Creation of a rigid host framework with optimum crystal structure and interface for zero-strain K-ion storage

Abstract

Potassium-ion batteries (KIBs) have gained considerable attention for stationary energy storage devices due to their low cost, natural abundance, and high energy density. However, owing to the significant strain caused...

Enabling rapid pseudocapacitive multi-electron reactions by heterostructure engineering of vanadium oxide for high-energy and high-power lithium storage

“…In contrast, the 2D V 2 O 5 /graphene heterostructure exhibits significantly enhanced DOS near the Fermi level, which indicates improved electronic conductivity due to energy gap contraction. 20,47 Besides, the shift of the Fermi level toward the conduction band in the heterostructure suggests lowered work function and augmented concentration of electrons in the conduction band, which further demonstrate the enhanced electronic conductivity of n-type vanadium oxide. 48,49 The charge density difference depicted in Fig.…”

Designing strategies of advanced electrode materials for high-rate rechargeable batteries

“…In order to compensate the unsaturated coordination environment of the niobium oxide external surface, a highly graphitized carbon layer was in situ coated on the nanosheet TiNb 2 O 9 to form heterogeneous interfaces for overcoming the limitation of large K + ion storage sites inside the TiNb 2 O 9 crystal. 161 A coral-like porous carbon layer also can be formed by in situ polymerization of dopamine hydrochloric acid for protecting the co-doped T-Nb 2 O 5 (Fig. 5i).…”

A New Candidate in Polyanionic Compounds for Potassium Ion Battery Anode: MXene Derived Carbon Coated π‐Ti2O(PO4)2

“…However, the occupied of internal tunnel in polyanion compounds by structural K + or protons, such as the crystal structure of KTiOPO 4 , HTiOPO 4 , or Ti 2 O(PO 4 ) 2 (H 2 O), is considered to affect the K + diffusion. [25] In addition, the low electronic conductivity, high dead weight caused by the inactive "PO 4 " would lead to detrimental effects on potassium storage. [26] Herein, a kind of 1D π-type titanium oxide phosphate (π-Ti 2 O(PO 4 ) 2 ) with carbon-coated (TOP@C) is synthesized through a simple Ti 3 C 2 T x MXene derived method.…”