Composite Li metal anode with vertical graphene host for high performance Li-S batteries
Composite Li metal anode with vertical graphene host for high performance Li-S batteries
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DOI：
10.1016/j.jpowsour.2017.10.057
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发表时间：
2018-01
影响因子：
9.2
通讯作者：
Y. Zhang;Sufu Liu;X. Wang;Y. Zhong;X. Xia;J. Wu;J. Tu
中科院分区：
文献类型：
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作者：
Y. Zhang;Sufu Liu;X. Wang;Y. Zhong;X. Xia;J. Wu;J. Tu
锂金属负极的高效稳定运行已成为下一代高能量密度存储系统的关键因素。这里采用垂直石墨烯(VG)阵列作为高性能锂金属电池的支架结构。采用熔融注入法将锂包覆在VG支架结构中，并通过磁控溅射在阵列表面涂覆亲锂硅层以辅助熔融注塑过程。多孔支架结构可以显著控制锂的体积膨胀和抑制枝晶锂的形成，从而使锂复合负极具有优异的电化学性能。此外，具有复合负极的Li-S全电池表现出更好的循环可逆性。
Efficient and stable operation of a lithium metal anode has become the enabling factor for next-generation high energy density storage system. Here, vertical graphene (VG) arrays are used as the scaffold structure for high performance Li metal batteries. The melt infusion method is employed to encapsulate Li inside the VG scaffold structure, and the lithiophilic Si layer is coated onto the array surface by magnetron sputtering to assist this melt-infusion process. The porous scaffold structure can control the volume expansion and inhibit the formation of dendritic lithium significantly, leading to the excellent electrochemical performance of the Li composite anode. In addition, the Li-S full batteries with the composite anode display enhanced cycling reversibility.