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Carbon-Doped TiNb2O7 Suppresses Amorphization-Induced Capacity Fading
Woowon Chung1, Jin Ho Bang2,3
1Department of Bionano Technology, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea.
ACS Applied Materials & Interfaces
|April 25, 2022
Summary
Titanium niobium oxide (TNO) shows promise for batteries but fades quickly. Amorphization causes capacity loss, but carbon doping can improve stability by reducing impedance, offering a potential solution for better battery performance.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Graphite anodes have limited capacity for high-performance batteries.
- Titanium niobium oxide (TNO) is a promising alternative anode material with high capacity.
- The electrochemical behavior and capacity fading mechanisms of TNO are not well understood.
Purpose of the Study:
- To investigate the factors governing capacity fading in TNO.
- To elucidate the mechanism responsible for TNO's poor long-term cycling stability.
- To explore strategies for improving TNO's electrochemical performance.
Main Methods:
- Investigated the electrochemical behavior of TNO under cycling conditions.
- Analyzed structural changes and impedance evolution during lithiation/delithiation.
- Evaluated the effect of nanostructuring and carbon doping on TNO stability.
Main Results:
- Structural weakness and amorphization drive TNO capacity fading and impedance increase.
- Nanostructuring improves intercalation kinetics but exacerbates capacity fading.
- Carbon doping effectively suppresses impedance rise despite amorphization.
Conclusions:
- The structural instability and amorphization of TNO are critical limitations for battery applications.
- Carbon doping presents a viable strategy to mitigate capacity fading and enhance the cycling stability of TNO anodes.
