Three-Dimensional (3D) Nanostructured Skeleton Substrate Composed of Hollow Carbon Fiber/Carbon Nanosheet/ZnO for Stable Lithium Anode.
Three-Dimensional (3D) Nanostructured Skeleton Substrate Composed of Hollow Carbon Fiber/Carbon Nanosheet/ZnO for Stable Lithium Anode.
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DOI：
10.1021/acsami.0c21747
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发表时间：
2021-01
影响因子：
9.5
通讯作者：
Xue-Liang Zhang;Zhiqin Ruan;Qiao-Tong He;Xu-Jia Hong;Xin Song;Qi-Feng Zheng;J. Nie;Yuepeng Cai;Hongxia Wang
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文献类型：
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作者：
Xue-Liang Zhang;Zhiqin Ruan;Qiao-Tong He;Xu-Jia Hong;Xin Song;Qi-Feng Zheng;J. Nie;Yuepeng Cai;Hongxia Wang
长期以来，锂金属电池的实际应用一直受到库仑效率低和在锂金属电极上形成树枝晶的阻碍。在本论文中，我们以2-甲基咪唑(2-MIZ)包覆的3D布为支架，合成了一种新型的三维(3D)纳米骨架基板，该骨架由掺氮中空碳纤维/碳纳米片/氧化锌(NHCF/CN/ZnO)组成。探讨了这种新型层次化结构的形成机理。衬底的多层分层结构和丰富的亲锂成核位为锂金属的沉积和剥离提供了稳定的环境，从而防止了锂树枝晶的产生。因此，基于NHCF/CN/ZnO集电体的锂负极在0.5 mA cm-2下循环400次后，库仑效率达到96.47%。制备的NHCF/CN/ZnO/Li电极在5 mA cm~(-2)和5 mAhcm~(-2)的对称电池中表现出超过800h的循环性能和小于30 mV的超低电压滞后。即使在10.4 mg cm~(-2)的高负载量下，LiFePO_4的NHCF/CN/ZnO/Li负极也能很好地工作。我们的工作为高性能锂金属电池三维分层结构的表面制备提供了一条途径。
The practical applications of Li metal batteries (LMBs) have long been limited by the obstacles of low Coulombic efficiency (CE) and formation of dendrites on Li metal electrode. Herein, we demonstrated the synthesis of a novel three-dimensional (3D) nanostructured skeleton substrate composed of nitrogen-doped hollow carbon fiber/carbon nanosheets/ZnO (NHCF/CN/ZnO) using 2-methylimidazole (2-MIZ)-coated 3D cloth as a scaffold. The mechanism of formation of this novel hierarchical structure was investigated. The multilayered hierarchical structure and abundant lithiophilic nucleation sites of the substrate provide a stable environment for the deposition and stripping of lithium metal, thus preventing the generation of lithium dendrites. Consequently, the lithium anode based on the NHCF/CN/ZnO current collector demonstrated an excellent Coulombic efficiency of 96.47% after 400 cycles at 0.5 mA cm-2. The prepared NHCF/CN/ZnO/Li electrode also showed outstanding cycling performance of over 800 h and an ultralow voltage hysteresis of less than 30 mV in a symmetric cell at 5 mA cm-2 and 5 mAh cm-2. Even at a high loading of the cathode with 10.4 mg cm-2, the full cell of NHCF/CN/ZnO/Li anode with LiFePO4 can also work very well. Our work offers a path toward the facial preparation of 3D hierarchical structure for high-performance lithium metal batteries.