Transition metal selenides (TMSes) are regarded as ideal anode materials for lithium-ion batteries (LIBs) due to their high theoretical capacity, but some defects, such as volume expansion and poor conductivity, still need to be overcome. The design of hierarchical structural materials with compositional and structural complexity is extremely attractive in the field of energy conversion. Herein, a core–shell hierarchical polyhedral Co₃Se₄ with N-doped and carbon nanotubes intertwined (N-Co₃Se₄@C-CNTs) is synthesized using a facile metal–organic framework (MOFs) self-templating strategy and selenization treatment. The Co₃Se₄ nanoparticles can be confined in the multilocular and hollow carbon framework intertwined with CNTs. Benefiting from the unique structure and composition superiority, the synthesized N-Co₃Se₄@C-CNTs exhibit excellent Li storage performance. Specifically, they present a high reversible capacity of 820 mAh g⁻¹ at 0.1 A g⁻¹ after 100 cycles and outstanding cycling stability (558 mAh g⁻¹ at 2 A g⁻¹ after 1000 cycles). In addition, a LiCoO₂‖N-Co₃Se₄@C-CNT full cell is successfully constructed to show its potential for practical application. The reaction kinetics and Li storage mechanisms of the N-Co₃Se₄@C-CNT electrode are investigated to explain the impressive electrochemical performance. This work reveals the great application potential of the N-Co₃Se₄@C-CNT electrode in constructing advanced LIBs.

中文翻译：

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封装在掺氮碳框架中的分层 Co3Se4 纳米颗粒与作为锂离子电池阳极的碳纳米管交织在一起

过渡金属硒化物（TMSes）因其高理论容量而被认为是锂离子电池（LIBs）的理想负极材料，但仍需克服体积膨胀和导电性差等缺陷。具有成分和结构复杂性的分层结构材料的设计在能量转换领域极具吸引力。在此，使用简便的金属有机框架 (MOFs) 自模板策略和硒化合成了一种核壳分层多面体 Co ₃ Se ₄与 N 掺杂和碳纳米管交织在一起（N-Co ₃ Se ₄ @C-CNTs）治疗。Co ₃ Se ₄纳米粒子可以被限制在与碳纳米管交织在一起的多室和空心碳框架中。得益于独特的结构和组成优势，合成的 N-Co ₃ Se ₄ @C-CNTs 表现出优异的锂存储性能。具体而言，它们在 100 次循环后在 0.1 A g ^{-1 下}表现出 820 mAh g ^-1的高可逆容量和出色的循环稳定性（在 2 A g ^{-1 下}在 1000 次循环后具有558 mAh g ^-1）。此外，成功构建了 LiCoO ₂ ‖N-Co ₃ Se ₄ @C-CNT 全电池，展示了其实际应用的潜力。N-Co的反应动力学和锂储存机制_{研究了 3} Se ₄ @C-CNT 电极以解释令人印象深刻的电化学性能。这项工作揭示了 N-Co ₃ Se ₄ @C-CNT 电极在构建高级 LIB 方面的巨大应用潜力。