Lithium aluminum-layered double hydroxide chlorides (LDH): Formation enthalpies and energetics for lithium ion capture

Lili Wu, Ling Li, Samuel F. Evans, Tessa A. Eskander, Bruce A. Moyer, Zhichao Hu, Paul J. Antonick, Stephen Harrison, M. Parans Paranthaman, Richard Riman, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Layered aluminum double hydroxide chloride sorbents, LiCl∙Al 2 (OH) 6 .nH 2 O, Li-LDH, have shown promising application in selective Li extraction from geothermal brines. Maintaining LiCl uptake capacity and retaining a long cycle life are critical to widespread application of sorbent materials. To elucidate the energetics of Li capture, enthalpies of LDH with different Li content have been measured by acid solution calorimetry. The formation enthalpies generally become less exothermic as the Li content increases, which indicates that Li intercalation destabilizes the structure, and the enthalpies seem to approach a limit after the Li content x = 2Li/Al exceeds 1. To improve stability, metal doping of the aluminum LDH structure with iron was performed. Introduction of a metal with greater electron density but a similar ionic radius was postulated to improve the stability of the LDH crystal structure. The calorimetric results from Fe-doped LDH samples corroborate this as they are more exothermic than LDH-lacking Fe. This suggests that Fe doping is an effective way to stabilize the LDH phase.

Original languageEnglish (US)
Pages (from-to)2398-2404
Number of pages7
JournalJournal of the American Ceramic Society
Volume102
Issue number5
DOIs
StatePublished - May 2019
Externally publishedYes

Keywords

  • heat capacity
  • high-temperature calorimetry
  • lithium aluminum hydroxide chloride
  • lithium extraction
  • sorbents

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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