Graphene‐functionalised Olivine Lithium Manganese Phosphate Derivatives for High Performance Lithium‐ion Capacitors

Abstract

Lithium manganese phosphate nanoparticles (LiMnPO 4 ; LMP) as well as the nickel-doped (LMNP) and graphenised derivatives (G-LMNP) were synthesized. Electrochemical characteristics of the materials were examined using cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge-discharge. Lithium ion capacitors (LIC) fabricated using LMP and composite materials as positive electrodes and activated carbon as the negative electrode, exhibited a specific capacitance of 60 F g À 1 at a current load of 0.1 A g À 1 for the AC//G-LMNP LIC. Capacitance retention of 83 % was obtained by the AC//G-LMNP LIC after 750 cycles, with a high specific power of 19 kW kg À 1 at 0.5 A g À 1 .

Boron‐Catalyzed Graphitization Carbon Layer Enabling LiMn0.8Fe0.2PO4 Cathode Superior Kinetics and Li‐Storage Properties

“…Meanwhile, two strong peaks at 1334 and 1587 cm −1 are assigned to the disordered carbon ( D ‐band) and graphitic carbon ( G ‐band) with the mode of E 2g . [ 20 ] The corresponding peak intensity ratio ( I D /I G ) reflects the ordering degree in the carbon layer. A lower I D / I G value presents a higher graphitization degree of the pyrolytic carbon, which is helpful to form a favorable reticulate structure.…”

Sustainable Hydrothermal and Solvothermal Synthetic Approaches for Advanced Carbon Materials in Multidimensional Applications: A Review

“…They further used the wet chemical method to synthesise Graphene/Ni-doped LiMnPO4 (G-LMNP), the results showed outstanding peak current intensity from electrochemical characterisation. This observation suggested an improved electrochemical reversibility; this can be ascribed to the conducting graphene layers, which provided new pathways for electron transfer thus facilitating the redox reaction [33]. The below graph (Figure 3) suggests the suitability of the G-LMNP for high power energy storage applications.…”

Sustainable Hydrothermal and Solvothermal Synthesis of Advanced Carbon Materials in Multidimensional Applications: A Review

“…The result was enhanced electrochemical reversibility, and this can be ascribed to the highly conductive graphene layers. These graphene layers provided new pathways for electron transfer, and thus facilitating the redox reaction [45]. The graph given on Figure 3 suggests the suitability of the G-LMNP for high-power energy storage applications.…”