Design guidelines to use optical fibers as state of charge sensors: an operando micro wide and small angle X-ray scattering study of an IR-fiber equipped smart Na-ion battery

January 1, 2026EES batteries.Open Access

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Key Points

This research aims to identify biases in state of charge determination in fiber-equipped Na-ion batteries using optical fibers.
Operando scanning X-ray diffraction of Na-ion battery
Assessment of optical fiber performance in charge detection
Evaluation of various design guidelines for optical fibers
Identified significant biases in state of charge readings using optical fibers
Demonstrated the need for optimized fiber design to improve accuracy
Outlined specific recommendations for future optical fiber applications in batteries

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Operando analysis reveals biases in state of charge detection using optical fibers in Na-ion batteries, suggesting the need for design improvements.

Operando scanning X-ray diffraction on a fiber-equipped Na-ion battery reveals biases in state of charge determination using optical fibers.

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Yang et al. (2026) studied this question.

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