Synthesis and Electrochemical Properties of Li₃V₂(PO₄)₃-LiMnPO₄Composite Cathode Material for Lithium-ion Batteries

Abstract

Carbon-coated Li 3 V 2 (PO 4 ) 3 -LiMnPO 4 composite cathode materials are first reported in this work, prepared by the mechanochemical process with a complex metal oxide as the precursor and sucrose as the carbon source. X-ray diffraction pattern of the composite material indicates that both olivine LiMnPO 4 and monoclinic Li 3 V 2 (PO 4 ) 3 co-exist. We further investigated the electrochemical properties of our Li 3 V 2 (PO 4 ) 3 -LiMnPO 4 composite cathode materials using galvanostatic charging/discharging tests, where our Li 3 V 2 (PO 4 ) 3 -LiMnPO 4 composite electrode materials exhibit the charge/discharge efficiency of 91.9%, while Li 3 V 2 (PO 4 ) 3 and LiMnPO 4 exhibit the efficiency of 87.7 and 86.7% in the first cycle. The composites display unique electrochemical performances in terms of overvoltage and cycle stability, displaying a reduced gap of 141.6 mV between charge and discharge voltage and 95.0% capacity efficiency after 15 th cycles.

Porous spherical LiMnPO4·2Li3V2(PO4)3/C cathode material synthesized via spray-drying route using oxalate complex for lithium-ion batteries

“…All the experimental results indicated that the electrochemical performances of the composites were improved. However, the rate performances of xLiMnPO 4 ·yLi 3 V 2 (PO 4 ) 3 composites (x≥y) are still poor in recent studies, as the diffusion of lithium ions were limited under high rate charge-discharge cycle process [8,11,13].…”

“…Recently, a series of xLiMnPO 4 ·yLi 3 V 2 (PO 4 ) 3 composites have been prepared by various approaches, including the chemical reduction and lithiation [8], spray-drying [9], solid-state reaction [10,11], solution [7] and so-gel [12] methods. All the experimental results indicated that the electrochemical performances of the composites were improved.…”

A promising cathode for Li-ion batteries: Li3V2(PO4)3

“…To briefly summarize, cationic or anionic doping of LVP induces defects in the host lattice and strength the crystal framework by enhancing the electrical and ionic conductivity and stabilizing the crystal structure in the charge/ discharge process of LVP. In particular, foreign atoms with a larger radius can expand the cell volume to facilitate Li-ion migration, which notably enhances the electrochemical performances of the LVP host, especially at high current rates ( [190][191][192][193] and LiCoO 2 [194]. (3) LVP with metals, for example, Ag [195,196] and Cu [197].…”

Graphenised Lithium Iron Phosphate and Lithium Manganese Silicate Hybrid Cathodes: Potentials for Application in Lithium‐ion Batteries

“…Their results showed that the hybrid cathode with a 1 : 1 mass ratio gave better performances than the other mass ratios. Sadeghiet al [38] and Yun et al [40] have also prepared these hybrid cathodes in a slightly different manner where they used one cathode as the parent (main material) and the other as the coating or modifying material. Therefore, the parent is in higher ratio than the coating material.…”