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

Research output: Contribution to journalArticle

1 Citation (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 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.

Original languageEnglish
Pages (from-to)2385-2391
Number of pages7
JournalAngewandte Chemie - International Edition
Volume59
Issue number6
DOIs
Publication statusPublished - 2020 Feb 3

Keywords

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

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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