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  4. TAILORING ASSEMBLY OF LITHIATED GRAPHENE BY AIR-CONTROLLED ELECTROSPRAY FOR LITHIUM METAL BATTERY ANODE

TAILORING ASSEMBLY OF LITHIATED GRAPHENE BY AIR-CONTROLLED ELECTROSPRAY FOR LITHIUM METAL BATTERY ANODE

File(s)
Gao_cornell_0058O_11850.pdf (16.96 MB)
Permanent Link(s)
https://doi.org/10.7298/p95t-jg73
https://hdl.handle.net/1813/114538
Collections
Cornell Theses and Dissertations
Author
Gao, Ziang
Abstract

Lithium metal batteries (LMBs) are rechargeable battery systems that use a lithium metal anode along with intercalation or conversion-type cathodes. The high specific capacity and low electrochemical potential of lithium metal make LMBs a promising solution for thinner and lighter energy-storage systems. However, the widespread use of lithium metal anodes is hindered by issues such as uneven dendritic deposition and fragile solid electrolyte interface (SEI) formation. To address these challenges, this study explores the use of graphene as a substrate to stabilize lithium deposition. Specifically, two different graphene assemblies, layered and crumpled, are successfully fabricated on a copper current collector using an air-controlled electrospray process. Electrochemical tests demonstrate that both graphene structures effectively stabilize lithium deposition. Especially, the crumpled graphene structure maintains 98.3% Coulombic efficiency (CE) for 300 cycles in a half-cell configuration with a carbonate electrolyte. Furthermore, coupling the lithiated graphene anode with an NMC811 cathode in a full-cell battery under low negative/positive capacity ratio conditions results in improved anode stability over longer cycles.

Description
66 pages
Date Issued
2023-08
Keywords
Anode
•
Battery
•
Lithium Metal
Committee Chair
Joo, Yong
Committee Member
Suntivich, Jin
Hanrath, Tobias
Degree Discipline
Chemical Engineering
Degree Name
M.S., Chemical Engineering
Degree Level
Master of Science
Type
dissertation or thesis
Link(s) to Catalog Record
https://newcatalog.library.cornell.edu/catalog/16219431

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