Co2P: A facile solid state synthesis and its applications in alkaline rechargeable batteries

Co2P: A facile solid state synthesis and its applications in alkaline rechargeable batteries
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Co2P:一种简便的固态合成及其在碱性充电电池中的应用

DOI:
10.1016/j.jallcom.2011.09.029
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发表时间:
2012-01
影响因子:
6.2
通讯作者:
Yuan, Huatang
Yuan, Huatang
中科院分区:
材料科学2区
文献类型:
--
作者:
Liu, Guang;Si, Yuchang;Wang, Yijing;Yuan, Huatang

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Co2P晶体是通过简单的固相反应成功合成的。能量色散 X 射线光谱 (EDS) 结果表明 Co 与 P 的摩尔比为 0.6686–0.3314,证实了 Co2P 的化学计量比。恒电流充放电测试表明,Co2P作为碱性充电电池负极材料,具有高达223.5mAhg−1的高最大放电容量(Cmax)和优异的循环性能,在300次循环中容量保持率为97.9%(C300/Cmax)。完全充电/放电过程中的循环伏安法 (CV) 和 XRD 测试证实了 Co(OH)2 和 Co 之间由 Co2P 转化产生的准可逆氧化还原机制。同时产生的P在整个过程中起着重要作用——随着电解液中的反应和溶解,它在Co2P体中带来许多新的空隙,扩大了活性材料和电解液之间的接触面积,使电化学过程变得更容易和更快。
The Co2P crystals are successfully synthesized by a facile solid state reaction. Energy dispersive X-ray spectrum (EDS) results indicate a mol ratio of 0.6686–0.3314 for Co to P, confirming the stoichiometric ratio of Co2P. Galvanostatic charge/discharge tests show that Co2P exhibits a high maximum discharge capacity (Cmax) of 223.5mAhg−1and excellent cyclic properties with capacity retention of 97.9% (C300/Cmax) in the 300th cycle as an anode material in alkaline rechargeable batteries. Cyclic voltammetry (CV) and XRD tests during full charge/discharge processes confirm a quasi-reversible redox mechanism between Co(OH)2and Co resulting from the conversion of Co2P. The simultaneously produced P plays an important role in the whole process – with the reaction and dissolution in the electrolyte, it brings many new interspaces in Co2P body to enlarge the contact area between the active material and the electrolyte, and make the electrochemical process easier and faster.
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