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Multifunctional Acetamide Additive Combined with LiNO3 Co-Assists Low-Concentration Electrolyte Interfacial Stability
Yongchao Liu1, Jirui Wang1, Shengge Rong2
1School of Materials Science and Engineering, Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices, Hefei University of Technology, Hefei, Anhui 230009, P. R. China.
ACS Applied Materials & Interfaces
|November 8, 2023
Summary
Multifunctional acetamide (MTA) and lithium nitrate additives stabilize low-concentration electrolytes (LCEs) in lithium metal batteries (LMBs). This dual additive approach suppresses dendrites and enhances battery performance and longevity.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium metal batteries (LMBs) offer high energy density but face challenges with lithium dendrites and electrode-electrolyte interface instability.
- Low-concentration electrolytes (LCEs) reduce costs but exacerbate interface issues, hindering practical LMB applications.
Purpose of the Study:
- To enhance the stability and performance of LMBs utilizing LCEs.
- To investigate the synergistic effect of novel additives in LCEs for improved lithium metal anode protection.
Main Methods:
- Introduction of multifunctional acetamide (N-methyl-N-(trimethylsilyl)-trifluoroacetamide, MTA) and lithium nitrate (LiNO3) as co-additives in LCEs.
- Analysis of electrolyte stability, interphase layer formation, and electrochemical performance of Li||NMC811 batteries.
Main Results:
- MTA effectively scavenges water and HF, stabilizing LCEs and suppressing salt decomposition.
- The MTA and LiNO3 combination constructs an inorganic-rich interphase, suppressing lithium dendrites and reducing interfacial impedance.
- Li||NMC811 batteries with additives maintained 110 mA h g⁻¹ after 500 cycles, significantly outperforming reference batteries.
Conclusions:
- The synergistic use of MTA and LiNO3 is a cost-effective strategy to enhance the stability and cycle life of LMBs in LCEs.
- This approach offers a promising pathway for the practical application of high-energy-density lithium metal batteries.
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