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| 1 | NaV6O15:A promising cathode material for insertion/extraction of Mg^2+with excellent cycling performance显示文摘The rechargeable magnesium batteries(RMBs)are getting more and more attention because of their high-energy density,high-security and low-cost.Nevertheless,the high charge density of Mg^2+makes the diffusion of Mg2+in the conventional cathodes very slow,resulting in a lack of appropriate electrode materials for RMBs.In this work,we enlarge the layer spacing of V2Os by introducing Na^2+in the crystal structure to promote the diffusion kinetics of Mg^2+.The NaVeO15(NVO)synthesized by a facile method is studied as a cathode material for RMBs with the anhydrous pure Mg^2+electrolyte.As a result,the NVO not only exhibits high discharge capacity(119.2 mAh:g^-1 after 100 cycles at the current density of 20 mA:g^-1)and working voltage(above 1.6 V vs.Mg^2+/Mg),but also expresses good rate capability.Besides,the eX-situ characterizations results reveal that the Mg^2+storage mechanism in NVO is based on the intercalation and deintercalation.The density functional theory(DFT)calculation results further indicate that Mg^2+tends to occupy the semi-occupied sites of Na^+in the NVO.Moreover,the galvanostatic intermittent titration technique(GITT)demonstrates that NVO electrode has the fast diffusion kinetics of Mg^2+during discharge process ranging from 7.55×10^-13 to2.41×10^-11 cm^2·s^-1.Our work proves that the NVO is a potential cathode material for RMBs. | Dongzheng Wu Jing Zeng Haiming Hua Junnan Wu Yang Yang Jinbao Zhao | 2020 | Nano Research2020，13，2： | 2 |
| 2 | 聚酰亚胺正极材料在锂离子电池中的研究进展显示文摘目前,锂离子电池已经广泛应用于电动车、电子产品和各种大型储能设备中。有机正极材料尤其是羰基类化合物,由于其具有理论容量高、环境可持续性、结构多样性且资源丰富等优点,有望成为锂离子电池无机正极材料的替代品。其中,以聚酰亚胺为代表的羰基类化合物作为电池正极材料因其电化学活性高、机械性能优异且热稳定性良好等优势得到了研究者的青睐。本文介绍了有机正极材料的分类,着重对聚酰亚胺材料的充放电机制、合成方法、改性研究以及近年来在锂离子电池正极材料中的应用作出了详细的阐述。最后,对聚酰亚胺的分子设计以及开发柔性电极等方向的发展前景进行了展望。 | 李阿香 孙禹 张望清 | 2022 | 离子交换与吸附2022，38，2： | 1 |
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