Citation: HUANG Wei, WU Chun-Yang, ZENG Yue-Wu, JIN Chuan-Hong, ZHANG Ze. Surface Analysis of the Lithium-Rich Cathode Material Li_1.2Mn_0.54Co_0.13Ni_0.13Na_xO₂ by Advanced Electron Microscopy[J]. Acta Physico-Chimica Sinica, ;2016, 32(9): 2287-2292. doi: 10.3866/PKU.WHXB201605164 shu

Surface Analysis of the Lithium-Rich Cathode Material Li_1.2Mn_0.54Co_0.13Ni_0.13Na_xO₂ by Advanced Electron Microscopy

State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China

Received Date: 5 April 2016
Revised Date: 16 May 2016

Fund Project: The project was supported by the National Natural Science Foundation of China (51222202).

In this work, Li_1.2Mn_0.54Co_0.13Ni_0.13Na_xO₂ was prepared via an ion-exchange process combined with a solid- state reaction. Aberration- corrected scanning transmission electron microscopy (STEM), energydispersive X-ray spectroscopy (EDS), and electron energy loss spectroscopy (EELS) were all used to study the surface structure and chemical distribution of the resulting material. Nickel (Ni) was found to be enriched at the surface in regions perpendicular to the lithium diffusion channels (that is, the (200) surfaces) and also exhibited a tendency to diffuse into the lithium (Li) layers, generating a Fm3m rocksalt phase. In contrast, cobalt (Co) segregated along the transition metal (TM) layers of the (001) and (200) surfaces. The results of aging trials demonstrated that Co-enriched layers lead to surface structure instability, as evidenced by the formation of a large number of antisite defects (Li-TM) and rocksalt phase structures at the (001) surface during aging.
- Lithium ion battery,
- Cathode material,
- Lithium rich cathode material,
- Surface segregation,
- Scanning transmission electron microscopy
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沈阳化工大学材料科学与工程学院沈阳 110142

Surface Analysis of the Lithium-Rich Cathode Material Li1.2Mn0.54Co0.13Ni0.13NaxO2 by Advanced Electron Microscopy

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通讯作者: 陈斌, bchen63@163.com

Surface Analysis of the Lithium-Rich Cathode Material Li_1.2Mn_0.54Co_0.13Ni_0.13Na_xO₂ by Advanced Electron Microscopy