1D nanostructured sodium vanadium oxide as a novel anode material for aqueous sodium ion batteries
1D nanostructured sodium vanadium oxide as a novel anode material for aqueous sodium ion batteries
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DOI：
10.1016/j.nanoen.2013.12.014
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发表时间：
2014-03-01
期刊：
影响因子：
17.6
通讯作者：
Shang, Y.
中科院分区：
文献类型：
--
作者：
Deng, C.;Zhang, S.;Shang, Y.
一维纳米结构的钠钒氧化物（Na 2 V6 O 16·nH（2）O）是一种新型的钠离子电池负极材料。采用简单的水热法制备了晶体沿沿着（010）方向生长的直纳米带束。在每个束中，大多数纳米带沿沿着相同的方向排列。钒酸钠水合物具有层状结构，钠离子位于层间空隙。本文研究了Na（2）V（6）O（16.）nH（2）O的数量级为10（-14）cm S-1。在恒电流循环时，放电/充电容量在最初的几个循环中迅速衰减。非原位XRD分析表明，这种快速的容量衰减可以归因于主要发生在首次放电中的不可逆相变。以Na 2 V6 O 16 nH 2 O为阳极，Na0.44MnO2为阴极，制备了全水溶液钠离子电池。虽然其充电容量在最初的几个循环中迅速衰减并在随后的循环中稳定，但其放电容量在循环时相对稳定。(C)2014爱思唯尔有限公司版权所有。
1D nanostructured sodium vanadium oxide, i.e. Na2V6O16.nH(2)O, was introduced as a novel anode material for aqueous sodium ion batteries. A simple hydrothermal method is employed to prepare bundles of straight nanobelts whose crystals grow along the (010) direction. In each bundle, most nanobelts are aligned along the same direction. Sodium vanadium oxide hydrate has a layered structure, and that sodium ions are located at the interstices between layers. The solid-state diffusion coefficient of sodium ion in the bulk of Na(2)V(6)O(16.)nH(2)O is in the order of magnitude of 10(-14) cm S-1. The discharge/charge capacity fades quickly in the initial few cycles upon galvanostatic cycling. It is revealed by ex-situ XRD analyses that this fast capacity fading can be attributed to the irreversible phase transition which mainly occurs in the first discharge. A full aqueous sodium ion battery was built using Na2V6O16 nH(2)O as anode and Na0.44MnO2 as cathode. Although its charge capacity fades quickly in the initial few cycles and stabilizes in the following cycles, its discharge capacity is comparatively stable upon cycling. (C) 2014 Elsevier Ltd. All rights reserved.