Lithiophilic current collector based on nitrogen doped carbon nanotubes and three-dimensional graphene for long-life lithium metal batteries
Lithiophilic current collector based on nitrogen doped carbon nanotubes and three-dimensional graphene for long-life lithium metal batteries
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DOI：
10.1016/j.mseb.2021.115067
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发表时间：
2021-02-11
影响因子：
3.6
通讯作者：
Shanov, Vesselin
中科院分区：
文献类型：
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作者：
Fang, Yanbo;Hsieh, Yu-Yun;Shanov, Vesselin
金属锂作为一种极具吸引力的负极材料，在先进的储能器件中得到了广泛的应用。然而，诸如锂枝晶的生长、在循环过程中显著的体积变化、引起的安全隐患和有限的寿命等缺点阻碍了锂金属阳极的商业应用。在这里，我们提出了一种新的复合材料结构，由多孔三维石墨烯（3DG）与氮掺杂的碳纳米管（NCNT）装饰。所产生的NCNT-3DG碳支架在循环期间对显著的体积变化具有弹性，而NCNT用作用于均匀锂成核的亲锂位点，这使得能够均匀锂沉积。这种新型的杂化材料使锂阳极在10 mA cm（-2）的高电流密度下具有长达1200次循环的长期稳定性。这显著提高了所产生的锂硫全电池的性能。NCNT-3DG结构的表现为金属锂阳极的设计和制造提供了新的见解。
Lithium metal as an attractive anode material has been widely used in advanced energy storage devices. However, drawbacks such as growth of lithium dendrites, significant volume changes during the cycling process, causing safety hazards and limited span-life, have impeded the commercial application of lithium metal anode. Here, we present a new composite structure, consisting of porous three-dimensional graphene (3DG) decorated with nitrogen-doped carbon nanotubes (NCNT). The created NCNT-3DG carbon scaffold is resilient towards significant volumetric change during cycling, while the NCNTs serve as lithiophilic sites for uniform lithium nucleation which enables uniform lithium deposition. This novel hybrid endows the lithium anode with a long-term stability reaching up to 1200 cycles at high current density of 10 mA cm(-2). This significantly improved the performance of the created lithium-sulfur full cells. The demonstrated performance of the NCNT-3DG structure provides new insights for the designing and fabrication of metallic lithium anodes.