Ti2Nb10O29/C nanoparticles with a carbon content of 13 wt% and a mean size of 50 nm were fabricated through a convenient and effective in situ sol–gel process. The small grain size and carbon modification can improve the pseudocapacitive effect of the Ti2Nb10O29/C nanoparticles, leading to excellent rate capacity, especially at high current rate. Specifically, the discharge capacity of the Ti2Nb10O29/C electrode is 258.3, 236.0, 216.6, 184.5 and 161.5 mAh·g−1 at different current densities of 1C, 5C, 10C, 20C and 30C. Nevertheless, the discharge capacity of the Ti2Nb10O29 electrode is 244.9 mAh·g−1 at 1C, which is rapidly reduced to 89.7 mAh·g−1 at 30C. In addition, the small size and carbon layer of the Ti2Nb10O29/C nanoparticles can supply abundant active sites for Li+ storage as well as enhance the electronic conductivity and Li+ diffusion, endowing these nanoparticles with a high discharge capacity and excellent cycle performance.

中文翻译：

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Ti2Nb10O29/C纳米颗粒的原位溶胶-凝胶合成，增强了对高倍率锂离子电池的赝电容贡献

Ti2Nb10O29/C 纳米颗粒的碳含量为 13 wt%，平均尺寸为 50 nm，通过方便有效的原位溶胶-凝胶工艺制备。小晶粒尺寸和碳改性可以提高 Ti2Nb10O29/C 纳米粒子的赝电容效应，从而获得优异的倍率容量，尤其是在高电流倍率下。具体而言，Ti2Nb10O29/C电极在1C、5C、10C、20C和30C不同电流密度下的放电容量分别为258.3、236.0、216.6、184.5和161.5 mAh·g-1。尽管如此，Ti2Nb10O29 电极的放电容量在 1C 时为 244.9 mAh·g-1，在 30C 时迅速降低到 89.7 mAh·g-1。此外，Ti2Nb10O29/C 纳米粒子的小尺寸和碳层可以为 Li+ 存储提供丰富的活性位点，并增强电子导电性和 Li+ 扩散，