Hydrogenated Anatase TiO2 as Lithium-Ion Battery Anode: Size-Reactivity Correlation
Hydrogenated Anatase TiO2 as Lithium-Ion Battery Anode: Size-Reactivity Correlation
复制标题
氢化锐钛矿型 TiO2 作为锂离子电池负极：尺寸-反应性相关性
DOI：
10.1021/acsami.6b05993
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发表时间：
2016
影响因子：
9.5
通讯作者：
Zhang Jing
中科院分区：
文献类型：
--
作者：
Zheng Jing;Liu Lei;Ji Guangbin;Yang Qifan;Zheng Lirong;Zhang Jing
通过将矩形锐钛矿TiO2纳米片的粒径从90 nm调整到30 nm，提出了一种改进的氢化策略，以实现缺氧锐钛矿TiO2（H-TiO2）的可控合成。形貌和结构表征表明，tio2纳米片的起始材料转变为纳米颗粒，且粒径明显减小；同时，氧空位浓度随着起始TiO2粒径的减小而逐渐增大。结果表明，h -TiO2的储锂性能不仅明显优于纯TiO2，而且随着起始TiO2粒径的减小，h -TiO2的储锂性能逐渐提高；特别是最小的tio2纳米片中氧空位浓度最高的h - tio2，在1℃下循环100次后，放电容量稳定在266 mAh g - 1，表现出最佳的锂存储性能。这种优异的性能应归功于氧空位和尺寸效应的共同作用，在不削弱Li+通过加氢策略扩散的情况下，有望显著增强高电子导电性。
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 TiO2nanosheets from 90 to 30 nm. The morphology and structure characterizations obviously demonstrate that the starting materials of TiO2nanosheets 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-TiO2is not only much better than that of the pure TiO2but also elevated stage by stage with the decreasing particle size of starting TiO2; especially the H-TiO2with highest concentration of oxygen vacancy from smallest TiO2nanosheets shows the best Li-storage performance with a stable discharge capacity 266 mAh g–1after 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.