Recent Advances in 2D Heterostructures as Advanced Electrode Materials for Potassium‐Ion Batteries

Abstract

Owing to the cost-effectiveness, Earth abundance, and suitable redox potential, potassium-ion batteries (PIBs) stand out as one of the best candidates for largescale energy storage systems. However, the large radius of K þ and the unsatisfied specific capacity are the main challenges for their commercial applications. To address these challenges, constructing heterostructures by selecting and integrating 2D materials as host and other materials as guest are proposed as an emerging strategy to obtain electrode materials with high capacity and long lifespan, thus improving the energy storage capability of PIBs. Recently, numerous studies are devoted to developing 2D-based heterostructures as electrode materials for PIBs, and significant progress is achieved. However, there is a lack of a review article for systematically summarizing the recent advances and profoundly understanding the relationship between heterostructure electrodes and their performance. In this sense, it is essential to outline the promising advanced features, to summarize the electrochemical properties and performances, and to discuss future research focuses about 2D-based heterostructures in PIBs.

An Open‐Ended Ni3S2–Co9S8 Heterostructures Nanocage Anode with Enhanced Reaction Kinetics for Superior Potassium‐Ion Batteries

“…In addition, exploring high‐energy‐density anode materials is crucial to promote the whole energy density of PIBs. [ 16 ] Electrolyte also plays an important role in regulating the solid electrolyte interfaces (SEI) associated with the solvation structure and compositions. Selecting appropriate electrolyte system may be beneficial to the formation of stable SEI, and therefore improving the electrochemical performance of electrode materials for PIBs.…”

Flat–Zigzag Interface Design of Chalcogenide Heterostructure toward Ultralow Volume Expansion for High‐Performance Potassium Storage

“…Consequently, the deconstruction of heterostructures will occur after repeated K + insertion/ extraction, leading to the capacity fading and poor cycling lifespan. [11] Therefore, stable interface stacking for heterostructures is imperative to maintain the heterostructure integration for robust KIB performance. Considering that MoS 2 layers are in flat morphology, once we select a non-flat morphology metal chalcogenides, such as zigzag-morphology Bi 2 S 3 , to stack with MoS 2 , a flat-zigzag interface with much larger K + storage and transport channels will form in the MoS 2 /Bi 2 S 3 heterostructure, [12] offering ultralow volume expansion and a diffusion barrier.…”

Harnessing the Defects at Hetero‐Interface of Transition Metal Compounds for Advanced Charge Storage: A Review

“…[2,38,39] Heterostructures are composed of two different materials with different properties that are joined through multilayer heterojunctions at well-defined interfaces. [40][41][42][43][44] According to their DOI: 10.1002/sstr.202200022…”

“…Heterostructures are composed of two different materials with different properties that are joined through multilayer heterojunctions at well‐defined interfaces. [ 40–44 ] According to their interaction type, heterostructures can be categorized as either chemically bonded heterostructures or van der Waals heterostructures (vdWHs). Chemically bonded heterostructures contain both TMOs and TMDs and can be 0D to 3D, whereas vdWHs are often composed of 2D‐layered materials, e.g., TMDs.…”