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Fast-Charging Cathodes from Polymer-Templated Mesoporous LiVPO4F.
Terri C Lin1, Yan Yan1, Sophia C King1
1Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States.
ACS Applied Materials & Interfaces
|July 2, 2020
Summary
Researchers developed carbon-coated nanoporous lithium vanadium phosphate fluoride (LiVPO4F) for fast-charging lithium-ion batteries. This material demonstrates high operating voltage and excellent stability, crucial for advanced energy storage solutions.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- High operating voltage cathodes are essential for high energy and power density lithium-ion batteries.
- Nanoporous materials offer potential for fast-charging but often require high synthesis temperatures.
Purpose of the Study:
- To synthesize carbon-coated nanoporous LiVPO4F for fast-charging applications.
- To evaluate the electrochemical performance and stability of the synthesized material.
Main Methods:
- Synthesis of carbon-coated nanoporous LiVPO4F.
- Electrochemical cycling at various C-rates (1C, 20C, 30C).
- Open-circuit voltage and self-discharge measurements.
- Fabrication and testing of a proof-of-concept full cell with nanostructured Nb2O5.
- Operando X-ray diffraction and electrochemical kinetics analysis.
Main Results:
- Achieved stable cycling up to 4.6 V with LiPF6 electrolytes.
- Delivered 110 mAh/g at 30C (70% theoretical capacity) with only 9% capacity loss after 2000 cycles at 20C.
- Exhibited excellent stability with minimal self-discharge (139 mAh/g after 12h at 4.2 V).
- Full cell demonstrated 200 mAh/g at 1C and 100 mAh/g at 30C.
Conclusions:
- Carbon-coated nanoporous LiVPO4F is a promising cathode material for fast-charging lithium-ion batteries.
- The material exhibits high rate capabilities, excellent cycling stability, and good voltage stability.
- Operando studies provided insights into the fast-charging mechanisms.
