Hydrogenated Anatase TiO2 as Lithium-Ion Battery Anode: Size–Reactivity Correlation

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• 作者：Jing Zheng ; Lei Liu ; Guangbin Ji ; Qifan Yang ; Lirong Zheng ; Jing Zhang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：August 10, 2016
• 年：2016
• 卷：8
• 期：31
• 页码：20074-20081
• 全文大小：631K
• 年卷期：0
• ISSN：1944-8252

文摘

An improved hydrogenation strategy for controllable synthesis of oxygen-deficient anatase TiO₂ (H-TiO₂) is performed via adjusting the particle size of starting rectangular anatase TiO₂ nanosheets from 90 to 30 nm. The morphology and structure characterizations obviously demonstrate that the starting materials of TiO₂ nanosheets are transformed into nanoparticles with distinct size reduction; meanwhile, the concentration of oxygen vacancy is gradually increased with the decreasing particle size of starting TiO₂. As a result, the Li-storage performance of H-TiO₂ is not only much better than that of the pure TiO₂ but also elevated stage by stage with the decreasing particle size of starting TiO₂; especially the H-TiO₂ with highest concentration of oxygen vacancy from smallest TiO₂ nanosheets shows the best Li-storage performance with a stable discharge capacity 266 mAh g^–1 after 100 cycles at 1 C. Such excellent performance should be attributed to the joint action from oxygen vacancy and size effect, which promises significant enhancement of high electronic conductivity without weakening Li⁺ diffusion via hydrogenation strategy.