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Updated: Jul 12, 2025
Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
Improving dual electrodes compatibility through tailoring solvation structures enabling high-performance and
Yuzhi Chen1, Boliang Ma1, Qingchuan Wang1
1School of Chemistry, Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, "Four Joint Subjects One Union" School-Enterprise Joint Research Center for Power Battery Recycling & Circulation Utilization Technology, Xi'an Jiaotong University, Xi'an 710049, China.
A new localized high-concentration electrolyte (LHCE) enhances low-temperature performance in lithium-ion phosphate (LFP) batteries. This electrolyte stabilizes dual electrodes, improving cycling stability and capacity at sub-zero temperatures.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Lithium iron phosphate (LFP) batteries offer good stability and energy density but suffer from poor low-temperature performance.
- Commercial electrolytes fail to stabilize both electrodes in Li||LFP batteries at low temperatures due to interfacial issues and slow kinetics.
Purpose of the Study:
- To develop a novel localized high-concentration electrolyte (LHCE) for improved dual-electrode compatibility in low-temperature Li||LFP batteries.
- To elucidate the mechanisms behind LHCE's co-stabilization effects on electrodes at low temperatures.
Main Methods:
- Formulation of a localized high-concentration electrolyte (LHCE) using FSI- anions.
- Investigation of solvation structures and interfacial passivation layer formation via electrochemical analysis.
- Performance evaluation of Li||LFP batteries with LHCE under various low-temperature conditions.
Main Results:
- LHCE forms anion-dominated solvation structures, suppressing solvent decomposition and creating inorganic-rich passivation layers.
- The LHCE exhibits a low freezing point (-99.8 °C), high ionic conductivity (2.4 mS cm⁻¹ at -40 °C), and high voltage stability (>4.7 V).
- Li||LFP batteries with LHCE demonstrate excellent cyclic stability (120 mAh g⁻¹ over 300 cycles at -20 °C) and superior performance under practical conditions.
Conclusions:
- The developed LHCE effectively stabilizes dual electrodes in Li||LFP batteries at low temperatures.
- LHCE offers a promising solution for enhancing the low-temperature electrochemical performance of LFP batteries.
