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首页> 外文期刊>RSC Advances >CoxP compounds: electrochemical conversion/partial recombination reaction and partially disproportionated nanocomposite for Li-ion battery anodes
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CoxP compounds: electrochemical conversion/partial recombination reaction and partially disproportionated nanocomposite for Li-ion battery anodes

机译：CoxP化合物：用于锂离子电池阳极的电化学转化/部分重组反应和部分歧化的纳米复合材料

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摘要

CoxP binary compounds, CoP and Co2P, were synthesized using simple solid-state synthetic routes, and their potential as anode materials for Li-ion batteries was investigated. Electrochemical Li reactivity was possible on the CoP electrode, whereas the Co2P electrode did not react with Li. The electrochemically driven partial recombination reaction of the CoP electrode was thoroughly demonstrated using ex situ X-ray diffraction and extended X-ray absorption fine structure analyses. To enhance the electrochemical performances of CoP, its carbon-modified nanocomposite was prepared. The nanocomposite consisted of well-dispersed CoP (active with Li) and Co2P (inactive with Li) nanocrystallites, as well as amorphous P within the amorphous carbon matrix. The partially disproportionated CoP/C nanocomposite electrode exhibited good electrochemical performance with a high initial charge capacity of 531 mA h g (-1) (or 855 mA h cm (-3)), a cycling durability of 407 mA h g (-1) (or 655 mA h cm (-3)) over 200 cycles, a good initial coulombic efficiency of ca. 75%, and a fast rate capability (2C: 435 mA h g (-1), 3C: 410 mA h g (-1)).
机译：使用简单的固态合成路线合成了CoxP二元化合物CoP和Co2P，并研究了它们作为锂离子电池负极材料的潜力。 CoP电极上可能发生电化学Li反应，而Co2P电极不与Li反应。使用异位X射线衍射和扩展的X射线吸收精细结构分析充分证明了CoP电极的电化学驱动部分重组反应。为了提高CoP的电化学性能，制备了其碳改性的纳米复合材料。纳米复合材料由分散良好的CoP（对Li起作用）和Co2P（对Li不起活性）纳米晶体以及无定形碳基质中的无定形P组成。部分歧化的CoP / C纳米复合电极表现出良好的电化学性能，具有531 mA hg（-1）（或855 mA h cm（-3））的高初始充电容量，407 mA hg（-1）的循环耐久性（或655 mA h cm（-3））超过200个周期，初始库仑效率约为。 75％和快速速率能力（2C：435 mA h g（-1），3C：410 mA h g（-1））。

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