A rationally assembled graphene nanoribbon/graphene framework for high volumetric energy and power density Li-ion batteriesElectronic supplementary information (ESI) available. See DOI: 10.1039/c8nr00692j
High volumetric energy and power densities are crucial for Li-ion batteries, which are however hindered by the loose structure and/or insufficient conductivity of conventional electrode laminates. Herein, an efficiently conductive framework of graphene nanoribbons (GNRs) and graphene (G) is rational...
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Main Authors | , , , , , |
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Format | Journal Article |
Language | English |
Published |
26.04.2018
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Online Access | Get full text |
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Summary: | High volumetric energy and power densities are crucial for Li-ion batteries, which are however hindered by the loose structure and/or insufficient conductivity of conventional electrode laminates. Herein, an efficiently conductive framework of graphene nanoribbons (GNRs) and graphene (G) is rationally constructed to wrap LiFePO
4
(LFP) into a binder-free dense electrode by a coupling technique of spray deposition and vacuum filtration. The spray ensures a uniform mixing of LFP, G and GNRs, meanwhile the vacuum filtration leads to a dense packing of the mixture. With only 2 wt% of G and GNRs, the LFP/GNR/G electrode delivers a high rate capability and a stable (dis)charge cycling performance under high LFP loading conditions. Moreover, the dense LFP/GNR/G electrode exhibits superior volumetric properties among all the reported LFP electrodes on the basis of the entire electrode volume, including a Li storage capacity of 318 A h L
−1
, an energy density of 1020 W h L
−1
and a power density of 5.1 kW L
−1
at 5C rate. This unique assembly strategy and the electrode structure pave a new way for high-volumetric-performance batteries.
A high volumetric performance electrode LFP/GNR/G is assembled by a coupling technique of "spray deposition + vacuum filtration" for Li-ion batteries. |
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Bibliography: | 10.1039/c8nr00692j Electronic supplementary information (ESI) available. See DOI |
ISSN: | 2040-3364 2040-3372 |
DOI: | 10.1039/c8nr00692j |