纳米花
阳极
材料科学
异质结
离子
化学工程
纳米技术
分析化学(期刊)
光电子学
化学
纳米结构
电极
物理化学
色谱法
工程类
有机化学
作者
Shengkai Li,Shangshang Zhang,Haiyan Zhang,Zhenjiang Liu,Changsheng Yang,Yan Wang,Baoshan Wan,Daofeng Wen
标识
DOI:10.1016/j.electacta.2022.141181
摘要
Transition metal selenides with good economy and high theoretical capacity are the most attractive anode materials for sodium-ion batteries (SIBs). However, the severe volume expansion during sodiumization/desodiumization still hinders the wide application of this material. Nano heterojunction materials with lattice distortion not only improve the thermal stability and reaction kinetics, but also the contact area between active materials and electrolyte is increased to enhance the cycle and rate. Herein, three-dimensional (3D) nanoflower-like Cu 2-x Se-MoSe 2 (CMSe) heterojunction is successfully prepared through a facile co-precipitation and hydrothermal method, the prepared 3D CMSe heterojunction anode for SIBs exhibits a high reversible capacity of 549.1 mAh g − 1 over 100 cycles at 0.2 A g − 1 , superior rate capability of 350.59 mAh g − 1 at 20 A g − 1 , and excellent cycling stability (335 mAh g − 1 at 2.0 A g − 1 over 4000 loops). The excellent sodium storage performance can be ascribed to its 3D nanoheterojunction structural features, which can enhance the contact area with electrolyte, buffer volume changes, improve its structural stability during cycling. In addition, the deep reaction mechanism is sufficiently explored by means of ex situ XRD and HRTEM. When further coupled with Na 3 V 2 (PO 4 ) 3 cathode in sodium-ion full cells, it also delivers excellent electrochemical performance. Therefore, 3D CMSe heterojunction is promising anode materials for SIBs.
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