Abstract Functionalized and/or heteroatom-doped nanostructured hollow graphitic carbonaceous composites have stimulated extensive interest in many applications due to their distinctive structures and physical properties. However, there are still some amorphous carbons in the graphitic composite matrix, which limit their broader usage. Herein, we report a simple acid-based hydrothermal process to not only selectively decompose the residual amorphous carbon but also functionalize the resulting graphitic hybrid carbon, thereby forming the functionalized N-doped hollow graphitic carbon-nanotube/carbon-nanosphere hybrids. As a lithium-ion battery (LIB) anode, this material has an exceptional reversible capacity of ∼990 mAh g−1 at 0.1 A g−1 and remains at ∼850 mAh g−1 after 240 cycles, hence displaying great potential as high-performance carbon-based anodes for LIBs.

中文翻译：

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功能化氮掺杂中空石墨碳纳米管/碳纳米球复合材料

摘要功能化和/或杂原子掺杂的纳米结构中空石墨碳质复合材料由于其独特的结构和物理性质，在许多应用中引起了广泛的兴趣。然而，石墨复合基体中仍然存在一些无定形碳，这限制了其更广泛的应用。在此，我们报告了一种简单的酸基水热工艺，不仅可以选择性地分解残留的无定形碳，还可以将所得的石墨杂化碳功能化，从而形成功能化的 N 掺杂空心石墨碳纳米管/碳纳米球杂化物。作为锂离子电池 (LIB) 负极，该材料在 0.1 A g-1 时具有 ~990 mAh g-1 的出色可逆容量，并且在 240 次循环后仍保持在 ~850 mAh g-1，