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Published on: November 11, 2013
Heterointerface engineering via dual modification stabilizes O3-type layered oxides cathodes for high-voltage
Wei Li1, Wei Huang1, Man Zhang2
1Guangxi Key Laboratory of Low Carbon Energy Materials, Guangxi Scientific and Technological Achievements Transformation Pilot Research Base of Electrochemical Energy Materials and Devices, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China.
Researchers developed a tin (Sn) doping and tin selenide (SnSe2) coating strategy to improve the stability of sodium-ion battery cathodes. This method enhances cycling performance and mitigates structural degradation for better energy storage applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- O3-type layered sodium-based oxide cathodes are promising for sodium-ion batteries due to high theoretical capacity.
- Complex phase transitions and oxygen loss hinder their cycling stability and large-scale application.
Purpose of the Study:
- To design a surface modification strategy to suppress phase transitions and oxygen evolution in O3-type cathodes.
- To enhance the cycling performance and structural stability of sodium-ion battery cathodes.
Main Methods:
- Developed a dual modification strategy involving tin (Sn) bulk doping and SnSe2 coating.
- Investigated the effects of Sn4+ substitution on transition metal layer contraction and interlayer spacing.
- Utilized SnSe2 coating to form a heterostructure interface, stabilizing the lattice oxygen.
Main Results:
- Sn doping and SnSe2 coating effectively suppressed transition metal layer sliding and lattice oxygen evolution.
- The modified cathode showed enhanced cycling stability, retaining 71% capacity after 500 cycles at 1C (2.0-4.0 V).
- Superior high-voltage performance was observed, with 62.4% capacity retention after 200 cycles at 4.3 V.
Conclusions:
- The SnSe2 coating/Sn-bulk doping strategy concurrently stabilizes the bulk structure and interface of O3-type cathodes.
- This approach significantly improves cycling stability and high-voltage performance for sodium-ion batteries.
- The strategy shows potential for application in other advanced energy storage materials.
