Unraveling atomic-scale lithiation mechanisms in a NiO thin film electrode

Qu, Ke1,2; Ding, Zhengping2; Wu, Mei2,3; Liu, Pengfei4; Chen, Shulin2; Zhu, Ruixue2,3; Han, Bo2; Ma, Xiumei2; Gao, Peng2,3; Li, Jiangyu1,5

2020-12-21

10.1039/d0ta08415h

Journal of Materials Chemistry A   影响因子和分区

2050-7488

2050-7496

An in-depth mechanistic understanding of the electrochemical lithiation process of nickel oxide (NiO) is both fundamentally interesting and technologically relevant for its potential applications. In this study, we utilize in situ transmission electron microscopy to unravel the intricate morphological features, charge state changes and lattice orientation relationships, leading to a comprehensive understanding on the conversion process in an epitaxially grown NiO thin film. Dynamic structural and chemical imaging, in combination with first-principles calculations, reveals the first direct visualization of the intermediate phase LixNiO, in which the interstitial sites are identified to be half occupied alternately, at the intercalation stage. A topotactic phase transition is identified, indexed as NiO (001)//Ni (111) by in situ electron diffraction. The kinetics of Li-ion transport can be affected by epitaxial strain and lattice defects inside the thin-film electrodes, in which disarranged structures at the boundary can promote ion diffusion, while compressive interfacial strain can have an opposite effect. These atomic-scale insights are of general importance in understanding conversion-type electrodes and guiding the design principle for viable conversion type electrode materials.

SCI ; EI

英语

通讯

National Natural Science Foundation of China[51672007][11974023] ; Key-Area Research and Development Program of GuangDong Province[2018B010109009] ; China Postdoctoral Science Foundation[2019M663177][2019M650333] ; National Key R&D Program of China[2016YFA0300903]

Chemistry ; Energy & Fuels ; Materials Science

Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary

WOS:000599249300029

ROYAL SOC CHEMISTRY

20205209679086

Thin films ; Electrodes ; High resolution transmission electron microscopy ; Calculations

Optical Devices and Systems:741.3 ; Inorganic Compounds:804.2 ; Mathematics:921

Web of Science

1.Chinese Acad Sci, Shenzhen Inst Adv Technol, Shenzhen Key Lab Nanobiomech, Shenzhen 518055, Guangdong, Peoples R China
2.Peking Univ, Sch Phys, Electron Microscopy Lab, Beijing 100871, Peoples R China
3.Peking Univ, Int Ctr Quantum Mat, Sch Phys, Beijing 100871, Peoples R China
4.Xiamen Univ, Coll Mat, Collaborat Innovat Ctr Chem Energy Mat, State Key Lab Phys Chem Solid Surface,Fujian Key, Xiamen 361005, Peoples R China
5.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China

Qu, Ke,Ding, Zhengping,Wu, Mei,et al. Unraveling atomic-scale lithiation mechanisms in a NiO thin film electrode[J]. Journal of Materials Chemistry A,2020,8(47):25198-25207.

Qu, Ke.,Ding, Zhengping.,Wu, Mei.,Liu, Pengfei.,Chen, Shulin.,...&Li, Jiangyu.(2020).Unraveling atomic-scale lithiation mechanisms in a NiO thin film electrode.Journal of Materials Chemistry A,8(47),25198-25207.

Qu, Ke,et al."Unraveling atomic-scale lithiation mechanisms in a NiO thin film electrode".Journal of Materials Chemistry A 8.47(2020):25198-25207.