ZnSe nanoparticles combined with uniform 3D interconnected MWCNTs conductive network as high-rate and freeze-resistant anode materials for sodium-ion batteries

Zn–O–C bonds for efficient electron/ion bridging in ZnSe/C composites boosting the sodium-ion storage

“…Among them, Zn–Se bonds are indexed to the peak at 56.2 eV. 58,63,64 These above analyses preliminarily confirm the successful synthesis of ZnSe/C composites. Zn–O–C bonds served as a bridge that would provide a new channel for fast electron/ion transport, and improve the dynamics of electrochemical reactions.…”

“…3j) shows the lattice of [111], [220], and [311]. 63,68 Impressively, these results further demonstrate that ZnSe nanoparticles are successfully embedded in the carbon matrix. Among them, the carbon network is conducive to space limitations.…”

“…3i shows that the lattice spacings are 0.328 and 0.200 nm, corresponding to [111] and [220] planes, respectively (ZnSe, PDF# 34-1463). 63 The SAED image (Fig. 3j) shows the lattice of [111], [220], and [311].…”

“…According to the formula (3): 69,82,83 I ( v ) = k 1 v + k 2 v 1/2 in which k 1 v and k 2 v 1/2 stand for the surface-controlled pseudo-capacitive behavior and diffusion-controlled process, respectively. 61,63 The capacity contribution rate of pseudo-capacitance behavior is evaluated. As shown in Fig.…”

Research progress of metal selenides anode materials for sodium-ion batteries

“…ZnSe 的储钠反应结合了转化反应以及合金化反 应机制，具有高理论容量，合适的充/放电平台，同 时具有低毒性的特点， 因此被认为是一种很有前景的 负极材料。然而，低本征电导率及大的体积变化仍旧 是制约其循环稳定性及倍率性能的关键。Zhou 等 [65] 通过一步水热法合成了 ZnSe/多壁碳纳米管复合材料 (MWCNTs) ，均匀互连的三维 MWCNTs 网络可以 有效提升材料电导率、离子扩散速率以及结构稳定 性，同时 ZnSe 纳米颗粒与 MWCNTs 之间的协同效 应可以进一步促进钠离子的存储过程， 因此复合材料 可 以 实 现 优 异 的 电 化 学 性 能 。 在 室 温 下 ， ZnSe/MWCNTs 可以表现出优异的比容量和倍率性 能，且在 4 A g -1 下进行 300 次循环后，其容量保持 率仍为 93%。即使在低温 (-10°C) 下也可以表现出 良好的长期循环稳定性，在 1 A g -1 下循环 600 次后 为 246.7 mAh g -1 。Dong 等 [66] 制备了氮掺杂碳包覆的 柳叶状 ZnSe 复合材料(ZnSe@NC) ，独特的结构增 加了储钠活性位点并促进电子/离子的快速传输，因 此，ZnSe@NC 具有出色的电化学性能(0.1 A g -1 下 440.3 mAh g -1 以及 10 A g -1 下 144.4 mAh g -1 的高倍率 性能) 。Lu 等 [67]…”