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Tale of Three Phosphate Additives for Stabilizing NCM811/Graphite Pouch Cells: Significance of Molecular
Huajun Zhao1,2, Yunxian Qian3, Shiguang Hu3
1Department of Materials Science and Engineering, Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen 518055, China.
ACS Applied Materials & Interfaces
|June 17, 2021
Summary
Researchers explored phosphate electrolyte additives for lithium-ion batteries (LIBs). The most unsaturated additive, tripropargyl phosphate (TPPC3), demonstrated superior performance in enhancing battery stability and protective interphases.
Area of Science:
- Materials Science
- Electrochemistry
- Chemical Engineering
Background:
- Electrolyte additives are crucial for improving lithium-ion battery (LIB) performance.
- Current additive selection relies on trial-and-error, lacking structure-performance correlations.
Purpose of the Study:
- To investigate the relationship between molecular structure and electrochemical performance of phosphate additives in LIBs.
- To reveal the significance of additive structure in forming robust interphases.
Main Methods:
- Systematic structural variation of phosphate additives (TPPC1, TPPC2, TPPC3).
- Theoretical calculations and comprehensive characterizations of interphases.
- Electrochemical performance testing at elevated temperature (55 °C).
Main Results:
- TPPC3 (alkyne) and TPPC2 (alkene) showed higher reactivity than TPPC1 (alkane).
- These additives formed dense, protective interphases on both electrodes.
- Additive effectiveness for stability correlated with unsaturation: TPPC3 > TPPC2 > TPPC1.
Conclusions:
- Additive molecular structure significantly impacts interphase formation and LIB performance.
- Unsaturated phosphate additives are more effective for enhancing cycling stability and suppressing interfacial resistance.
- This work provides a foundation for rational design of novel electrolyte components for advanced battery chemistries.
