Polaron inhibited α-trizinc bis-phosphate(v) as low potential polyanionic negative electrode for lithium-ion batteries

This work explores polyanionic phosphate-type α-Zn3(PO4)2 (ZP) as a negative electrode in lithium-ion batteries. It has a high theoretical capacity of 278 mA h g−1. The crystal structure of ZP is elucidated, and Patterson's electron density profiling is performed to understand the possible site...

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Bibliographic Details
Published in:Applied physics letters 2024-09, Vol.125 (10)
Main Authors: Sasirajan Littleflower, Sajan Raj, Dhanapal, Vaishnavi, Ramakrishnan, Saraswathi, Hanamantrao, Desai Prashant, Kumar, Karthick, Lee, Chang Woo, Vediappan, Kumaran
Format: Article
Language:English
Subjects:
Carbon
Coating effects
Crystal structure
Diffusion coating
Diffusion coefficient
Discharge
Electrical insulation
Electrochemical analysis
Electrodes
Electron density profiles
Lithium-ion batteries
Low temperature
Polarons
Titration
Zinc phosphate
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Summary:This work explores polyanionic phosphate-type α-Zn3(PO4)2 (ZP) as a negative electrode in lithium-ion batteries. It has a high theoretical capacity of 278 mA h g−1. The crystal structure of ZP is elucidated, and Patterson's electron density profiling is performed to understand the possible site of lithiation. To address the polaron-driven electrical insulation common to phosphates, we use superficial carbon coating (ZP/C). Furthermore, the electrochemical analysis of ZP and ZP/C is performed to validate the half-cell performance and Li+ kinetics. ZP/C delivers a high capacity of 260 mA h g−1 at 0.1 C. The positive effect of carbon coating is evident from a 100-fold increase in lithium diffusion coefficient from the galvanostatic intermittent titration technique. In addition, temperature-driven capacity performance is analyzed at −10, 25, and 50 °C. Temperature gradient charge–discharge is performed between −10 and −5 °C, where the discharge capacity increases from 70 to 100 mA h g−1 at 1 C rate, extending the application toward low-temperature non-carbonaceous energy storage solutions.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0225880