Beijing Key Laboratory of Energy Nanomaterials, Advanced Technology &Materials Co., Ltd, China Iron &steel Research Institute Group, Beijing 100081, P.R. China.
State Key Laboratory of Material Processing and Die &Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, P.R. China.
Sci Rep. 2017 Feb 27;7:43582. doi: 10.1038/srep43582.
Recently, metal phosphides have been investigated as potential anode materials because of higher specific capacity compared with those of carbonaceous materials. However, the rapid capacity fade upon cycling leads to poor durability and short cycle life, which cannot meet the need of lithium-ion batteries with high energy density. Herein, we report a layer-structured GeP/C nanocomposite anode material with high performance prepared by a facial and large-scale ball milling method via in-situ mechanical reaction. The P-O-C bonds are formed in the composite, leading to close contact between GeP and carbon. As a result, the GeP/C anode displays excellent lithium storage performance with a high reversible capacity up to 1109 mA h g after 130 cycles at a current density of 0.1 A g. Even at high current densities of 2 and 5 A g, the reversible capacities are still as high as 590 and 425 mA h g, respectively. This suggests that the GeP/C composite is promising to achieve high-energy lithium-ion batteries and the mechanical milling is an efficient method to fabricate such composite electrode materials especially for large-scale application.
最近，金属磷化物作为潜在的阳极材料得到了研究，因为它们的比容量比碳材料高。然而，在循环过程中容量迅速衰减导致了较差的循环寿命和较短的循环寿命，无法满足具有高能量密度的锂离子电池的需求。在此，我们报道了一种通过简单、大规模的球磨方法，通过原位机械反应制备的具有高性能的层状 GeP/C 纳米复合材料。在复合材料中形成了 P-O-C 键，使 GeP 与碳紧密接触。结果，GeP/C 阳极在电流密度为 0.1 A g 时经过 130 次循环后，具有高达 1109 mA h g 的可逆容量，表现出优异的锂存储性能。即使在高电流密度为 2 和 5 A g 时，可逆容量仍分别高达 590 和 425 mA h g。这表明 GeP/C 复合材料有望实现高能锂离子电池，机械球磨是制备这种复合电极材料的有效方法，特别是对于大规模应用。
