China team uses ultra-thin indium sheet to stabilize Li-metal anode

Researchers from Tsinghua University and China University of
Geosciences have used an ultrathin indium sheet to construct a
stabilized lithium-rich hybrid anode with fast interfacial ion
transport. The artificial alloy layer demonstrates an enhanced
ionic conductivity with an order of magnitude higher than that of
the pristine solid electrolyte interphase.

An open-access paper on their work is published in the RSC
journal Chemical Communications.

Increasingly high attention has been paid on the development of
high energy-density rechargeable lithium metal batteries in recent
times due to the highest theoretical capacity and the lowest
standard electrode potential (Cap=3860 mAh g-1, E=-3.040 V) of
metallic lithium anode. Unfortunately, one of the major barrier
impeding the practical implementation of the metallic lithium
anodes is the dendritic structure formation, ascribed to the
denounced mass and charge transfer across the lithium/electrolyte
interphase with uneven lithium metal electrodeposition. Thus, the
platted fresh lithium tends to react instantaneously with liquid
electrolyte since lithium is thermodynamically unstable against
organic solvents. Therefore, more parasitic reaction and
electrolyte consumption can come about in the subsequent continual
cycling and results in low Coulombic efficiency (CE) and raises
safety issues.

To meet the demand of high energy density Li- O2 and Li-S
rechargeable batteries performing at room temperature, advanced
metallic lithium anode is required with dendrite suppression.

Here, an ultrathin indium sheet was fabricated and used to
construct a lithium-rich Li-In hybrid anode by a facile superficial
alloying. The alloying process between indium and metallic lithium
is fast and spontaneous due to the larger electronegativity
difference. The ultrathin indium sheet was obtained by a simple
rolling method. Specifically, the artificial interphase protects
the lithium metal against the parasitic reactions and provides a
compliant layer to accommodate the volume change of electrode
caused by the alloying and platting processes.

—Sun et al.

In the study, the team used 1M LiPF6in ethylene
carbonate-dimethyl carbonate (EC/DMC) solvent for the liquid
electrolyte.

With a reduced diffusion barrier and improved charge transfer at
the artificial interface, the hybrid anode realized the uniform
lithium electrodeposition and considerable dendrite
suppression.

Coupled with LiNi5Co3Mn2O2 (NCM-532) cathodes, this hybrid anode
shows an impressive reversibility, with 90% retention after 120
cycles.

Resources

  • Bin Sun, Jialiang Lang, Kai Liu, Naveed Hussain, Minghao Fang
    and Hui Wu (2019) “Promoting a highly stable lithium metal anode
    by superficial alloying with an ultrathin indium sheet” Chem.
    Commun.
    doi: 10.1039/C8CC08934E

Source: FS – Transport 2
China team uses ultra-thin indium sheet to stabilize Li-metal anode



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