Due to its highest theoretical capacity and low discharge potential, silicon (Si) is attracting an increasing attention as one of the most promising anodes for lithium ion batteries. However, the...
Li 3 VO 4 is considered to be one of the most promising anodes for lithium-ion batteries (LIBs), because of its high theoretical capacity and suitable lithium-inserting potential. Nevertheless, low conductivity and huge volume change leads to fast capacity fading, limiting its practical applications. Herein, continuous conductive carbon framework encapsulated Li 3 VO 4 (LVOÀ C) has been fabricated by using a facile ball-milling and calcination method. Owing to its unique structure, the intrinsic drawbacks of Li 3 VO 4 have been suppressed and the electro-chemical performance has been enhanced. When used as an anode for LIBs, LVOÀ C exhibits excellent cycling stability and rate capability. The enhanced Li + storage properties could be ascribed to the continuous carbon framework and protected carbon layers, which accelerate electron transportation and avoid the aggregations of Li 3 VO 4 particles. This fabrication strategy provides insight into the mass production of advanced electrodes for LIBs.
Aqueous zinc ion batteries (ZIBs) have been regarded as one of the most promising candidates for large-scale energy storage systems. Herein, low crystallinity Mn-doped Na 5 V 12 O 32 (NMVO) with hierarchical rodlike structure has been fabricated by a one-step hydrothermal method. Due to the rational design of the phase and micro/nanostructure, NMVO has numerous voids and defects, which are beneficial to the reversible insertion/extraction of zinc ions. When utilized as cathodes for ZIBs, the electrode delivers a capacity of 256.3 mAh g −1 after 50 cycles at 0.1 A g −1 . Moreover, NMVO presents stable cycling performance and rate capability in electrolyte with the addition of Na 2 SO 4 . The kinetic characterizations and diffusion mechanism are also studied, and the results demonstrate that the superior zinc ion storage properties of NMVO can be attributed to the equal capacitive contribution, fast ion diffusion coefficient, and favorable structural stability. This strategy can be extended to other electrode materials, such as manganese-based materials and molybdenum-based materials, et al.
The metal chalcogenides (MCs) for sodium-ion batteries (SIBs) have gained increasing attention owing to their low cost and high theoretical capacity. However, the poor electrochemical stability and slow kinetic behaviors hinder its practical application as anodes for SIBs. Hence, various strategies have been used to solve the above problems, such as dimensions reduction, composition formation, doping functionalization, morphology control, coating encapsulation, electrolyte modification, etc. In this work, the recent progress of MCs as electrodes for SIBs has been comprehensively reviewed. Moreover, the summarization of metal chalcogenides contains the synthesis methods, modification strategies and corresponding basic reaction mechanisms of MCs with layered and non-layered structures. Finally, the challenges, potential solutions and future prospects of metal chalcogenides as SIBs anode materials are also proposed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.