Please use this identifier to cite or link to this item: https://doi.org/10.1039/c6ra17681j
Title: Grain boundary effects on Li-ion diffusion in a Li1.2Co0.13Ni0.13Mn0.54O2 thin film cathode studied by scanning probe microscopy techniques
Authors: Yang, S
Yan, B 
Lu, L 
Zeng, K 
Keywords: Bias voltage
Cathodes
Characterization
Cobalt
Diffusion
Electrodes
Grain boundaries
Hydrophobicity
Ions
Lithium
Manganese
Nickel
Scanning probe microscopy
Thin films
Cath-ode materials
Charge/discharge
Grain boundary effects
In-situ characterization
Ion intercalation
Layered Structures
Scanning probe microscopy techniques
Thin film cathodes
Lithium-ion batteries
Issue Date: 2016
Citation: Yang, S, Yan, B, Lu, L, Zeng, K (2016). Grain boundary effects on Li-ion diffusion in a Li1.2Co0.13Ni0.13Mn0.54O2 thin film cathode studied by scanning probe microscopy techniques. RSC Advances 6 (96) : 94000-94009. ScholarBank@NUS Repository. https://doi.org/10.1039/c6ra17681j
Abstract: This paper presents the results of in situ characterization of grain boundary effects on Li-ion diffusion in Li1.2Co0.13Ni0.13Mn0.54O2 thin film cathode by using various Scanning Probe Microscopy (SPM) techniques. In particular, conductive-AFM results show that grain boundaries are more conductive than those in the grain interior. With the increase of bias voltage, the high conductive regimes extend from grain boundaries to interiors. I-V curves show decreased current and increased voltage for current initiation when the tip is moved farther away from boundaries. Furthermore, positive and negative bias applied at grain boundary by biased-AFM can distinguish and manipulate the local Li-ion intercalation/de-intercalation processes at grain level in the cathode material without assembly of a full battery cell. Exfoliation and delamination, degradation and structural changes are observed when the Li-ions are move-out or move-into the layered structure of the cathode at the grain level. These results can provide important insights into understanding the Li-ion diffusion and aging mechanisms of cathode materials during charge/discharge processes. This journal is © The Royal Society of Chemistry 2016.
Source Title: RSC Advances
URI: https://scholarbank.nus.edu.sg/handle/10635/174038
ISSN: 20462069
DOI: 10.1039/c6ra17681j
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