochemical reaction. [ 37 ]…”

“…Hence, 1T'' ReSe 2 facilitates the insertion/extraction of large radius Na + as a promising anode for the sodium ions batteries. [30][31][32][33][34][35][36] However, the volume expansion and low conductivity of 1T'' ReSe 2 still cannot match the dynamics of the high-rate electrochemical reaction. [37] To improve the electrochemical capacity of bulk ReSe 2 , phase transition engineering was carried out to optimize crystal structure and enhance electrical conductivity.…”