Journal
ELECTROCHIMICA ACTA
Volume 320, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.134566
Keywords
Sandwich nanostructure; Porous nanoplate; Graphene aerogel; LiFePO4
Categories
Funding
- National Natural Science Foundation of China [51372178, 51602234]
- Natural Science Foundation of Hubei Province of China [2013CFA021, 2017CFB401, 2018CFA022]
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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. (C) 2019 Elsevier Ltd. All rights reserved.
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