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 three-dimensional 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.
Highlights
New-energy vehicles, such as electric vehicles, are essential to ease the strain on the environment resulting from fast growing consumption of fossil fuels
The pristine LFP was synthesized in the absence of graphene aerogels (GAs)
The LFP colloidal precursor is adsorbed on GA and dried at 60 °C, and calcined to produce the sandwich nanostructure composited LFP-GA electrode materials
Summary
New-energy vehicles, such as electric vehicles, are essential to ease the strain on the environment resulting from fast growing consumption of fossil fuels. The obtained LFP-GA electrode demonstrates excellent specific capacity (162 mAh g-1, 0.1 C), high rate performance (148 and 104 mAh g-1 at and 10 C) and long cyclic life (capacity retention 80.6 % after 1000 cycles at 1 C), ascribed to the unique characteristics of the composite structure: 1) The GA provides a large surface area to anchor LFP and enable the in-situ formation of LFP nanoplates along the graphene sheets, strengthening the interaction between LFP and GA; 2) GA
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