Issue 23, 2025

An ion-exchange strategy to eliminate anion impurities within LDH structure for refined NCA cathode materials

Abstract

The Ni-rich NCA precursor (Ni0.80Co0.15Al0.05(OH)2), synthesized via co-precipitation using sulfate salt, contains anions such as SO42− within the layered double hydroxide (LDH) structure to compensate for the high oxidation state of Al3+. In particular, the inserted anions can deteriorate the performance of cathode materials by generating Li2SO4 during calcination, which induces particle agglomeration and disrupts the formation of a crystal structure. In this study, we explored an ion-exchange strategy using chloride ions to remove sulfate ions, since chloride ions easily volatilize during calcination. As a result, the synthesized NCA cathode represents superior rate capability and capacity retention by decreasing resistance, retaining a well-ordered crystal structure, and suppressing side reactions. These results underscore the importance of anion control in Ni-rich cathode materials with the LDH structure.

Graphical abstract: An ion-exchange strategy to eliminate anion impurities within LDH structure for refined NCA cathode materials

Supplementary files

Article information

Article type
Paper
Submitted
13 Feb 2025
Accepted
19 Apr 2025
First published
12 May 2025

J. Mater. Chem. A, 2025,13, 17553-17561

An ion-exchange strategy to eliminate anion impurities within LDH structure for refined NCA cathode materials

D. Kang, J. Im, M. Kim, T. Kim, B. Kang, M. Jeon, J. Park, S. Chae and M. Ko, J. Mater. Chem. A, 2025, 13, 17553 DOI: 10.1039/D5TA01167A

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