期刊
CHEMSUSCHEM
卷 14, 期 1, 页码 398-407出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202002229
关键词
batteries; lithium; hybrid material; mechanochemistry; titanium niobium oxide
资金
- COSH-CDC project by the German Research Foundation (DFG, Deutsche Forschungsgemeinschaft) [PR-1173/5]
- Federal Ministry of Education and Research (Bundesministerium fur Bildung und Forschung, BMBF) [03SF0498]
- Projekt DEAL
This work presents a facile and scalable two-step synthesis method for preparing Ti2Nb10O29 (TNO)/carbon hybrid material as a promising anode for lithium-ion batteries. The hybrid material exhibited high specific capacity, excellent cycling stability, and improved rate handling due to the addition of carbon.
This work introduces the facile and scalable two-step synthesis of Ti2Nb10O29 (TNO)/carbon hybrid material as a promising anode for lithium-ion batteries (LIBs). The first step consisted of a mechanically induced self-sustaining reaction via ball-milling at room temperature to produce titanium niobium carbide with a Ti and Nb stoichiometric ratio of 1 to 5. The second step involved the oxidation of as-synthesized titanium niobium carbide to produce TNO. Synthetic air yielded fully oxidized TNO, while annealing in CO2 resulted in TNO/carbon hybrids. The electrochemical performance for the hybrid and non-hybrid electrodes was surveyed in a narrow potential window (1.0-2.5 V vs. Li/Li+) and a large potential window (0.05-2.5 V vs. Li/Li+). The best hybrid material displayed a specific capacity of 350 mAh g(-1) at a rate of 0.01 A g(-1) (144 mAh g(-1) at 1 A g(-1)) in the large potential window regime. The electrochemical performance of hybrid materials was superior compared to non-hybrid materials for operation within the large potential window. Due to the advantage of carbon in hybrid material, the rate handling was faster than that of the non-hybrid one. The hybrid materials displayed robust cycling stability and maintained ca. 70 % of their initial capacities after 500 cycles. In contrast, only ca. 26 % of the initial capacity was maintained after the first 40 cycles for non-hybrid materials. We also applied our hybrid material as an anode in a full-cell lithium-ion battery by coupling it with commercial LiMn2O4.
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