It is accepted that cerium doping is a great way to stabilize the structure of metallic oxides and improve the electrochemical performance of lithium (Li)-ion batteries (LIBs). Using a simple hydrothermal method, we doped Ce into tin-based oxides and synthesized Ce-doped SnO2@Ti3C2 nanocomposites with Ti3C2-MXene as a framework. The as-prepared Ce-doped SnO2@Ti3C2 nanocomposites show higher surface area and lower Li+ diffusion barrier, and the galvanostatic charge/discharge cycle stability is better than that of SnO2@Ti3C2. Additionally, the nanocomposites exhibit excellent initial discharge capacity (1482.6 mAh g[Formula: see text]) at 100 mA g[Formula: see text] and a remarkable cycle rate performance. After 150 cycles, the achieved discharge capacity remained at 310.8 mAh g[Formula: see text]. This study provides a new method of using two-dimensional (2D) layered materials and rare earth elements as lithium-ion storage materials.

中文翻译：

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用于增强锂离子存储的 Ce 掺杂 SnO2@Ti3C2 纳米复合材料的合成

人们普遍认为，铈掺杂是稳定金属氧化物结构和提高锂离子电池 (LIB) 电化学性能的好方法。使用简单的水热法，我们将 Ce 掺杂到锡基氧化物中并合成了 Ce 掺杂的 SnO2@Ti3C2Ti纳米复合材料3C2-MXene 作为一个框架。所制备的 Ce 掺杂 SnO2@Ti3C2纳米复合材料具有更高的表面积和更低的 Li+ 扩散势垒，且恒电流充放电循环稳定性优于 SnO2@Ti3C2. 此外，纳米复合材料在 100 mA g[公式：参见文本]时表现出优异的初始放电容量（1482.6 mAh g[公式：参见文本]）和显着的循环速率性能。150次循环后，达到的放电容量保持在310.8 mAh g[公式：见正文]。该研究提供了一种使用二维（2D）层状材料和稀土元素作为锂离子存储材料的新方法。