Carbon wrapped hierarchical Li3V2(PO4)3 microspheres for high performance lithium ion batteries

Abstract

Nanomaterials are extensively studied in electrochemical energy storage and conversion systems because of their structural advantages. However, their volumetric energy density still needs improvement due to the high surface area, especially the carbon based nanocomposites. Constructing hierarchical micro-scaled materials from closely stacked subunits is proposed as an effective way to solve the problem. In this work, Li3V2(PO4)3@carbon hierarchical microspheres are prepared by a solvothermal reaction and subsequent annealing. Hierarchical Li3V2(PO4)3 structures with different subunits are obtained with the aid of polyvinyl pyrrolidone (PVP). Moreover, excessive PVP interconnect and form PVP-based hydrogels, which later convert into conductive carbon layer on the surface of Li3V2(PO4)3 microspheres during the annealing process. As a cathode material for lithium ion batteries, the 3D carbon wrapped Li3V2(PO4)3 hierarchical microspheres exhibit high rate capability and excellent cycling stability. The electrode has the capacity retention of 80% after 5000 cycles even at 50C.

Gadolinium/chloride co-doping of lithium vanadium phosphate cathodes for lithium-ion batteries

“…5(a), all the co-doped samples displayed three distinct plateaus. This indicates the lithiation/ delithiation process involves three steps, which is in good agreement with the redox peaks in the CV curves [38,40]. The electrochemical performance of the Li 3 V 1.98 Gd 0.02 (PO 4 ) 3 -x / 3 Cl x sample with x = 0.02 was better than that of the other samples.…”

Vanadium‐Based Nanomaterials: A Promising Family for Emerging Metal‐Ion Batteries

“…Lithium vanadium phosphate, Li 3 V 2 (PO 4 ) 3 (LVP), has been extensively studied as a cathode for LIBs recently, which exhibits a high average potential of ≈4.0 V (V vs Li + /Li), a considerable theoretical specific capacity of 197 mAh g −1 (3 Li + insertion/extraction) and a fast lithium‐ion diffusion coefficient of 10 −9 to 10 −10 cm 2 s −1 . Since the superior structure features and electrochemical properties, LVP also attracted interests for Na storage.…”

“Three‐in‐One:” A New 3D Hybrid Structure of Li3V2(PO4)3 @ Biomorphic Carbon for High‐Rate and Low‐Temperature Lithium Ion Batteries

“…As shown in Figure b, all the patterns show two broad peaks at around 1590 and 1350 cm −1 , which are attributed to the G and D bands of carbonaceous materials, respectively . The relative intensity of the D and G bands, I D / I G , provides useful information on graphitic crystalline of the carbonaceous materials . The I D / I G values of the LVP@HPBC and LVP@C‐R are 0.99 and 1.01, respectively, showing a similar degree of graphitization.…”