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 LiNi 0.6 Mn 0.2 Co 0.2 O 2 , full cells exhibit a gravimetric and volumetric energy density of 590?W?h Kg -1 and 1,252?W?h L -1 , 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.
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机译：受微电子的大小的限制，以及电动车辆的空间，对具有高容量能量密度的锂离子电池有巨大要求。然而，目前的锂离子电池采用基于石墨的阳极，具有低振动密度和重量容量，导致容积性能差。这里，通过在机械鲁棒石墨烯管中封装金属锡的纳米颗粒，我们展示了具有高容量和重量的锡阳极，高速性能和长循环寿命。与商业阴极材料LINI 0.6mN 0.2 CO 0.2 O 2，全细胞分别表现出重量和体积能量，分别为590Ω·H kg -1和1,252？w≤h-1，后者基于石墨阳极的细胞。这项工作为具有广泛应用的高能量密度提供了有效的锂离子电池途径。
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