A novel “holey-LFP / graphene / holey-LFP” sandwich nanostructure with significantly improved rate capability for lithium storage

Abstract

The development of high-performance and new-structure electrode materials is vital for the wide application of rechargeable lithium batteries in electric vehicles. In this work, we design a special composite electrode structure with the macroporous threedimensional graphene areogel framework supporting mesoporous LiFePO4 nanoplate. It is realized using a simple sol-gel deposition method. The highly conductivity graphene nanosheets assemble into an interconnected three-dimensional macroporous areogel framework, while LiFePO4 grows along the graphene nanosheets and generates a mesoporous nanoplate structure. In comparison with LiFePO4, this unique sandwich nanostructure offers a greatly increased electronic conductivity thanks to the framework of graphene nanosheets. Also, the bimodal porous structure of the composite remarkably increases the interface between the electrode/electrolyte and facilitates the transport of Li + throughout the electrode, enabling the superior specific capacity, rate characteristic and cyclic retention.

Conversion of Natural Biowaste into Energy Storage Materials and Estimation of Discharge Capacity through Transfer Learning in Li-Ion Batteries

“…incorporation fostered by the nitrogen-doped carbon coating in NEM 700@LFP highlight a dynamic interplay of factors that ultimately augment the efficiency of charge-transfer reactions. These findings not only underscore the significance of nitrogen content in dictating electrochemical performance but also illuminate the nuanced impact of carbon disorder, providing valuable insights into the design principles of advanced electrode materials for high-performance energy storage systems [43]. Between a potential range of 2.5 and 4.2 V, the electrochemical behaviors of bare LFP and NEM 700@LFP were examined.…”

Minimizing ion/electron pathways through ultrathin conformal holey graphene encapsulation in Li- and Mn-rich layered oxide cathodes for high-performance lithium-ion batteries

“…Additionally, even after carbon coating, the specific surface area does not increase significantly compared to values reported in other studies. 29,47 Therefore, owing to the negligible increase in the specific surface area, no additional side reactions with the electrolyte are anticipated at the particle surface. 18 To determine whether the carbon coating affects the tap density of the LMR electrode, the tap densities of the BLMR, GLMR, and HGLMR samples were measured.…”

Improvement of specific capacity of lithium iron phosphate battery by increasing the surface area and electrical conductivity of cathode electrode using graphene foam

“…Figure 6(a) displays EIS of GF/LFP and LFP/GF which are fitted by a basis of the equivalent circuit as shown in the inset. The Rs, Rct, CPE and Zw, represent ohmic resistance, charge transfer resistance, capacitance of double layer and Li + migration related Warburg resistance, respectively [29]. Table 1 shows ohmic resistance and charge transfer resistance of GF/LFP and LFP/GF.…”