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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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Surface Oxygen Vacancy Inducing Li-Ion-Conducting Percolation Network in Composite Solid Electrolytes for
Heejun Yun1, Jinil Cho1, Seokgyu Ryu2
1Program in Nano Science and Technology, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, 08826, Republic of Korea.
Small (Weinheim an Der Bergstrasse, Germany)
|February 22, 2023
Summary
Composite solid electrolytes (CSEs) show improved ionic conductivity in all-solid-state lithium-metal batteries. Oxygen vacancies in indium tin oxide nanoparticles create a Li-ion conducting pathway, enhancing battery performance.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- Composite solid electrolytes (CSEs) offer improved processability and electrode compatibility for all-solid-state lithium-metal batteries.
- CSEs exhibit higher ionic conductivity than solid polymer electrolytes (SPEs) due to inorganic filler incorporation.
- The Li-ion conduction mechanism and pathway in CSEs remain unclear, hindering advancement.
Purpose of the Study:
- To elucidate the dominant role of oxygen vacancies (Ovac) in inorganic fillers on the ionic conductivity of CSEs.
- To establish a Li-ion conducting percolation network model.
- To investigate the effect of Ovac concentration on CSE ionic conductivity.
Main Methods:
- Density functional theory (DFT) calculations to select indium tin oxide nanoparticles (ITO NPs) as inorganic fillers.
- Development of a Li-ion-conducting percolation network model.
- UV-ozone treatment to modify Ovac concentration in ITO NPs.
Main Results:
- A Li-ion-conducting percolation network is formed via Ovac on the ITO NP-polymer interface, significantly boosting ionic conductivity.
- LiFePO4/CSE/Li cells demonstrated excellent long-term cycling stability, retaining 154 mAh g-1 at 0.5C after 700 cycles.
- Direct verification of the dependence of CSE ionic conductivity on surface Ovac concentration of inorganic fillers.
Conclusions:
- Oxygen vacancies in inorganic fillers play a critical role in enabling fast Li-ion conduction in CSEs.
- The Ovac-induced percolation network is key to achieving high ionic conductivity and stable cycling in all-solid-state batteries.
- Surface Ovac engineering offers a viable strategy to tune and enhance the performance of CSEs.
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