Abstract
Spinel lithium titanate (Li4Ti5O12, LTO), with the merits of safety operation voltage, stable crystal structure, and minor lattice volume changes, becomes an optimal anode material for high-power Li-ion batteries. However, the inherent wide bandgap and low lithiation reactivity of Li4Ti5O12 bring about poor conductivity and lithiation dynamics, limiting its further applications. Herein, we design and prepare unique Li4Ti5O12 anode materials with extremely low dopant content of Na+ utilizing the amorphous precursors. The resultant Li4Na0.008Ti5O12.004 sample (denoted as NLTO-0.008) presents superior rate performances and cycle ability, with a reversible capacity of 149.4 mAh·g−1 at the current rate of 10.0C. NLTO-0.008 retains the charge capacity of 151.3 mAh·g−1 with a capacity loss of 0.5% after 1000 cycles at the current rate of 1.0C (charge) /10.0C (discharge). The kinetic studies furtherly demonstrate that the lithiation reaction energy and diffusion energy barrier decrease by 28.8% and 30%, respectively. Crystal structure analysis indicates that Na+ occupies the 16d Li site and forms distorted LiO4 tetrahedron and TiO6 octahedron. This lattice distortion forms open diffusion channels, thus enhancing the Li+ diffusion dynamics and decreasing the lithiation reaction energy barrier for Li4Ti5O12. Therefore, the pre-sodiation strategy may arouse great interest in understanding and developing intercalation-type transition-metal-based electrode materials in high-power lithium-ion batteries.
Graphical abstract
摘要
尖晶石钛酸锂(Li4Ti5O12)具有工作电压安全、晶体结构稳定、晶格体积变化小等优点,是高功率锂离子电池理想的负极材料之一。然而,由于本征带隙宽和锂化反应性低,Li4Ti5O12的导电性低和电化学极化严重,限制了其进一步的应用。为此,本文基于非晶钛氧化物前驱体,利用预钠化策略设计并制备了钠掺杂量极其低的Li4Ti5O12负极材料,并表现出优异的倍率性能和循环性能。Li4Na0.008Ti5O12.004样品(标记为NLTO-0.008)在10C倍率下充放电,可逆容量达149.4 mAh·g-1。NLTO-0.008甚至在1C(充电)/10C(放电)电流密度下,1000次循环后仍保持151.3 mAh·g-1的放电比容量,容量仅损失0.5%。动力学研究表明,NLTO-0.008的锂化反应能垒和扩散能垒分别降低了28.8%和30%。晶体结构分析表明,Na+选择性占据Li4Ti5O12的16d Li位,诱导LiO4四面体和TiO6八面体晶格畸变。扭曲的晶格结构,提供了开放的Li+扩散通道,进而降低Li4Ti5O12的反应/扩散能垒的。因此,本文采用的预钠化策略对于理解和开发高功率锂离子电池嵌入型过渡金属基电极材料具有重要意义。
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This work was financially supported by the National Natural Science Foundation of China (No. 52002116) and the Key Science and Technology Program of Henan Province (No. 192102210004).
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Zhang, YH., Nie, ZH., Du, CQ. et al. Ultrahigh lithiation dynamics of Li4Ti5O12 as an anode material with open diffusion channels induced by chemical presodiation. Rare Met. 42, 471–483 (2023). https://doi.org/10.1007/s12598-022-02135-6
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DOI: https://doi.org/10.1007/s12598-022-02135-6