Mo Runwei, Tan Xinyi, Li Fan, Tao Ran, Xu Jinhui, Kong Dejia, Wang Zhiyong, Xu Bin, Wang Xiang, Wang Chongmin, Li Jinlai, Peng Yiting, Lu Yunfeng
Chemical and Biomolecular Engineering, University of California, Los Angeles, CA, 90095, USA.
State Key Laboratory of Supramolecular Structure and Materials, Jilin University, 130012, Changchun, China.
Nat Commun. 2020 Mar 13;11(1):1374. doi: 10.1038/s41467-020-14859-z.
Limited by the size of microelectronics, as well as the space of electrical vehicles, there are tremendous demands for lithium-ion batteries with high volumetric energy densities. Current lithium-ion batteries, however, adopt graphite-based anodes with low tap density and gravimetric capacity, resulting in poor volumetric performance metric. Here, by encapsulating nanoparticles of metallic tin in mechanically robust graphene tubes, we show tin anodes with high volumetric and gravimetric capacities, high rate performance, and long cycling life. Pairing with a commercial cathode material LiNiMnCoO, full cells exhibit a gravimetric and volumetric energy density of 590 W h Kg and 1,252 W h L, respectively, the latter of which doubles that of the cell based on graphite anodes. This work provides an effective route towards lithium-ion batteries with high energy density for a broad range of applications.
受微电子尺寸以及电动汽车空间的限制，对具有高体积能量密度的锂离子电池有巨大需求。然而，目前的锂离子电池采用振实密度和重量容量较低的石墨基负极，导致体积性能指标较差。在此，通过将金属锡纳米颗粒封装在机械性能强大的石墨烯管中，我们展示了具有高体积和重量容量、高倍率性能以及长循环寿命的锡负极。与商用正极材料LiNiMnCoO配对，全电池的重量能量密度和体积能量密度分别为590 W h Kg和1252 W h L，后者是基于石墨负极的电池的两倍。这项工作为广泛应用的高能量密度锂离子电池提供了一条有效途径。
