Zhu Jiakun, Shen Huahai, Shi Xiaobo, Yang Fei, Hu Xiangsheng, Zhou Weidong, Yang Hui, Gu Meng
Department of Materials Science and Engineering , Guangdong Provincial Key Laboratory of Energy Materials for Electric Power , No. 1088 Xueyuan Blvd. , Shenzhen , Guangdong 518055 , China.
Department of Mechanics , Huazhong University of Science and Technology , Wuhan , Hubei 430074 , China.
Anal Chem. 2019 Sep 3;91(17):11055-11062. doi: 10.1021/acs.analchem.9b01571. Epub 2019 Aug 15.
Layer-structured vanadium oxide (VO) nanoribbons with efficient electron transport and short lithium ion insertion lengths are promising candidates for high-performance lithium-ion battery applications. Despite the extensive investigation of its electrochemical properties, the chemical and structural evolution during lithiation-delithiation processes has rarely been characterized in real time. Herein, the lithiation-delithiation behaviors of VO nanoribbons are probed by in situ transmission electron microscopy. We reveal that the VO nanoribbons exhibit high lithiation speed (0.8 nm/s) without retardation along the [010] direction and can be fully lithiated to the LiVO phase. Fully reversible retraction of lithium is observed in these VO nanoribbons during delithiation. The lithiation process accompanying the coherent strain is further simulated by our phase field model. The simulation results reveal that the specific rough lithiation interface between the VO and LiVO phases originates from the lithiation inhomogeneity.
具有高效电子传输和短锂离子插入长度的层状氧化钒（VO）纳米带是高性能锂离子电池应用的有前途的候选材料。尽管对其电化学性质进行了广泛研究，但在锂化-脱锂过程中的化学和结构演变很少被实时表征。在此，通过原位透射电子显微镜探测VO纳米带的锂化-脱锂行为。我们发现VO纳米带沿[010]方向表现出高锂化速度（0.8 nm/s）且无阻碍，并且可以完全锂化为LiVO相。在脱锂过程中，在这些VO纳米带中观察到锂的完全可逆收缩。我们的相场模型进一步模拟了伴随相干应变的锂化过程。模拟结果表明，VO和LiVO相之间特定的粗糙锂化界面源于锂化不均匀性。
