In-Depth TEM Investigation on Structural Inhomogeneity within a Primary LixNi0.835Co0.15Al0.015O2 Particle: Origin of Capacity Decay during High-Rate Discharge

Hyesu Lee; Eunmi Jo; Kyung Yoon Chung; Dongjin Byun; Seung Min Kim; Wonyoung Chang

doi:10.1002/anie.201910670

In-Depth TEM Investigation on Structural Inhomogeneity within a Primary Li_xNi_0.835Co_0.15Al_0.015O₂ Particle: Origin of Capacity Decay during High-Rate Discharge

Hyesu Lee
, Eunmi Jo
, Kyung Yoon Chung
, Dongjin Byun
, Seung Min Kim^*
, Wonyoung Chang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

The structural stability of cathode materials during electrochemical reactions, in particular, under high-rate discharge, is pertinent to the design and development of new electrode materials. This study investigates the structural inhomogeneity that develops within a single LiNi_0.835Co_0.15Al_0.015O₂ (NCA83) particle during a fast discharging process under different cutoff voltages. Some of the NCA83 particles discharged from a high cutoff voltage (4.8 V) developed surface areas in which the layered structure was recovered, although the interiors retained the degraded spinel structure. These micro- and nano-scale structural inversions from high cutoff voltage seem highly correlated with structural evolutions in the initial charged state, and may ultimately degrade the cycling stability. This study advances understanding of the structural inhomogeneity within primary particles during various electrochemical processes and may facilitate the development of new Ni-rich cathode materials.

Original language	English
Pages (from-to)	2385-2391
Number of pages	7
Journal	Angewandte Chemie - International Edition
Volume	59
Issue number	6
DOIs	https://doi.org/10.1002/anie.201910670
Publication status	Published - 2020 Feb 3

Bibliographical note

Funding Information:
This work was supported by the Korea Institute of Science and Technology (KIST) Institutional Program (Project 2E29642). This work was also supported by the National Research Foundation of Korea (NRF) grant (No. 2018R1A2B2005205).

Publisher Copyright:
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

Ni-rich cathode materials
TEM depth profiling
high-rate discharge
lithium-ion batteries
structural inhomogeneity

ASJC Scopus subject areas

Catalysis
General Chemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1002/anie.201910670

Cite this

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title = "In-Depth TEM Investigation on Structural Inhomogeneity within a Primary LixNi0.835Co0.15Al0.015O2 Particle: Origin of Capacity Decay during High-Rate Discharge",

abstract = "The structural stability of cathode materials during electrochemical reactions, in particular, under high-rate discharge, is pertinent to the design and development of new electrode materials. This study investigates the structural inhomogeneity that develops within a single LiNi0.835Co0.15Al0.015O2 (NCA83) particle during a fast discharging process under different cutoff voltages. Some of the NCA83 particles discharged from a high cutoff voltage (4.8 V) developed surface areas in which the layered structure was recovered, although the interiors retained the degraded spinel structure. These micro- and nano-scale structural inversions from high cutoff voltage seem highly correlated with structural evolutions in the initial charged state, and may ultimately degrade the cycling stability. This study advances understanding of the structural inhomogeneity within primary particles during various electrochemical processes and may facilitate the development of new Ni-rich cathode materials.",

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author = "Hyesu Lee and Eunmi Jo and Chung, \{Kyung Yoon\} and Dongjin Byun and Kim, \{Seung Min\} and Wonyoung Chang",

note = "Funding Information: This work was supported by the Korea Institute of Science and Technology (KIST) Institutional Program (Project 2E29642). This work was also supported by the National Research Foundation of Korea (NRF) grant (No. 2018R1A2B2005205). Publisher Copyright: {\textcopyright} 2019 Wiley-VCH Verlag GmbH \& Co. KGaA, Weinheim",

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AU - Kim, Seung Min

AU - Chang, Wonyoung

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