La(OH)<sub>3</sub>-Based Lithium Ionic Conductor for Quasi-Solid-State Lithium Metal Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 41318914.
- Also identified by DOI 10.1002/adma.202516709.
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Abstract
Quasi-solid-state lithium metal batteries (QSSLMBs) hold great promise for next-generation energy storage but face major challenges for applications, including air instability of electrolytes, high synthesis cost, and poor interfacial compatibility. Here, La(OH)<sub>3</sub>-based Li<sup>+</sup> conductor Li<sub>0.15</sub>Sr<sub>0.525</sub>La<sub>0.6</sub>(OH)<sub>3</sub> (LSLOH) is reported, which is air-stable and cost-effective. LSLOH serves as an ionic conductor exhibiting Li⁺ conductivity of 0.1 mS cm<sup>-1</sup> at 30 °C. To improve interfacial transport, LSLOH is incorporated into a polyethylene oxide (PEO)-LiTFSI polymer electrolyte (PL) to form a quasi-solid-state electrolyte (PL-LSLOH). LSLOH provides additional Li⁺ transport channels, while La<sup>3+</sup> and Sr<sup>2+</sup> interact with TFSI<sup>-</sup> to promote Li⁺ mobility. Moreover, LSLOH induces the formation of a LiOH and Li<sub>2</sub>O-rich solid electrolyte interphase, effectively suppressing Li dendrite growth. As a result, the LiNi<sub>0.6</sub>Co<sub>0.1</sub>Mn<sub>0.3</sub>O<sub>2</sub> | PL-LSLOH | Li pouch cells achieve 2.2 mAh cm<sup>-2</sup> at 0.83 mA cm<sup>-2</sup> (with cathode loading of 19 mg cm<sup>-2</sup>) over 200 cycles with 92.5% initial capacity retention, underscoring the potential for scale-up. For the first time, this work demonstrates La(OH)<sub>3</sub>-based lithium ionic conductors and electrolyte design that address key barriers to the QSSLMBs.