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Updated: May 12, 2025

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

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Published on: December 20, 2016

Constructing Dissolution-Resistant Interphases for Long-Life Sodium-Ion Batteries at Elevated Temperatures.

Wenting Deng^1,2,3,4, Xiaofan Du^2,3,4, Gaojie Xu^2,3,4

¹College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|May 9, 2025

Summary

A new additive, sodium difluorobis(oxalato) phosphate (NaDFBOP), improves the high-temperature performance of sodium-ion batteries (SIBs). This enhances cycle life by creating stable interphase layers, crucial for commercialization.

Keywords:

carbonate electrolyte dissolution–resistant interphase elevated temperature functional additive sodium‐ion batteries

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Rechargeable sodium-ion batteries (SIBs) face challenges with poor cycle life at elevated temperatures.
Instability of interphase layers, particularly NaF solubility in carbonate solvents, limits SIB performance.

Purpose of the Study:

To enhance the elevated temperature cycle life of commercial SIBs.
To investigate the effect of a novel additive, sodium difluorobis(oxalato) phosphate (NaDFBOP), on SIB performance.

Main Methods:

Synthesis of NaDFBOP and its introduction into NaPF6-carbonate electrolytes.
Electrochemical testing of NaNi1/3Fe1/3Mn1/3O2 (NFM)/hard carbon (HC) SIBs at 30°C and 50°C.
Theoretical calculations and material characterizations to analyze interphase layer formation.

Main Results:

NaDFBOP addition significantly improved cycle life, retaining 85.45% capacity after 1000 cycles at 30°C and 90.76% after 500 cycles at 50°C.
Theoretical calculations showed DFBOP⁻ anions interact with Na⁺ and NaDFBOP decomposes readily.
Characterizations revealed NaDFBOP promotes robust, dissolution-resistant interphase layers with oxalate-containing species and NaF.

Conclusions:

Designing functional additives is critical for improving SIB elevated temperature cycle life.
NaDFBOP effectively constructs dissolution-resistant interphases, enhancing SIB stability and longevity.