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Stabilizing Lithium Metal Anodes by a Self-Healable and Li-Regulating Interlayer.

Ximing Cui¹, Ying Chu¹, Xiaohui Wang¹

¹State Key Laboratory of Robotics and Systems, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China.

ACS Applied Materials & Interfaces

|September 10, 2021

Summary

A novel interlayer of trifluorophenyl-modified poly(ethylene imine) (PEI-3F) effectively suppresses side reactions and dendrite growth in lithium metal anodes. This innovation enhances battery stability and performance for high-energy-density applications.

Keywords:

cycling stability dendrite depression lithium anode lithium regulation self-healable

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Area of Science:

Materials Science
Electrochemistry
Polymer Chemistry

Background:

Lithium metal anodes offer high energy density but suffer from interface instability.
Side reactions and dendrite growth impede practical application of lithium metal batteries.

Purpose of the Study:

To develop a protective interlayer for lithium metal anodes.
To address challenges of side reactions and dendrite formation at electrode/electrolyte interfaces.

Main Methods:

Synthesized a trifluorophenyl-modified poly(ethylene imine) network (PEI-3F) as an interlayer.
Utilized dynamic imine bonding for self-healing properties.
Investigated Li+ coordination and distribution adjustment by the interlayer.

Main Results:

PEI-3F interlayer demonstrated excellent cycling stability over 250 cycles in asymmetric Li||Cu cells.
Dendrite-free lithium metal anode morphology was achieved.
A lithium-sulfur cell using the modified anode retained 91% capacity after 100 cycles at high sulfur loading.

Conclusions:

The PEI-3F interlayer is a viable strategy to overcome intrinsic drawbacks of lithium metal anodes.
This approach offers a novel pathway for developing stable, high-energy-density batteries.
The self-healing interlayer concept can be extended to other light-metal electrode systems.