Formation of Stable Phosphorus-Carbon Bond for Enhanced Performance in Black Phosphorus Nanoparticle-Graphite Composite Battery Anodes
Formation of Stable Phosphorus-Carbon Bond for Enhanced Performance in Black Phosphorus Nanoparticle-Graphite Composite Battery Anodes
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形成稳定的磷-碳键以增强黑磷纳米粒子-石墨复合电池阳极的性能
DOI：
10.1021/nl501617j
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发表时间：
2014-08-01
期刊：
影响因子：
10.8
通讯作者：
Cui, Yi
中科院分区：
文献类型：
--
作者：
Sun, Jie;Zheng, Guangyuan;Cui, Yi
高容量电池电极材料引起了极大的研究关注。磷作为低成本丰富的材料的高理论特异性容量为2596 mAh/g，其大部分容量在0.4-1.2 V的排放势范围内，适用于阳极。尽管许多研究进展表明其他高容量阳极，例如SI，GE，SN和SNO2，但尽管具有很高的理论能力，但对于磷阳极的研究只有少数研究。磷阳极的成功应用受到快速衰减的障碍，主要是由于静脉静脉内大量变化（约300％）引起的，从而导致电气接触的丧失。使用磷的传导同素原料，“黑磷”作为起始材料，在这里，我们通过机械化学反应在高能量机械铣削过程中通过机械化学反应制造了黑磷纳米磷脂的复合材料。该过程产生磷碳键，在锂插入/提取过程中稳定，维持磷和碳之间的良好电连接。我们在0.2 C时证明了高初始排放能力为2786 mAh.g（-1），并且具有80％能力保留的100个周期的出色循环寿命。高特异性排放能力以快速C速率（分别为2270、1750、1500和1240 mAh.g（-1）分别为C/5、1、2和4.5 C）。
High specific capacity battery electrode materials have attracted great research attention. Phosphorus as a low-cost abundant material has a high theoretical specific capacity of 2596 mAh/g with most of its capacity at the discharge potential range of 0.4-1.2 V, suitable as anodes. Although numerous research progress have shown other high capacity anodes such as Si, Ge, Sn, and SnO2, there are only a few studies on phosphorus anodes despite its high theoretical capacity. Successful applications of phosphorus anodes have been impeded by rapid capacity fading, mainly caused by large volume change (around 300%) upon lithiation and thus loss of electrical contact. Using the conducting allotrope of phosphorus, "black phosphorus" as starting materials, here we fabricated composites of black phosphorus nanopartide-graphite by mechanochemical reaction in a high energy mechanical milling process. This process produces phosphorus-carbon bonds, which are stable during lithium insertion/extraction, maintaining excellent electrical connection between phosphorus and carbon. We demonstrated high initial discharge capacity of 2786 mAh.g(-1) at 0.2 C and an excellent cycle life of 100 cycles with 80% capacity retention. High specific discharge capacities are maintained at fast C rates (2270, 1750, 1500, and 1240 mAh.g(-1) at C/5, 1, 2, and 4.5 C, respectively).