Single Lithium-Ion Conductor Decorated LiMn<sub>2</sub>O<sub>4</sub> with High Selectivity and Stability for Electrochemical Lithium Extraction.
basic_science · Level V
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- Record sourced from PubMed, PMID 39593199.
- Also identified by DOI 10.1021/acsnano.4c15473.
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Abstract
Spinel LiMn<sub>2</sub>O<sub>4</sub> (LMO) is commonly used for electrochemically extracting lithium ions from brine. However, its cycle stability is significantly reduced due to Mn<sup>2+</sup> dissolution. Here, we report high-performance LMO particles decorated by Li<sub>1.5</sub>Al<sub>0.5</sub>Ge<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> (LAGP) as an electrode for electrochemical lithium extraction. Compared with bare sample, the modified electrode presents higher Li-ion selectivity because LAGP is a single Li-ion conductor, and as a result of avoiding the cointercalation of other ions in brine, the sample exhibits a higher Li-ion extraction capacity of 2.44 mmol·g<sup>-1</sup>. The cycling stability is also improved in LMO with LAGP coating by alleviating the loss of manganese, indicating a reduced Mn loss of 0.20% after 100 cycles compared to the LAGP free counterpart of 0.47%. Our work demonstrates an effective method for lithium purification from brine, and the detailed mechanism is also studied systematically.