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.
Highlights
The reality of climate change has accelerated the energy transition to a more electrified society
Good C-rate capability is observed for all graphene nanoplatelets (GNPs), especially for NP3 retaining 290 mA h g−1 after five cycles at C/5
These can be attributed to the enhancement produced by the presence of highly conductive graphene nanoplatelets in the electrode composition. These results indicate that highly disordered carbon in the GNP structure results in a boost of the specific capacity of anodes for lithium-ion batteries
Summary
The reality of climate change has accelerated the energy transition to a more electrified society. The extraordinary reversible capacity obtained with this material is attributed to the ultrasmall particle size of Sn(OH) inside the micropores, producing a decrease of the SEI formation, accommodation of electrode expansion, and a stable cycling performance due to the encapsulation With these results, the benefits of the use of hybrid materials for anode preparation are demonstrated. Differences in the morphology and structure of graphene materials are expected to have significant impact on the properties, leading to a poor understanding and prediction of their electrochemical storage in LIBs. Further studies evidence the important role of defective/disordered graphene nanosheets in the enhancement of the reversible capacity of LIBs (Pan et al, 2009). Three commercial graphene nanoplatelets (GNPs) from Nanografi Nano Technology are used to evaluate the influence of the specific surface area on the electrochemical performance of electrodes for lithium-ion batteries. The mass loading of the active materials was taken into account to calculate the capacities
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