Core−Shell Li₃V₂(PO₄)₃@C Composites as Cathode Materials for Lithium-Ion Batteries

Abstract

Core-shell Li 3 V 2 (PO 4 ) 3 @C nanostructured composites were prepared via a sol-gel route followed by hydrothermal treatment. XRD patterns showed that Li 3 V 2 (PO 4 ) 3 has a monoclinic structure with space group P2 1 /n. TEM images exhibited that Li 3 V 2 (PO 4 ) 3 particles are encapsulated with a carbon shell ∼10 nm in thickness. Compared with pure Li 3 V 2 (PO 4 ) 3 , core-shell Li 3 V 2 (PO 4 ) 3 @C composites presented enhanced electrochemical Li ion intercalation performances. Cyclic voltammetry and electrochemical impedance spectroscopy disclosed that carbon shells improved Li ion diffusion and electrical conductance significantly and also retarded formation of solid electrolyte interphase film of Li 3 V 2 (PO 4 ) 3 cathode materials.

Evaluating the performance of nanostructured materials as lithium-ion battery electrodes

“…Early examples of hydrothermally prepared core-shell Li3V2(PO4)3@C composites, comprised of ~400 nm Li3V2(PO4)3 particles and a carbon shell of ~10 nm thickness, displayed a discharge capacity of approximately 130 mA h g -1 under a current density of 28 mA g -1 . The carbon-coated samples exhibited both enhanced rate capability and cyclic stability, retaining a discharge capacity of ~98.5% over 50 cycles while restricting the growth of passivating SEI layers [480]. Liu et al [484], have recently exploited the electronic properties of graphene by forming a Li3V2(PO4)3/graphene nanocomposite which displayed considerable rate capability.…”

Li3V2(PO4)3@C/graphene composite with improved cycling performance as cathode material for lithium-ion batteries

“…This problem can be partly solved by metal doping [20][21][22] or mixing with electronically conductive materials such as carbon [23,24]. Compared to traditional carbon, graphene nanosheet (GNS) shows excellent electronic conductivity and has been demonstrated as truly effective conductive additive for LIBs [25,26].…”

Ultrathin YSZ Coating on Pt Cathode for High Thermal Stability and Enhanced Oxygen Reduction Reaction Activity

“…Previous efforts include alloying with other metal, [ 16 ] infi ltrating into a thermally stable oxide-based matrix, [ 17,18 ] and fabricating core-shell nanocomposites. [19][20][21] While successful in enhancing cell durability, these approaches suffer from sacrifi ces in either catalytic performance or complexity of fabrication process.In this paper, we propose a simple yet effective alternative method to enhance cell performance and durability simultaneously: coating porous metal electrodes with an ultrathin oxide by atomic layer deposition (ALD), which is known to be a scalable and potentially high-throughput technique. [ 6,22,23 ] This approach is applied to the cathode of a µ-SOFC operating at 500 °C.…”