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Title: Wrinkled Graphene Cages as Hosts for High-Capacity Li Metal Anodes Shown by Cryogenic Electron Microscopy

Journal Article · · Nano Letters

Lithium (Li) metal has long been considered the “holy grail” of battery anode chemistry but is plagued by low efficiency and poor safety due to its high chemical reactivity and large volume fluctuation, respectively. Here we introduce a new host of wrinkled graphene cage (WGC) for Li metal. Different from recently reported amorphous carbon spheres, WGC show highly improved mechanical stability, better Li ion conductivity, and excellent solid electrolyte interphase (SEI) for continuous robust Li metal protection. At low areal capacities, Li metal is preferentially deposited inside the graphene cage. Cryogenic electron microscopy characterization shows that a uniform and stable SEI forms on the WGC surface that can shield the Li metal from direct exposure to electrolyte. With increased areal capacities, Li metal is plated densely and homogeneously into the outer pore spaces between graphene cages with no dendrite growth or volume change. As a result, a high Coulombic efficiency (CE) of ~98.0% was achieved under 0.5 mA/cm2 and 1–10 mAh/cm2 in commercial carbonate electrolytes, and a CE of 99.1% was realized with high-concentration electrolytes under 0.5 mA/cm2 and 3 mAh/cm2. Full cells using WGC electrodes with prestored Li paired with Li iron phosphate showed greatly improved cycle lifetime. With 10 mAh/cm2 Li metal deposition, the WGC/Li composite anode was able to provide a high specific capacity of ~2785 mAh/g. Furthermore, with its roll-to-roll compatible fabrication procedure, WGC serves as a highly promising material for the practical realization of Li metal anodes in next-generation high energy density secondary batteries.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1507152
Journal Information:
Nano Letters, Vol. 19, Issue 2; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 162 works
Citation information provided by
Web of Science

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Cited By (10)

Facile Patterning of Laser‐Induced Graphene with Tailored Li Nucleation Kinetics for Stable Lithium‐Metal Batteries journal August 2019
A Game Changer: Functional Nano/Micromaterials for Smart Rechargeable Batteries journal August 2019
High-energy long-cycling all-solid-state lithium metal batteries enabled by silver–carbon composite anodes journal March 2020
Wrinkled two-dimensional ultrathin Cu( ii )-porphyrin framework nanosheets hybridized with polypyrrole for flexible all-solid-state supercapacitors journal January 2019
3D lithiophilic–lithiophobic–lithiophilic dual-gradient porous skeleton for highly stable lithium metal anode journal January 2020
Electrodeposition Technologies for Li‐Based Batteries: New Frontiers of Energy Storage journal September 2019
Stable Nano‐Encapsulation of Lithium Through Seed‐Free Selective Deposition for High‐Performance Li Battery Anodes journal January 2020
Safety Issues in Lithium Ion Batteries: Materials and Cell Design journal July 2019
A Coaxial‐Interweaved Hybrid Lithium Metal Anode for Long‐Lifespan Lithium Metal Batteries journal August 2019
Lithium Metal Anode Materials Design: Interphase and Host journal October 2019

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