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Enhancing capacity and transport kinetics of C@TiO2core-shell composite anode by phase interface engineering
Tianyu Tang1,2, Zhonggui Sun1,2, Xiangyu Bi1,2
1Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Lanzhou University, Lanzhou, 730000, People's Republic of China.
Nanotechnology
|October 6, 2021
Summary
Phase interface engineering in carbon/titanium dioxide (C/TiO2) nanocomposite anodes significantly enhances lithium-ion battery performance. Creating more interfaces boosts specific capacity and ion diffusion, proving this a viable strategy for advanced battery materials.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Nanocomposite electrodes leverage synergistic effects and phase interfaces for improved electrochemical properties.
- Understanding the role of phase interfaces in nanocomposites is crucial but underdeveloped.
- Carbon/titanium dioxide (C/TiO2) core-shell anodes are of significant scientific and industrial interest.
Purpose of the Study:
- To mechanistically understand the phase interface effect in C@TiO2 core-shell nanocomposite anodes.
- To investigate how manipulating phase interfaces impacts electrochemical performance.
- To demonstrate phase interface engineering as a strategy for enhancing lithium-ion battery anodes.
Main Methods:
- Fabrication and characterization of amorphous carbon, anatase TiO2, and C@anatase-TiO2 nanocomposite electrodes.
- Synthesis of C@anatase/rutile-TiO2 via heat treatment of C@anatase-TiO2.
- Electrochemical testing including specific capacity, Li-ion diffusion coefficient, and rate capability measurements.
Main Results:
- C@anatase-TiO2 exhibited higher specific capacity (316.5 mAh g-1) and Li-ion diffusion (4.0 × 10-14 cm2s-1) than individual components.
- Heat treatment to form C@anatase/rutile-TiO2 created additional C/TiO2 interfaces, further boosting performance.
- C@anatase/rutile-TiO2 achieved a specific capacity of 409.4 mAh g-1 and excellent rate capability (368.6 mAh g-1 at 444 mA g-1).
Conclusions:
- The C/TiO2 phase interface plays a critical role in enhancing the electrochemical properties of nanocomposite anodes.
- Phase interface engineering, particularly through controlled phase transformations, is an effective strategy to boost anode performance.
- The developed C@anatase/rutile-TiO2 material demonstrates significant potential for advanced lithium-ion battery applications.
