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Thickness Dependency of Battery Anode Properties in Multilayer Graphene
Taisei Suzuki1, Hiromasa Murata2, Yuya Kado3
1Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8573, Japan.
ACS Applied Materials & Interfaces
|November 16, 2022
Summary
Researchers developed a low-temperature layer exchange technique to create thick multilayer graphene (MLG) anodes for thin-film batteries. Thicker MLG demonstrated improved capacity and stability, paving the way for better rechargeable batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Multilayer graphene (MLG) is a promising anode material for thin-film batteries.
- Fabricating thick MLG on various substrates at low temperatures remains a challenge.
Purpose of the Study:
- To develop a low-temperature fabrication technique for thick MLG on arbitrary substrates.
- To evaluate the anode properties of MLG produced via this method.
Main Methods:
- Utilized a layer exchange (LE) technique to form MLG with controlled thickness (25-500 nm) on tantalum (Ta) foil at low temperatures.
- Conducted charge/discharge characterization using coin-type cells.
- Analyzed the MLG/Ta interface using cross-sectional transmission electron microscopy.
Main Results:
- The LE technique successfully produced uniform MLG with thicknesses up to 500 nm.
- Electrochemical performance, including capacity, increased with MLG thickness due to enhanced lithium intercalation.
- A minor metal oxide layer at the MLG/Ta interface showed limited lithium capacity.
- 500 nm MLG exhibited superior Coulombic efficiency and capacity retention compared to high-temperature-formed graphite.
Conclusions:
- The low-temperature LE technique is effective for fabricating thick MLG anodes for thin-film batteries.
- MLG thickness is a critical factor for optimizing anode performance.
- This method offers a pathway for developing cost-effective and stable rechargeable thin-film batteries.
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