<br>降低掺铝 LiMn2O4 纳米粒子的晶格常数以增强电化学锂提取,Advanced Materials

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降低掺铝 LiMn2O4 纳米粒子的晶格常数以增强电化学锂提取
Advanced Materials ( IF 27.4 ) Pub Date : 2024-01-09 , DOI: 10.1002/adma.202310657
Guangcai Tan ₁ , Shun Wan ₁ , Jie-Jie Chen ₁ , Han-Qing Yu ₁ , Yan Yu ₂

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从盐水来源中选择性、高效地提取锂对于解决能源和环境挑战至关重要。采用LiMn ₂ O ₄ (LMO)电极的电化学系统已被认为是锂回收的有效方法。然而，LMO的锂选择性和稳定性需要进一步提高其实际应用。在此，通过一种简便的一步固态烧结方法成功制备了晶格常数降低的Al掺杂LMO，从而提高了锂选择性。通过光谱分析和理论计算证明了Al掺杂LMO中晶格常数的降低。与原始LMO相比，Al掺杂LMO（LiAl _0.05 Mn _1.95 O ₄ ，LMO-Al0.05）表现出更高的电容、更低的电阻和更高的稳定性。此外，循环伏安法和多尺度模拟表明，晶格常数降低的LMO-Al0.05可以提供更高的Li ⁺扩散系数和更低的嵌入能。当用于混合电容去离子（CDI）时，LMO-Al0.05获得了21.7 mg g ^-1的Li ⁺嵌入容量和2.6 Wh mol ^-1 Li ⁺的低能耗。重要的是，LMO-Al0.05 在合成盐水中实现了高 Li ⁺萃取率（约 86%），Li ⁺ /Na ⁺和 Li ⁺ /Mg ²⁺选择性分别为 1653.8 和 434.9。结果表明，晶格常数降低的掺铝 LMO 可能是电化学锂提取的可持续解决方案。

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Reduced Lattice Constant in Al-Doped LiMn2O4 Nanoparticles for Boosted Electrochemical Lithium Extraction

Extracting lithium selectively and efficiently from brine sources is crucial for addressing energy and environmental challenges. The electrochemical system employing LiMn₂O₄ (LMO) electrodes has been recognized as an effective method for lithium recovery. However, the lithium selectivity and stability of LMO need further enhancement for its practical applications. Herein, the Al-doped LMO with reduced lattice constant is successfully fabricated through a facile one-step solid-state sintering method, leading to enhanced lithium selectivity. The reduced lattice constant in Al-doped LMO is proved through spectroscopic analyses and theoretic calculations. Compared to the original LMO, the Al-doped LMO (LiAl_0.05Mn_1.95O₄, LMO-Al0.05) exhibits highercapacitance, lower resistance, and improved stability. Moreover, the LMO-Al0.05 with reduced lattice constant can offer higher Li⁺ diffusion coefficient and lower intercalation energy revealed by cyclic voltammetry and multiscale simulations. When employed in hybrid capacitive deionization (CDI), the LMO-Al0.05 obtains a Li⁺ intercalation capacity of 21.7 mg g⁻¹ and low energy consumption of 2.6 Wh mol⁻¹ Li⁺. Importantly, the LMO-Al0.05 achieves a high Li⁺ extraction percentage (≈86%) with Li⁺/Na⁺ and Li⁺/Mg²⁺ selectivity of 1653.8 and 434.9, respectively, in synthetic brine. The results demonstrate that the Al-doped LMO with reduced lattice constant could be a sustainable solution for electrochemical lithium extraction.

更新日期：2024-01-09

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