Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 25, Pages 29500-29510Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c04135
Keywords
functionalized GO; Li metal pouch cell; high Li-ion conductivity; artificial interface; lithium metal anode
Funding
- National Key R&D Program of China [2016YFF0204302]
- National Natural Science Foundation of China [51872305, 52001320]
- Key R&D Program of Zhejiang Province [2018C01049]
- S&T Innovation 2025 Major Special Program of Ningbo [2018B10081]
- China Postdoctoral Science Foundation [2019TQ0331, 2019M662123]
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In this study, a Li-functionalized graphene oxide (GO-ADP-Li-3) was used as a functional additive to improve the Li-ion conductivity of a polymer artificial interface based on PVDF-HFP/LiTFSI. This modified polymer artificial interface on Li foil showed highly reversible Li stripping/plating performance.
The fragile electrolyte/Li interface is responsible for the long-lasting consumption of Li resources and fast failure of Li metal batteries. The polymer artificial interface with high mechanical flexibility is a promising candidate to maintain the stability of the electrolyte/Li interface; however, sluggish Li-ion transportation of the conventional polymer interface hinders the application. In this work, Li-functionalized graphene oxide (GO-ADP-Li-3), which is synthesized by covalent grafting of adenosine 5'-diphosphate lithium on GO nanosheets, is used as a functional additive to improve the Li-ion conductivity of the polymer artificial interface based on PVDF-HFP/LiTFSI. The enhanced Li-ion conductivity is contributed by accelerated Li-ion hopping at the surface between polymer chains and functionalized GO as well as the reduced crystallization degree of PVDF-HFP by this novel additive. The use of this modified polymer as an artificial interface on Li foil enables highly reversible Li stripping/plating and a high capacity retention of 78.4% after 150 cycles for a 0.2 A h Li metal pouch cell (Li/NCM811, strictly following practical conditions). This Li-grafted strategy on GO sheets provides an alternative for designing a compatible electrolyte/Li interface for practical Li metal batteries.
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