Influence of the Specific Surface Area of Graphene Nanoplatelets on the Capacity of Lithium-Ion Batteries

Abstract

In order to understand the influence of the morphological properties of graphene materials on the electrochemical performance of electrodes for lithium-ion batteries, three different graphene nanoplatelets with the increasing specific surface area (NP1: 296 m2 g−1, NP2: 470 m2 g−1, and NP3: 714 m2 g−1) were added in the electrode formulation in different ratios. Higher specific surface area graphene nanoplatelets (NP3) exhibit reversible capacity up to 505 mA h g−1 in the first discharge cycle (29.5% higher than that of graphite). Although significant irreversible capacity is shown for NP3, still higher reversible capacity is obtained compared to that of graphite electrode. The presence of micropores in the graphene structure benefits the lithiation. C-rate capability tests also show better performance of the graphene-based electrode. In this work, we demonstrate that graphene nanoplatelets with high specific surface area (714 m2 g−1) improve the electrochemical performance of Li-ion battery electrodes. The relationship between specific surface area, the presence of defects, and porosity is discussed.

Composite Graphene‐Modified Aluminum Foil Cathode Current Collectors for Lithium‐ion Battery with Enhanced Mechanical and Electrochemical Performances

“…Also, GM‐AGD‐Al‐CCs exhibited the highest specific capacity at a current density of 1 C (Figure S6). The study showed that the current collector modified with graphene exhibits enhanced capacity and cycling stability as compared to the carbon‐coated aluminum foil at high current density [25] . This is attributed to the large specific surface area of graphene and the increased contact area and adhesion between the active substance and the aluminum foil through the graphene coating [26] .…”

“…The study showed that the current collector modified with graphene exhibits enhanced capacity and cycling stability as compared to the carbon-coated aluminum foil at high current density. [25] This is attributed to the large specific surface area of graphene and the increased contact area and adhesion between the active substance and the aluminum foil through the graphene coating. [26] Figure S7 shows the nitrogen adsorption and desorption curves of graphene and conductive carbon black (the coating on the surface of the carbon-coated aluminium foil).…”

Enhanced Electrochemical Performance and Cyclic Stability of Li-Ion Batteries by Employing Nanostructured Bi2Te3 Particles with Amorphous ZrO2 Nanocoating

“…The untreated Bi 2 Te 3 possesses a surface area of 2.553 m 2 g –1 , which is about 5 folds of commercially available powder (0.56 m 2 g –1 , Sigma-Aldrich) . The enhanced surface area obtained by mechanical alloying may endure alloying reactions with lithium during the cycling process which ultimately increases the energy storage capabilities . Although no distinct vertical linear zone at the low-pressure ratio is observed, the higher amount of adsorbed N 2 for BTZ0 than that of BTZ-2 suggests the presence of more micropores.…”

Metal‐Organic Framework/Graphene Nanoplatelet Composite Increases Rate Performance of Lithium–Sulfur Batteries

“…In contrast, graphene-based materials are accepted as one of the most promising electrode materials for various energy storage applications due to their superior thermal and electrical conductivity and strong mechanical properties. [39] It has been stated that these materials can potentially increase the capacities and cycle performance of batteries at safer operating conditions. [40,41] Specifically, graphene nanoplatelets (GNPs) are a two-dimensional (2D) form of graphene where lateral surfaces can host redox-active materials effectively with exceptional in-plane conductivity.…”