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Controlling Solid-Electrolyte-Interphase Layer by Coating P-Type Semiconductor NiOx on Li4Ti5O12 for
Mi Ru Jo1, Gi-Hyeok Lee1, Yong-Mook Kang1
1Department of Energy and Materials Engineering, Dongguk University-Seoul , Seoul 100-715, Republic of Korea.
ACS Applied Materials & Interfaces
|December 2, 2015
Summary
Coating lithium titanate (Li4Ti5O12) anodes with nickel oxide (NiOx) improves energy density and stability in rechargeable lithium batteries. This NiOx coating prevents electrolyte decomposition, enhancing performance across a wider voltage range.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium titanate (Li4Ti5O12) is a zero-strain anode material with excellent kinetics for lithium-ion batteries.
- However, its low energy density above 1 V vs Li+/Li limits its application.
- Operating below 1 V can cause electrolyte decomposition and excessive solid electrolyte interphase (SEI) formation.
Purpose of the Study:
- To enhance the energy density and electrochemical performance of Li4Ti5O12 in a wide voltage range.
- To investigate the effect of a p-type semiconductor NiOx coating on Li4Ti5O12 anodes.
- To understand the mechanism by which NiOx coating improves stability and reversibility.
Main Methods:
- Coating Li4Ti5O12 powder with NiOx.
- Electrochemical testing across an extended voltage window.
- Ex situ X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), and Fourier-Transform Infrared Spectroscopy (FTIR) analysis.
Main Results:
- NiOx coating effectively suppresses the electrochemical reduction of organic electrolyte components to Li2CO3 below 1 V.
- The coating promotes the formation of a stable SEI layer, enhancing charge/discharge process reversibility.
- NiOx-coated Li4Ti5O12 exhibits improved rate capability and cyclability.
Conclusions:
- NiOx coating is a viable strategy to improve the electrochemical performance of Li4Ti5O12 anodes.
- The stable SEI layer formed by NiOx coating enables wider voltage operation.
- This approach enhances the potential of Li4Ti5O12 for advanced rechargeable lithium batteries.
