Zamani Navid, Modarresi-Alam Ali Reza, Noroozifar Meissam
Department of Chemistry, University of Sistan and Baluchestan, Zahedan 9816745785, Iran.
ACS Omega. 2018 Apr 26;3(4):4620-4630. doi: 10.1021/acsomega.7b01153. eCollection 2018 Apr 30.
The present study reports a novel red phosphorus (RP)/CoO-CuO hybrid as a high-performance anode material for lithium ion battery that was successfully synthesized by simple sol gel method and followed by facile ball milling of red phosphorus. Herein, we outstandingly improved practical application of RP anode (with its natural insulation property and rapid capacity decay in during the lithiation process) in lithium-ion batteries (LIBs) by confining nanosized amorphous RP into the CoO-CuO nanoparticle while RP can improve the electrochemical capacity returning and increased capacity of composite in high current density. This bonding can help maintain electrical contact, prevent to escape RP from the electrode and confirm the solid electrolyte interphase upon the large volume change of RP during cycling. As a result, by judicious usage of components in the RP/CoO-CuO hybrid nanostructured anode was achieved an initial Coulombic efficiency of 99.8% at a current density of 50 mA g and an enhanced cycling stability (683.63 and 470.11 mAh g after 60 cycles at a density of 0.1 and 1 A g) with interesting cycling capacity at high current density of 3 Ag (333.81 mAh g). Moreover, the composite electrode can still deliver a specific capacity of about 97.4% of initial capacity after cycling at high rates and returning to the initial current density of 0.1 A g.
本研究报道了一种新型的红磷（RP）/CoO-CuO复合材料，作为锂离子电池的高性能负极材料，通过简单的溶胶-凝胶法成功合成，随后对红磷进行了简便的球磨处理。在此，我们通过将纳米尺寸的非晶态红磷限制在CoO-CuO纳米颗粒中，显著改善了红磷负极（因其天然绝缘性和在锂化过程中快速的容量衰减）在锂离子电池（LIBs）中的实际应用，同时红磷可以提高复合电极在高电流密度下的电化学容量恢复和容量增加。这种结合有助于保持电接触，防止红磷从电极中逸出，并在循环过程中红磷发生大体积变化时确认固体电解质界面。结果，通过合理使用RP/CoO-CuO混合纳米结构负极中的组分，在50 mA g的电流密度下实现了99.8%的初始库仑效率，并提高了循环稳定性（在0.1和1 A g的电流密度下循环60次后分别为683.63和470.11 mAh g），在3 A g的高电流密度下具有有趣的循环容量（333.81 mAh g）。此外，复合电极在高倍率循环后回到0.1 A g的初始电流密度时，仍能提供约为初始容量97.4%的比容量。
