Conductive LaCeNb6O18 with a Very Open A-Site-Cation-Deficient Perovskite Structure: A Fast- and Stable-Charging Li+-Storage Anode Compound in a Wide Temperature Range,Advanced Energy Materials

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Conductive LaCeNb6O18 with a Very Open A-Site-Cation-Deficient Perovskite Structure: A Fast- and Stable-Charging Li+-Storage Anode Compound in a Wide Temperature Range
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-06-16 , DOI: 10.1002/aenm.202200656
Wenze Wang ₁ , Qian Zhang ₁ , Tian Jiang ₁ , Songjie Li ₁ , Jiazhe Gao ₁ , Xuehua Liu ₁ , Chunfu Lin ₁

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Li₄Ti₅O₁₂ (LTO) is the most famous Li⁺-storage anode material with fast- and stable-charging capability, but suffers from several disadvantages, such as poor electron conduction, low energy density, and disappointing high-temperature performance. Here, LaCeNb₆O₁₈ (LCNO) micrometer-sized particles are explored as a fast- and stable-charging anode material superior to LTO sub-micrometer-sized particles in terms of the working potential, rate capability, and high-temperature performance. The conductive Ce³⁺ and Nb⁵⁺↔Nb³⁺ reactions in LCNO, respectively, enable its significantly larger electronic conductivity and lower working potential than those of LTO. LCNO owns a very open A-site-cation-deficient perovskite structure, in which (vacancy/La/Ce)O₁₂ layers with electrochemical inactivity and superior volume-buffering capability locate between active NbO₆ layers, leading to not only fast Li⁺ diffusivity but also low- and negative-strain behavior at different temperatures. At 25 °C, LCNO exhibits higher rate capability (50 vs 0.1 C capacity ratio of 67.9%) than that of LTO, and excellent cyclability. At 60 °C, LCNO maintains excellent cyclability, and achieves larger reversible capacity and even higher rate capability, whereas the high temperature lowers all the electrochemical properties of LTO. Therefore, LCNO holds great promise for fast- and stable-charging applications in a wide temperature range, even when its particle sizes are on the order of micrometers.

中文翻译：

具有非常开放的 A 位阳离子缺陷钙钛矿结构的导电 LaCeNb6O18：一种在宽温度范围内快速稳定充电的锂离子存储负极化合物

Li ₄ Ti ₅ O ₁₂ (LTO)是最著名的具有快速稳定充电能力的Li ⁺存储负极材料，但存在电子传导性差、能量密度低和高温性能不佳等缺点. 在这里，研究人员探索了 LaCeNb ₆ O ₁₈ (LCNO) 微米级颗粒作为一种在工作电位、倍率性能和高温性能方面优于 LTO 亚微米级颗粒的快速稳定充电负极材料。导电的 Ce ³⁺和 Nb ⁵⁺↔ Nb ³⁺与 LTO 相比，LCNO 中的反应分别使其具有显着更大的电子电导率和更低的工作电位。LCNO 具有非常开放的 A 位阳离子缺陷型钙钛矿结构，其中具有电化学惰性和优异体积缓冲能力的 (空位/La/Ce)O ₁₂层位于活性 NbO ₆层之间，导致不仅快速的 Li ⁺扩散率以及不同温度下的低应变和负应变行为。在 25 ° C 时，LCNO 表现出比 LTO 更高的倍率性能（50 vs 0.1 C 容量比为 67.9%），并具有优异的可循环性。在 60 °C、LCNO保持了优异的循环性，实现了更大的可逆容量和更高的倍率性能，而高温降低了LTO的所有电化学性能。因此，LCNO 在很宽的温度范围内具有快速和稳定充电应用的巨大潜力，即使它的颗粒尺寸在微米量级。

更新日期：2022-06-16

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