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Related Experiment Video

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Coin Cell Battery Chamber Design for Low-temperature Operando Experiments

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High-Accuracy and Resolution Fluorescence Intensity Ratio Thermometer for Real-Time Temperature Monitoring in a

Qian Gao¹, Xianglong Xiao¹, JianJun Huang¹

¹College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China.

Inorganic Chemistry

|March 12, 2026

Summary

This summary is machine-generated.

A novel all-fiber thermometer using enhanced upconversion luminescence monitors lithium-ion battery temperature in real-time. This high-accuracy optical sensor offers improved safety and performance for battery applications.

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

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

Published on: December 20, 2016

Area of Science:

Optical Sensing Materials
Solid-State Luminescence
Energy Storage Devices

Background:

Fluorescence intensity ratio (FIR) technology is crucial for optical sensing.
Developing high-performance temperature sensors for practical applications faces challenges.
Real-time temperature monitoring is essential for lithium-ion battery (LIB) safety and performance.

Purpose of the Study:

To construct an all-fiber FIR thermometer for real-time LIB temperature monitoring.
To enhance upconversion luminescence in Er³⁺/Yb³⁺ codoped Y₂Mo₃O₁₂ phosphors for improved sensor performance.
To investigate the application of the developed thermometer in monitoring internal LIB temperatures.

Main Methods:

Synthesized K⁺/Mg²⁺ ion codoped Er³⁺/Yb³⁺:Y₂Mo₃O₁₂ phosphors.
Fabricated an all-fiber FIR thermometer utilizing the enhanced phosphors.
Implanted the optical fiber sensing probe into a pouch LIB for in-situ temperature measurement.

Main Results:

Achieved a three orders of magnitude enhancement in upconversion luminescence.
Developed a thermometer with temperature measurement accuracy of ±0.1 K and resolution of 0.01 K.
Demonstrated a fast thermal response time of 1.14 s for a 100 K temperature difference.
Measured a maximum internal temperature rise of 25.30 K at a 5C charging rate in a 2000 mAh LIB.

Conclusions:

The developed all-fiber FIR thermometer enables high-accuracy, high-resolution, and real-time temperature monitoring of LIBs.
Material design strategies significantly improved phosphor performance for optical thermometry.
This work lays the foundation for practical utilization of ratiometric temperature sensors in battery management systems.