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$In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries$

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Sustained Release-Driven Interface Engineering Enables Fast Charging Lithium Metal Batteries.

Yu You¹, Haofan Duan¹, Hongming Tan¹

¹Hunan Provincial Key laboratory of Thin Film Materials and Devices, School of Material Sciences and Engineering, Xiangtan University, Xiangtan, 411105, China.

Small (Weinheim an Der Bergstrasse, Germany)

|January 22, 2024

Summary

This summary is machine-generated.

A new composite layer (PML) enhances lithium nitrate

Keywords:

electrochemical performances lithium metal batteries nitrogen‐containing species polymer‐based protective layer uniform lithium deposition

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Lithium nitrate (LiNO₃) is a promising electrolyte additive for stabilizing lithium metal batteries by forming protective Li₃N and LiN_xO_y species.
Limited solubility of LiNO₃ in carbonate electrolytes hinders its application in high-voltage lithium metal batteries.

Purpose of the Study:

To develop a strategy to overcome the solubility limitations of LiNO₃ in carbonate electrolytes for high-voltage lithium metal batteries.
To improve the interfacial stability and lithium deposition behavior using a composite layer on the lithium metal anode.

Main Methods:

Designed an artificial composite layer (PML) comprising LiNO₃ and PMMA on the lithium metal surface.
Investigated the role of the PML layer as a reservoir for gradual LiNO₃ release.
Analyzed the PMMA matrix's contribution to ionic conductivity and lithium ion migration.

Main Results:

Achieved stable and dendrite-free lithium plating/stripping at ultrahigh current densities (20 mA cm^-2) and large areal capacities (10 mAh cm^-2).
Demonstrated stable cycling for over 2000 cycles in a Li||LiFePO₄ full cell with 94.8% capacity retention.
The PML layer effectively regulated lithium deposition and enhanced interfacial stability.

Conclusions:

The facile strategy of creating a PML composite layer successfully addresses the solubility issue of LiNO₃ in carbonate electrolytes.
This approach enables the practical application of LiNO₃ for stable and high-performance lithium metal batteries.